/*jshint -W030 */
define([
        "dojo/Evented",
        "dojo/_base/Deferred",
        "dojo/promise/all",
        "dojo/_base/declare",
        "dojo/_base/array",
        "dojo/dom-attr",
        "dojo/dom-style",
        "dojo/query",
        "esri/config",
        "esri/layers/GraphicsLayer",
        "esri/graphic",
        "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol",
        "esri/symbols/SimpleFillSymbol",
        "esri/urlUtils"],
    function (Evented, Deferred, all, declare, array, domAttr, domStyle, query,
              esriConfig, GraphicsLayer, Graphic, SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol, urlUtils) {
        "use strict";
        return declare("O.esri.Edit.OfflineFeaturesManager", [Evented],
            {
                _onlineStatus: "online",
                _featureLayers: {},
                _editStore: new O.esri.Edit.EditStore(),

                ONLINE: "online",				// all edits will directly go to the server
                OFFLINE: "offline",             // edits will be enqueued
                RECONNECTING: "reconnecting",   // sending stored edits to the server
                attachmentsStore: null,         // indexedDB for storing attachments
                proxyPath: null,                // by default we use CORS and therefore proxyPath is null

                // Database properties
                DB_NAME: "features_store",      // Sets the database name.
                DB_OBJECTSTORE_NAME: "features",// Represents an object store that allows access to a set of data in the IndexedDB database
                DB_UID: "objectid",        // Set this based on the unique identifier is set up in the feature service

                ATTACHMENTS_DB_NAME: "attachments_store", //Sets attachments database name
                ATTACHMENTS_DB_OBJECTSTORE_NAME: "attachments",
                // NOTE: attachments don't have the same issues as Graphics as related to UIDs.
                // You can manually create a graphic, but it would be very rare for someone to
                // manually create an attachment. So, we don't provide a public property for
                // the attachments database UID.

                // manager emits event when...
                events: {
                    EDITS_SENT: "edits-sent",           // ...whenever any edit is actually sent to the server
                    EDITS_ENQUEUED: "edits-enqueued",   // ...when an edit is enqueued (and not sent to the server)
                    EDITS_ENQUEUED_ERROR: "edits-enqueued-error", // ...when there is an error during the queing process
                    EDITS_SENT_ERROR: "edits-sent-error",         // ...there was a problem with one or more edits!
                    ALL_EDITS_SENT: "all-edits-sent",   // ...after going online and there are no pending edits in the queue
                    ATTACHMENT_ENQUEUED: "attachment-enqueued",
                    ATTACHMENTS_SENT: "attachments-sent"
                },

                /**
                 * Need to call this method only if you want to support offline attachments
                 * it is optional
                 * @param callback(success)
                 * @returns void
                 */
                initAttachments: function (callback) {
                    callback = callback || function (success) {
                        console.log("attachments inited ", success ? "ok" : "failed");
                    };

                    if (!this._checkFileAPIs()) {
                        return callback(false, "File APIs not supported");
                    }

                    try {
                        this.attachmentsStore = new O.esri.Edit.AttachmentsStore();
                        this.attachmentsStore.dbName = this.ATTACHMENTS_DB_NAME;
                        this.attachmentsStore.objectStoreName = this.ATTACHMENTS_DB_OBJECTSTORE_NAME;

                        if (/*false &&*/ this.attachmentsStore.isSupported()) {
                            this.attachmentsStore.init(callback);
                        }
                        else {
                            return callback(false, "indexedDB not supported");
                        }
                    }
                    catch (err) {
                        console.log("problem!  " + err.toString());
                    }
                },

                /**
                 * Overrides a feature layer. Call this AFTER the FeatureLayer's 'update-end' event.
                 * IMPORTANT: If dataStore is specified it will be saved to the database. Any complex
                 * objects such as [esri.Graphic] will need to be serialized or you will get an IndexedDB error.
                 * @param layer
                 * @param updateEndEvent The FeatureLayer's update-end event object
                 * @param callback {true, null} or {false, errorString} Traps whether or not the database initialized
                 * @param dataStore Optional configuration Object. Added @ v2.5. There is only one reserved object key and that is "id".
                 * Use this option to store featureLayerJSON and any other configuration information you'll need access to after
                 * a full offline browser restart.
                 * @returns deferred
                 */
                extend: function (layer, callback, dataStore) {
                    var self = this;

                    // NOTE: At v2.6.1 we've discovered that not all feature layers support objectIdField.
                    // However, we want to try to be consistent here with how the library is managing Ids.
                    // So, we force the layer.objectIdField to DB_UID. This should be consistent with
                    // how esri.Graphics assign a unique ID to a graphic. If it is not, then this
                    // library will break and we'll have to re-architect how we manage UIDs.
                    layer.objectIdField = this.DB_UID;

                    // Initialize the database as well as set offline data.
                    this._initializeDB(dataStore,callback);

                    // we keep track of the FeatureLayer object
                    this._featureLayers[layer.url] = layer;

                    // replace the applyEdits() method
                    layer._applyEdits = layer.applyEdits;


                    // attachments
                    layer._addAttachment = layer.addAttachment;
                    layer._queryAttachmentInfos = layer.queryAttachmentInfos;
                    layer._deleteAttachments = layer.deleteAttachments;
                    layer._updateAttachment = layer.updateAttachment;

                    /*
                     operations supported offline:
                     1. add a new attachment to an existing feature (DONE)
                     2. add a new attachment to a new feature (DONE)
                     3. remove an attachment that is already in the server... (DONE)
                     4. remove an attachment that is not in the server yet (DONE)
                     5. update an existing attachment to an existing feature (DONE)
                     6. update a new attachment (NOT YET)

                     concerns:
                     - manage the relationship between offline features and attachments: what if the user wants to add
                     an attachment to a feature that is still offline? we need to keep track of objectids so that when
                     the feature is sent to the server and receives a final objectid we replace the temporary negative id
                     by its final objectid (DONE)
                     - what if the user deletes an offline feature that had offline attachments? we need to discard the attachment  (DONE)

                     pending tasks:
                     - check for hasAttachments attribute in the FeatureLayer (NOT YET)
                     */

                    //
                    // attachments
                    //
                    layer.queryAttachmentInfos = function (objectId, callback, errback) {
                        if (self.getOnlineStatus() === self.ONLINE) {
                            var def = this._queryAttachmentInfos(objectId,
                                function () {
                                    console.log(arguments);
                                    self.emit(self.events.ATTACHMENTS_INFO, arguments);
                                    callback && callback.apply(this, arguments);
                                },
                                errback);
                            return def;
                        }

                        if (!self.attachmentsStore) {
                            console.log("in order to support attachments you need to call initAttachments() method of offlineFeaturesManager");
                            return;
                        }

                        // will only return LOCAL attachments
                        var deferred = new Deferred();
                        self.attachmentsStore.getAttachmentsByFeatureId(this.url, objectId, function (attachments) {
                            callback && callback(attachments);
                            deferred.resolve(attachments);
                        });
                        return deferred;
                    };

                    layer.addAttachment = function (objectId, formNode, callback, errback) {

                        if (self.getOnlineStatus() === self.ONLINE) {
                            return this._addAttachment(objectId, formNode,
                                function () {
                                    console.log(arguments);
                                    self.emit(self.events.ATTACHMENTS_SENT, arguments);
                                    callback && callback.apply(this, arguments);
                                },
                                function (err) {
                                    console.log("addAttachment: " + err);
                                    errback && errback.apply(this, arguments);
                                }
                            );
                        }

                        if (!self.attachmentsStore) {
                            console.error("in order to support attachments you need to call initAttachments() method of offlineFeaturesManager");
                            return;
                        }

                        var files = this._getFilesFromForm(formNode);
                        var file = files[0]; // addAttachment can only add one file, so the rest -if any- are ignored

                        var deferred = new Deferred();
                        var attachmentId = this._getNextTempId();
                        self.attachmentsStore.store(this.url, attachmentId, objectId, file,self.attachmentsStore.TYPE.ADD, function (success, newAttachment) {
                            var returnValue = {attachmentId: attachmentId, objectId: objectId, success: success};
                            if (success) {
                                self.emit(self.events.ATTACHMENT_ENQUEUED, returnValue);
                                callback && callback(returnValue);
                                deferred.resolve(returnValue);

                                // replace the default URL that is set by attachmentEditor with the local file URL
                                var attachmentUrl = this._url.path + "/" + objectId + "/attachments/" + attachmentId;
                                var attachmentElement = query("[href=" + attachmentUrl + "]");
                                attachmentElement.attr("href", newAttachment.url);
                            }
                            else {
                                returnValue.error = "can't store attachment";
                                errback && errback(returnValue);
                                deferred.reject(returnValue);
                            }
                        }.bind(this));

                        return deferred;
                    };

                    layer.updateAttachment = function(objectId, attachmentId, formNode, callback, errback) {
                        if (self.getOnlineStatus() === self.ONLINE) {
                            return this._updateAttachment(objectId, attachmentId, formNode,
                                function () {
                                    callback && callback.apply(this, arguments);
                                },
                                function (err) {
                                    console.log("updateAttachment: " + err);
                                    errback && errback.apply(this, arguments);
                                });
                            //return def;
                        }

                        if (!self.attachmentsStore) {
                            console.error("in order to support attachments you need to call initAttachments() method of offlineFeaturesManager");
                            return;
                        }

                        var files = this._getFilesFromForm(formNode);
                        var file = files[0]; // addAttachment can only add one file, so the rest -if any- are ignored

                        var deferred = new Deferred();

                        self.attachmentsStore.store(this.url, attachmentId, objectId, file, self.attachmentsStore.TYPE.UPDATE, function (success, newAttachment) {
                            var returnValue = {attachmentId: attachmentId, objectId: objectId, success: success};
                            if (success) {
                                self.emit(self.events.ATTACHMENT_ENQUEUED, returnValue);
                                callback && callback(returnValue);
                                deferred.resolve(returnValue);

                                // replace the default URL that is set by attachmentEditor with the local file URL
                                var attachmentUrl = this._url.path + "/" + objectId + "/attachments/" + attachmentId;
                                var attachmentElement = query("[href=" + attachmentUrl + "]");
                                attachmentElement.attr("href", newAttachment.url);
                            }
                            else {
                                returnValue.error = "layer.updateAttachment::attachmentStore can't store attachment";
                                errback && errback(returnValue);
                                deferred.reject(returnValue);
                            }
                        }.bind(this));

                        return deferred;
                    };

                    layer.deleteAttachments = function (objectId, attachmentsIds, callback, errback) {
                        if (self.getOnlineStatus() === self.ONLINE) {
                            var def = this._deleteAttachments(objectId, attachmentsIds,
                                function () {
                                    callback && callback.apply(this, arguments);
                                },
                                function (err) {
                                    console.log("deleteAttachments: " + err);
                                    errback && errback.apply(this, arguments);
                                });
                            return def;
                        }

                        if (!self.attachmentsStore) {
                            console.log("in order to support attachments you need to call initAttachments() method of offlineFeaturesManager");
                            return;
                        }

                        // case 1.- it is a new attachment
                        // case 2.- it is an already existing attachment

                        // asynchronously delete each of the attachments
                        var promises = [];
                        attachmentsIds.forEach(function (attachmentId) {
                            attachmentId = parseInt(attachmentId, 10); // to number

                            var deferred = new Deferred();

                            // IMPORTANT: If attachmentId < 0 then it's a local/new attachment
                            // and we can simply delete it from the attachmentsStore.
                            // However, if the attachmentId > 0 then we need to store the DELETE
                            // so that it can be processed and sync'd correctly during _uploadAttachments().
                            if(attachmentId < 0) {
                                self.attachmentsStore.delete(attachmentId, function (success) {
                                    var result = {objectId: objectId, attachmentId: attachmentId, success: success};
                                    deferred.resolve(result);
                                });
                            }
                            else {
                                var dummyBlob = new Blob([],{type: "image/png"}); //TO-DO just a placeholder. Need to consider add a null check.
                                self.attachmentsStore.store(this.url, attachmentId, objectId, dummyBlob,self.attachmentsStore.TYPE.DELETE, function (success, newAttachment) {
                                    var returnValue = {attachmentId: attachmentId, objectId: objectId, success: success};
                                    if (success) {
                                        deferred.resolve(returnValue);
                                    }
                                    else {
                                        deferred.reject(returnValue);
                                    }
                                }.bind(this));
                            }
                            //console.assert(attachmentId < 0, "we only support deleting local attachments");
                            promises.push(deferred);
                        }, this);

                        // call callback once all deletes have finished
                        // IMPORTANT: This returns an array!!!
                        var allPromises = all(promises);
                        allPromises.then(function (results) {
                            callback && callback(results);
                        });

                        return allPromises;
                    };

                    //
                    // other functions
                    //

                    /**
                     * Overrides the ArcGIS API for JavaSccript applyEdits() method.
                     * @param adds Creates a new edit entry.
                     * @param updates Updates an existing entry.
                     * @param deletes Deletes an existing entry.
                     * @param callback Called when the operation is complete.
                     * @param errback  An error object is returned if an error occurs
                     * @returns {*} deferred
                     * @event EDITS_ENQUEUED boolean if all edits successfully stored while offline
                     * @event EDITS_ENQUEUED_ERROR string message if there was an error while storing an edit while offline
                     */
                    layer.applyEdits = function (adds, updates, deletes, callback, errback) {
                        // inside this method, 'this' will be the FeatureLayer
                        // and 'self' will be the offlineFeatureLayer object

                        var promises = [];

                        if (self.getOnlineStatus() === self.ONLINE) {
                            var def = this._applyEdits(adds, updates, deletes,
                                function () {
                                    self.emit(self.events.EDITS_SENT, arguments);
                                    callback && callback.apply(this, arguments);
                                },
                                errback);
                            return def;
                        }

                        var deferred1 = new Deferred();
                        var results = {addResults: [], updateResults: [], deleteResults: []};
                        var updatesMap = {};

                        adds = adds || [];
                        adds.forEach(function (addEdit) {
                            var deferred = new Deferred();

                            var objectId = this._getNextTempId();

                            addEdit.attributes[this.objectIdField] = objectId;

                            var thisLayer = this;

                            // We need to run some validation tests against each feature being added.
                            // Adding the same feature multiple times results in the last edit wins. LIFO.
                            this._validateFeature(addEdit,this.url,self._editStore.ADD).then(function(result){
                                console.log("EDIT ADD IS BACK!!! " );

                                if(result.success){
                                    thisLayer._pushValidatedAddFeatureToDB(thisLayer,addEdit,result.operation,results,objectId,deferred);
                                }
                                else{
                                    // If we get here then we deleted an edit that was added offline.
                                    // We also have deleted the phantom graphic.
                                    deferred.resolve(true);
                                }

                            },function(error){
                                console.log("_validateFeature: Unable to validate!");
                                deferred.reject(error);
                            });

                            promises.push(deferred);
                        }, this);

                        updates = updates || [];
                        updates.forEach(function (updateEdit) {
                            var deferred = new Deferred();

                            var objectId = updateEdit.attributes[this.objectIdField];
                            updatesMap[objectId] = updateEdit;

                            var thisLayer = this;

                            // We need to run some validation tests against each feature being updated.
                            // If we have added a feature and we need to update it then we change it's operation type to "add"
                            // and the last edits wins. LIFO.
                            this._validateFeature(updateEdit,this.url,self._editStore.UPDATE).then(function(result){
                                console.log("EDIT UPDATE IS BACK!!! " );

                                if(result.success){
                                    thisLayer._pushValidatedUpdateFeatureToDB(thisLayer,updateEdit,result.operation,results,objectId,deferred);
                                }
                                else{
                                    // If we get here then we deleted an edit that was added offline.
                                    // We also have deleted the phantom graphic.
                                    deferred.resolve(true);
                                }

                            },function(error){
                                console.log("_validateFeature: Unable to validate!");
                                deferred.reject(error);
                            });

                            promises.push(deferred);
                        }, this);

                        deletes = deletes || [];
                        deletes.forEach(function (deleteEdit) {
                            var deferred = new Deferred();

                            var objectId = deleteEdit.attributes[this.objectIdField];

                            var thisLayer = this;

                            // We need to run some validation tests against each feature being deleted.
                            // If we have added a feature and then deleted it in the app then we go ahead
                            // and delete it and its phantom graphic from the database.
                            // NOTE: at this time we don't handle attachments automatically
                            this._validateFeature(deleteEdit,this.url,self._editStore.DELETE).then(function(result){
                                console.log("EDIT DELETE IS BACK!!! " );

                                if(result.success){
                                    thisLayer._pushValidatedDeleteFeatureToDB(thisLayer,deleteEdit,result.operation,results,objectId,deferred);
                                }
                                else{
                                    // If we get here then we deleted an edit that was added offline.
                                    // We also have deleted the phantom graphic.
                                    deferred.resolve(true);
                                }

                            },function(error){
                                console.log("_validateFeature: Unable to validate!");
                                deferred.reject(error);
                            });

                            promises.push(deferred);
                        }, this);

                        all(promises).then(function (r) {
                            // Make sure all edits were successful. If not throw an error.
                            var success = true;
                            var length = r.length;
                            for (var v = 0; v < length; v++) {
                                if (r[v] === false) {
                                    success = false;
                                }
                            }

                            // we already pushed the edits into the database, now we let the FeatureLayer to do the local updating of the layer graphics
                            // EDITS_ENQUEUED = callback(true, edit), and EDITS_ENQUEUED_ERROR = callback(false, /*String */ error)
                            this._editHandler(results, adds, updatesMap, callback, errback, deferred1);
                            success === true ? self.emit(self.events.EDITS_ENQUEUED, results) : self.emit(self.events.EDITS_ENQUEUED_ERROR, results);
                        }.bind(this));

                        return deferred1;

                    }; // layer.applyEdits()
 
                    /**
                     * Converts an array of graphics/features into JSON
                     * @param features
                     * @param updateEndEvent The layer's 'update-end' event
                     * @param callback
                     */
                    layer.convertGraphicLayerToJSON = function (features, updateEndEvent, callback) {
                        var layerDefinition = {};

                        // We want to be consistent, but we've discovered that not all feature layers have an objectIdField
                        if(updateEndEvent.target.hasOwnProperty("objectIdField"))
                        {
                            layerDefinition.objectIdFieldName = updateEndEvent.target.objectIdField;
                        }else {
                            layerDefinition.objectIdFieldName = this.objectIdField;
                        }

                        layerDefinition.globalIdFieldName = updateEndEvent.target.globalIdField;
                        layerDefinition.geometryType = updateEndEvent.target.geometryType;
                        layerDefinition.spatialReference = updateEndEvent.target.spatialReference;
                        layerDefinition.fields = updateEndEvent.target.fields;

                        var length = features.length;
                        var jsonArray = [];
                        for (var i = 0; i < length; i++) {
                            var jsonGraphic = features[i].toJson();
                            jsonArray.push(jsonGraphic);
                            if (i == (length - 1)) {
                                var featureJSON = JSON.stringify(jsonArray);
                                var layerDefJSON = JSON.stringify(layerDefinition);
                                callback(featureJSON, layerDefJSON);
                                break;
                            }
                        }
                    };

                    /**
                     * Retrieves f=json from the feature layer
                     * @param url FeatureLayer's URL
                     * @param callback
                     * @private
                     */
                    layer.getFeatureLayerJSON = function (url, callback) {
                        require(["esri/request"], function (esriRequest) {
                            var request = esriRequest({
                                url: url,
                                content: {f: "json"},
                                handleAs: "json",
                                callbackParamName: "callback"
                            });

                            request.then(function (response) {
                                console.log("Success: ", response);
                                callback(true, response);
                            }, function (error) {
                                console.log("Error: ", error.message);
                                callback(false, error.message);
                            });
                        });
                    };

                    /**
                     * Sets the optional feature layer storage object
                     * @param jsonObject
                     * @param callback
                     */
                    layer.setFeatureLayerJSONDataStore = function(jsonObject, callback){
                        self._editStore.pushFeatureLayerJSON(jsonObject,function(success,error){
                            callback(success,error);
                        });
                    };

                    /**
                     * Retrieves the optional feature layer storage object
                     * @param callback callback(true, object) || callback(false, error)
                     */
                    layer.getFeatureLayerJSONDataStore = function(callback){
                        self._editStore.getFeatureLayerJSON(function(success,message){
                            callback(success,message);
                        });
                    };

                    /**
                     * Sets the phantom layer with new features.
                     * Used to restore PhantomGraphicsLayer after offline restart
                     * @param graphicsArray an array of Graphics
                     */
                    layer.setPhantomLayerGraphics = function (graphicsArray) {
                        var length = graphicsArray.length;

                        if (length > 0) {
                            for (var i = 0; i < length; i++) {
                                var graphic = new Graphic(graphicsArray[i]);
                                this._phantomLayer.add(graphic);
                            }
                        }
                    };

                    /**
                     * Returns the array of graphics from the phantom graphics layer.
                     * This layer identifies features that have been modified
                     * while offline.
                     * @returns {array}
                     */
                    layer.getPhantomLayerGraphics = function (callback) {
                        //return layer._phantomLayer.graphics;
                        var graphics = layer._phantomLayer.graphics;
                        var length = layer._phantomLayer.graphics.length;
                        var jsonArray = [];
                        for (var i = 0; i < length; i++) {
                            var jsonGraphic = graphics[i].toJson();
                            jsonArray.push(jsonGraphic);
                            if (i == (length - 1)) {
                                var graphicsJSON = JSON.stringify(jsonArray);
                                callback(graphicsJSON);
                                break;
                            }
                        }
                    };

                    /**
                     * Returns an array of phantom graphics from the database.
                     * @param callback callback (true, array) or (false, errorString)
                     */
                    layer.getPhantomGraphicsArray = function(callback){
                        self._editStore.getPhantomGraphicsArray(function(array,message){
                            if(message == "end"){
                                callback(true,array);
                            }
                            else{
                                callback(false,message);
                            }
                        });
                    };

                    /**
                     * Returns the approximate size of the attachments database in bytes
                     * @param callback callback({usage}, error) Whereas, the usage Object is {sizeBytes: number, attachmentCount: number}
                     */
                    layer.getAttachmentsUsage = function(callback) {
                        self.attachmentsStore.getUsage(function(usage,error){
                            callback(usage,error);
                        });
                    };

                    /**
                     * Full attachments database reset.
                     * CAUTION! If some attachments weren't successfully sent, then their record
                     * will still exist in the database. If you use this function you
                     * will also delete those records.
                     * @param callback (boolean, error)
                     */
                    layer.resetAttachmentsDatabase = function(callback){
                        self.attachmentsStore.resetAttachmentsQueue(function(result,error){
                            callback(result,error);
                        });
                    };

                    /**
                     * Returns the approximate size of the edits database in bytes
                     * @param callback callback({usage}, error) Whereas, the usage Object is {sizeBytes: number, editCount: number}
                     */
                    layer.getUsage = function(callback){
                        self._editStore.getUsage(function(usage,error){
                            callback(usage,error);
                        });
                    };

                    /**
                     * Full edits database reset.
                     * CAUTION! If some edits weren't successfully sent, then their record
                     * will still exist in the database. If you use this function you
                     * will also delete those records.
                     * @param callback (boolean, error)
                     */
                    layer.resetDatabase = function(callback){
                        self._editStore.resetEditsQueue(function(result,error){
                            callback(result,error);
                        });
                    };

                    /**
                     * Returns the number of edits pending in the database.
                     * @param callback callback( int )
                     */
                    layer.pendingEditsCount = function(callback){
                        self._editStore.pendingEditsCount(function(count){
                            callback(count);
                        });
                    };

                    /**
                     * Create a featureDefinition
                     * @param featureLayer
                     * @param featuresArr
                     * @param geometryType
                     * @param callback
                     */
                    layer.getFeatureDefinition = function (/* Object */ featureLayer, /* Array */ featuresArr, /* String */ geometryType, callback) {

                        var featureDefinition = {
                            "layerDefinition": featureLayer,
                            "featureSet": {
                                "features": featuresArr,
                                "geometryType": geometryType
                            }

                        };

                        callback(featureDefinition);
                    };

                    /**
                     * Returns an iterable array of all edits stored in the database
                     * Each item in the array is an object and contains:
                     * {
                     *    id: "internal ID",
                     *    operation: "add, update or delete",
                     *    layer: "layerURL",
                     *    type: "esri Geometry Type",
                     *    graphic: "esri.Graphic converted to JSON then serialized"
                     * }
                     * @param callback (true, array) or (false, errorString)
                     */
                    layer.getAllEditsArray = function(callback){
                        self._editStore.getAllEditsArray(function(array,message){
                            if(message == "end"){
                                callback(true,array);
                            }
                            else{
                                callback(false,message);
                            }
                        });
                    };

                    /* internal methods */

                    /**
                     * Pushes an DELETE request to the database after it's been validated
                     * @param layer
                     * @param deleteEdit
                     * @param operation
                     * @param resultsArray
                     * @param objectId
                     * @param deferred
                     * @private
                     */
                    layer._pushValidatedDeleteFeatureToDB = function(layer,deleteEdit,operation,resultsArray,objectId,deferred){
                        self._editStore.pushEdit(operation, layer.url, deleteEdit, function (result, error) {

                            if(result){
                                resultsArray.deleteResults.push({success: true, error: null, objectId: objectId});

                                // Use the correct key as set by self.DB_UID
                                var tempIdObject = {};
                                tempIdObject[self.DB_UID] = objectId;

                                var phantomDelete = new Graphic(
                                    deleteEdit.geometry,
                                    self._getPhantomSymbol(deleteEdit.geometry, self._editStore.DELETE),
                                    tempIdObject
                                );

                                layer._phantomLayer.add(phantomDelete);

                                // Add phantom graphic to the database
                                self._editStore.pushPhantomGraphic(phantomDelete, function (result) {
                                    if (!result) {
                                        console.log("There was a problem adding phantom graphic id: " + objectId);
                                    }
                                    console.log("Phantom graphic " + objectId + " added to database as a deletion.");
                                });

                                domAttr.set(phantomDelete.getNode(), "stroke-dasharray", "4,4");
                                domStyle.set(phantomDelete.getNode(), "pointer-events", "none");

                                if (self.attachmentsStore) {
                                    // delete local attachments of this feature, if any... we just launch the delete and don't wait for it to complete
                                    self.attachmentsStore.deleteAttachmentsByFeatureId(layer.url, objectId, function (deletedCount) {
                                        console.log("deleted", deletedCount, "attachments of feature", objectId);
                                    });
                                }
                            }
                            else{
                                // If we can't push edit to database then we don't create a phantom graphic
                                resultsArray.deleteResults.push({success: false, error: error, objectId: objectId});
                            }

                            deferred.resolve(result);
                        });
                    };

                    /**
                     * Pushes an UPDATE request to the database after it's been validated
                     * @param layer
                     * @param updateEdit
                     * @param operation
                     * @param resultsArray
                     * @param objectId
                     * @param deferred
                     * @private
                     */
                    layer._pushValidatedUpdateFeatureToDB = function(layer,updateEdit,operation,resultsArray,objectId,deferred){
                        self._editStore.pushEdit(operation, layer.url, updateEdit, function (result, error) {

                            if(result){
                                resultsArray.updateResults.push({success: true, error: null, objectId: objectId});

                                // Use the correct key as set by self.DB_UID
                                var tempIdObject = {};
                                tempIdObject[self.DB_UID] = objectId;

                                var phantomUpdate = new Graphic(
                                    updateEdit.geometry,
                                    self._getPhantomSymbol(updateEdit.geometry, self._editStore.UPDATE),
                                    tempIdObject
                                );

                                layer._phantomLayer.add(phantomUpdate);

                                // Add phantom graphic to the database
                                self._editStore.pushPhantomGraphic(phantomUpdate, function (result) {
                                    if (!result) {
                                        console.log("There was a problem adding phantom graphic id: " + objectId);
                                    }
                                    console.log("Phantom graphic " + objectId + " added to database as an update.");
                                });

                                domAttr.set(phantomUpdate.getNode(), "stroke-dasharray", "5,2");
                                domStyle.set(phantomUpdate.getNode(), "pointer-events", "none");
                            }
                            else{
                                // If we can't push edit to database then we don't create a phantom graphic
                                resultsArray.updateResults.push({success: false, error: error, objectId: objectId});
                            }

                            deferred.resolve(result);
                        });
                    };

                    /**
                     * Pushes an ADD request to the database after it's been validated
                     * @param layer
                     * @param addEdit
                     * @param operation
                     * @param resultsArray
                     * @param objectId
                     * @param deferred
                     * @private
                     */
                    layer._pushValidatedAddFeatureToDB = function(layer,addEdit,operation,resultsArray,objectId,deferred){
                        self._editStore.pushEdit(operation, layer.url, addEdit, function (result, error) {
                            if(result){
                                resultsArray.addResults.push({success: true, error: null, objectId: objectId});

                                // Use the correct key as set by self.DB_UID
                                var tempIdObject = {};
                                tempIdObject[self.DB_UID] = objectId;

                                var phantomAdd = new Graphic(
                                    addEdit.geometry,
                                    self._getPhantomSymbol(addEdit.geometry, self._editStore.ADD),
                                    tempIdObject
                                );

                                // Add phantom graphic to the layer
                                layer._phantomLayer.add(phantomAdd);

                                // Add phantom graphic to the database
                                self._editStore.pushPhantomGraphic(phantomAdd, function (result) {
                                    if (!result) {
                                        console.log("There was a problem adding phantom graphic id: " + objectId);
                                    }
                                    console.log("Phantom graphic " + objectId + " added to database as an add.");
                                });

                                domAttr.set(phantomAdd.getNode(), "stroke-dasharray", "10,4");
                                domStyle.set(phantomAdd.getNode(), "pointer-events", "none");
                            }
                            else{
                                // If we can't push edit to database then we don't create a phantom graphic
                                resultsArray.addResults.push({success: false, error: error, objectId: objectId});
                            }

                            deferred.resolve(result);
                        });
                    };

                    /**
                     * Validates duplicate entries. Last edit on same feature can overwite any previous values.
                     * Note: if an edit was already added offline and you delete it then we return success == false
                     * @param graphic esri.Graphic.
                     * @param layerUrl the URL of the feature service
                     * @param operation add, update or delete action on an edit
                     * @returns deferred {success:boolean,graphic:graphic,operation:add|update|delete}
                     * @private
                     */
                    layer._validateFeature = function (graphic,layerUrl,operation) {

                        var deferred = new Deferred();

                        var id = layerUrl + "/" + graphic.attributes.objectid;

                        self._editStore.getEdit(id,function(success,result){
                            if (success) {
                                switch( operation )
                                {
                                    case self._editStore.ADD:
                                        // Not good - however we'll allow the new ADD to replace/overwrite existing edit
                                        // and pass it through unmodified. Last ADD wins.
                                        deferred.resolve({"success":true,"graphic":graphic,"operation":operation});
                                        break;
                                    case self._editStore.UPDATE:
                                        // If we are doing an update on a feature that has not been added to
                                        // the server yet, then we need to maintain its operation as an ADD
                                        // and not an UPDATE. This avoids the potential for an error if we submit
                                        // an update operation on a feature that has not been added to the
                                        // database yet.
                                        if(result.operation == self._editStore.ADD){
                                            graphic.operation = self._editStore.ADD;
                                            operation = self._editStore.ADD;
                                        }
                                        deferred.resolve({"success":true,"graphic":graphic,"operation":operation});
                                        break;
                                    case self._editStore.DELETE:

                                        var resolved = true;

                                        if(result.operation == self._editStore.ADD){
                                            // If we are deleting a new feature that has not been added to the
                                            // server yet we need to delete it and its phantom graphic.
                                            layer._deleteTemporaryFeature(graphic,function(success){
                                                if(!success){
                                                    resolved = false;
                                                }
                                            });
                                        }
                                        deferred.resolve({"success":resolved,"graphic":graphic,"operation":operation});
                                        break;
                                }
                            }
                            else if(result == "Id not found"){
                                // Let's simply pass the graphic back as good-to-go.
                                // No modifications needed because the graphic does not
                                // already exist in the database.
                                deferred.resolve({"success":true,"graphic":graphic,"operation":operation});
                            }
                            else{
                                deferred.reject(graphic);
                            }
                        });

                        return deferred;
                    };

                    /**
                     * Delete a graphic and its associated phantom graphic that has been added while offline.
                     * @param graphic
                     * @param callback
                     * @private
                     */
                    layer._deleteTemporaryFeature = function(graphic,callback){

                        var phantomGraphicId = self._editStore.PHANTOM_GRAPHIC_PREFIX + self._editStore._PHANTOM_PREFIX_TOKEN + graphic.attributes[self.DB_UID];

                        function _deleteGraphic(){
                            var deferred = new Deferred();
                            self._editStore.delete(layer.url,graphic,function(success,error){
                                if(success){
                                    deferred.resolve(true);
                                }
                                else{
                                    deferred.resolve(false);
                                }
                            });
                            return deferred.promise;
                        }

                        function _deletePhantomGraphic(){
                            var deferred = new Deferred();
                            self._editStore.deletePhantomGraphic(phantomGraphicId,function(success){
                                if(success){
                                    deferred.resolve(true);
                                }
                                else{
                                    deferred.resolve(false);
                                }
                            });
                            return deferred.promise;
                        }

                        all([_deleteGraphic(),_deletePhantomGraphic()]).then(function (results) {
                            callback(results);
                        });

                    };

                    layer._getFilesFromForm = function (formNode) {
                        var files = [];
                        var inputNodes = array.filter(formNode.elements, function (node) {
                            return node.type === "file";
                        });
                        inputNodes.forEach(function (inputNode) {
                            files.push.apply(files, inputNode.files);
                        }, this);
                        return files;
                    };

                    layer._replaceFeatureIds = function (tempObjectIds, newObjectIds, callback) {
                        console.log("replacing ids of attachments", tempObjectIds, newObjectIds);
                        console.assert(tempObjectIds.length === newObjectIds.length, "arrays must be the same length");

                        if (!tempObjectIds.length) {
                            console.log("no ids to replace!");
                            callback(0);
                        }

                        var i, n = tempObjectIds.length;
                        var count = n;
                        var successCount = 0;
                        for (i = 0; i < n; i++) {
                            self.attachmentsStore.replaceFeatureId(this.url, tempObjectIds[i], newObjectIds[i], function (success) {
                                --count;
                                successCount += (success ? 1 : 0);
                                if (count === 0) {
                                    callback(successCount);
                                }
                            }.bind(this));
                        }
                    };

                    // we need to identify ADDs before sending them to the server
                    // we assign temporary ids (using negative numbers to distinguish them from real ids)
                    layer._nextTempId = -1;
                    layer._getNextTempId = function () {
                        return this._nextTempId--;
                    };

                    function _initPhantomLayer() {
                        try {
                            layer._phantomLayer = new GraphicsLayer({opacity: 0.8});
                            layer._map.addLayer(layer._phantomLayer);
                        }
                        catch (err) {
                            console.log("Unable to init PhantomLayer");
                        }
                    }

                    _initPhantomLayer();

                }, // extend

                /**
                 * Forces library into an offline state. Any edits applied during this condition will be stored locally
                 */
                goOffline: function () {
                    console.log("offlineFeatureManager going offline");
                    this._onlineStatus = this.OFFLINE;
                },

                /**
                 * Forces library to return to an online state. If there are pending edits,
                 * an attempt will be made to sync them with the remote feature server
                 * @param callback callback( boolean, errors )
                 */
                goOnline: function (callback) {
                    console.log("offlineFeaturesManager going online");
                    this._onlineStatus = this.RECONNECTING;
                    this._replayStoredEdits(function (success, responses) {
                        var result = {features: {success: success, responses: responses}};
                        this._onlineStatus = this.ONLINE;
                        if (this.attachmentsStore != null) {
                            console.log("sending attachments");
                            this._sendStoredAttachments(function (success, uploadedResponses, dbResponses) {
                                this._onlineStatus = this.ONLINE;
                                result.attachments = {success: success, responses: uploadedResponses, dbResponses: dbResponses};
                                callback && callback(result);
                            }.bind(this));
                        }
                        else {
                            this._onlineStatus = this.ONLINE;
                            callback && callback(result);
                        }
                    }.bind(this));
                },

                /**
                 * Determines if offline or online condition exists
                 * @returns {string} ONLINE or OFFLINE
                 */
                getOnlineStatus: function () {
                    return this._onlineStatus;
                },

                /**
                * Serialize the feature layer graphics
                * @param features Array of features
                * @param callback Returns a JSON string
                */
                serializeFeatureGraphicsArray: function (features, callback) {
                    var length = features.length;
                    var jsonArray = [];
                    for (var i = 0; i < length; i++) {
                        var jsonGraphic = features[i].toJson();
                        jsonArray.push(jsonGraphic);
                        if (i == (length - 1)) {
                            var featureJSON = JSON.stringify(jsonArray);
                            callback(featureJSON);
                            break;
                        }
                    }
                },

                /* internal methods */

                /**
                 * Intialize the database and push featureLayer JSON to DB if required
                 * @param dataStore Object
                 * @param callback
                 * @private
                 */
                _initializeDB: function(dataStore,callback){

                    var editStore = this._editStore;

                    // Configure the database
                    editStore.dbName = this.DB_NAME;
                    editStore.objectStoreName = this.DB_OBJECTSTORE_NAME;
                    editStore.objectId = this.DB_UID;

                    // Attempt to initialize the database
                    editStore.init(function (result, error) {

                        ////////////////////////////////////////////////////
                        // OFFLINE RESTART CONFIGURATION
                        // Added @ v2.5
                        //
                        // Configure database for offline restart
                        // dataStore object allows you to store data that you'll
                        // use after an offline browser restart.
                        //
                        // If dataStore Object is not defined then do nothing.
                        //
                        ////////////////////////////////////////////////////

                        if (typeof dataStore === "object" && result === true && (dataStore !== undefined) && (dataStore !== null)) {
                            editStore.pushFeatureLayerJSON(dataStore, function (success, err) {
                                if (success) {
                                    callback(true, null);
                                }
                                else {
                                    callback(false, err);
                                }
                            });
                        }
                        else if(result){
                            callback(true, null);
                        }
                        else{
                            callback(false, error);
                        }
                    });
                },

                /**
                 * internal method that checks if this browser supports everything that is needed to handle offline attachments
                 * it also extends XMLHttpRequest with sendAsBinary() method, needed in Chrome
                 */
                _checkFileAPIs: function () {
                    if (window.File && window.FileReader && window.FileList && window.Blob) {
                        console.log("All APIs supported!");

                        if (!XMLHttpRequest.prototype.sendAsBinary) {
                            // https://code.google.com/p/chromium/issues/detail?id=35705#c40
                            XMLHttpRequest.prototype.sendAsBinary = function (datastr) {
                                function byteValue(x) {
                                    return x.charCodeAt(0) & 0xff; // jshint ignore:line
                                }

                                var ords = Array.prototype.map.call(datastr, byteValue);
                                var ui8a = new Uint8Array(ords);
                                this.send(ui8a.buffer);
                            };
                            console.log("extending XMLHttpRequest");
                        }
                        return true;
                    }
                    console.log("The File APIs are not fully supported in this browser.");
                    return false;
                },

                /**
                 * internal method that extends an object with sendAsBinary() method
                 * sometimes extending XMLHttpRequest.prototype is not enough, as ArcGIS JS lib seems to mess with this object too
                 * @param oAjaxReq object to extend
                 */
                _extendAjaxReq: function (oAjaxReq) {
                    oAjaxReq.sendAsBinary = XMLHttpRequest.prototype.sendAsBinary;
                    console.log("extending XMLHttpRequest");
                },

                //
                // phantom symbols
                //

                _phantomSymbols: [],

                _getPhantomSymbol: function (geometry, operation) {
                    if (this._phantomSymbols.length === 0) {
                        var color = [0, 255, 0, 255];
                        var width = 1.5;

                        this._phantomSymbols.point = [];
                        this._phantomSymbols.point[this._editStore.ADD] = new SimpleMarkerSymbol({
                            "type": "esriSMS", "style": "esriSMSCross",
                            "xoffset": 10, "yoffset": 10,
                            "color": [255, 255, 255, 0], "size": 15,
                            "outline": {"color": color, "width": width, "type": "esriSLS", "style": "esriSLSSolid"}
                        });
                        this._phantomSymbols.point[this._editStore.UPDATE] = new SimpleMarkerSymbol({
                            "type": "esriSMS", "style": "esriSMSCircle",
                            "xoffset": 0, "yoffset": 0,
                            "color": [255, 255, 255, 0], "size": 15,
                            "outline": {"color": color, "width": width, "type": "esriSLS", "style": "esriSLSSolid"}
                        });
                        this._phantomSymbols.point[this._editStore.DELETE] = new SimpleMarkerSymbol({
                            "type": "esriSMS", "style": "esriSMSX",
                            "xoffset": 0, "yoffset": 0,
                            "color": [255, 255, 255, 0], "size": 15,
                            "outline": {"color": color, "width": width, "type": "esriSLS", "style": "esriSLSSolid"}
                        });
                        this._phantomSymbols.multipoint = null;

                        this._phantomSymbols.polyline = [];
                        this._phantomSymbols.polyline[this._editStore.ADD] = new SimpleLineSymbol({
                            "type": "esriSLS", "style": "esriSLSSolid",
                            "color": color, "width": width
                        });
                        this._phantomSymbols.polyline[this._editStore.UPDATE] = new SimpleLineSymbol({
                            "type": "esriSLS", "style": "esriSLSSolid",
                            "color": color, "width": width
                        });
                        this._phantomSymbols.polyline[this._editStore.DELETE] = new SimpleLineSymbol({
                            "type": "esriSLS", "style": "esriSLSSolid",
                            "color": color, "width": width
                        });

                        this._phantomSymbols.polygon = [];
                        this._phantomSymbols.polygon[this._editStore.ADD] = new SimpleFillSymbol({
                            "type": "esriSFS",
                            "style": "esriSFSSolid",
                            "color": [255, 255, 255, 0],
                            "outline": {"type": "esriSLS", "style": "esriSLSSolid", "color": color, "width": width}
                        });
                        this._phantomSymbols.polygon[this._editStore.UPDATE] = new SimpleFillSymbol({
                            "type": "esriSFS",
                            "style": "esriSFSSolid",
                            "color": [255, 255, 255, 0],
                            "outline": {"type": "esriSLS", "style": "esriSLSDash", "color": color, "width": width}
                        });
                        this._phantomSymbols.polygon[this._editStore.DELETE] = new SimpleFillSymbol({
                            "type": "esriSFS",
                            "style": "esriSFSSolid",
                            "color": [255, 255, 255, 0],
                            "outline": {"type": "esriSLS", "style": "esriSLSDot", "color": color, "width": width}
                        });
                    }

                    return this._phantomSymbols[geometry.type][operation];
                },

                //
                // methods to handle attachment uploads
                //

                _fieldSegment: function (name, value) {
                    return "Content-Disposition: form-data; name=\"" + name + "\"\r\n\r\n" + value + "\r\n";
                },

                _fileSegment: function (fieldName, fileName, fileType, fileContent) {
                    return "Content-Disposition: form-data; name=\"" + fieldName +
                        "\"; filename=\"" + fileName +
                        "\"\r\nContent-Type: " + fileType + "\r\n\r\n" +
                        fileContent + "\r\n";
                },

                _uploadAttachment: function (attachment) {
                    var dfd = new Deferred();

                    var layer = this._featureLayers[attachment.featureLayerUrl];

                    var formData = new FormData();
                    formData.append("attachment",attachment.file);

                    switch(attachment.type){
                        case this.attachmentsStore.TYPE.ADD:
                            layer.addAttachment(attachment.objectId,formData,function(evt){
                                dfd.resolve({attachmentResult:evt,id:attachment.id});
                            },function(err){
                                dfd.reject(err);
                            });
                            break;
                        case this.attachmentsStore.TYPE.UPDATE:
                            formData.append("attachmentId", attachment.id);

                            // NOTE:
                            // We need to handle updates different from ADDS and DELETES because of how the JS API
                            // parses the DOM formNode property.
                            layer._sendAttachment("update",/* objectid */attachment.objectId, formData,function(evt){
                                dfd.resolve({attachmentResult:evt,id:attachment.id});
                            },function(err){
                                dfd.reject(err);
                            });

                            break;
                        case this.attachmentsStore.TYPE.DELETE:
                            // IMPORTANT: This method returns attachmentResult as an Array. Whereas ADD and UPDATE do not!!
                            layer.deleteAttachments(attachment.objectId,[attachment.id],function(evt){
                                dfd.resolve({attachmentResult:evt,id:attachment.id});
                            },function(err){
                                dfd.reject(err);
                            });
                            break;
                    }

                    return dfd.promise;
                },

                _deleteAttachmentFromDB: function (attachmentId, uploadResult) {
                    var dfd = new Deferred();

                    console.log("upload complete", uploadResult, attachmentId);
                    this.attachmentsStore.delete(attachmentId, function (success) {
                        console.assert(success === true, "can't delete attachment already uploaded");
                        console.log("delete complete", success);
                        dfd.resolve({success:success,result:uploadResult});
                    });

                    return dfd;
                },

                /**
                 * Removes attachments from DB if they were successfully uploaded
                 * @param results promises.results
                 * @callback callback callback( {errors: boolean, attachmentsDBResults: results, uploadResults: results} )
                 * @private
                 */
                _cleanAttachmentsDB: function(results,callback){

                    var self = this;
                    var promises = [];
                    var count = 0;

                    results.forEach(function(value){

                        if(typeof value.attachmentResult == "object" && value.attachmentResult.success){
                            // Delete an attachment from the database if it was successfully
                            // submitted to the server.
                            promises.push(self._deleteAttachmentFromDB(value.id,null));
                        }
                        // NOTE: layer.deleteAttachments returns an array rather than an object
                        else if(value.attachmentResult instanceof Array){

                            // Because we get an array we have to cycle thru it to verify all results
                            value.attachmentResult.forEach(function(deleteValue){
                                if(deleteValue.success){
                                    // Delete an attachment from the database if it was successfully
                                    // submitted to the server.
                                    promises.push(self._deleteAttachmentFromDB(value.id,null));
                                }
                                else {
                                    count++;
                                }
                            });
                        }
                        else{
                            // Do nothing. Don't delete attachments from DB if we can't upload them
                            count++;
                        }
                    });

                    var allPromises = all(promises);
                    allPromises.then(function(dbResults){
                       if(count > 0){
                           // If count is greater than zero then we have errors and need to set errors to true
                           callback({errors: true, attachmentsDBResults: dbResults, uploadResults: results});
                       }
                       else{
                           callback({errors: false, attachmentsDBResults: dbResults, uploadResults: results});
                       }
                    });
                },

                /**
                 * Attempts to upload stored attachments when the library goes back on line.
                 * @param callback callback({success: boolean, uploadResults: results, dbResults: results})
                 * @private
                 */
                _sendStoredAttachments: function (callback) {
                    this.attachmentsStore.getAllAttachments(function (attachments) {

                        var self = this;

                        console.log("we have", attachments.length, "attachments to upload");

                        var promises = [];
                        attachments.forEach(function (attachment) {
                            console.log("sending attachment", attachment.id, "to feature", attachment.featureId);

                            var uploadAttachmentComplete =
                                this._uploadAttachment(attachment);
                                    //.then(function (uploadResult) {
                                    //    if (uploadResult.addAttachmentResult && uploadResult.addAttachmentResult.success === true) {
                                    //        console.log("upload success", uploadResult.addAttachmentResult.success);
                                    //        return this._deleteAttachment(attachment.id, uploadResult);
                                    //    }
                                    //    else {
                                    //        console.log("upload failed", uploadResult);
                                    //        return null;
                                    //    }
                                    //}.bind(this),
                                    //function (err) {
                                    //    console.log("failed uploading attachment", attachment);
                                    //    return null;
                                    //}
                                //);
                            promises.push(uploadAttachmentComplete);
                        }, this);
                        console.log("promises", promises.length);
                        var allPromises = all(promises);
                        allPromises.then(function (uploadResults) {
                                console.log(uploadResults);
                                self._cleanAttachmentsDB(uploadResults,function(dbResults){
                                    if(dbResults.errors){
                                        callback && callback(false, uploadResults,dbResults);
                                    }
                                    else{
                                        callback && callback(true, uploadResults,dbResults);
                                    }
                                });
                                //results.forEach(function(value){
                                //    if(value.attachmentResult.success){
                                //        // Delete an attachment from the database if it was successfully
                                //        // submitted to the server.
                                //        self._deleteAttachmentFromDB(value.id,null).then(function(result){
                                //            if(result.success){
                                //                callback && callback(true, results);
                                //            }
                                //            else{
                                //                callback && callback(false, results);
                                //            }
                                //        });
                                //    }
                                //});
                            },
                            function (err) {
                                console.log("error!", err);
                                callback && callback(false, err);
                            });
                    }.bind(this));
                },

                //
                // methods to send features back to the server
                //

                /**
                 * Attempts to send any edits in the database. Monitor events for success or failure.
                 * @param callback
                 * @event ALL_EDITS_SENT when all edits have been successfully sent. Contains {[addResults],[updateResults],[deleteResults]}
                 * @event EDITS_SENT_ERROR some edits were not sent successfully. Contains {msg: error}
                 * @private
                 */
                _replayStoredEdits: function (callback) {
                    var promises = {};
                    var that = this;

                    //
                    // send edits for each of the layers
                    //
                    var layer;
                    var adds = [], updates = [], deletes = [];
                    var tempObjectIds = [];
                    var tempArray = [];
                    var featureLayers = this._featureLayers;
                    var attachmentsStore = this.attachmentsStore;
                    var editStore = this._editStore;

                    this._editStore.getAllEditsArray(function (result, err) {
                        if (result.length > 0) {
                            tempArray = result;

                            var length = tempArray.length;

                            for (var n = 0; n < length; n++) {
                                layer = featureLayers[tempArray[n].layer];

                                // If the layer has attachments then check to see if the attachmentsStore has been initialized
                                if (attachmentsStore == null && layer.hasAttachments) {
                                    console.log("NOTICE: you may need to run OfflineFeaturesManager.initAttachments(). Check the Attachments doc for more info. Layer id: " + layer.id + " accepts attachments");
                                }
                                else if(layer.hasAttachments === false){
                                    console.error("WARNING: Layer " + layer.id + "doesn't seem to accept attachments. Recheck the layer permissions.");
                                    callback(false,"WARNING: Attachments not supported in layer: " + layer.id);
                                }

                                // Assign the attachmentsStore to the layer as a private var so we can access it from
                                // the promises applyEdits() method.
                                layer._attachmentsStore = attachmentsStore;

                                layer.__onEditsComplete = layer.onEditsComplete;
                                layer.onEditsComplete = function () {
                                    console.log("intercepting events onEditsComplete");
                                };

                                // Let's zero everything out
                                adds = [], updates = [], deletes = [], tempObjectIds = [];

                                // IMPORTANT: reconstitute the graphic JSON into an actual esri.Graphic object
                                // NOTE: we are only sending one Graphic per loop!
                                var graphic = new Graphic(tempArray[n].graphic);

                                switch (tempArray[n].operation) {
                                    case editStore.ADD:
                                        for (var i = 0; i < layer.graphics.length; i++) {
                                            var g = layer.graphics[i];
                                            if (g.attributes[layer.objectIdField] === graphic.attributes[layer.objectIdField]) {
                                                layer.remove(g);
                                                break;
                                            }
                                        }
                                        tempObjectIds.push(graphic.attributes[layer.objectIdField]);
                                        delete graphic.attributes[layer.objectIdField];
                                        adds.push(graphic);
                                        break;
                                    case editStore.UPDATE:
                                        updates.push(graphic);
                                        break;
                                    case editStore.DELETE:
                                        deletes.push(graphic);
                                        break;
                                }

                                promises[n] = that._internalApplyEdits(layer, tempArray[n].id, tempObjectIds, adds, updates, deletes);
                            }

                            // wait for all requests to finish
                            // responses contain {id,layer,tempId,addResults,updateResults,deleteResults}
                            var allPromises = all(promises);
                            allPromises.then(
                                function (responses) {
                                    console.log("OfflineFeaturesManager - all responses are back");
                                    this._cleanSuccessfulEditsDatabaseRecords(responses, function (success, error) {
                                        // If successful then we delete all phantom graphics in the DB.
                                        if (success) {
                                            console.log("_replayStoredEdits: CLEANED EDITS DATABASE");
                                            this._editStore.resetPhantomGraphicsQueue(function (success) {

                                                if (!success) {
                                                    console.log("There was a problem deleting phantom graphics in the database.");
                                                    this.emit(this.events.EDITS_SENT_ERROR, {msg: "Problem deleting phantom graphic(s)"});
                                                }
                                                else {
                                                    console.log("CLEANED PHANTOM GRAPHICS DATABASE");
                                                    this.emit(this.events.ALL_EDITS_SENT,responses);
                                                }
                                                callback && callback(true, responses);
                                            }.bind(this));
                                        }
                                        // If not successful then we only delete the phantom graphics that are related to
                                        // edits that were successfully synced
                                        else {
                                            console.error("_replayStoredEdits: There was a problem and not all edits were cleaned.");
                                            this._editStore.resetLimitedPhantomGraphicsQueue(responses, function (success) {
                                                if(!success) {
                                                    console.error("_replayStoredEdits.resetLimitedPhantomGraphicsQueue: There was a problem clearing the queue " + JSON.stringify(error));
                                                }
                                            });

                                            this.emit(this.events.EDITS_SENT_ERROR, {msg: responses}); // There was a problem, some edits were not successfully sent!
                                            callback && callback(false, responses);
                                        }
                                    }.bind(that));
                                }.bind(that),
                                function (errors) {
                                    console.log("OfflineFeaturesManager._replayStoredEdits - ERROR!!");
                                    console.log(errors);
                                    callback && callback(false, errors);
                                }.bind(that)
                            );

                        }
                        else{
                            // No edits were found
                            callback(true,[]);
                        }
                    });
                },

                /**
                 * Only delete items from database that were verified as successfully updated on the server.
                 * @param responses Object
                 * @param callback callback(true, responses) or callback(false, responses)
                 * @private
                 */
                _cleanSuccessfulEditsDatabaseRecords: function (responses, callback) {
                    if (Object.keys(responses).length !== 0) {

                        var editsArray = [];
                        var editsFailedArray = [];

                        for (var key in responses) {
                            if (responses.hasOwnProperty(key)) {

                                var edit = responses[key];
                                var tempResult = {};

                                if (edit.updateResults.length > 0) {
                                    if (edit.updateResults[0].success) {
                                        tempResult.layer = edit.layer;
                                        tempResult.id = edit.updateResults[0].objectId;
                                        editsArray.push(tempResult);
                                    }
                                    else {
                                        editsFailedArray.push(edit);
                                    }
                                }
                                if (edit.deleteResults.length > 0) {
                                    if (edit.deleteResults[0].success) {
                                        tempResult.layer = edit.layer;
                                        tempResult.id = edit.deleteResults[0].objectId;
                                        editsArray.push(tempResult);
                                    }
                                    else {
                                        editsFailedArray.push(edit);
                                    }
                                }
                                if (edit.addResults.length > 0) {
                                    if (edit.addResults[0].success) {
                                        tempResult.layer = edit.layer;
                                        tempResult.id = edit.tempId;
                                        editsArray.push(tempResult);
                                    }
                                    else {
                                        editsFailedArray.push(edit);
                                    }
                                }
                            }
                        }

                        var promises = {};
                        var length = editsArray.length;
                        for (var i = 0; i < length; i++) {
                            promises[i] = this._updateDatabase(editsArray[i]);
                        }
                        //console.log("EDIT LIST " + JSON.stringify(editsArray));

                        // wait for all requests to finish
                        //
                        var allPromises = all(promises);
                        allPromises.then(
                            function (responses) {
                                editsFailedArray.length > 0 ? callback(false, responses) : callback(true, responses);
                            },
                            function (errors) {
                                callback(false, errors);
                            }
                        );
                    }
                    else {
                        callback(true, {});
                    }
                },

                /**
                 * Deletes edits from database.
                 * This does not handle phantom graphics!
                 * @param edit
                 * @returns {l.Deferred.promise|*|c.promise|q.promise|promise}
                 * @private
                 */
                _updateDatabase: function (edit) {
                    var dfd = new Deferred();
                    var fakeGraphic = {};
                    fakeGraphic.attributes = {};

                    // Use the correct attributes key!
                    fakeGraphic.attributes[this.DB_UID] = edit.id;

                    this._editStore.delete(edit.layer, fakeGraphic, function (success, error) {
                        if (success) {
                            dfd.resolve({success: true, error: null});
                        }
                        else {
                            dfd.reject({success: false, error: error});
                        }
                    }.bind(this));

                    return dfd.promise;

                },

                /**
                 * Retrieves f=json from the feature layer
                 * @param url FeatureLayer's URL
                 * @param callback
                 * @private
                 */
                getFeatureLayerJSON: function (url, callback) {
                    require(["esri/request"], function (esriRequest) {
                        var request = esriRequest({
                            url: url,
                            content: {f: "json"},
                            handleAs: "json",
                            callbackParamName: "callback"
                        });

                        request.then(function (response) {
                            console.log("Success: ", response);
                            callback(true, response);
                        }, function (error) {
                            console.log("Error: ", error.message);
                            callback(false, error.message);
                        });
                    });
                },

                /**
                 * Executes the _applyEdits() method
                 * @param layer
                 * @param id the unique id that identifies the Graphic in the database
                 * @param tempObjectIds
                 * @param adds
                 * @param updates
                 * @param deletes
                 * @returns {l.Deferred.promise} contains {id,layer,tempId,addResults,updateResults,deleteResults}
                 * @private
                 */
                _internalApplyEdits: function (layer, id, tempObjectIds, adds, updates, deletes) {
                    var dfd = new Deferred();

                    layer._applyEdits(adds, updates, deletes,
                        function (addResults, updateResults, deleteResults) {
                            layer._phantomLayer.clear();

                            var newObjectIds = addResults.map(function (r) {
                                return r.objectId;
                            });

                            // We use a different pattern if the attachmentsStore is valid and the layer has attachments
                            if (layer._attachmentsStore != null && layer.hasAttachments && tempObjectIds.length > 0) {
                                layer._replaceFeatureIds(tempObjectIds, newObjectIds, function (success) {
                                    dfd.resolve({
                                        id: id,
                                        layer: layer.url,
                                        tempId: tempObjectIds, // let's us internally match an ADD to it's new ObjectId
                                        addResults: addResults,
                                        updateResults: updateResults,
                                        deleteResults: deleteResults
                                    }); // wrap three arguments in a single object
                                });
                            }
                            else {
                                dfd.resolve({
                                    id: id,
                                    layer: layer.url,
                                    tempId: tempObjectIds, // let's us internally match an ADD to it's new ObjectId
                                    addResults: addResults,
                                    updateResults: updateResults,
                                    deleteResults: deleteResults
                                }); // wrap three arguments in a single object
                            }
                        },
                        function (error) {
                            layer.onEditsComplete = layer.__onEditsComplete;
                            delete layer.__onEditsComplete;

                            dfd.reject(error);
                        }
                    );
                    return dfd.promise;
                },

                /**
                 * Deprecated @ v2.5. Internal-use only
                 * @returns {string}
                 * @private
                 */
                _optimizeEditsQueue: function(){
                    return "DEPRECATED at v2.5!";
                },

                /**
                 * DEPRECATED @ v2.5. Use getAllEditsArray() and parse the results
                 * A string value representing human readable information on pending edits
                 * @param edit
                 * @returns {string}
                 */
                getReadableEdit: function (edit) {
                    return "DEPRECATED at v2.5!";
                }

            }); // declare
    }); // define