'use strict';

/**
 * JAWS Command: postinstall
 * - Performs automation after an aws-module is installed via a package manager
 */

let ProjectCmd = require('./ProjectCmd.js'),
    JawsError = require('../jaws-error'),
    Promise = require('bluebird'),
    JawsCLI = require('../utils/cli'),
    utils = require('../utils'),
    path = require('path'),
    fs = require('fs'),
    wrench = require('wrench'),
    temp = require('temp'),
    chalk = require('chalk');

Promise.promisifyAll(fs);
Promise.promisifyAll(temp);
Promise.promisifyAll(wrench);

temp.track();

var CMD = class Postinstall extends ProjectCmd {
  constructor(JAWS, moduleName, packageManager) {
    super(JAWS);
    if (['npm'].indexOf(packageManager) == -1) {
      return Promise.reject(new JawsError('Unsupported package manager', JawsError.errorCodes.UNKNOWN));
    }
    this._moduleName = moduleName;
    this._packageManager = packageManager;
    this._rootAwsmJson = {};
  }

  run() {
    let _this = this;

    // Skip when using "npm link"
    if (!utils.fileExistsSync(path.join(process.cwd(), 'jaws.json'))) {
      switch (_this._packageManager) {
        case 'npm':
          if (!utils.fileExistsSync(path.join(process.cwd(), '..', '..', 'jaws.json'))) {
            JawsCLI.log('Skipping postinstall...');
            return Promise.resolve();
          }
          break;
      }
    }

    return _this._JAWS.validateProject()
        .bind(_this)
        .then(_this._installFiles)
        .then(function(module) {
          return Promise.all([module, _this._saveCfTemplate(module.path)]);
        })
        .spread(function(module) {
          let deferredDepInstalls = [];

          switch (_this._packageManager) {
            case 'npm':
              if (utils.fileExistsSync(path.join(module.path, 'package.json'))) {
                deferredDepInstalls.push(utils.npmInstall(module.path));
              }
              break;
            default:
              throw new JawsError('Unsupported package manager', JawsError.errorCodes.UNKNOWN);
              break;
          }

          if (deferredDepInstalls.length > 0) {
            JawsCLI.log('Installing ' + _this._packageManager + ' dependencies...');
          }

          return Promise.all(deferredDepInstalls);
        })
        .then(function() {
          return utils.findAllEnvletsForAwsm(_this._JAWS._meta.projectRootPath, _this._moduleName);
        })
        .then(function(envlets) {
          JawsCLI.log('Successfully installed ' + _this._moduleName);

          if (envlets && envlets.length > 1) {
            JawsCLI.log(
                chalk.bgYellow.white(' WARN ') +
                chalk.magenta(' This aws module uses env lets MAKE SURE to run jaws env list to see which ones need to be set')
            );
          }
        });
  }

  /**
   *
   * @returns {Promise} object {name: awsmJson.name, path: targetModPath}
   * @private
   */
  _installFiles() {

    let _this = this,
        pkgMgrDir;

    if (_this._packageManager == 'npm') {
      pkgMgrDir = 'node_modules';
    }

    let srcAwsmPath = path.join(_this._JAWS._meta.projectRootPath, pkgMgrDir, _this._moduleName, 'awsm'),
        srcAwsmJsonPath = path.join(_this._JAWS._meta.projectRootPath, pkgMgrDir, _this._moduleName, 'awsm.json'),
        awsModsPath = path.join(_this._JAWS._meta.projectRootPath, 'aws_modules');

    if (!utils.fileExistsSync(srcAwsmJsonPath)) {
      return Promise.reject(new JawsError('Module missing awsm.json file in root of project', JawsError.errorCodes.UNKNOWN));
    }

    let awsmJson = utils.readAndParseJsonSync(srcAwsmJsonPath);
    _this._rootAwsmJson = awsmJson;

    if (!awsmJson.name) {
      return Promise.reject(new JawsError('awsm.json for module missing name attr', JawsError.errorCodes.UNKNOWN));
    }

    let targetModPath = path.join(awsModsPath, awsmJson.name);

    if (!_this._delExisting && utils.dirExistsSync(targetModPath)) {
      return Promise.reject(new JawsError('Module named ' + awsmJson.name + ' already exists in your project', JawsError.errorCodes.UNKNOWN));
    }

    if (
        (!awsmJson.resources) || (!awsmJson.resources.cloudFormation) ||
        (!awsmJson.resources.cloudFormation.LambdaIamPolicyDocumentStatements) ||
        (!awsmJson.resources.cloudFormation.ApiGatewayIamPolicyDocumentStatements)
    ) {
      return Promise.reject(new JawsError('Module does not have required cloudFormation attributes', JawsError.errorCodes.UNKNOWN));
    }

    //Copy over jaws awsm scaffolding
    JawsCLI.log(`Copying ${srcAwsmPath} to ${targetModPath}`);
    wrench.copyDirSyncRecursive(
        srcAwsmPath,
        targetModPath, {
          forceDelete: true,
          excludeHiddenUnix: false,
        });

    //Write mod root awsm.json so we can identify awsm dirs later
    return utils.writeFile(path.join(targetModPath, 'awsm.json'), JSON.stringify(awsmJson, null, 2))
        .then(function() {
          return {name: awsmJson.name, path: targetModPath};
        });
  }

  /**
   * Save CloudFormation attrs
   *
   * @returns {Promise}
   * @private
   */
  _saveCfTemplate() {
    let _this = this,
        awsmJson = _this._rootAwsmJson,
        projectCfPath = path.join(this._JAWS._meta.projectRootPath, 'cloudformation');

    let cfExtensionPoints = awsmJson.resources.cloudFormation;

    if (!utils.dirExistsSync(projectCfPath)) {
      return Promise.reject(new JawsError('Your project has no cloudformation dir', JawsError.errorCodes.UNKNOWN));
    }

    //Update every resources-cf.json for every stage and region. Deep breath...
    return new Promise(function(resolve, reject) {
      resolve(wrench.readdirSyncRecursive(projectCfPath))
    })
        .then(function(files) {
          files.forEach(function(file) {
            file = path.join(projectCfPath, file);
            if (utils.endsWith(file, 'resources-cf.json')) {
              let regionStageResourcesCfJson = utils.readAndParseJsonSync(file);

              if (cfExtensionPoints.LambdaIamPolicyDocumentStatements.length > 0) {
                JawsCLI.log('Merging in Lambda IAM Policy statements from awsm');
              }
              cfExtensionPoints.LambdaIamPolicyDocumentStatements.forEach(function(policyStmt) {
                regionStageResourcesCfJson.Resources.IamPolicyLambda.Properties.PolicyDocument.Statement.push(policyStmt);
              });

              if (cfExtensionPoints.ApiGatewayIamPolicyDocumentStatements.length > 0) {
                JawsCLI.log('Merging in API Gateway IAM Policy statements from awsm');
              }
              cfExtensionPoints.ApiGatewayIamPolicyDocumentStatements.forEach(function(policyStmt) {
                regionStageResourcesCfJson.Resources.IamPolicyApiGateway.Properties.PolicyDocument.Statement.push(policyStmt);
              });

              let cfResourceKeys = Object.keys(cfExtensionPoints.Resources);

              if (cfResourceKeys.length > 0) {
                JawsCLI.log('Merging in CF Resources from awsm');
              }
              cfResourceKeys.forEach(function(resourceKey) {
                if (regionStageResourcesCfJson.Resources[resourceKey]) {
                  JawsCLI.log(
                      chalk.bgYellow.white(' WARN ') +
                      chalk.magenta(` Resource key ${resourceKey} already defined in ${file}. Overwriting...`)
                  );
                }

                regionStageResourcesCfJson.Resources[resourceKey] = cfExtensionPoints.Resources[resourceKey];
              });

              utils.writeFile(file, JSON.stringify(regionStageResourcesCfJson, null, 2));
            }
          });
        });
  }
};

/**************************************
 * EXPORTS
 **************************************/
module.exports.run = function(JAWS, moduleName, packageManager) {
  let command = new CMD(JAWS, moduleName, packageManager);
  return command.run();
};

module.exports.Postinstall = CMD;