'use strict';

/**
 * JAWS Command: new
 * - Asks the user for information about their new JAWS project
 * - Creates a new project in the current working directory
 */


// Defaults
var Promise     = require('bluebird'),
fs              = Promise.promisifyAll(require('fs')),
os              = require('os'),
async           = require('async'),
AWS             = require('aws-sdk'),
inquirer        = require('inquirer'),
chalk           = require('chalk'),
jsonfile        = Promise.promisifyAll(require('jsonfile')),
shortid         = require('shortid');


// AWS IAM Role True Policy
var iamRoleTrustPolicy = JSON.stringify({
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
});

// AWS IAM Role Access Policy
var iamRoleAccessPolicy   = JSON.stringify({
  "Version": "2012-10-17",
  "Principal": {
    "Service": "lambda.amazonaws.com"
  },
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "cloudwatch:*",
        "cognito-identity:ListIdentityPools",
        "cognito-sync:GetCognitoEvents",
        "cognito-sync:SetCognitoEvents",
        "dynamodb:*",
        "iam:ListAttachedRolePolicies",
        "iam:ListRolePolicies",
        "iam:ListRoles",
        "iam:PassRole",
        "kinesis:DescribeStream",
        "kinesis:ListStreams",
        "kinesis:PutRecord",
        "lambda:*",
        "logs:*",
        "s3:*",
        "sns:ListSubscriptions",
        "sns:ListSubscriptionsByTopic",
        "sns:ListTopics",
        "sns:Subscribe",
        "sns:Unsubscribe"
      ],
      "Resource": "*"
    }
  ]
});


module.exports = function(JAWS) {

  JAWS.new = function()  {

    var iam         = new AWS.IAM();
    var project     = {};

    // Define User Prompts
    var userPrompts = new Promise(function(resolve, reject){

      // Define Prompts
      var prompts = [
        // Request Project Name
        {
          type: 'input',
          name: 'name',
          message: '**** WELCOME TO JAWS: Type a name for your new project (max 20 chars):',
          default: 'jaws-new-' + shortid.generate()
        },
        // Request AWS Admin API Key
        {
          type: 'input',
          name: 'awsAdminKeyId',
          message: '**** JAWS: Please enter the ACCESS KEY ID for your AWS IAM User:'
        },
        // Request AWS Admin API Secret Key
        {
          type: 'input',
          name: 'awsAdminSecretKey',
          message: '**** JAWS: Please enter the SECRET ACCESS KEY for your AWS IAM User:'
        },
        // Request Stages
        {
          type: 'rawlist',
          name: 'stages',
          message: '**** JAWS: Which stages would you like to use (you can change later)?',
          choices: [
            'dev,prod',
            'dev,staging,prod',
            'dev,staging,test,prod'
          ]
        }
      ];

      inquirer.prompt(prompts, function( answers ) {

          // Validate
          if (!answers.awsAdminKeyId) return console.log('****** JAWS Error: An AWS Access Key ID is required');
          if (!answers.awsAdminSecretKey) return console.log('****** JAWS Error: An AWS Secret Key is required');

          // Set and sanitize project info
          project.name = answers.name.toLowerCase().trim().replace(/[^a-zA-Z-\d\s:]/g, '').replace(/\s/g, '-').substring(0,19);
          project.awsAdminKeyId = answers.awsAdminKeyId.trim();
          project.awsAdminSecretKey = answers.awsAdminSecretKey.trim();
          project.stages = answers.stages.split(',');

          return resolve();
      });
    });

    // Process
    userPrompts.then(function(){

      // Set project root path.  Append unique id if name is in use
      if (fs.existsSync(JAWS._meta.cwd + '/' + project.name)) {

        // Name must be unique or lots of things will break
        project.name = project.name + '-' + shortid.generate();
        JAWS._meta.projectRootPath = './' + project.name;

      } else {
        JAWS._meta.projectRootPath = project.name.replace(/\s/g, '-');
      }

      // Create project root directory
      return fs.mkdirAsync(JAWS._meta.projectRootPath);

    }).then(function(){

      // Create project/back
      return fs.mkdirAsync(JAWS._meta.projectRootPath + '/back');

    }).then(function(){

      // Create project/front
      return fs.mkdirAsync(JAWS._meta.projectRootPath + '/front');

    }).then(function(){

      // Create project/front
      return fs.mkdirAsync(JAWS._meta.projectRootPath + '/tests');

    }).then(function(){

      // Create admin.env
      var adminEnv = 'ADMIN_AWS_ACCESS_KEY_ID=' + project.awsAdminKeyId + os.EOL + 'ADMIN_AWS_SECRET_ACCESS_KEY=' + project.awsAdminSecretKey;
      return fs.writeFile(JAWS._meta.projectRootPath + '/admin.env', adminEnv);

    }).catch(function(e) {

      console.error(e);

    }).finally(function() {

      // Configure AWS SDK
      AWS.config.update({
        accessKeyId: project.awsAdminKeyId,
        secretAccessKey: project.awsAdminSecretKey
      });

      // Create IAM Role for each stage
      async.eachSeries(project.stages, function(stage, stageCallback) {

          // Inform
          console.log('****** JAWS: Creating an IAM Role for stage: ' + stage);

          var params = {
            AssumeRolePolicyDocument: iamRoleTrustPolicy,
            RoleName: stage + '_-_' + project.name + '_-_' + 'jaws-role'
          };

          iam.createRole(params, function(err, data) {

            if (err) return console.log(err, err.stack);

            project.stages[project.stages.indexOf(stage)] = {
              stage: stage,
              iamRole: data.Role.RoleName,
              iamRoleArn: data.Role.Arn
            };

            // Inform
            console.log('****** JAWS: IAM Role created successfully for stage: ' + stage);

            // Callback
            return stageCallback();
          });

        }, function(error) {

          // Create awsm.json
          var awsmJson = {
            name:               project.name,
            version:            JAWS._meta.version,
            type:               'aws_v1',
            profile:            'project',
            author:             'Seymore Serverless <seymore@gmail.com> http://seymore.io',
            location:           '<enter project\'s github repository url here>',
            stages:             project.stages,
            awsRegions:         [ 'us-east-1' ],
            cfTemplate:         {}
          };
          jsonfile.spaces = 2;
          jsonfile.writeFileSync(JAWS._meta.projectRootPath + '/awsm.json', awsmJson);

          // End
          console.log('****** JAWS FINISHED: Your project "' + project.name + '" has been successfully created in the current directory.');

        });
    });
  };
};