# Description
#   Send AWS SQS messages to Hubot
#
# Configuration:
#   HUBOT_AWS_SQS_QUEUE_URL - SQS queue to listen to, e.g. https://sqs.us-east-1.amazonaws.com/XXXXXXXXXXXXX/hubot
#   HUBOT_AWS_SQS_ACCESS_KEY_ID - AWS access key id with SQS permissions
#   HUBOT_AWS_SQS_SECRET_ACCESS_KEY - AWS secret key with SQS permissions
#   HUBOT_AWS_SQS_REGION - (optional) Defaults to 'us-east-1'
#
#
# Author:
#   Tatsuhiko Miyagawa
#   @chosak
#   @contolini

AWS = require 'aws-sdk'

module.exports = (robot) ->
  unless process.env.HUBOT_AWS_SQS_QUEUE_URL
    robot.logger.error "Disabling incoming-sqs plugin because HUBOT_AWS_SQS_QUEUE_URL is not set."
    return

  sqs = new AWS.SQS {
    region: process.env.HUBOT_AWS_SQS_REGION or process.env.AWS_REGION or "us-east-1"
    accessKeyId: process.env.HUBOT_AWS_SQS_ACCESS_KEY_ID
    secretAccessKey: process.env.HUBOT_AWS_SQS_SECRET_ACCESS_KEY
  }

  receiver = (sqs, queue) ->
    robot.logger.debug "Fetching from #{queue}"
    sqs.receiveMessage {
      QueueUrl: queue
      MaxNumberOfMessages: 10
      VisibilityTimeout: 30
      WaitTimeSeconds: 20
      MessageAttributeNames: [
        "room"
        "user"
      ]
    }, (err, data) ->
      if err?
        robot.logger.error "Unable to connect to AWS SQS!"
        return robot.logger.error err
      else if data.Messages
        data.Messages.forEach (message) ->
          if not message.MessageAttributes
            return robot.logger.error "SQS message is missing user and room attributes."
          if not message.MessageAttributes.user
            return robot.logger.error "Username is missing from SQS message."
          if not message.MessageAttributes.room
            return robot.logger.error "Room is missing from SQS message."
          new Command({
              user: message.MessageAttributes.user.StringValue
              room: message.MessageAttributes.room.StringValue
            }
            message.Body
            robot
          ).run()
          sqs.deleteMessage {
            QueueUrl: queue
            ReceiptHandle: message.ReceiptHandle
          }, (err, data) ->
            robot.logger.error err if err?
      setTimeout receiver, 50, sqs, queue

  setTimeout receiver, 0, sqs, process.env.HUBOT_AWS_SQS_QUEUE_URL

class Command
  constructor: (@envelope, @message, @robot) ->

  run: ->
    try
      @robot.send @envelope, @message
    catch err
      @robot.logger.error err