log = require 'winston'
errors = require '../commons/errors'
scoringQueue = require '../queues/scoring'

module.exports.setup = (app) ->
  scoringQueue.setup()

  #app.post '/queue/scoring/pairwise', (req, res) ->
  #  handler = loadQueueHandler 'scoring'
  #  handler.addPairwiseTaskToQueue req, res

  app.get '/queue/messagesInQueueCount', (req, res) ->
    handler = loadQueueHandler 'scoring'
    handler.messagesInQueueCount req, res

  app.post '/queue/scoring/getTwoGames', (req, res) ->
    handler = loadQueueHandler 'scoring'
    handler.getTwoGames req, res

  app.put '/queue/scoring/recordTwoGames', (req, res) ->
    handler = loadQueueHandler 'scoring'
    handler.recordTwoGames req, res

  app.all '/queue/*', (req, res) ->
    setResponseHeaderToJSONContentType res

    queueName = getQueueNameFromPath req.path
    try
      handler = loadQueueHandler queueName
      if isHTTPMethodGet req
        handler.dispatchTaskToConsumer req, res
      else if isHTTPMethodPut req
        handler.processTaskResult req, res
      else if isHTTPMethodPost req
        handler.createNewTask req, res 
      else
        sendMethodNotSupportedError req, res
    catch error
      log.error error
      sendQueueError req, res, error

setResponseHeaderToJSONContentType = (res) -> res.setHeader('Content-Type', 'application/json')

getQueueNameFromPath = (path) ->
  pathPrefix = '/queue/'
  pathAfterPrefix = path[pathPrefix.length..]
  partsOfURL = pathAfterPrefix.split '/'
  queueName = partsOfURL[0]
  queueName

loadQueueHandler = (queueName) -> require ('../queues/' + queueName)

isHTTPMethodGet = (req) -> return req.route.method is 'get'

isHTTPMethodPost = (req) -> return req.route.method is 'post'

isHTTPMethodPut = (req) -> return req.route.method is 'put'

sendMethodNotSupportedError = (req, res) -> errors.badMethod(res, ['GET', 'POST', 'PUT'], 'Queues do not support the HTTP method used.' )

sendQueueError = (req, res, error) -> errors.serverError(res, "Route #{req.path} had a problem: #{error}")