EventEmitter = require('events').EventEmitter
NavigationController = require './navigation-controller'
binding = process.atomBinding 'web_contents'
ipc = require 'ipc'

nextId = 0
getNextId = -> ++nextId

wrapWebContents = (webContents) ->
  # webContents is an EventEmitter.
  webContents.__proto__ = EventEmitter.prototype

  # WebContents::send(channel, args..)
  webContents.send = (channel, args...) ->
    @_send channel, [args...]

  # Make sure webContents.executeJavaScript would run the code only when the
  # web contents has been loaded.
  webContents.loaded = false
  webContents.once 'did-finish-load', -> @loaded = true
  webContents.executeJavaScript = (code) ->
    if @loaded
      @_executeJavaScript code
    else
      webContents.once 'did-finish-load', @_executeJavaScript.bind(this, code)

  # The navigation controller.
  controller = new NavigationController(webContents)
  for name, method of NavigationController.prototype when method instanceof Function
    do (name, method) ->
      webContents[name] = -> method.apply controller, arguments

  # Dispatch IPC messages to the ipc module.
  webContents.on 'ipc-message', (event, packed) ->
    [channel, args...] = packed
    Object.defineProperty event, 'sender', value: webContents
    ipc.emit channel, event, args...
  webContents.on 'ipc-message-sync', (event, packed) ->
    [channel, args...] = packed
    Object.defineProperty event, 'returnValue', set: (value) -> event.sendReply JSON.stringify(value)
    Object.defineProperty event, 'sender', value: webContents
    ipc.emit channel, event, args...

  webContents.printToPDF = (options, callback) ->
    printingSetting =
      pageRage:[],
      mediaSize:
        height_microns:297000,
        is_default:true,
        name:"ISO_A4",
        width_microns:210000,
        custom_display_name:"A4",
      landscape:false,
      color:2,
      headerFooterEnabled:false,
      marginsType:0,
      isFirstRequest:false,
      requestID: getNextId(),
      previewModifiable:true,
      printToPDF:true,
      printWithCloudPrint:false,
      printWithPrivet:false,
      printWithExtension:false,
      deviceName:"Save as PDF",
      generateDraftData:true,
      fitToPageEnabled:false,
      duplex:0,
      copies:1,
      collate:true,
      shouldPrintBackgrounds:false,
      shouldPrintSelectionOnly:false

    if options.landscape
      printingSetting.landscape = options.landscape
    if options.marginsType
      printingSetting.marginsType = options.marginsType
    if options.printSelectionOnly
      printingSetting.shouldPrintSelectionOnly = options.printSelectionOnly
    if options.printBackgrounds
      printingSetting.shouldPrintBackgrounds = options.printBackground

    webContents._printToPDF printingSetting, callback

  webContents

binding._setWrapWebContents wrapWebContents
process.once 'exit', binding._clearWrapWebContents

module.exports.create = (options={}) ->
  binding.create(options)