// Copyright (c) 2013 Adobe Systems Inc

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package com.adobe.flascc
{
  import flash.display.DisplayObjectContainer;
  import flash.display.Sprite;
  import flash.display.StageScaleMode;
  import flash.events.Event;
  import flash.net.LocalConnection;
  import flash.net.URLRequest;
  import flash.text.TextField;
  import flash.utils.ByteArray;

  import com.adobe.flascc.vfs.HTTPBackingStore;
  import com.adobe.flascc.vfs.ISpecialFile;
  import com.adobe.flascc.vfs.LSOBackingStore;
  import com.adobe.flascc.vfs.RootFSBackingStore;

  /**
  * A basic implementation of a console for FlasCC apps.
  * The PlayerKernel class delegates to this for things like read/write
  * so that console output can be displayed in a TextField on the Stage.
  */
  public class Console extends Sprite implements ISpecialFile
  {
    private var enableConsole:Boolean = true
    private var _tf:TextField
    private var inputContainer:DisplayObjectContainer

    private var alclogo:String = "FlasCC"
    private var webfs:HTTPBackingStore = null

    /**
    * To Support the preloader case you might want to have the Console
    * act as a child of some other DisplayObjectContainer.
    */
    public function Console(container:DisplayObjectContainer = null)
    {
      CModule.rootSprite = container ? container.root : this

      if(container) {
        container.addChild(this)
        init(null)
      } else {
        addEventListener(Event.ADDED_TO_STAGE, init)
      }
    }

    /**
    * All of the real FlasCC init happens in this method
    * which is either run on startup or once the SWF has
    * been added to the stage.
    */
    protected function init(e:Event):void
    {
      inputContainer = new Sprite()
      addChild(inputContainer)

      addEventListener(Event.ENTER_FRAME, enterFrame)

      stage.frameRate = 60
      stage.scaleMode = StageScaleMode.NO_SCALE

      if(enableConsole) {
        _tf = new TextField
        _tf.multiline = true
        _tf.width = stage.stageWidth
        _tf.height = stage.stageHeight 
        inputContainer.addChild(_tf)
      }

      // PlayerKernel will delegate read/write requests to the "/dev/tty"
      // file to the object specified with this API.
      CModule.vfs.console = this
      CModule.vfs.addBackingStore(new RootFSBackingStore(), null)
      CModule.vfs.addDirectory("/local")
      CModule.vfs.addBackingStore(
        new LSOBackingStore("samplevfsLSO"), "/local")
      var ba:ByteArray = new ByteArray()
      ba.writeUTFBytes(alclogo)
      CModule.vfs.addFile("/flascclogo.txt", ba)

      webfs = new HTTPBackingStore()
      webfs.addEventListener(Event.COMPLETE, onComplete)
    }

    private function onComplete(e:Event):void {
      CModule.vfs.addDirectory("/web")
      CModule.vfs.addBackingStore(webfs, "/web")
      CModule.startAsync(this)
    }

    /**
    * The callback to call when FlasCC code calls the posix exit() function. Leave null to exit silently.
    * @private
    */
    public var exitHook:Function;

    /**
    * The PlayerKernel implementation will use this function to handle
    * C process exit requests
    */
    public function exit(code:int):Boolean
    {
      // default to unhandled
      return exitHook ? exitHook(code) : false;
    }

    /**
    * The PlayerKernel implementation will use this function to handle
    * C IO write requests to the file "/dev/tty" (e.g. output from
    * printf will pass through this function). See the ISpecialFile
    * documentation for more information about the arguments and return value.
    */
    public function write(fd:int, bufPtr:int, nbyte:int, errnoPtr:int):int
    {
      var str:String = CModule.readString(bufPtr, nbyte)
      consoleWrite(str)
      return nbyte
    }

    /**
    * The PlayerKernel implementation will use this function to handle
    * C IO read requests to the file "/dev/tty" (e.g. reads from stdin
    * will expect this function to provide the data). See the ISpecialFile
    * documentation for more information about the arguments and return value.
    */
    public function read(fd:int, bufPtr:int, nbyte:int, errnoPtr:int):int
    {
      return 0
    }

    /**
    * The PlayerKernel implementation will use this function to handle
    * C fcntl requests to the file "/dev/tty" 
    * See the ISpecialFile documentation for more information about the
    * arguments and return value.
    */
    public function fcntl(fd:int, com:int, data:int, errnoPtr:int):int
    {
      return 0
    }

    /**
    * The PlayerKernel implementation will use this function to handle
    * C ioctl requests to the file "/dev/tty" 
    * See the ISpecialFile documentation for more information about the
    * arguments and return value.
    */
    public function ioctl(fd:int, com:int, data:int, errnoPtr:int):int
    {
      return 0
    }

    /**
    * Helper function that traces to the flashlog text file and also
    * displays output in the on-screen textfield console.
    */
    protected function consoleWrite(s:String):void
    {
      trace(s)
      if(enableConsole) {
        _tf.appendText(s)
        _tf.scrollV = _tf.maxScrollV
      }
    }

    /**
    * The enterFrame callback will be run once every frame. UI thunk requests should be handled
    * here by calling CModule.serviceUIRequests() (see CModule ASdocs for more information on the UI thunking functionality).
    */
    protected function enterFrame(e:Event):void
    {
      CModule.serviceUIRequests()
    }

    /**
    * Provide a way to get the TextField's text.
    */
    public function get consoleText():String
    {
        var txt:String = null;

        if(_tf != null){
            txt = _tf.text;
        }
        
        return txt;
    }
  }
}