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###
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  TouchController (stick + buttons) for touch devices
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  Based on the touch demo by Seb Lee-Delisle <http://seb.ly/>
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  @class bkcore.controllers.TouchController
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  @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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###
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class TouchController
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  @isCompatible: ->
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    return ('ontouchstart' of document.documentElement);
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  ###
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    Creates a new TouchController
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    @param dom DOMElement The element that will listen to touch events
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    @param stickMargin int The left margin in px for stick detection
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    @param buttonCallback function Callback for non-stick touches
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  ###
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  constructor: (@dom, @stickMargin=200, @buttonCallback=null) ->
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    @active = true
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    @touches = null
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    @stickID = -1
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    @stickPos = new Vec2(0, 0)
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    @stickStartPos = new Vec2(0, 0)
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    @stickVector = new Vec2(0, 0)
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    @dom.addEventListener('touchstart', ((e)=> @touchStart(e)), false)
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    @dom.addEventListener('touchmove', ((e)=> @touchMove(e)), false)
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    @dom.addEventListener('touchend', ((e)=> @touchEnd(e)), false)
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  ###
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    @private
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  ###
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  touchStart: (event) ->
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    return if not @active
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    for touch in event.changedTouches
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      if @stickID < 0 and touch.clientX < @stickMargin
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        @stickID = touch.identifier
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        @stickStartPos.set(touch.clientX, touch.clientY)
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        @stickPos.copy(@stickStartPos)
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        @stickVector.set(0, 0)
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        continue
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      else
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        @buttonCallback?(on, touch, event)
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    @touches = event.touches
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    false
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  ###
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    @private
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  ###
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  touchMove: (event) ->
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    event.preventDefault()
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    return if not @active
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    for touch in event.changedTouches
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      if @stickID is touch.identifier and touch.clientX < @stickMargin
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        @stickPos.set(touch.clientX, touch.clientY)
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        @stickVector.copy(@stickPos).substract(@stickStartPos)
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        break
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    @touches = event.touches
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    false
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  ###
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    @private
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  ###
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  touchEnd: (event) ->
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    return if not @active
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    @touches = event.touches
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    for touch in event.changedTouches
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      if @stickID is touch.identifier
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        @stickID = -1
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        @stickVector.set(0, 0)
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        break
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      else
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        @buttonCallback?(off, touch, event)
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    false
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###
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  Internal class used for vector2
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  @class Vec2
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  @private
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###
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class Vec2
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  constructor: (@x = 0, @y = 0) ->
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  substract: (vec) ->
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    @x -= vec.x
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    @y -= vec.y
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    @
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  copy: (vec) ->
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    @x = vec.x
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    @y = vec.y
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    @
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  set: (x, y) ->
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    @x = x
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    @y = y
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    @
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###
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  Exports
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  @package bkcore
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###
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exports = exports ? @
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exports.bkcore ||= {}
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exports.bkcore.controllers ||= {}
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exports.bkcore.controllers.TouchController = TouchController
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