var Angle = require('../math/angle/Between'); 
var Class = require('../utils/Class'); 
var Distance = require('../math/distance/DistanceBetween'); 
var FuzzyEqual = require('../math/fuzzy/Equal'); 
var SmoothStepInterpolation = require('../math/interpolation/SmoothStepInterpolation'); 
var Vector2 = require('../math/Vector2'); 
var Pointer = new Class({ 
initialize: function Pointer(manager, id){ 
this.manager = manager; 
this.id = id; 
this.event; 
this.downElement; 
this.upElement; 
this.camera = null ; 
this.buttons = 0; 
this.position = new Vector2(); 
this.prevPosition = new Vector2(); 
this.midPoint = new Vector2(-1, -1); 
this.velocity = new Vector2(); 
this.angle = 0; 
this.distance = 0; 
this.smoothFactor = 0; 
this.motionFactor = 0.2; 
this.worldX = 0; 
this.worldY = 0; 
this.moveTime = 0; 
this.downX = 0; 
this.downY = 0; 
this.downTime = 0; 
this.upX = 0; 
this.upY = 0; 
this.upTime = 0; 
this.primaryDown = false ; 
this.isDown = false ; 
this.dirty = false ; 
this.justDown = false ; 
this.justUp = false ; 
this.justMoved = false ; 
this.wasTouch = false ; 
this.wasCanceled = false ; 
this.movementX = 0; 
this.movementY = 0; 
this.identifier = 0; 
this.pointerId = null ; 
this.active = (id === 0)? true : false ; 
this.time = 0; 
} 
,
positionToCamera: function (camera, output){ 
return camera.getWorldPoint(this.x, this.y, output); 
} 
,
reset: function (time){ 
this.dirty = false ; 
this.justDown = false ; 
this.justUp = false ; 
this.justMoved = false ; 
this.time = time; 
this.movementX = 0; 
this.movementY = 0; 
} 
,
updateMotion: function (){ 
var cx = this.position.x; 
var cy = this.position.y; 
var mx = this.midPoint.x; 
var my = this.midPoint.y; 
if (cx === mx && cy === my) { 
return ; 
} 
var vx = SmoothStepInterpolation(this.motionFactor, mx, cx); 
var vy = SmoothStepInterpolation(this.motionFactor, my, cy); 
if (FuzzyEqual(vx, cx, 0.1)) { 
vx = cx; 
} 
if (FuzzyEqual(vy, cy, 0.1)) { 
vy = cy; 
} 
this.midPoint.set(vx, vy); 
var dx = cx - vx; 
var dy = cy - vy; 
this.velocity.set(dx, dy); 
this.angle = Angle(vx, vy, cx, cy); 
this.distance = Math.sqrt(dx * dx + dy * dy); 
} 
,
up: function (event, time){ 
if (event.buttons) { 
this.buttons = event.buttons; 
} 
this.event = event; 
this.upElement = _AN_Read_target('target', event); 
this.manager.transformPointer(this, event.pageX, event.pageY, false ); 
if (event.button === 0) { 
this.primaryDown = false ; 
this.upX = this.x; 
this.upY = this.y; 
this.upTime = time; 
} 
this.justUp = true ; 
this.isDown = false ; 
this.dirty = true ; 
this.wasTouch = false ; 
} 
,
down: function (event, time){ 
if (event.buttons) { 
this.buttons = event.buttons; 
} 
this.event = event; 
this.downElement = _AN_Read_target('target', event); 
this.manager.transformPointer(this, event.pageX, event.pageY, false ); 
if (event.button === 0) { 
this.primaryDown = true ; 
this.downX = this.x; 
this.downY = this.y; 
this.downTime = time; 
} 
this.justDown = true ; 
this.isDown = true ; 
this.dirty = true ; 
this.wasTouch = false ; 
} 
,
move: function (event, time){ 
if (event.buttons) { 
this.buttons = event.buttons; 
} 
this.event = event; 
this.manager.transformPointer(this, event.pageX, event.pageY, true ); 
if (this.manager.mouse.locked) { 
this.movementX += event.movementX || event.mozMovementX || event.webkitMovementX || 0; 
this.movementY += event.movementY || event.mozMovementY || event.webkitMovementY || 0; 
} 
this.justMoved = true ; 
this.moveTime = time; 
this.dirty = true ; 
this.wasTouch = false ; 
} 
,
touchstart: function (event, time){ 
if (event.pointerId) { 
this.pointerId = event.pointerId; 
} 
this.identifier = event.identifier; 
_AN_Write_target('target', this, false , _AN_Read_target('target', event)); 
this.active = true ; 
this.buttons = 1; 
this.event = event; 
this.downElement = _AN_Read_target('target', event); 
this.manager.transformPointer(this, event.pageX, event.pageY, false ); 
this.primaryDown = true ; 
this.downX = this.x; 
this.downY = this.y; 
this.downTime = time; 
this.justDown = true ; 
this.isDown = true ; 
this.dirty = true ; 
this.wasTouch = true ; 
this.wasCanceled = false ; 
} 
,
touchmove: function (event, time){ 
this.event = event; 
this.manager.transformPointer(this, event.pageX, event.pageY, true ); 
this.justMoved = true ; 
this.moveTime = time; 
this.dirty = true ; 
this.wasTouch = true ; 
} 
,
touchend: function (event, time){ 
this.buttons = 0; 
this.event = event; 
this.upElement = _AN_Read_target('target', event); 
this.manager.transformPointer(this, event.pageX, event.pageY, false ); 
this.primaryDown = false ; 
this.upX = this.x; 
this.upY = this.y; 
this.upTime = time; 
this.justUp = true ; 
this.isDown = false ; 
this.dirty = true ; 
this.wasTouch = true ; 
this.wasCanceled = false ; 
this.active = false ; 
} 
,
touchcancel: function (event){ 
this.buttons = 0; 
this.event = event; 
this.primaryDown = false ; 
this.justUp = false ; 
this.isDown = false ; 
this.dirty = true ; 
this.wasTouch = true ; 
this.wasCanceled = true ; 
this.active = false ; 
} 
,
noButtonDown: function (){ 
return (this.buttons === 0); 
} 
,
leftButtonDown: function (){ 
return (this.buttons & 1); 
} 
,
rightButtonDown: function (){ 
return (this.buttons & 2); 
} 
,
middleButtonDown: function (){ 
return (this.buttons & 4); 
} 
,
backButtonDown: function (){ 
return (this.buttons & 8); 
} 
,
forwardButtonDown: function (){ 
return (this.buttons & 16); 
} 
,
getDistance: function (){ 
if (this.isDown) { 
return Distance(this.downX, this.downY, this.x, this.y); 
} 
 else { 
return Distance(this.downX, this.downY, this.upX, this.upY); 
} 
} 
,
getDistanceX: function (){ 
if (this.isDown) { 
return Math.abs(this.downX - this.x); 
} 
 else { 
return Math.abs(this.downX - this.upX); 
} 
} 
,
getDistanceY: function (){ 
if (this.isDown) { 
return Math.abs(this.downY - this.y); 
} 
 else { 
return Math.abs(this.downY - this.upY); 
} 
} 
,
getDuration: function (){ 
if (this.isDown) { 
return (this.time - this.downTime); 
} 
 else { 
return (this.upTime - this.downTime); 
} 
} 
,
getAngle: function (){ 
if (this.isDown) { 
return Angle(this.downX, this.downY, this.x, this.y); 
} 
 else { 
return Angle(this.downX, this.downY, this.upX, this.upY); 
} 
} 
,
getInterpolatedPosition: function (steps, out){ 
if (steps === undefined) { 
steps = 10; 
} 
if (out === undefined) { 
out = [] ; 
} 
var prevX = this.prevPosition.x; 
var prevY = this.prevPosition.y; 
var curX = this.position.x; 
var curY = this.position.y; 
for (var i = 0; 
i < steps; i++ ){ 
var t = (1 / steps) * i; 
out[i] = { 
x: SmoothStepInterpolation(t, prevX, curX),
y: SmoothStepInterpolation(t, prevY, curY)}
; 
} 
return out; 
} 
,
destroy: function (){ 
this.camera = null ; 
this.manager = null ; 
this.position = null ; 
} 
,
x: { 
get: function (){ 
return this.position.x; 
} 
,
set: function (value){ 
this.position.x = value; 
} 
}
,
y: { 
get: function (){ 
return this.position.y; 
} 
,
set: function (value){ 
this.position.y = value; 
} 
}
}
); 
module.exports = Pointer;