/*global Quintus:false */

Quintus.Anim = function(Q) {

  Q._animations = {};
  Q.animations = function(sprite,animations) {
    if(!Q._animations[sprite]) { Q._animations[sprite] = {}; }
    Q._extend(Q._animations[sprite],animations);
  };

  Q.animation = function(sprite,name) {
    return Q._animations[sprite] && Q._animations[sprite][name];
  };

  Q.component('animation',{
    added: function() {
      var p = this.entity.p;
      p.animation = null;
      p.animationPriority = -1;
      p.animationFrame = 0;
      p.animationTime = 0;
      this.entity.on("step",this,"step");
    },
    extend: {
      play: function(name,priority) {
        this.animation.play(name,priority);
      }
    },
    step: function(dt) {
      var entity = this.entity,
          p = entity.p;
      if(p.animation) {
        var anim = Q.animation(p.sprite,p.animation),
            rate = anim.rate || p.rate,
            stepped = 0;
        p.animationTime += dt;
        if(p.animationChanged) {
          p.animationChanged = false;
        } else { 
          p.animationTime += dt;
          if(p.animationTime > rate) {
            stepped = Math.floor(p.animationTime / rate);
            p.animationTime -= stepped * rate;
            p.animationFrame += stepped;
          }
        }
        if(stepped > 0) {
          if(p.animationFrame >= anim.frames.length) {
            if(anim.loop === false || anim.next) {
              p.animationFrame = anim.frames.length - 1;
              entity.trigger('animEnd');
              entity.trigger('animEnd.' + p.animation);
              p.animation = null;
              p.animationPriority = -1;
              if(anim.trigger) {  
                entity.trigger(anim.trigger,anim.triggerData);
              }
              if(anim.next) { this.play(anim.next,anim.nextPriority); }
              return;
            } else {
              entity.trigger('animLoop');
              entity.trigger('animLoop.' + p.animation);
              p.animationFrame = p.animationFrame % anim.frames.length;
            }
          }
          entity.trigger("animFrame");
        }
        p.sheet = anim.sheet || p.sheet;
        p.frame = anim.frames[p.animationFrame];
      }
    },

    play: function(name,priority) {
      var entity = this.entity,
          p = entity.p;
      priority = priority || 0;
      if(name !== p.animation && priority >= p.animationPriority) {
        p.animation = name;
        p.animationChanged = true;
        p.animationTime = 0;
        p.animationFrame = 0;
        p.animationPriority = priority;
        entity.trigger('anim');
        entity.trigger('anim.' + p.animation);
      }
    }
  
  });


  Q.Sprite.extend("Repeater",{
    init: function(props) {
      this._super(Q._defaults(props,{
        speedX: 1,
        speedY: 1,
        repeatY: true,
        repeatX: true
      }));
      this.p.repeatW = this.p.repeatW || this.p.w;
      this.p.repeatH = this.p.repeatH || this.p.h;
    },

    draw: function(ctx) {
      var p = this.p,
          asset = this.asset(),
          sheet = this.sheet(),
          scale = this.parent.viewport ? this.parent.viewport.scale : 1,
          viewX = this.parent.viewport ? this.parent.viewport.x : 0,
          viewY = this.parent.viewport ? this.parent.viewport.y : 0,
          offsetX = p.x + viewX * this.p.speedX,
          offsetY = p.y + viewY * this.p.speedY,
          curX, curY, startX;
      if(p.repeatX) {
        curX = Math.floor(-offsetX % p.repeatW);
        if(curX > 0) { curX -= p.repeatW; }
      } else {
        curX = p.x - viewX;
      }
      if(p.repeatY) {
        curY = Math.floor(-offsetY % p.repeatH);
        if(curY > 0) { curY -= p.repeatH; }
      } else {
        curY = p.y - viewY;
      }
      startX = curX;
      while(curY < Q.height / scale) {
        curX = startX;
        while(curX < Q.width / scale) {
          if(sheet) {
            sheet.draw(ctx,Math.floor(curX + viewX), Math.floor(curY + viewY),p.frame);
          } else {
            ctx.drawImage(asset,Math.floor(curX + viewX),Math.floor(curY + viewY));
          }
          curX += p.repeatW;
          if(!p.repeatX) { break; }
        }
        curY += p.repeatH;
        if(!p.repeatY) { break; }
      }
    }
  });

  Q.Tween = Q.Class.extend({
    init: function(entity,properties,duration,easing,options) {
      if(Q._isObject(easing)) { options = easing; easing = Q.Easing.Linear }
      if(Q._isObject(duration)) { options = duration; duration = 1 }

      this.entity = entity;
      this.p = (entity instanceof Q.Stage) ? entity.viewport : entity.p;
      this.duration = duration || 1;
      this.time = 0;
      this.options = options || {};
      this.delay = this.options.delay || 0;
      this.easing = easing || this.options.easing || Q.Easing.Linear;


      this.startFrame = Q._loopFrame + 1;
      this.start = {};
      this.diff = {};
      for(var property in properties) {
        this.start[property] = this.p[property];
        if(!Q._isUndefined(this.start[property])) {
          this.diff[property] = properties[property] - this.start[property];
        }
      }
    },

    step: function(dt) {
      if(this.startFrame > Q._loopFrame) return true; 
      if(this.delay >= dt) {
        this.delay -= dt;
        return true;
      }

      if(this.delay > 0) {
        dt -= this.delay;
        this.delay = 0;
      }

      this.time += dt;

      var progress = Math.min(1,this.time / this.duration),
          location = this.easing(progress);

      for(var property in this.start) {
        if(!Q._isUndefined(this.p[property])) {
          this.p[property] = this.start[property] + this.diff[property] * location;
        }
      }

      if(progress >= 1) {
        if(this.options.callback) { 
          this.options.callback.apply(this.entity);
        }
      }
      return progress < 1;
    }
  });

  // Code ripped directly from Tween.js
  // https://github.com/sole/tween.js/blob/master/src/Tween.js
  Q.Easing = {
    Linear: function (k) { return k; },

    Quadratic: {
      In: function ( k )  { return k * k; },
      Out: function ( k ) {return k * ( 2 - k ); },
      InOut: function ( k ) {
        if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
        return - 0.5 * ( --k * ( k - 2 ) - 1 );
      }
    }
  };

  Q.component('tween',{
    added: function() {
      this._tweens = [];
      this.entity.on("step",this,"step");
    },
    extend: {
      animate: function(properties,duration,easing,options) {
        this.tween._tweens.push(new Q.Tween(this,properties,duration,easing,options));
        return this;
      },

      chain: function(properties,duration,easing,options) {
        if(Q._isObject(easing)) { options = easing; easing = Q.Easing.Linear }
        // Chain an animation to the end
        var tweenCnt = this.tween._tweens.length;
        if(this.tweenCnt > 0) {
          var lastTween = this.tween._tweens[tweenCnt - 1];
          options = options || {};
          options['delay'] = lastTween.duration - lastTween.time + lastTween.delay;
        } 

        this.animate(properties,duration,easing,options);
        return this;
      },

      stop: function() {
        this.tween._tweens.length = 0;
        return this;
      }
    },

    step: function(dt) {
      for(var i=this._tweens.length-1;i>=0;i--) {
        if(!this._tweens[i].step(dt)) {
          this._tweens.splice(i,1);
        }
      }
    }
  });


};