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/**
 * 动画主控制器
 * @config target 动画对象，可以是数组，如果是数组的话会批量分发onframe等事件
 * @config life(1000) 动画时长
 * @config delay(0) 动画延迟时间
 * @config loop(true)
 * @config gap(0) 循环的间隔时间
 * @config onframe
 * @config easing(optional)
 * @config ondestroy(optional)
 * @config onrestart(optional)
 */
define(
    function(require) {

        var Easing = require('./easing');

        function Clip(options) {

            this._targetPool = options.target || {};
            if (!(this._targetPool instanceof Array)) {
                this._targetPool = [ this._targetPool ];
            }

            // 生命周期
            this._life = options.life || 1000;
            // 延时
            this._delay = options.delay || 0;
            // 开始时间
            this._startTime = new Date().getTime() + this._delay;// 单位毫秒

            // 结束时间
            this._endTime = this._startTime + this._life * 1000;

            // 是否循环
            this.loop = typeof options.loop == 'undefined'
                        ? false : options.loop;

            this.gap = options.gap || 0;

            this.easing = options.easing || 'Linear';

            this.onframe = options.onframe;
            this.ondestroy = options.ondestroy;
            this.onrestart = options.onrestart;
        }

        Clip.prototype = {
            step : function (time) {
                var percent = (time - this._startTime) / this._life;

                // 还没开始
                if (percent < 0) {
                    return;
                }

                percent = Math.min(percent, 1);

                var easingFunc = typeof this.easing == 'string'
                                 ? Easing[this.easing]
                                 : this.easing;
                var schedule = typeof easingFunc === 'function'
                    ? easingFunc(percent)
                    : percent;

                this.fire('frame', schedule);

                // 结束
                if (percent == 1) {
                    if (this.loop) {
                        this.restart();
                        // 重新开始周期
                        // 抛出而不是直接调用事件直到 stage.update 后再统一调用这些事件
                        return 'restart';
                    }
                    
                    // 动画完成将这个控制器标识为待删除
                    // 在Animation.update中进行批量删除
                    this._needsRemove = true;
                    return 'destroy';
                }
                
                return null;
            },
            restart : function() {
                var time = new Date().getTime();
                var remainder = (time - this._startTime) % this._life;
                this._startTime = new Date().getTime() - remainder + this.gap;

                this._needsRemove = false;
            },
            fire : function(eventType, arg) {
                for (var i = 0, len = this._targetPool.length; i < len; i++) {
                    if (this['on' + eventType]) {
                        this['on' + eventType](this._targetPool[i], arg);
                    }
                }
            },
            constructor: Clip
        };

        return Clip;
    }
);