var Gallery = function() {
	var instance = this;

	this.stages = {};
	this.initStatus = {};
	this.storage = Storage;

	$('.backBtn').click(function() {
		Statistics.trigger(19, (new Gallery()).getCurrentStage());
		(new Gallery()).backTo($(this).attr('_backTo'), $(this).attr('_backWhole') == 'true');
	});
	$('.closeBtn').click(function() {
		Statistics.trigger(35, (new Gallery()).getCurrentStage());
		window.close();
	});

	this.currentHeader = $('[_header]', $('.wrap'));
	this.newHeader = this.currentHeader.clone(true, true);
	this.mask = $('#mask');

	Gallery = function() {
		return instance;
	};
};

Gallery.prototype.addStage = function(name, config) {
	this.stages[name] = config;
	this.initStatus[name] = false;

	if (this.stages[name].deamon) {
		this.stages[name].deamon();
	}
	return this;
};

Gallery.prototype.prepare = function(name, context) {
	if (this.initStatus[name] === false) {
		if (this.stages[name].init !== undefined) {
			this.stages[name].init();
		}
		this.initStatus[name] = true;
	}

	if (this.stages[name].prepare !== undefined) {
		this.stages[name].prepare(context);
	}
};

Gallery.prototype.moveTo = function(name, whole, context, direction) {
	var directionFlag = (direction === '-' ? 'Go' : 'Back'),
		header,
		oldHeader,
		oldStageName = this.currentStage;

	if (arguments[1] === undefined) {
		whole = false;
	}

	if (whole) {
		this.newHeader.css('left', '').addClass('prepareTo' + directionFlag).show();
		oldHeader = this.currentHeader;
		oldHeader.css('left', '').addClass('readyTo' + directionFlag);
		this.newHeader.prependTo('.wrap');
		this.currentHeader = this.newHeader;
		this.newHeader = oldHeader;
	}
	this.fillHeader(this.currentHeader, name);

	$('.main[_stage=' + this.currentStage + ']').addClass('readyTo' + directionFlag);
	$('.main[_stage=' + name + ']').addClass('prepareTo' + directionFlag).show();

	$('#cover').show();
	$('.readyTo' + directionFlag + ',.prepareTo' + directionFlag).animate(
		{left: direction + '=340px'},
		'slow',
		'',
		function() {
			var newStage = (new Gallery()).getStages()[name];
				oldStage = (new Gallery()).getStages()[oldStageName];

			if ($(this).hasClass('readyTo' + directionFlag)) {
				$(this).removeClass('readyTo' + directionFlag).hide();
			}

			if ($(this).hasClass('prepareTo' + directionFlag)) {
				$(this).removeClass('prepareTo' + directionFlag);
			}
			$(this).css('left', '');

			if ($(this).hasClass(name)) {
				$('#cover').hide();
			}

			//切换到之后执行
			if ($(this).hasClass(name) && newStage.showed !== undefined) {
				newStage.showed(context);
			};

			//送走的场景
			if ($(this).hasClass(oldStageName) && oldStage.gone !== undefined) {
				oldStage.gone(context);
			}
		}
	);

	this.prepare(name, context);
	this.currentStage = name;

	if (!this.stages[this.currentStage].temp) {
		this.storage.set('lastStage', this.currentStage);
	}
	return this;
};

Gallery.prototype.goTo = function(name, whole, context) {
	return this.moveTo(name, whole, context, '-');
}

Gallery.prototype.backTo = function(name, whole, context) {
	return this.moveTo(name, whole, context, '+');
}

Gallery.prototype.initShow = function(name, context) {
	this.prepare(name, context);
	this.fillHeader($('[_header]'), name);

	$('.main[_stage!=' + name + ']').hide();
	$('.main[_stage=' + name + ']').show();
	
	this.currentStage = name;
	if (this.stages[name].showed !== undefined) {
		this.stages[name].showed(context);
	};
};

Gallery.prototype.fillHeader = function(header, name) {
	Filler.fill(
		header,
		this.stages[name].header,
		{
			prevStage: function(data, element) {
				if (data.prevStage === undefined) {
					element.hide();
				} else {
					element.show();
				}
				return data.prevStage;
			},
			backWhole: function(data) {
				if (data.backWhole === undefined || data.backWhole === false) {
					return 'false';
				}
				return 'true';
			}
		}
	);
};

Gallery.prototype.getStages = function() {
	return this.stages;
};

Gallery.prototype.getCurrentStage = function() {
	return this.currentStage;
};

Gallery.prototype.showMask = function() {
	this.mask.show();
	return this;
};

Gallery.prototype.hideMask = function() {
	this.mask.hide();
	return this;
};