var Object = require('./object');
var Value = require('./value');

/**
 * A map container for many Sql.Object
 */
module.exports = new Class
({
	Extends: Object
	,Tag: 'sql-batch'
	,Properties:
	{
		blocked:
		{
			type: Boolean
			,set: function(x) {
				this._blocked = x;
			}
			,get: function() {
				return this._blocked;
			}
		}
	}

	,objects: {}
	,_blocked: false

	,loadXml: function(scope, node) {
		this.parent(scope, node);

		var childs = node.childNodes;
	
		for (var i = 0; i < childs.length; i++)
		if (childs[i].tagName && childs[i].tagName.toLowerCase() == 'item') {
			var object;
			var id = childs[i].getAttribute('name');

			if (id) {
				if (object = scope.getById(childs[i].getAttribute('param')))
					this.addParam(id, object);
				else if (object = scope.getById(childs[i].getAttribute('object')))
					this.addObject(id, object);
			}
		}
	}
	
	,get: function(id) {
		if (this.objects[id])
			return this.objects[id];
			
		return null;
	}
	
	,add: function(id) {
		if (!this.objects[id])
			this.objects[id] = null;
	}
	
	,_addObject: function(id, object) {
		this.remove(id);
		this.objects[id] = object;
		object.on('changed', this.emitChanged, this);
		this.emitChanged();
	}

	,addObject: function(id, object) {
		this._addObject(id, object.ref());
	}

	,addValue: function(id, value) {
		this._addObject(id,
			new Value({value: value}));
	}
	
	,addValues: function(values) {
		for (var id in values)
			this.addValue(id, values[id]);
	}

	,addParam: function(id, param) {
		this._addObject(id,
			new Value({param: param}));
	}
	
	,getValue: function(id) {
		var object = this.objects[id];
		
		if (object instanceof Value)
			return object.value;
			
		return null;
	}
	
	,addParams: function(params) {
		for (var id in params)
			this.addParam(id, params[id]);
	}
	
	,remove: function(id) {
		if (this.objects[id]) {
			this._unrefObject(this.objects[id]);
			delete this.objects[id];
		}
	}

	,block: function() {
		this._blocked = true;
	}

	,unblock: function() {
		this._blocked = false;
	}
	
	,emitChanged: function() {
		if (!this._blocked)
			this.signalEmit('changed');
	}

	,changed: function() {
		this.signalEmit('changed');
	}

	,isReady: function() {
		for (var id in this.objects)
		if (!(this.objects[id] && this.objects[id].isReady()))
			return false;

		return true;
	}
	
	,_unrefObject: function(object) {
		if (object) {
			object.disconnect('changed', this.emitChanged, this);
			object.unref();
		}
	}
	
	,_destroy: function() {
		for (var id in this.objects)
			this._unrefObject(this.objects[id]);

		this.parent();
	}
});