var Object = require('./object');
var Param = require('./param');
var Hash = require('./hash');

module.exports = new Class({
	Extends: Object
	,Tag: 'vn-hash-param'
	,Child: 'param'
	,Properties: {
		param: {
			type: Param
			,set: function(x) {
				this.link({_param: x}, {'changed': this._onParamChange});
				this._refreshParam();
			}
			,get: function() {
				return this._param;
			}
		},
		key: {
			type: String
			,set: function(x) {
				this._key = x;
				this._onHashChange();
			}
			,get: function() {
				return this._key;
			}
		},
		value: {
			type: Object
			,set: function(x) {
				this._setValue(x, true);
			}
			,get: function() {
				return this._value;
			}
		},
		type: {
			type: Object
			,set: function(x) {
				this._type = x;
				this._onHashChange();
			}
			,get: function() {
				return this._type;
			}
		}
	}
	
	,_hashLock: false
	,_paramLock: false
	,_value: undefined
	,_key: null
	,_type: null
	
	,initialize: function(props) {
		this.parent(props);
		var listener = Hash.getListener();
		this.link({_listener: listener}, {'changed': this._onHashChange});
		this._onHashChange();
	}

	,_onHashChange: function() {	
		if (this._hashLock || !this._key || !this._listener)
			return;

		var newValue = Hash.get(this._key);
		
		if (newValue === '')
			newValue = null;
		
		if (this._type && newValue !== undefined && newValue !== null)
		switch (this._type) {
			case Boolean:
				newValue = (/^(true|1)$/i).test(newValue);
				break;
			case Number:
				newValue = 0 + new Number(newValue);
				break;
		}

		this._hashLock = true;
		this._setValue(newValue, true);
		this._hashLock = false;
	}
	
	,_setValue: function(newValue, signal) {
		if (newValue == this._value)
			return;

		this._value = newValue;

		if (this._key && !this._hashLock) {
			this._hashLock = true;

			var map = {};
			map[this._key] = newValue;
			Hash.add(map);

			this._hashLock = false;
		}
		
		this._refreshParam();
		
		if (signal)
			this.signalEmit('changed', newValue);
	}

	,_refreshParam: function() {
		if (this._param && !this._paramLock) {
			this._paramLock = true;
			this._param.value = this._value;
			this._paramLock = false;
		}
	}
	
	,_onParamChange: function() {
		if (this._paramLock)
			return;

		this._paramLock = true;
		this._setValue(this._param.value);
		this._paramLock = false;
	}
});