// RichFaces.utils
// RichFaces.utils.cache
(function ($, rf) {
	rf.utils = rf.utils || {};

	rf.utils.Cache = function (key, items, values, useCache) {
		this.key = key.toLowerCase();
		this.cache = {};
		this.cache[this.key] = items || [];
		this.originalValues = typeof values == "function" ? values(items) : values || this.cache[this.key];
		this.values = processValues(this.originalValues);
		this.useCache = useCache || checkValuesPrefix.call(this);
	};
	
	var processValues = function (values) {
		var processedValues = [];
		for (var i = 0; i<values.length; i++) {
			processedValues.push(values[i].toLowerCase());
		}
		return processedValues;
	};
	
	var checkValuesPrefix = function () {
		var result = true;
		for (var i = 0; i<this.values.length; i++) {
			if (this.values[i].indexOf(this.key)!=0) {
				result = false;
				break;
			}
		}
		return result;
	};

	var getItems = function (key, filterFunction) {
		key = key.toLowerCase();
		var newCache = [];
		
		if (key.length < this.key.length) {
			return newCache;
		}

		if (this.cache[key]) {
			newCache = this.cache[key];
		} else {
			var useCustomFilterFunction = typeof filterFunction == "function";
			var itemsCache = this.cache[this.key];
			for (var i = 0; i<this.values.length; i++) {
				var value = this.values[i];
				if (useCustomFilterFunction && filterFunction(key, value)) {
					newCache.push(itemsCache[i]);
				} else {
					var p = value.indexOf(key);
					if (p == 0) {
						newCache.push(itemsCache[i]);
					}
				}
			}

			if ((!this.lastKey || key.indexOf(this.lastKey)!=0) && newCache.length > 0) {
				this.cache[key] = newCache;
				if (newCache.length==1) {
					this.lastKey = key;
				}
			}
		}

		return newCache;
	};
	
	var getItemValue = function (item) {
		return this.originalValues[this.cache[this.key].index(item)];
	};
	
	var isCached = function (key) {
		key = key.toLowerCase();
		return this.cache[key] || this.useCache && key.indexOf(this.key)==0;
	};

	$.extend(rf.utils.Cache.prototype, (function () {
		return  {
			getItems: getItems,
			getItemValue: getItemValue,
			isCached: isCached
		};
	})());

})(jQuery, RichFaces);