dojo.provide("dojo.lang.array");

dojo.require("dojo.lang.common");

// FIXME: Is this worthless since you can do: if(name in obj)
// is this the right place for this?
dojo.lang.has = function(obj, name){
	try{
		return (typeof obj[name] != "undefined");
	}catch(e){ return false; }
}

dojo.lang.isEmpty = function(obj) {
	if(dojo.lang.isObject(obj)) {
		var tmp = {};
		var count = 0;
		for(var x in obj){
			if(obj[x] && (!tmp[x])){
				count++;
				break;
			} 
		}
		return (count == 0);
	} else if(dojo.lang.isArrayLike(obj) || dojo.lang.isString(obj)) {
		return obj.length == 0;
	}
}

dojo.lang.map = function(arr, obj, unary_func){
	var isString = dojo.lang.isString(arr);
	if(isString){
		arr = arr.split("");
	}
	if(dojo.lang.isFunction(obj)&&(!unary_func)){
		unary_func = obj;
		obj = dj_global;
	}else if(dojo.lang.isFunction(obj) && unary_func){
		// ff 1.5 compat
		var tmpObj = obj;
		obj = unary_func;
		unary_func = tmpObj;
	}
	if(Array.map){
	 	var outArr = Array.map(arr, unary_func, obj);
	}else{
		var outArr = [];
		for(var i=0;i<arr.length;++i){
			outArr.push(unary_func.call(obj, arr[i]));
		}
	}
	if(isString) {
		return outArr.join("");
	} else {
		return outArr;
	}
}

// http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Array:forEach
dojo.lang.forEach = function(anArray /* Array */, callback /* Function */, thisObject /* Object */){
	if(dojo.lang.isString(anArray)){ 
		anArray = anArray.split(""); 
	}
	if(Array.forEach){
		Array.forEach(anArray, callback, thisObject);
	}else{
		// FIXME: there are several ways of handilng thisObject. Is dj_global always the default context?
		if(!thisObject){
			thisObject=dj_global;
		}
		for(var i=0,l=anArray.length; i<l; i++){ 
			callback.call(thisObject, anArray[i], i, anArray);
		}
	}
}

dojo.lang._everyOrSome = function(every, arr, callback, thisObject){
	if(dojo.lang.isString(arr)){ 
		arr = arr.split(""); 
	}
	if(Array.every){
		return Array[ (every) ? "every" : "some" ](arr, callback, thisObject);
	}else{
		if(!thisObject){
			thisObject = dj_global;
		}
		for(var i=0,l=arr.length; i<l; i++){
			var result = callback.call(thisObject, arr[i], i, arr);
			if((every)&&(!result)){
				return false;
			}else if((!every)&&(result)){
				return true;
			}
		}
		return (every) ? true : false;
	}
}

dojo.lang.every = function(arr, callback, thisObject){
	return this._everyOrSome(true, arr, callback, thisObject);
}

dojo.lang.some = function(arr, callback, thisObject){
	return this._everyOrSome(false, arr, callback, thisObject);
}

dojo.lang.filter = function(arr, callback, thisObject) {
	var isString = dojo.lang.isString(arr);
	if(isString) { arr = arr.split(""); }
	if(Array.filter) {
		var outArr = Array.filter(arr, callback, thisObject);
	} else {
		if(!thisObject) {
			if(arguments.length >= 3) { dojo.raise("thisObject doesn't exist!"); }
			thisObject = dj_global;
		}

		var outArr = [];
		for(var i = 0; i < arr.length; i++) {
			if(callback.call(thisObject, arr[i], i, arr)) {
				outArr.push(arr[i]);
			}
		}
	}
	if(isString) {
		return outArr.join("");
	} else {
		return outArr;
	}
}

/**
 * Creates a 1-D array out of all the arguments passed,
 * unravelling any array-like objects in the process
 *
 * Ex:
 * unnest(1, 2, 3) ==> [1, 2, 3]
 * unnest(1, [2, [3], [[[4]]]]) ==> [1, 2, 3, 4]
 */
dojo.lang.unnest = function(/* ... */) {
	var out = [];
	for(var i = 0; i < arguments.length; i++) {
		if(dojo.lang.isArrayLike(arguments[i])) {
			var add = dojo.lang.unnest.apply(this, arguments[i]);
			out = out.concat(add);
		} else {
			out.push(arguments[i]);
		}
	}
	return out;
}

/**
 * Converts an array-like object (i.e. arguments, DOMCollection)
 * to an array
**/
dojo.lang.toArray = function(arrayLike, startOffset) {
	var array = [];
	for(var i = startOffset||0; i < arrayLike.length; i++) {
		array.push(arrayLike[i]);
	}
	return array;
}
