/**
 * @author Ryan Johnson <http://syntacticx.com/>
 * @copyright 2008 PersonalGrid Corporation <http://personalgrid.com/>
 * @package LivePipe UI
 * @license MIT
 * @url http://livepipe.net/control/textarea
 * @require prototype.js, livepipe.js
 */

/*global window, document, Prototype, Class, $, $A, Control */

if(typeof(Prototype) == "undefined") {
	throw "Control.TextArea requires Prototype to be loaded."; }
if(typeof(Object.Event) == "undefined") {
	throw "Control.TextArea requires Object.Event to be loaded."; }

Control.TextArea = Class.create({
	initialize: function(textarea){
		this.onChangeTimeout = false;
		this.element = $(textarea);
		$(this.element).observe('keyup',this.doOnChange.bindAsEventListener(this));
		$(this.element).observe('paste',this.doOnChange.bindAsEventListener(this));
		$(this.element).observe('input',this.doOnChange.bindAsEventListener(this));
		if(!!document.selection){
			$(this.element).observe('mouseup',this.saveRange.bindAsEventListener(this));  
			$(this.element).observe('keyup',this.saveRange.bindAsEventListener(this));
		}
	},
	doOnChange: function(event){
		if(this.onChangeTimeout) {
			window.clearTimeout(this.onChangeTimeout); }
		this.onChangeTimeout = window.setTimeout(function(){
			this.notify('change',this.getValue());
		}.bind(this),Control.TextArea.onChangeTimeoutLength);
	},
	saveRange: function(){
		this.range = document.selection.createRange();  
	},
	getValue: function(){
		return this.element.value;
	},
	getSelection: function(){
		if(!!document.selection) {
			return document.selection.createRange().text; }
		else if(!!this.element.setSelectionRange) {
			return this.element.value.substring(this.element.selectionStart,this.element.selectionEnd); }
		else {
			return false; }
	},
	replaceSelection: function(text){
		var scroll_top = this.element.scrollTop;
		if(!!document.selection){
			this.element.focus();
			var range = (this.range) ? this.range : document.selection.createRange();
			range.text = text;
			range.select();
		}else if(!!this.element.setSelectionRange){
			var selection_start = this.element.selectionStart;
			this.element.value = this.element.value.substring(0,selection_start) + text + this.element.value.substring(this.element.selectionEnd);
			this.element.setSelectionRange(selection_start + text.length,selection_start + text.length);
		}
		this.doOnChange();
		this.element.focus();
		this.element.scrollTop = scroll_top;
	},
	wrapSelection: function(before,after){
        var sel = this.getSelection();
        // Remove the wrapping if the selection has the same before/after
        if (sel.indexOf(before) === 0 && 
            sel.lastIndexOf(after) === (sel.length - after.length)) {
            this.replaceSelection(sel.substring(before.length, 
                sel.length - after.length));
        } else { this.replaceSelection(before + sel + after); }
	},
	insertBeforeSelection: function(text){
		this.replaceSelection(text + this.getSelection());
	},
	insertAfterSelection: function(text){
		this.replaceSelection(this.getSelection() + text);
	},
	collectFromEachSelectedLine: function(callback,before,after){
		this.replaceSelection((before || '') + $A(this.getSelection().split("\n")).collect(callback).join("\n") + (after || ''));
	},
	insertBeforeEachSelectedLine: function(text,before,after){
		this.collectFromEachSelectedLine(function(line){
		},before,after);
	}
});
Object.extend(Control.TextArea,{
	onChangeTimeoutLength: 500
});
Object.Event.extend(Control.TextArea);

Control.TextArea.ToolBar = Class.create(	{
	initialize: function(textarea,toolbar){
		this.textarea = textarea;
		if(toolbar) {
			this.container = $(toolbar); }
		else{
			this.container = $(document.createElement('ul'));
			this.textarea.element.parentNode.insertBefore(this.container,this.textarea.element);
		}
	},
	attachButton: function(node,callback){
        node.onclick = function(){return false;};
		$(node).observe('click',callback.bindAsEventListener(this.textarea));
	},
	addButton: function(link_text,callback,attrs){
		var li = document.createElement('li');
		var a = document.createElement('a');
		a.href = '#';
		this.attachButton(a,callback);
		li.appendChild(a);
		Object.extend(a,attrs || {});
		if(link_text){
			var span = document.createElement('span');
			span.innerHTML = link_text;
			a.appendChild(span);
		}
		this.container.appendChild(li);
	}
});