/*
Script: Request.HTML.js
	Extends the basic Request Class with additional methods for interacting with HTML responses.

License:
	MIT-style license.
*/

Request.HTML = new Class({

	Extends: Request,

	options: {
		update: false,
		append: false,
		evalScripts: true,
		filter: false
	},

	processHTML: function(text){
		var match = text.match(/<body[^>]*>([\s\S]*?)<\/body>/i);
		text = (match) ? match[1] : text;

		var container = new Element('div');

		return $try(function(){
			var root = '<root>' + text + '</root>', doc;
			if (Browser.Engine.trident){
				doc = new ActiveXObject('Microsoft.XMLDOM');
				doc.async = false;
				doc.loadXML(root);
			} else {
				doc = new DOMParser().parseFromString(root, 'text/xml');
			}
			root = doc.getElementsByTagName('root')[0];
			if (!root) return;
			for (var i = 0, k = root.childNodes.length; i < k; i++){
				var child = Element.clone(root.childNodes[i], true, true);
				if (child) container.grab(child);
			}
			return container;
		}) || container.set('html', text);
	},

	success: function(text){
		var options = this.options, response = this.response;

		response.html = text.stripScripts(function(script){
			response.javascript = script;
		});

		var temp = this.processHTML(response.html);

		response.tree = temp.childNodes;
		response.elements = temp.getElements('*');

		if (options.filter) response.tree = response.elements.filter(options.filter);
		if (options.update) $(options.update).empty().set('html', response.html);
		else if (options.append) $(options.append).adopt(temp.getChildren());
		if (options.evalScripts) $exec(response.javascript);

		this.onSuccess(response.tree, response.elements, response.html, response.javascript);
	}

});

Element.Properties.send = {

	set: function(options){
		var send = this.retrieve('send');
		if (send) send.cancel();
		return this.eliminate('send').store('send:options', $extend({
			data: this, link: 'cancel', method: this.get('method') || 'post', url: this.get('action')
		}, options));
	},

	get: function(options){
		if (options || !this.retrieve('send')){
			if (options || !this.retrieve('send:options')) this.set('send', options);
			this.store('send', new Request(this.retrieve('send:options')));
		}
		return this.retrieve('send');
	}

};

Element.Properties.load = {

	set: function(options){
		var load = this.retrieve('load');
		if (load) load.cancel();
		return this.eliminate('load').store('load:options', $extend({data: this, link: 'cancel', update: this, method: 'get'}, options));
	},

	get: function(options){
		if (options || ! this.retrieve('load')){
			if (options || !this.retrieve('load:options')) this.set('load', options);
			this.store('load', new Request.HTML(this.retrieve('load:options')));
		}
		return this.retrieve('load');
	}

};

Element.implement({

	send: function(url){
		var sender = this.get('send');
		sender.send({data: this, url: url || sender.options.url});
		return this;
	},

	load: function(){
		this.get('load').send(Array.link(arguments, {data: Object.type, url: String.type}));
		return this;
	}

});