var siteSearch = Class.create();
siteSearch.prototype =
{
	initialize: function()
	{
		this.search_form = $('search_form');
		this.search_input = $('search_text');
		this.search_button = $('search_button');
		this.search_status = $('search_status');

		this.default_value = this.search_input.title;
		this.init_value = this.search_input.value.strip();
		this.button_value = this.search_button.title;
		this.last_search_keyword = '';

		this.wait = '<img src="images/other/wait.gif" alt="Searching..." title="Searching, please wait...">';
		this.msg_empty = 'Enter keyword';
		this.msg_not_found = 'Matches not found';
		this.msg_too_short = 'Keyword is too short';
		this.msg_same_keyword = 'Keyword is same';
		this.min_length = 2;

		this.search_input.value = (this.init_value.length < this.min_length) ? this.default_value : this.search_input.value;

		Element.hide(this.search_status);
		this.search_form.onsubmit = function(){ return false; }

		Event.observe
		(
			this.search_form,
			'submit',
			this.send.bind(this)
		);

		Event.observe
		(
			this.search_input,
			'focus',
			this.setFocus.bind(this,this.search_input)
		);

		Event.observe
		(
			this.search_input,
			'focus',
			this.showMessage.bind(this,'')
		);

		Event.observe
		(
			this.search_input,
			'blur',
			this.setBlur.bind(this,this.search_input)
		);

		return true;
	},

	setFocus: function( input )
	{
		input.value = ( input.value.strip() == input.title ) ? '' : input.value.strip();
		return true;
	},

	setBlur: function( input )
	{
		input.value = ( input.value.strip() == '' ) ? input.title : input.value.strip();
		return true;
	},

	showMessage: function( message )
	{
		if( message == '' || message == undefined  )
		{
			if( this.search_status.innerHTML.length > 0 )
			{
				this.search_status.innerHTML = '';
				Element.hide(this.search_status);
			}
		}
		else
		{
			this.search_status.innerHTML = message;
			Element.show(this.search_status);
		}
		return true;
	},

	send: function()
	{
		this.search_input.value = this.search_input.value.strip();

		if( this.search_input.value == '' || this.search_input.value == this.default_value )
		{
			this.showMessage(this.msg_empty);
			return false;
		}

		if( this.search_input.value.length < this.min_length )
		{
			this.showMessage(this.msg_too_short);
			return false;
		}

		if( this.search_input.value == this.init_value || this.search_input.value == this.last_search_keyword )
		{
			this.showMessage(this.msg_same_keyword);
			return false;
		}

		this.last_search_keyword = this.search_input.value;
		this.showMessage(this.wait);
		this.parameters = this.search_form.serialize();
		this.search_form.disable();

		this.search_request = new Ajax.Request( "pre-search",
					{
						method: "get",
						parameters: this.parameters,
						onComplete: this.reply.bind(this)
					} );
		return false;
	},

	reply: function( request )
	{
		if( request.responseText == 'NOT_FOUND' )
		{
			this.search_form.enable();
			this.showMessage(this.msg_not_found);
			this.search_button.focus();
			return false
		}
		else
		{
			this.showMessage();
			document.location.href = 'search?text='+this.search_input.value;
		}
		return true;
	}

};