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;

		search_object_copy = this;

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

		Event.observe
		(
			this.search_form,
			'submit',
			function(event)
			{
				search_object_copy.send();
				return false;
			}
		);

		Event.observe
		(
			this.search_input,
			'focus',
			function(event)
			{
				search_object_copy.setFocus();
				search_object_copy.showMessage();
			}
		);

		Event.observe
		(
			this.search_input,
			'blur',
			function(event)
			{
				search_object_copy.setBlur();
			}
		);

		return true;
	},

	setFocus: function()
	{
		if( this.search_input.value.strip() == this.default_value )
		{
			this.search_input.value = '';
		}
		return true;
	},

	setBlur: function()
	{
		if( this.search_input.value.strip() == '' )
		{
			this.search_input.value = this.default_value;
		}
		else
		{
			this.search_input.value = this.search_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);
		var parameters = Form.serialize(this.search_form);
		Form.disable(this.search_form);

		var search_request = new Ajax.Request( "pre-search",
					{
						method: "get",
						parameters: parameters,
						onComplete: function( search_request )
						{
							search_object_copy.reply( search_request.responseText )
						}
					} );
		return true;
	},

	reply: function( reply_status )
	{
		if( reply_status == 'NOT_FOUND' )
		{
			Form.enable(this.search_form);
			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;
	}

};