/*******************************************************************************
 * ------------------------------- PageState ----------------------------------*
 ******************************************************************************/

function PageState() {
	// names of search states passed as parameter
	this.init();
}

/**
 * Constructor
 */
PageState.prototype.init = function() {
	this.states = {};
	this.states.dictionary = "uk";
	this.states.lookup = null;
	this.states.advboxopen = false;
	this.states.c = {};
}

PageState.prototype.load = function() {
	var states = $.cookie('PageState');
	if (states)
		this.states = eval("(" + states + ")");

	// first step: retrieve page state informations from the url
	var url = window.location.toString();
	var s = window.location.search;
	var params = (s.length > 1 ? s.substr(1).split("&") : []);
	var searchRegExp = new RegExp("/(search|show|word-list)/(uk|us)/([^\?]*)");
	var dictionary = this.states.dictionary;
	var lookup = this.states.lookup;
	if (url.match(searchRegExp)) {
		var pageType = RegExp.$1;
		dictionary = RegExp.$2;

		if (pageType == "search") {
			// retrieve the search term from the model 
			// to avoid encoding problems
			this.states.lookup = (gSearchTerm ? gSearchTerm : "");
		}
	}

	var paramRegExp = new RegExp("([^=]*)=([^=]*)");

	// We need to concatenate advanced search codes from the url with the selected wordist
	// and then save them in a cookie
	if (dictionary || params.length > 0) {
		this.states.dictionary = dictionary;
		if (lookup && lookup.length > 0)
			this.states.lookup = lookup;
		var seenC = false;
		for (i = 0; i < params.length; i++) {
			params[i].match(paramRegExp);
			key = RegExp.$1;
			val = RegExp.$2;
			// Advanced search codes - several times the same parameter
			// the wordlist can be passed thanks to the parameter 'c' or 'wl' 
			if (key == 'c' || key== 'wl') {
				// if it's the first time we see 'C', reset the values we got
				// from the cookie
				// the drawback is that we lose the content of the advanced
				// search panel
				if (!seenC)
					this.states.c = {};
				seenC = true;
				if (val != -1)
					this.states.c["" + val] = true;
			} else
				this.states[key] = val;
		}
	}

	if (!this.states.pageSize)
		this.states.pageSize = 40;
	this.restoreState();
	var me = this;
}

/**
 * Restore page state
 */
PageState.prototype.restoreState = function() {
	// second step: read cookie informations to restore the state of the page

	// selects the correct dictionary
	var me = this;
	$(".navbtn-container").find("img").each(
			function() {
				var srcRegExp = new RegExp(
						"(.*\/)(nav-lang-)(uk|us)(?:-active)?(-btn\.png)");
				$(this).attr("src").match(srcRegExp);
				var image = RegExp.$1 + RegExp.$2 + RegExp.$3
						+ (me.states.dictionary == RegExp.$3 ? "-active" : "")
						+ RegExp.$4;
				var src = $(this).attr("src", image);
			}).click(
				function() {
					var hiddenActionId = $(this).attr("id").replace(/[^-]*$/, "searchurl");
					var action = $("#" + hiddenActionId).attr("value");
					$(".searchform").attr("action", action);
					$(".searchform").submit();
				}
			);

	// fills the search term in the input box
	var lookup = (this.states.lookup ? this.states.lookup : "");
	$("[name='q']").val(lookup);
	this.restoreFilterWordlistStates();
	// use the callback to restore advanced search box states
	if (this.states.advboxopen)
		$(".advsearch-title").triggerHandler("click");

	if (this.states.pageSize) {
		$("#pageSize").val(this.states.pageSize); // small form on top of the
													// page
		$("#pageSizeHidden").val(this.states.pageSize); // the big search form
														// on the left
	}
}

/**
 * Restore the radio buttons for the simple search and the advanced search
 * combos
 */
PageState.prototype.restoreFilterWordlistStates = function() {
	// selects the correct radio button (A1, etc...)
	// and correct items in the the advanced search combos
	var advCodes = this.states.c;
	if (advCodes != {}) {
		for ( var code in advCodes) {
            $("*[name='wl'][value='" + code + "']").attr("checked", "checked");
            if (code != -1) // do this because all selects will have a -1
                $("*[name='c'] option[value='" + code + "']").parent().val(
                        code);
		}
	}
}

/**
 * Preserve the states of all forms controls and saves to the cookie
 */
PageState.prototype.saveFormState = function() {
	this.states.lookup = $("#searchform-textbox").val();
	this.states.advboxopen = !$("#advsearch-filterlist").hasClass("folded");
	this.states.c = {};
	this.saveWordListState();
	this.saveFiltersState();
	this.save();
}

/**
 * Preserve the states of the advanced search combos
 */
PageState.prototype.saveFiltersState = function() {
	var me = this;
	var $advFilterBox = $("#advsearch-filterlist");
	$advFilterBox.find("*[name='c']").each( function() {
		me.states.c[$(this).val() + ""] = true;
	});
}

/**
 * Save the current word list code when the user clicks in the search box - we
 * need to remember it for the browse list
 */
PageState.prototype.saveWordListState = function() {
	var me = this;
	$("*[name='wl']").each( function() {
		if ($(this).attr("checked"))
			me.states.c[$(this).val() + ""] = true;
		else
			delete me.states.c[$(this).val()]
	});
}

/**
 * Save page state
 */
PageState.prototype.save = function() {
	// third step: save the cookie
	var states = JSON.serialize(this.states);
	$.cookie('PageState', states, {
		path :'/'
	});
}