// ////////////////////////////////////////////////////////////////////////////

// Symbian Foundation Example Code

//

// This software is in the public domain. No copyright is claimed, and you 

// may use it for any purpose without license from the Symbian Foundation.

// No warranty for any purpose is expressed or implied by the authors or

// the Symbian Foundation. 

// ////////////////////////////////////////////////////////////////////////////

var resultsPerPage = 30;

var wikiSearchBaseUrl = symbianOrgBaseUrl + "/wiki/api.php?format=xml&action=query&list=search&srsearch=";

var wikiSearchOffsetQueryPart = "&sroffset=";

var wikiSearchLimitQueryPart = "&srlimit=";

var wikiSearchWhatQueryPart = "&srwhat=";

var wikiViewPageUrlBase = symbianOrgBaseUrl + "/wiki/index.php?title=";

var wikiPrintableParam = "&printable=yes";

//var wikiListCategoriesUrl = symbianOrgBaseUrl + "/wiki/api.php?format=xml&action=query&list=allcategories&aclimit=500&acprop=size";

//var wikiWatchListUrl = "http://en.wikipedia.org/w/api.php?action=query&list=watchlist&wlallrev&wlprop=ids|title|timestamp|user|comment";

//var wikiWatchListFeed = "/wiki/api.php?action=feedwatchlist&feedformat=rss";

var wikiSearchOptions = [

    { value: "title", text: "Search in title only" },

    { value: "text", text: "Full text search" },

];

function WikiHome (parent) {

	ListView.prototype.init.call(this, null, createCaption("Symbian Wiki"));	

	this.previousView = parent;

	this.wikiMainPageButton = new NavigationButton(1, "right.gif", "Browse: Main page");

	this.wikiSearchButton = new FormButton(null, "Search");

	this.wikiSearchSelection = new SelectionList(null, null, wikiSearchOptions, false, wikiSearchOptions[0]);

	this.wikiSearchString = new TextField('wikiSearchString', null, "");

	var self = this;

	this.wikiMainPageButton.addEventListener("ActionPerformed", function(){wikiBrowse("Main Page");});

	this.wikiSearchButton.addEventListener("ActionPerformed", function(){self.search(0);});

	this.addControl(this.wikiMainPageButton);

	this.addControl(new Label(null, "Search Wiki", null));

	this.addControl(this.wikiSearchString);

	this.addControl(this.wikiSearchSelection);

	this.addControl(this.wikiSearchButton);

//	wikiBrowseButton = new NavigationButton(1, "right.gif", "Browse categories");

//	wikiBrowseButton.addEventListener("ActionPerformed", function(){browseWikiCategories.show();});

//	this.addControl(wikiBrowseButton);

}

WikiHome.prototype = new ListView(null, null);

WikiHome.prototype.wikiMainPageButton = null;

WikiHome.prototype.wikiSearchButton = null;

WikiHome.prototype.wikiSearchString = null;

WikiHome.prototype.wikiSearchSelection = null;

var lastWikiSearchWasFrom = 0;

var lastWikiSearchResultCountWas = 0;

WikiHome.prototype.search = function(from) {

	lastWikiSearchWasFrom = from;

	var srstring = this.wikiSearchString.getText();

    var selectedTitleOrText = this.wikiSearchSelection.getSelected();

    var titleOrText = (selectedTitleOrText != null) ? selectedTitleOrText.value : "title";

	var url = this.formSearchUrl( srstring , from, resultsPerPage, titleOrText );

	var reader = new RssReader("Wiki: " + srstring, url, new WikiFeedPresenter(null), this, wikiResponseParser);

	reader.show();

}

WikiHome.prototype.formSearchUrl = function(query, offset, limit, what) {

	var buf = wikiSearchBaseUrl + query

	if (offset > 0) {

		buf += wikiSearchOffsetQueryPart + offset;

	}

	buf += wikiSearchLimitQueryPart + limit

	buf += wikiSearchWhatQueryPart + what;

	return buf;

}

// /////////////////////////////////////////////////////////////////////////////

// RssReader customisations

// response parser for forum groups

function wikiResponseParser(broker, responseStatus, xmlDoc) {

    if (responseStatus == 200 && xmlDoc != null) {

		// for compatibility with rss

		var lastModified = new Date();

        // init result items array

        var items = [];

		var elements = xmlDoc.getElementsByTagName("p");

		for (var i = 0; i < elements.length; i++) {

			var pagetitle = elements[i].getAttribute("title");

            items.push({ id: ""+i, title: pagetitle});

		}

		lastWikiSearchResultCountWas = elements.length;

        // update was completed successfully

        return { status: "ok", lastModified: lastModified, items: items };

    } else {

        // update failed

        return { status: "error" };

    }

}

// FeedPresenter implementation for wiki

function WikiFeedPresenter(rssreader){

	if (rssreader) {

		this.init(rssreader);

	}

}

// WikiFeedPresenter is a subclass of ButtonFeedPresenter

WikiFeedPresenter.prototype = new ButtonFeedPresenter(null);

// WikiFeedPresenter "Constructor"

WikiFeedPresenter.prototype.init = function(rssreader) {

	ButtonFeedPresenter.prototype.init.call(this, rssreader);

}

// Handle the click on a specific item

WikiFeedPresenter.prototype.feedClicked = function(event){

	var buttonid = event.source.id;

	if (buttonid == "Next page") {

		wiki.search(lastWikiSearchWasFrom + resultsPerPage);

	}

	else if (buttonid == "Previous page") {

		var from = lastWikiSearchWasFrom - resultsPerPage; 

		if ( from < 0 ) from = 0;

		wiki.search(from);

	}

	else {

		// show article

		var title = this.items[buttonid].title;

		wikiBrowse(title);

	}

}

// Create and add controls to be shown before items list.

WikiFeedPresenter.prototype.addFooterItems = function(){

    var self = this;

	if (lastWikiSearchResultCountWas == resultsPerPage) {

		var nextPageButton = new NavigationButton("Next page", "blueright.gif", "Next page");

		nextPageButton.addEventListener("ActionPerformed", function(event){ self.feedClicked(event); });

		this.rssreader.addControl(nextPageButton);

	}

	if (lastWikiSearchWasFrom > 0) {

		var prevPageButton = new NavigationButton("Previous page", "blueright.gif", "Previous page");

		prevPageButton.addEventListener("ActionPerformed", function(event) { self.feedClicked(event); });

		this.rssreader.addControl(prevPageButton);

	}

}

// /////////////////////////////////////////////////////////////////////////////////

// Browse / view wiki pages in 'printable format'

var wikiAjax;

var pageBeingShown;

function wikiBrowse(page) {

	pageBeingShown = page;

	uiManager.showNotification(-1, "wait", "Loading page...", -1);

	if ( page ) {

		wikiAjax = new Ajax();

		wikiAjax.onreadystatechange = function() { wikiPageDownloadStateChanged(); };

		var url = wikiViewPageUrlBase  + encodeURIComponent(page) + wikiPrintableParam; 

	    // initiate the request

	    wikiAjax.open("GET", url, true);

	    wikiAjax.send(null);

	}

}

function wikiPageDownloadStateChanged() {

    if (wikiAjax.readyState == 4) {

		uiManager.hideNotification();

		var html = wikiAjax.responseText;

		var start = html.indexOf('<div id="bodyContent">');

		var end = findDivEnd(html, start);

		var pageView = new ListView(null, createCaption(pageBeingShown));

		var container = new TextPane(null, null, modWikiLinks(html.substring(start, end)));

		pageView.addControl(container);

		pageView.previousView = uiManager.currentView;

		pageView.show();

		if (window.widget) {

			widget.setNavigationEnabled(true);

		}

	}

}

function modWikiLinks(text) {

	var tmp = text.replace(/ src="/g, ' src="http://developer.symbian.org');

	// images sorted. now links

	var strToLookFor = ' href="/wiki/index.php/';

	var from = 0;

	var ind = tmp.indexOf(strToLookFor);

	var buf ="";

	while ( ind > 0 ) {

		buf = buf + tmp.substring(from, ind);

		// extract page name

		var ind2 = tmp.indexOf('"', ind + strToLookFor.length);

		var pageName = tmp.substring(ind + strToLookFor.length, ind2);

		buf += " style=\"text-decoration: underline;\" href=\"JavaScript:void(0)\" onclick=\"wikiBrowse('" + pageName + "'); return false;\"";

		from = ind2;

		ind = tmp.indexOf(strToLookFor, from);

	}

	buf = buf + tmp.substring(from);

	return buf; 

}

function findDivEnd(text, from) {

	var openDivCount = 1;

	var divind = text.indexOf("<div", from+1);

	var cdivind = text.indexOf("</div", from+1);

	var pos = from;

	while ( openDivCount > 0 && divind > 0 && cdivind > 0 ) {

		pos = Math.min(divind, cdivind);

		if ( pos == divind ) {

			openDivCount ++;

		}

		if ( pos == cdivind ) {

			openDivCount --;

		}

		divind = text.indexOf("<div", pos+1);

		cdivind = text.indexOf("</div", pos+1);

	}

	return pos;

}