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

// 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 MILLIS_IN_A_DAY = 24*60*60*1000;

var KEEP_HISTORY_FOR = 90 * MILLIS_IN_A_DAY; // 90 days

var KEEP_CONTENT = false;

function HistoryViewItem(articleTitle, articleContent, articleBase, pos) {

	var d = new Date();

	this.articleTitle = articleTitle;

	this.articleContent = articleContent; 

	this.articleBase = articleBase;

	this.pos = pos;

	this.timestamp = d.getTime();

}

function HistoryView (){

	try {

		ListView.prototype.init.call(this, null, null);	

		var caption = new NavigationButton(1, "titlebar.png", "History", true);

		caption.addEventListener("ActionPerformed", function(){wikiHomeView.show();});

		this.addControl(caption);

		this.previousView = null;

		this.items = new Array();

		this.startindex = 0;

		this.endindex = 0;

		this.current = 0;

		this.lastRender = 0;	

		this.todayControl = null;

		this.loadItems();

	}catch(w) {alert(w);}

}

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

HistoryView.prototype.items = null;

HistoryView.prototype.addItem = function(articleTitle, articleContent, articleBase){

	// do not store it if its the same as previous one

	if ( this.items[this.current] != undefined && this.items[this.current] != null && articleTitle == this.items[this.current].articleTitle){

		return;

	}

	var item = null;

	this.current = this.endindex;

	if ( KEEP_CONTENT ){

		item = new HistoryViewItem(articleTitle, articleContent, articleBase, this.current);

	} else {

		item = new HistoryViewItem(articleTitle, null, articleBase, this.current);	

	}

	this.items[this.current-this.startindex]= item;

	this.endindex++;

	this.saveItem(item);

}

HistoryView.prototype.saveItem = function(item){

	if ( window.widget ) {

//		alert("Saving item: pos=" + item.pos +", title=" + item.articleTitle +", ts=" + item.timestamp

//		+ "titlekey:" + getHistoryTitleKey(item.pos) + ", timekey: " + getHistoryTimeKey(item.pos)	);

		widget.setPreferenceForKey(item.articleTitle, getHistoryTitleKey(item.pos));

		if (KEEP_CONTENT) {

			widget.setPreferenceForKey(item.articleContent, getHistoryContentKey(item.pos));

		}

		widget.setPreferenceForKey(item.articleBase, getHistoryBaseKey(item.pos));

		widget.setPreferenceForKey(""+item.timestamp, getHistoryTimeKey(item.pos));

		this.storeIndex();

	}

}

HistoryView.prototype.storeIndex = function () {

	widget.setPreferenceForKey("" + this.startindex, "history.start");

	widget.setPreferenceForKey("" + this.endindex, "history.end");

	widget.setPreferenceForKey("" + this.current, "history.current");

//	alert("index stored, start:"+this.startindex + ", end:"+this.endindex + ", current:"+this.current);

}

HistoryView.prototype.clear = function(){

	this.items = new Array();

	if (window.widget) {

		for (var i = this.startindex; i < this.endindex + 1; i++) {

			widget.setPreferenceForKey(null, getHistoryTitleKey(i));

			if (KEEP_CONTENT) {

				widget.setPreferenceForKey(null, getHistoryContentKey(i));

			}

			widget.setPreferenceForKey(null, getHistoryTimeKey(i));

		}

		this.startindex = 0;

		this.endindex = 0;

		this.current = 0;

		this.storeIndex();

		this.lastRender = 0;

		this.render();

	}

}

HistoryView.prototype.loadItems = function(){

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

	var self = this;

	setTimeout(function(){self.doLoadItems();},0);

}

HistoryView.prototype.doLoadItems = function(){

	if ( window.widget ) {

		var d = new Date();

		var now = d.getTime();

		this.items = new Array();

		var tmpstart 	= 	widget.preferenceForKey("history.start");

		var tmpend 		= 	widget.preferenceForKey("history.end");

		var tmpcurr		=	widget.preferenceForKey("history.current");

		this.startindex = (( tmpstart != undefined && tmpstart != null ) ? parseInt(tmpstart) : 0);

		this.endindex = (( tmpend != undefined && tmpend != null ) ? parseInt(tmpend) : 0);

		this.current = (( tmpcurr != undefined && tmpcurr != null ) ? parseInt(tmpcurr) : 0);

//		alert("startindex=" + this.startindex +", endindex=" + this.endindex+ ", current=" + this.current);

		for (var i = this.startindex; i < this.endindex; i++) {

			var pos =  i - this.startindex;

			var title = widget.preferenceForKey(getHistoryTitleKey(i));

//			alert("Examining item: i=" + i + ", pos=" + pos +", title=" + title );

			if ( !title || title == null || title == "null") continue;

			var item = new HistoryViewItem(title,null,null,i);

			if (KEEP_CONTENT) {

				item.articleContent = widget.preferenceForKey(getHistoryContentKey(i));

			}

			item.articleBase = widget.preferenceForKey(getHistoryBaseKey(i));

			item.timestamp = parseFloat(widget.preferenceForKey(getHistoryTimeKey(i)));

			// delete items older than KEEP_HISTORY_FOR

			if (item.timestamp < (now - KEEP_HISTORY_FOR)) {

//				alert("Deleting old item: ts="+ item.timestamp + ", th=" + (now - KEEP_HISTORY_FOR));

				widget.setPreferenceForKey(null, getHistoryTitleKey(i));

				if (KEEP_CONTENT) {

					widget.setPreferenceForKey(null, getHistoryContentKey(i));

				}

				widget.setPreferenceForKey(null, getHistoryBaseKey(i));

				widget.setPreferenceForKey(null, getHistoryTimeKey(i));

			}

			else {

				item.pos = i;

				this.items[pos] = item;

			}

//			alert("Loaded item: i=" + i + ", pos=" + pos +", title=" + title +", ts=" + item.timestamp);

		}

	}

	uiManager.hideNotification();

}

HistoryView.prototype.render = function(){

	var d = new Date();

	var now = d.getTime();

	// what needs to be rendered?

	if (now - this.lastRender > MILLIS_IN_A_DAY || this.todayControl == null) { // render all

		// clear components

		this.removeAllControls();

		var caption = new NavigationButton(1, "titlebar.png", "History", true);

		caption.addEventListener("ActionPerformed", function(){

			wikiHomeView.show();

		});

		this.addControl(caption);

		// add components for history items, up to today

		this.todayControl = new ContentPanel(null, "Last 24 hours", "", true, true);

		this.todayControl.setContent(this.renderHistoryContent(now-MILLIS_IN_A_DAY, now));

		this.addControl(this.todayControl);

		var weekControl = new ContentPanel(null, "Last 7 days", "", true, false);

		weekControl.setContent(this.renderHistoryContent(now-7*MILLIS_IN_A_DAY,now-MILLIS_IN_A_DAY));

		this.addControl(weekControl);

		var moreControl = new ContentPanel(null, "More than 7 days", "", true, false);

		moreControl.setContent(this.renderHistoryContent(0,now-7*MILLIS_IN_A_DAY));

		this.addControl(moreControl);

	} else {

		// render only today

		this.todayControl.setContent(this.renderHistoryContent(now-MILLIS_IN_A_DAY, now));

	} 

	this.lastRender = now;		

}

HistoryView.prototype.renderHistoryContent = function (from , to) {

	var buf = "<table class='historytable'>";

	for ( var i = this.endindex ; i >= this.startindex ; i -- ) {

		var ind = i - this.startindex;

		if ( this.items[ind] == undefined || this.items[ind] == null ) continue;

		if ( this.items[ind].timestamp < from ) break;

		if ( this.items[ind].timestamp < to ) {

			buf += this.renderHistoryItem(this.items[ind]);			

		}

	}

	buf += "</table>"

	return buf;

}

HistoryView.prototype.renderHistoryItem = function(item){

	if ( item == undefined || item == null ) return "";

    var buf = "<tr><td><small>";

	buf += shortFormatTime(item.timestamp);

	buf += "</small></td><td  width=70%>";	 

	buf += "<div class=\"FeedItemLink\">";

	buf += "<a href=\"JavaScript:void(0)\" onclick=\"event.stopPropagation();wikiHistoryView.goTo(" ;

	buf += item.pos;

	buf +=  "); return false;\">";

	buf += "<strong>";

	buf += shorten(item.articleTitle, 30);

	buf += "</strong></a>";

	buf += "</div>";

	buf += "</td><td><div class=\"FeedItemLink\">";

	buf += "<a href=\"JavaScript:void(0)\" onclick=\"event.stopPropagation();wikiHistoryView.deleteItem(" ;

	buf += item.pos;

	buf +=  "); return false;\">";

	buf += "<img src=delete.png border=0></a>";

	buf += "</div>";

	buf += "</td></tr>";

	return buf;

}

HistoryView.prototype.deleteItem = function(pos){	

	this.items[pos-this.startindex] = null;

	if ( window.widget ) {

		widget.setPreferenceForKey(null, getHistoryTitleKey(pos));

		if (KEEP_CONTENT) {

			widget.setPreferenceForKey(null, getHistoryContentKey(pos));

		}

		widget.setPreferenceForKey(null, getHistoryBaseKey(pos));

		widget.setPreferenceForKey(null, getHistoryTimeKey(pos));

		this.storeIndex();

	}

	this.lastRender = 0;

	this.render();

}

HistoryView.prototype.show = function(){

	try {

		this.render();

	}catch(e){ alert(e);}

	View.prototype.show.call(this);

}

HistoryView.prototype.goTo = function(pos){

	this.current = pos;

	wikiBrowse(this.items[pos-this.startindex].articleTitle, true, this.items[pos-this.startindex].articleBase); // true means don't re-add to history	 	

}

HistoryView.prototype.go = function(offset){

	var newcurrent = this.current + offset;

	var idx = newcurrent-this.startindex;

	if ( newcurrent >= this.startindex && newcurrent <= this.endindex

		 && idx >= 0 && this.items[idx] != undefined && this.items[idx] != null	) {

		this.current = newcurrent;

		wikiBrowse(this.items[idx].articleTitle, true, this.items[idx].articleBase);	 	

	}

}

HistoryView.prototype.hasNext = function(){

	var newidx = this.current + 1; 

	return ( newidx < this.endindex && this.items[newidx] != undefined && this.items[newidx] != null );  

}

// abstract function for updating per-view menu

// only called if window.widget is defined

HistoryView.prototype.setupMenu = function(){

	if ( window.widget ) {

		menu.clear();

		var clearMenuItem = new MenuItem("Clear", MENU_ITEM_HISTORY_CLEAR);

		var self = this; 

		clearMenuItem.onSelect = function(){self.clear();};

		menu.append(clearMenuItem);

		var self = this;

		var searchMenuItem = new MenuItem("Search", MENU_ITEM_MAIN_SEARCH); 

		searchMenuItem.onSelect = function(){wikiHomeView.show();};

		menu.append(searchMenuItem);

		var historyMenuItem = new MenuItem("History", MENU_ITEM_MAIN_HISTORY); 

		historyMenuItem.onSelect = function(){wikiHistoryView.previousView = self; wikiHistoryView.show();};

		menu.append(historyMenuItem);

		var bookmarksMenuItem = new MenuItem("Bookmarks", MENU_ITEM_MAIN_BOOKMARKS); 

		bookmarksMenuItem.onSelect = function(){wikiBookmarksView.show();};

		menu.append(bookmarksMenuItem);

		addHelpMenuItems();

	}

}

function getHistoryKeyBase(pos) {

	return "hist." + pos + "."; 

}

function getHistoryTitleKey(pos) {

	return getHistoryKeyBase(pos) + "title"; 

}

function getHistoryContentKey(pos) {

	return getHistoryKeyBase(pos) + "content"; 

}

function getHistoryBaseKey(pos) {

	return getHistoryKeyBase(pos) + "base"; 

}

function getHistoryTimeKey(pos) {

	return getHistoryKeyBase(pos) + "time"; 

}

//HistoryView.prototype.removeItem = function(articleTitle){

//	// find index

//	var ind = this.findItemIdFromTitle(articleTitle)

//	if ( ind == -1 ) {

//		return;

//	}

//

//	// remove item

//	this.items[ind-this.startindex] = null;

//	if (window.widget) {

//		widget.setPreferenceForKey(null, getHistoryTitleKey(ind));

//		if (KEEP_CONTENT) {

//			widget.setPreferenceForKey(null, getHistoryContentKey(ind));

//		}

//		widget.setPreferenceForKey(null, getHistoryTimeKey(ind));

//	}

//	this.current = ind;

//	this.endindex = ind;

//	this.render();

//}

//HistoryView.prototype.findItemIdFromTitle = function(title) {

//	var ind = -1;

//	for ( var i = this.startindex ; i < this.endindex + 1 ; i ++ ) {

//		var arrind = i-this.startindex;

//		if ( this.items[arrind] && this.items[arrind] != null && title == this.items[arrind].articleTitle) {

//			ind = i;

//			break;

//		}

//	}

//	return ind;

//}

// return already downloaded content for an article or null

// if we don't have it

//HistoryView.prototype.getContentForArticle = function(articleTitle){

//	if (window.widget && KEEP_CONTENT) {

//		var i = this.findItemIdFromTitle(articleTitle);

//		return widget.preferenceForKey(getHistoryContentKey(i));

//	}

//	return null;

//}