offline: store labels

[tt-rss.git] / offline.js

var SCHEMA_VERSION = 6;

var offline_mode = false;
var store = false;
var localServer = false;
var db = false;

function view_offline(id, feed_id) {
	try {

		enableHotkeys();
		showArticleInHeadlines(id);

		db.execute("UPDATE articles SET unread = 0 WHERE id = ?", [id]);

		var rs = db.execute("SELECT * FROM articles WHERE id = ?", [id]);

		if (rs.isValidRow()) {

			var tmp = "<div class=\"postReply\">";

			tmp += "<div class=\"postHeader\" onmouseover=\"enable_resize(true)\" "+
				"onmouseout=\"enable_resize(false)\">";

			tmp += "<div class=\"postDate\">"+rs.fieldByName("updated")+"</div>";

			if (rs.fieldByName("link") != "") {
				tmp += "<div clear='both'><a target=\"_blank\" "+
					"href=\"" + rs.fieldByName("link") + "\">" +
					rs.fieldByName("title") + "</a></div>";
			} else {
				tmp += "<div clear='both'>" + rs.fieldByName("title") + "</div>";
			}

/*			tmp += "<div style='float : right'> "+
				"<img src='images/tag.png' class='tagsPic' alt='Tags' title='Tags'>";
			tmp += rs.fieldByName("tags");
			tmp += "</div>"; */

/*			tmp += "<div clear='both'>"+
				"<a target=\"_blank\" "+
					"href=\"" + rs.fieldByName("comments") + "\">" +
					__("comments") + "</a></div>"; */

			tmp += "</div>";

			tmp += "<div class=\"postContent\">"
			tmp += rs.fieldByName("content");
			tmp += "</div>";

			tmp += "</div>";

			render_article(tmp);
			update_local_feedlist_counters();
		}

		rs.close();

		return false;

	} catch (e) {
		exception_error("view_offline", e);
	}
}

function viewfeed_offline(feed_id, subop, is_cat, subop_param, skip_history, offset) {
	try {
		notify('');

		if (!offset) offset = 0;

		if (offset > 0) {
			_feed_cur_page = parseInt(offset);
			if (_infscroll_request_sent) {
				return;
			}
		} else {
			_feed_cur_page = 0;
			_infscroll_disable = 0;
		}

		if (getActiveFeedId() != feed_id) {
			_feed_cur_page = 0;
			active_post_id = 0;
			_infscroll_disable = 0;
		}

		loading_set_progress(100);

		clean_feed_selections();
	
		setActiveFeedId(feed_id, is_cat);

		if (!is_cat) {
			var feedr = document.getElementById("FEEDR-" + feed_id);
			if (feedr && !feedr.className.match("Selected")) {	
				feedr.className = feedr.className + "Selected";
			} 
		} else {
			var feedr = document.getElementById("FCAT-" + feed_id);
			if (feedr && !feedr.className.match("Selected")) {	
				feedr.className = feedr.className + "Selected";
			} 
		}

		disableContainerChildren("headlinesToolbar", false);
		Form.enable("main_toolbar_form");

		var f = document.getElementById("headlines-frame");
		try {
			if (reply.offset == 0) { 
				debug("resetting headlines scrollTop");
				f.scrollTop = 0; 
			}
		} catch (e) { };


		var tmp = "";

		rs = db.execute("SELECT title FROM feeds WHERE id = ?", [feed_id]);

		if (rs.isValidRow() || feed_id == -1 || feed_id == -4) {

			feed_title = rs.field(0);

			if (feed_id == -1) {
				feed_title = __("Starred articles");
			}

			if (feed_id == -4) {
				feed_title = __("All articles");
			}

			if (offset == 0) {
				tmp += "<div id=\"headlinesContainer\">";
		
				tmp += "<div class=\"headlinesSubToolbar\">";
				tmp += "<div id=\"subtoolbar_ftitle\">";
				tmp += feed_title;
				tmp += "</div>";

				var sel_all_link;
				var sel_unread_link;
				var sel_none_link;
				var sel_inv_link;

				if (document.getElementById("content-frame")) {
					sel_all_link = "javascript:selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', true, '', true)";
					sel_unread_link = "javascript:selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', true, 'Unread', true)";
					sel_none_link = "javascript:selectTableRowsByIdPrefix('headlinesList', 'RROW-', 'RCHK-', false)";
					sel_inv_link = "javascript:invertHeadlineSelection()";
				} else {
					sel_all_link = "javascript:cdmSelectArticles('all')";
					sel_unread_link = "javascript:cdmSelectArticles('unread')";
					sel_none_link = "javascript:cdmSelectArticles('none')";
					sel_inv_link = "javascript:invertHeadlineSelection()";
				}

				tmp += __('Select:')+
					" <a href=\""+sel_all_link+"\">"+__('All')+"</a>, "+
					"<a href=\""+sel_unread_link+"\">"+__('Unread')+"</a>, "+
					"<a href=\""+sel_inv_link+"\">"+__('Invert')+"</a>, "+
					"<a href=\""+sel_none_link+"\">"+__('None')+"</a>";
	
				tmp += "&nbsp;&nbsp;";
	
				tmp += "</div>";
	
				tmp += "<div id=\"headlinesInnerContainer\" onscroll=\"headlines_scroll_handler()\">";
				if (document.getElementById("content-frame")) {
					tmp += "<table class=\"headlinesList\" id=\"headlinesList\" cellspacing=\"0\">";
				}
			
			}
	
			var limit = 30;
		
			var toolbar_form = document.forms["main_toolbar_form"];
			
			var limit = toolbar_form.limit[toolbar_form.limit.selectedIndex].value;
			var view_mode = toolbar_form.view_mode[toolbar_form.view_mode.selectedIndex].value;

			var limit_qpart = "";
			var strategy_qpart = "";
			var mode_qpart = "";
			var offset_qpart = "";

			if (limit != 0) {
				limit_qpart = "LIMIT " + limit;
			}

			if (view_mode == "all_articles") {
				mode_qpart = "1";
			} else if (view_mode == "adaptive") {
				if (get_local_feed_unread(feed_id) > 0) {
					mode_qpart = "unread = 1";
				} else {
					mode_qpart = "1";
				}
			} else if (view_mode == "marked") {
				mode_qpart = "marked = 1";
			} else if (view_mode == "unread") {
				mode_qpart = "unread = 1";
			} else {
				mode_qpart = "1";
			}

			if (feed_id > 0) {
				strategy_qpart = "feed_id = " + feed_id;
			} else if (feed_id == -1) {
				strategy_qpart = "marked = 1";
			} else if (feed_id == -4) {
				strategy_qpart = "1";
			}

			if (offset > 0) {
				offset_qpart = "OFFSET " + (offset*30);
			} else {
				offset_qpart = "";
			}

			var query = "SELECT *,feeds.title AS feed_title "+
				"FROM articles,feeds WHERE " +
				"feed_id = feeds.id AND " +
				strategy_qpart +
				" AND " + mode_qpart + 
				" ORDER BY updated DESC "+
				limit_qpart + " " +
				offset_qpart;

			var rs = db.execute(query);

			var line_num = offset*30;

			var real_feed_id = feed_id;

			while (rs.isValidRow()) {

				var id = rs.fieldByName("id");
				var feed_id = rs.fieldByName("feed_id");

				var entry_feed_title = false;

				if (real_feed_id < 0) {
					entry_feed_title = rs.fieldByName("feed_title");
				}

				var marked_pic;
	
				var row_class = (line_num % 2) ? "even" : "odd";

				if (rs.fieldByName("unread") == "1") {
					row_class += "Unread";
				}
	
				if (rs.fieldByName("marked") == "1") {
					marked_pic = "<img id=\"FMPIC-"+id+"\" "+
						"src=\"images/mark_set.png\" class=\"markedPic\""+
						"alt=\"Unstar article\" onclick='javascript:tMark("+id+")'>";
				} else {
					marked_pic = "<img id=\"FMPIC-"+id+"\" "+
						"src=\"images/mark_unset.png\" class=\"markedPic\""+
						"alt=\"Star article\" onclick='javascript:tMark("+id+")'>";
				}

				var mouseover_attrs = "onmouseover='postMouseIn($id)' "+
					"onmouseout='postMouseOut($id)'";

				var content_preview = truncate_string(strip_tags(rs.fieldByName("content")), 
						100);
	
				if (document.getElementById("content-frame")) {

					tmp += "<tr class='"+row_class+"' id='RROW-"+id+"' "+mouseover_attrs+">";
					
					tmp += "<td class='hlUpdPic'> </td>";
	
					tmp += "<td class='hlSelectRow'>"+
						"<input type=\"checkbox\" onclick=\"tSR(this)\"	id=\"RCHK-"+id+"\"></td>";
					
					tmp += "<td class='hlMarkedPic'>"+marked_pic+"</td>";
		
					tmp += "<td onclick='view("+id+","+feed_id+")' "+
						"class='hlContent' valign='middle'>";
		
					tmp += "<a target=\"_blank\" id=\"RTITLE-"+id+"\" href=\"" + 
						rs.fieldByName("link") + "\"" +
						"onclick=\"return view("+id+","+feed_id+");\">"+
						rs.fieldByName("title");
	
					tmp += "<span class=\"contentPreview\"> - "+content_preview+"</span>";
	
					tmp += "</a>";

					if (entry_feed_title) {
						tmp += " <span class=\"hlFeed\">"+
							"(<a href='javascript:viewfeed("+feed_id+
							")'>"+entry_feed_title+"</a>)</span>";
					}

					tmp += "</td>";

					tmp += "<td class=\"hlUpdated\" onclick='view("+id+","+feed_id+")'>"+
						"<nobr>"+rs.fieldByName("updated").substring(0,16)+
						"</nobr></td>";
	
					tmp += "</tr>";
				} else {

					var add_class = "";

					if (rs.fieldByName("unread") == "1") {
						add_class = "Unread";					
					}
				
					tmp += "<div class=\"cdmArticle"+add_class+"\" id=\"RROW-"+id+"\" "+
						mouseover_attrs+"'>";

					feed_icon_img = "<img class=\"tinyFeedIcon\" src=\""+
						getInitParam("icons_url")+"/"+feed_id+".ico\" alt=\"\">";
					cdm_feed_icon = "<span style=\"cursor : pointer\" "+
						"onclick=\"viewfeed("+feed_id+")\">"+feed_icon_img+"</span>";

					tmp += "<div class=\"cdmHeader\">";
					tmp += "<div class=\"articleUpdated\">"+
						rs.fieldByName("updated").substring(0,16)+
						" "+cdm_feed_icon+"</div>";

					tmp += "<span id=\"RTITLE-"+id+"\" class=\"titleWrap\">"+
						"<a class=\"title\" onclick=\"javascript:toggleUnread("+id+", 0)\""+
						"target=\"_blank\" href=\""+rs.fieldByName("link")+
						"\">"+rs.fieldByName("title")+"</a>";

					if (entry_feed_title) {
						tmp += "&nbsp;(<a href='javascript:viewfeed("+feed_id+
							")'>"+entry_feed_title+"</a>)";
					}

					tmp += "</span></div>";

					tmp += "<div class=\"cdmContent\" onclick=\"cdmClicked("+id+")\""+
						"id=\"CICD-"+id+"\">";
					tmp += rs.fieldByName("content");
					tmp += "<br clear='both'>"
					tmp += "</div>"; 

					tmp += "<div class=\"cdmFooter\"><span class='s0'>";
					tmp += __("Select:")+
						" <input type=\"checkbox\" "+
						"onclick=\"toggleSelectRowById(this, 'RROW-"+id+"')\" "+
						"class=\"feedCheckBox\" id=\"RCHK-"+id+"\">";

					tmp += "</span><span class='s1'>"+marked_pic+"</span> ";

/*					tmp += "<span class='s1'>"+
						"<img class='tagsPic' src='images/tag.png' alt='Tags' title='Tags'>"+
						"<span id=\"ATSTR-"+id+"\">"+rs.fieldByName("tags")+"</span>"+
						"</span>"; */

					tmp += "<span class='s2'>Toggle: <a class=\"cdmToggleLink\""+
						"href=\"javascript:toggleUnread("+id+")\">"+
						"Unread</a></span>";
					tmp += "</div>";

					tmp += "</div>";
				}

				rs.next();
				line_num++;
			}

			if (line_num - offset*30 < 30) {
				_infscroll_disable = 1;
			}

			rs.close();
	
			if (offset == 0) {
				tmp += "</table>";

				if (line_num - offset*30 == 0) {
					tmp += "<div class='whiteBox'>" +
						__("No articles found to display.") +
						"</div>";
				}
				tmp += "</div></div>";
			}
	
			if (offset == 0) {
				var container = document.getElementById("headlines-frame");
				container.innerHTML = tmp;
			} else {
				var ids = getSelectedArticleIds2();
		
				var container = document.getElementById("headlinesList");
				container.innerHTML = container.innerHTML + tmp;
	
				for (var i = 0; i < ids.length; i++) {
					markHeadline(ids[i]);
				}
			}
		}

		remove_splash();

		_infscroll_request_sent = 0;

	} catch (e) {
		exception_error("viewfeed_offline", e);
	}
}

function render_offline_feedlist() {
	try {
		var cats_enabled = getInitParam("enable_feed_cats") == "1";

		var tmp = "<ul class=\"feedList\" id=\"feedList\">";

		var unread = get_local_feed_unread(-4);

		global_unread = unread;
		updateTitle();

		if (cats_enabled) {
			var rs = db.execute("SELECT collapsed FROM categories WHERE id = -1");
			var cat_hidden = 0;

			if (rs.isValidRow()) {
				cat_hidden = rs.field(0);
			}

			rs.close();

			tmp += printCategoryHeader(-1, cat_hidden, false);
		}

		tmp += printFeedEntry(-4, __("All articles"), "feed", unread,
			"images/tag.png");

		var unread = get_local_feed_unread(-1);

		tmp += printFeedEntry(-1, __("Starred articles"), "feed", unread,
			"images/mark_set.png");

		if (cats_enabled) {
			tmp += "</ul></li>";
		} else {
			tmp += "<li><hr/></li>";
		}

/*		var rs = db.execute("SELECT feeds.id,feeds.title,has_icon,COUNT(articles.id) "+
			"FROM feeds LEFT JOIN articles ON (feed_id = feeds.id) "+
			"WHERE unread = 1 OR unread IS NULL GROUP BY feeds.id "+
			"ORDER BY feeds.title"); */

		var order_by = "feeds.title";

		if (cats_enabled) order_by = "categories.title," + order_by;

		var rs = db.execute("SELECT "+
			"feeds.id,feeds.title,has_icon,cat_id,collapsed "+
			"FROM feeds,categories WHERE cat_id = categories.id "+
			"ORDER BY "+order_by);

		var tmp_cat_id = -1;

		while (rs.isValidRow()) {

			var id = rs.field(0);
			var title = rs.field(1);
			var has_icon = rs.field(2);
			var unread = get_local_feed_unread(id);
			var cat_id = rs.field(3);
			var cat_hidden = rs.field(4);

			if (cat_id != tmp_cat_id && cats_enabled) {
				if (tmp_cat_id != -1) {
					tmp += "</ul></li>";
				}
				tmp += printCategoryHeader(cat_id, cat_hidden, false);
				tmp_cat_id = cat_id;
			}

			var icon = "";

			if (has_icon) {
				icon = "icons/" + id + ".ico";
			}

			var feed_icon = "";

			var row_class = "feed";

			if (unread > 0) {
				row_class += "Unread";
				fctr_class = "feedCtrHasUnread";
			} else {
				fctr_class = "feedCtrNoUnread";
			}

			tmp += printFeedEntry(id, title, "feed", unread, icon);

			rs.next();
		}

		rs.close();

		if (cats_enabled) {
			tmp += "</ul>";
		}

		tmp += "</ul>";

		render_feedlist(tmp);
	} catch (e) {
		exception_error("render_offline_feedlist", e);
	}
}

function init_offline() {
	try {
		offline_mode = true;

		Element.hide("dispSwitchPrompt");
		Element.hide("feedBrowserPrompt");

		Element.hide("topLinksOnline");
		Element.show("topLinksOffline");

		var tb_form = document.getElementById("main_toolbar_form");
		Element.hide(tb_form.update);

		var chooser = document.getElementById("quickMenuChooser");
		chooser.disabled = true;

		var rs = db.execute("SELECT key, value FROM init_params");

		while (rs.isValidRow()) {
			init_params[rs.field(0)] = rs.field(1);
			rs.next();
		}

		rs.close();

		var rs = db.execute("SELECT COUNT(*) FROM feeds");

		var num_feeds = 0;

		if (rs.isValidRow()) {
			num_feeds = rs.field(0);			
		}
		
		rs.close();

		if (num_feeds == 0) {
			remove_splash();
			return fatalError(0, 
				__("Data for offline browsing has not been downloaded yet."));
		}

		render_offline_feedlist();
		init_second_stage();
		window.setTimeout("viewfeed(-4)", 50);

	} catch (e) {
		exception_error("init_offline", e);
	}
}

function offline_download_parse(stage, transport) {
	try {
		if (transport.responseXML) {

			if (stage == 0) {

				var feeds = transport.responseXML.getElementsByTagName("feed");

				if (feeds.length > 0) {
					db.execute("DELETE FROM feeds");
				}

				for (var i = 0; i < feeds.length; i++) {
					var id = feeds[i].getAttribute("id");
					var has_icon = feeds[i].getAttribute("has_icon");
					var title = feeds[i].firstChild.nodeValue;
					var cat_id = feeds[i].getAttribute("cat_id");

					db.execute("INSERT INTO feeds (id,title,has_icon,cat_id)"+
						"VALUES (?,?,?,?)",
						[id, title, has_icon, cat_id]);
				}

				var cats = transport.responseXML.getElementsByTagName("category");

				if (feeds.length > 0) {
					db.execute("DELETE FROM categories");
				}

				for (var i = 0; i < cats.length; i++) {
					var id = cats[i].getAttribute("id");
					var collapsed = cats[i].getAttribute("collapsed");
					var title = cats[i].firstChild.nodeValue;

					db.execute("INSERT INTO categories (id,title,collapsed)"+
						"VALUES (?,?,?)",
						[id, title, collapsed]);
				}

				var labels = transport.responseXML.getElementsByTagName("label");

				if (labels.length > 0) {
					db.execute("DELETE FROM labels");
				}

				for (var i = 0; i < labels.length; i++) {
					var id = labels[i].getAttribute("id");
					var fg_color = labels[i].getAttribute("fg_color");
					var bg_color = labels[i].getAttribute("bg_color");
					var caption = labels[i].firstChild.nodeValue;

					db.execute("INSERT INTO labels (id,caption,fg_color,bg_color)"+
						"VALUES (?,?,?,?)",
						[id, caption, fg_color, bg_color]);
				}

				window.setTimeout("update_offline_data("+(stage+1)+")", 10*1000);
			} else {

				var articles = transport.responseXML.getElementsByTagName("article");

				var limit = transport.responseXML.getElementsByTagName("limit")[0];

				if (limit) {
					limit = limit.getAttribute("value");
				} else {
					limit = 0;
				}

				var articles_found = 0;

				for (var i = 0; i < articles.length; i++) {					
					var a = eval("("+articles[i].firstChild.nodeValue+")");
					articles_found++;
					if (a) {

						var date = new Date();
						var ts = Math.round(date.getTime() / 1000);

						db.execute("DELETE FROM articles WHERE id = ?", [a.id]);
						db.execute("INSERT INTO articles "+
						"(id, feed_id, title, link, guid, updated, content, "+
							"unread, marked, tags, added, comments) "+
						"VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)", 
							[a.id, a.feed_id, a.title, a.link, a.guid, a.updated, 
								a.content, a.unread, a.marked, a.tags, ts,
								a.comments]);

					}
				}

				debug("downloaded articles: " + articles_found + " limit: " + limit);

				if (articles_found >= limit) {
					window.setTimeout("update_offline_data("+(stage+1)+")", 10*1000);
					debug("update_offline_data: done " + stage);
				} else {
					window.setTimeout("update_offline_data(0)", 1800*1000);
					debug("update_offline_data: finished");

					var date = new Date();
					var ts = Math.round(date.getTime() / 1000);

					db.execute("DELETE FROM articles WHERE added < ? - 2592000", [ts]);

				}
			}

//			notify('');

		}
	} catch (e) {
		exception_error("offline_download_parse", e);
	}
}

function update_offline_data(stage) {
	try {

		if (!stage) stage = 0;
		if (offline_mode) return;

		debug("update_offline_data: stage " + stage);

//		notify_progress("Updating offline data... (" + stage +")", true);

		var query = "backend.php?op=rpc&subop=download&stage=" + stage;

		var rs = db.execute("SELECT MAX(id), MIN(id) FROM articles");

		if (rs.isValidRow() && rs.field(0)) {
			var offline_dl_max_id = rs.field(0);
			var offline_dl_min_id = rs.field(1);

			query = query + "&cidt=" + offline_dl_max_id;
			query = query + "&cidb=" + offline_dl_min_id;
		}

		rs.close();

		new Ajax.Request(query, {
			onComplete: function(transport) { 
				offline_download_parse(stage, transport);				
			} });

	} catch (e) {
		exception_error("initiate_offline_download", e);
	}
}

function set_feedlist_counter(id, ctr, is_cat) {
	try {

		var feedctr = document.getElementById("FEEDCTR-" + id);
		var feedu = document.getElementById("FEEDU-" + id);
		var feedr = document.getElementById("FEEDR-" + id);

		if (is_cat) {
			var catctr = document.getElementById("FCATCTR-" + id);
			if (catctr) {
				catctr.innerHTML = "(" + ctr + ")";
				if (ctr > 0) {
					catctr.className = "catCtrHasUnread";
				} else {
					catctr.className = "catCtrNoUnread";
				}
			}
		} else if (feedctr && feedu && feedr) {

			var row_needs_hl = (ctr > 0 && ctr > parseInt(feedu.innerHTML));

			feedu.innerHTML = ctr;

			if (ctr > 0) {					
				feedctr.className = "feedCtrHasUnread";
				if (!feedr.className.match("Unread")) {
					var is_selected = feedr.className.match("Selected");
	
					feedr.className = feedr.className.replace("Selected", "");
					feedr.className = feedr.className.replace("Unread", "");
	
					feedr.className = feedr.className + "Unread";
	
					if (is_selected) {
						feedr.className = feedr.className + "Selected";
					}	
					
				}

				if (row_needs_hl) { 
					new Effect.Highlight(feedr, {duration: 1, startcolor: "#fff7d5",
						queue: { position:'end', scope: 'EFQ-' + id, limit: 1 } } );
				}
			} else {
				feedctr.className = "feedCtrNoUnread";
				feedr.className = feedr.className.replace("Unread", "");
			}			
		}

	} catch (e) {
		exception_error("set_feedlist_counter", e);
	}
}

function update_local_feedlist_counters() {
	try {
		if (!offline_mode) return;

/*		var rs = db.execute("SELECT feeds.id,COUNT(articles.id) "+
			"FROM feeds LEFT JOIN articles ON (feed_id = feeds.id) "+
			"WHERE unread = 1 OR unread IS NULL GROUP BY feeds.id "+
			"ORDER BY feeds.title"); */

		var rs = db.execute("SELECT id FROM feeds "+
			"ORDER BY title");

		while (rs.isValidRow()) {
			var id = rs.field(0);
			var ctr = get_local_feed_unread(id);
			set_feedlist_counter(id, ctr, false);
			rs.next();
		}

		rs.close();

		var rs = db.execute("SELECT cat_id,SUM(unread) "+
			"FROM articles, feeds WHERE feeds.id = feed_id GROUP BY cat_id");

		while (rs.isValidRow()) {
			var id = rs.field(0);
			var ctr = rs.field(1);
			set_feedlist_counter(id, ctr, true);
			rs.next();
		}

		rs.close();

		set_feedlist_counter(-4, get_local_feed_unread(-4));
		set_feedlist_counter(-1, get_local_feed_unread(-1));

		hideOrShowFeeds(getInitParam("hide_read_feeds") == 1);

		global_unread = get_local_feed_unread(-4);
		updateTitle();

	} catch (e) {
		exception_error("update_local_feedlist_counters", e);
	}
}

function get_local_feed_unread(id) {
	try {
		var rs;

		if (id == -4) {
			rs = db.execute("SELECT SUM(unread) FROM articles");
		} else if (id == -1) {
			rs = db.execute("SELECT SUM(unread) FROM articles WHERE marked = 1");
		} else {
			rs = db.execute("SELECT SUM(unread) FROM articles WHERE feed_id = ?", [id]);
		}

		var a = false;

		if (rs.isValidRow()) {
			a = rs.field(0);
		} else {
			a = 0;
		}

		rs.close();

		return a;

	} catch (e) {
		exception_error("get_local_feed_unread", e);
	}
}

function init_gears() {
	try {

		if (window.google && google.gears) {
			localServer = google.gears.factory.create("beta.localserver");
			store = localServer.createManagedStore("tt-rss");
			db = google.gears.factory.create('beta.database');
			db.open('tt-rss');

			db.execute("CREATE TABLE IF NOT EXISTS version (schema_version text)");

			var rs = db.execute("SELECT schema_version FROM version");

			var version = "";

			if (rs.isValidRow()) {
				version = rs.field(0);
			}

			rs.close();

			if (version != SCHEMA_VERSION) {
				db.execute("DROP TABLE IF EXISTS init_params");
				db.execute("DROP TABLE IF EXISTS cache");
				db.execute("DROP TABLE IF EXISTS feeds");
				db.execute("DROP TABLE IF EXISTS categories");
				db.execute("DROP TABLE IF EXISTS labels");
				db.execute("DROP TABLE IF EXISTS article_labels");
				db.execute("DROP TABLE IF EXISTS articles");
				db.execute("DROP TABLE IF EXISTS version");
				db.execute("CREATE TABLE IF NOT EXISTS version (schema_version text)");
				db.execute("INSERT INTO version (schema_version) VALUES (?)", 
					[SCHEMA_VERSION]);
			}

			db.execute("CREATE TABLE IF NOT EXISTS init_params (key text, value text)");

			db.execute("CREATE TABLE IF NOT EXISTS cache (id text, article text, param text, added text)");
			db.execute("CREATE TABLE IF NOT EXISTS feeds (id integer, title text, has_icon integer, cat_id integer)");
			db.execute("CREATE TABLE IF NOT EXISTS categories (id integer, title text, collapsed integer)");
			db.execute("CREATE TABLE IF NOT EXISTS labels (id integer, caption text, fg_color text, bg_color text)");
			db.execute("CREATE TABLE IF NOT EXISTS article_labels (id integer, label_id integer)");
			db.execute("CREATE TABLE IF NOT EXISTS articles (id integer, feed_id integer, title text, link text, guid text, updated text, content text, tags text, unread text, marked text, added text, comments text)");

			db.execute("DELETE FROM cache WHERE id LIKE 'F:%' OR id LIKE 'C:%'");

			Element.show("restartOfflinePic");

		}	
	
		cache_expire();

	} catch (e) {
		exception_error("init_gears", e);
	}
}

function gotoOffline() {
	window.location.href = "tt-rss.php?offline=1";
}

function gotoOnline() {
	window.location.href = "tt-rss.php";
}

function local_collapse_cat(id) {
	try {
		if (db) {
			db.execute("UPDATE categories SET collapsed = NOT collapsed WHERE id = ?",
				[id]);
		}	
	} catch (e) {
		exception_error("local_collapse_cat", e);
	}
}

function get_local_category_title(id) {
	try {
		var rs = db.execute("SELECT title FROM categories WHERE id = ?", [id]);
		var tmp = "";

		if (rs.isValidRow()) {
			tmp = rs.field(0);
		}

		rs.close();

		return tmp;

	} catch (e) {
		exception_error("get_local_category_title", e);
	}
}

function get_local_category_unread(id) {
	try {
		var rs = db.execute("SELECT SUM(unread) FROM articles, feeds "+
			"WHERE feeds.id = feed_id AND cat_id = ?",
			[id]);

		var tmp = 0;

		if (rs.isValidRow()) {
			tmp = rs.field(0);
		}

		rs.close();

		return tmp;

	} catch (e) {
		exception_error("get_local_category_unread", e);
	}
}

function printCategoryHeader(cat_id, hidden, can_browse) {
	try {
		if (hidden == undefined) hidden = false;
		if (can_browse == undefined) can_browse = false;

			var tmp_category = get_local_category_title(cat_id);
			var tmp = "";

			var cat_unread = get_local_category_unread(cat_id);

			var holder_style = "";
			var ellipsis = "";

			if (hidden) {
				holder_style = "display:none;";
				ellipsis = "…";
			}

			var catctr_class = (cat_unread > 0) ? "catCtrHasUnread" : "catCtrNoUnread";

			var browse_cat_link = "";
			var inner_title_class = "catTitleNL";

			if (can_browse) {
				browse_cat_link = "onclick=\"javascript:viewCategory($cat_id)\"";
				inner_title_class = "catTitle";
			}

			var cat_class = "feedCat";

			tmp += "<li class=\""+cat_class+"\" id=\"FCAT-"+cat_id+"\">"+
				"<img onclick=\"toggleCollapseCat("+cat_id+")\" class=\"catCollapse\""+
					" title=\""+__('Click to collapse category')+"\""+
					" src=\"images/cat-collapse.png\"><span class=\""+inner_title_class+"\" "+
					" id=\"FCATN-"+cat_id+"\" "+browse_cat_link+
				"\">"+tmp_category+"</span>";

			tmp += "<span id=\"FCAP-"+cat_id+"\">";

			tmp += " <span id=\"FCATCTR-"+cat_id+"\" "+
				"class=\""+catctr_class+"\">("+cat_unread+")</span> "+ellipsis;

			tmp += "</span>";

			tmp += "<ul class=\"feedCatList\" id=\"FCATLIST-"+cat_id+"\" "+
				"style='"+holder_style+"'>";

			return tmp;
	} catch (e) {
		exception_error("printCategoryHeader", e);
	}
}