var _infscroll_disable = 0;
var _infscroll_request_sent = 0;

var _search_query = false;
var _viewfeed_last = 0;
var _viewfeed_timeout = false;

var counters_last_request = 0;
var _counters_prev = [];

/*function viewCategory(cat) {
	viewfeed({feed: cat, is_cat: true});
	return false;
}*/

function loadMoreHeadlines() {
	try {
		console.log("loadMoreHeadlines");

		var offset = 0;

		var view_mode = document.forms["main_toolbar_form"].view_mode.value;
		var unread_in_buffer = $$("#headlines-frame > div[id*=RROW][class*=Unread]").length;
		var num_all = $$("#headlines-frame > div[id*=RROW]").length;
		var num_unread = getFeedUnread(getActiveFeedId(), activeFeedIsCat());

		// TODO implement marked & published

		if (view_mode == "marked") {
			console.warn("loadMoreHeadlines: marked is not implemented, falling back.");
			offset = num_all;
		} else if (view_mode == "published") {
			console.warn("loadMoreHeadlines: published is not implemented, falling back.");
			offset = num_all;
		} else if (view_mode == "unread") {
			offset = unread_in_buffer;
		} else if (_search_query) {
			offset = num_all;
		} else if (view_mode == "adaptive" && !(getActiveFeedId() == -1 && !activeFeedIsCat())) {
			// ^ starred feed shows both unread & read articles in adaptive mode
			offset = num_unread > 0 ? unread_in_buffer : num_all;
		} else {
			offset = num_all;
		}

		console.log("offset: " + offset);

		viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat(), offset: offset, infscroll_req: true});

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

function cleanup_memory(root) {
	try {
		var dijits = dojo.query("[widgetid]", dijit.byId(root).domNode).map(dijit.byNode);

		dijits.each(function (d) {
			dojo.destroy(d.domNode);
		});

		$$("#" + root + " *").each(function (i) {
			i.parentNode ? i.parentNode.removeChild(i) : true;
		});
	} catch (e) {
		console.log("cleanup_memory: exception");
		console.log(e);
	}
}

function viewfeed(params) {
	try {
		var feed = params.feed;
		var is_cat = params.is_cat;
		var offset = params.offset;
		var background = params.background;
		var infscroll_req = params.infscroll_req;
		var can_wait = params.can_wait;
		var viewfeed_debug = params.viewfeed_debug;
		var method = params.method;

		if (is_cat == undefined)
			is_cat = false;
		else
			is_cat = !!is_cat;

		if (offset == undefined) offset = 0;
		if (background == undefined) background = false;
		if (infscroll_req == undefined) infscroll_req = false;

		last_requested_article = 0;

		if (feed != getActiveFeedId() || activeFeedIsCat() != is_cat) {
			if (!background && _search_query) _search_query = false;
		}

		if (!background) {
			_viewfeed_last = get_timestamp();

			if (getActiveFeedId() != feed || !infscroll_req) {
				setActiveArticleId(0);
				_infscroll_disable = 0;

				cleanup_memory("headlines-frame");
				_headlines_scroll_offset = 0;
			}

			if (infscroll_req) {
				var timestamp = get_timestamp();

				if (_infscroll_request_sent && _infscroll_request_sent + 30 > timestamp) {
					//console.log("infscroll request in progress, aborting");
					return;
				}

				_infscroll_request_sent = timestamp;
			}
		}

		Form.enable("main_toolbar_form");

		var toolbar_query = Form.serialize("main_toolbar_form");

		var query = "?op=feeds&method=view&feed=" + param_escape(feed) + "&" +
			toolbar_query;

		if (method) query += "&m=" + param_escape(method);

		if (offset > 0) {
			if (current_first_id) {
				query = query + "&fid=" + param_escape(current_first_id);
			}
		}

		if (!background) {
			if (_search_query) {
				force_nocache = true;
				query = query + "&" + _search_query;
				//_search_query = false;
			}

			if (offset != 0) {
				query = query + "&skip=" + offset;

				// to prevent duplicate feed titles when showing grouped vfeeds
				if (vgroup_last_feed) {
					query = query + "&vgrlf=" + param_escape(vgroup_last_feed);
				}
			} else {
				if (!is_cat && feed == getActiveFeedId() && !params.method) {
					query = query + "&m=ForceUpdate";
				}
			}

			Form.enable("main_toolbar_form");

			if (!setFeedExpandoIcon(feed, is_cat,
				(is_cat) ? 'images/indicator_tiny.gif' : 'images/indicator_white.gif'))
					notify_progress("Loading, please wait...", true);
		}

		query += "&cat=" + is_cat;

		console.log(query);

		if (can_wait && _viewfeed_timeout) {
			setFeedExpandoIcon(getActiveFeedId(), activeFeedIsCat(), 'images/blank_icon.gif');
			clearTimeout(_viewfeed_timeout);
		}

		setActiveFeedId(feed, is_cat);

		if (viewfeed_debug) {
			window.open("backend.php" + query + "&debug=1&csrf_token=" + getInitParam("csrf_token"));
		}

		timeout_ms = can_wait ? 250 : 0;
		_viewfeed_timeout = setTimeout(function() {

			new Ajax.Request("backend.php", {
				parameters: query,
				onComplete: function(transport) {
					setFeedExpandoIcon(feed, is_cat, 'images/blank_icon.gif');
					headlines_callback2(transport, offset, background, infscroll_req);
					PluginHost.run(PluginHost.HOOK_FEED_LOADED, [feed, is_cat]);
				} });
		}, timeout_ms); // Wait 250ms

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

function feedlist_init() {
	try {
		console.log("in feedlist init");

		loading_set_progress(50);

		document.onkeydown = hotkey_handler;
		setTimeout(hotkey_prefix_timeout, 5*1000);

		if (!getActiveFeedId()) {
			viewfeed({feed: -3});
		} else {
 			viewfeed({feed: getActiveFeedId(), is_cat: activeFeedIsCat()});
		}

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

		request_counters(true);
		timeout();

	} catch (e) {
		exception_error("feedlist/init", e);
	}
}


function request_counters(force) {
	try {
		var date = new Date();
		var timestamp = Math.round(date.getTime() / 1000);

		if (force || timestamp - counters_last_request > 5) {
			console.log("scheduling request of counters...");

			counters_last_request = timestamp;

			var query = "?op=rpc&method=getAllCounters&seq=" + next_seq();

			if (!force)
				query = query + "&last_article_id=" + getInitParam("last_article_id");

			console.log(query);

			new Ajax.Request("backend.php", {
				parameters: query,
				onComplete: function(transport) {
					try {
						handle_rpc_json(transport);
					} catch (e) {
						exception_error("request_counters", e);
					}
				} });

		} else {
			console.log("request_counters: rate limit reached: " + (timestamp - counters_last_request));
		}

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

// NOTE: this implementation is incomplete
// for general objects but good enough for counters
// http://adripofjavascript.com/blog/drips/object-equality-in-javascript.html
function counter_is_equal(a, b) {
	// Create arrays of property names
	var aProps = Object.getOwnPropertyNames(a);
	var bProps = Object.getOwnPropertyNames(b);

	// If number of properties is different,
	// objects are not equivalent
	if (aProps.length != bProps.length) {
		return false;
	}

	for (var i = 0; i < aProps.length; i++) {
		var propName = aProps[i];

		// If values of same property are not equal,
		// objects are not equivalent
		if (a[propName] !== b[propName]) {
			return false;
		}
	}

	// If we made it this far, objects
	// are considered equivalent
	return true;
}


function parse_counters(elems) {
	try {
		for (var l = 0; l < elems.length; l++) {

			if (_counters_prev[l] && counter_is_equal(elems[l], _counters_prev[l])) {
				continue;
			}

			var id = elems[l].id;
			var kind = elems[l].kind;
			var ctr = parseInt(elems[l].counter);
			var error = elems[l].error;
			var has_img = elems[l].has_img;
			var updated = elems[l].updated;
			var auxctr = parseInt(elems[l].auxcounter);

			if (id == "global-unread") {
				global_unread = ctr;
				updateTitle();
				continue;
			}

			if (id == "subscribed-feeds") {
				feeds_found = ctr;
				continue;
			}

			/*if (getFeedUnread(id, (kind == "cat")) != ctr ||
					(kind == "cat")) {
			}*/

			setFeedUnread(id, (kind == "cat"), ctr);
			setFeedValue(id, (kind == "cat"), 'auxcounter', auxctr);

			if (kind != "cat") {
				setFeedValue(id, false, 'error', error);
				setFeedValue(id, false, 'updated', updated);

				if (id > 0) {
					if (has_img) {
						setFeedIcon(id, false,
							getInitParam("icons_url") + "/" + id + ".ico");
					} else {
						setFeedIcon(id, false, 'images/blank_icon.gif');
					}
				}
			}
		}

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

		_counters_prev = elems;

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

function getFeedUnread(feed, is_cat) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree && tree.model)
			return tree.model.getFeedUnread(feed, is_cat);

	} catch (e) {
		//
	}

	return -1;
}

function getFeedCategory(feed) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree && tree.model)
			return tree.getFeedCategory(feed);

	} catch (e) {
		//
	}

	return false;
}

function hideOrShowFeeds(hide) {
	var tree = dijit.byId("feedTree");

	if (tree)
		return tree.hideRead(hide, getInitParam("hide_read_shows_special"));
}

function getFeedName(feed, is_cat) {

	if (isNaN(feed)) return feed; // it's a tag

	var tree = dijit.byId("feedTree");

	if (tree && tree.model)
		return tree.model.getFeedValue(feed, is_cat, 'name');
}

function getFeedValue(feed, is_cat, key) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree && tree.model)
			return tree.model.getFeedValue(feed, is_cat, key);

	} catch (e) {
		//
	}
	return '';
}

function setFeedUnread(feed, is_cat, unread) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree && tree.model)
			return tree.model.setFeedUnread(feed, is_cat, unread);

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

function setFeedValue(feed, is_cat, key, value) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree && tree.model)
			return tree.model.setFeedValue(feed, is_cat, key, value);

	} catch (e) {
		//
	}
}

function selectFeed(feed, is_cat) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree) return tree.selectFeed(feed, is_cat);

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

function setFeedIcon(feed, is_cat, src) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree) return tree.setFeedIcon(feed, is_cat, src);

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

function setFeedExpandoIcon(feed, is_cat, src) {
	try {
		var tree = dijit.byId("feedTree");

		if (tree) return tree.setFeedExpandoIcon(feed, is_cat, src);

	} catch (e) {
		exception_error("setFeedIcon", e);
	}
	return false;
}

function getNextUnreadFeed(feed, is_cat) {
	try {
		var tree = dijit.byId("feedTree");
		var nuf = tree.model.getNextUnreadFeed(feed, is_cat);

		if (nuf)
			return tree.model.store.getValue(nuf, 'bare_id');

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

function catchupCurrentFeed(mode) {
	catchupFeed(getActiveFeedId(), activeFeedIsCat(), mode);
}

function catchupFeedInGroup(id) {
	try {

		var title = getFeedName(id);

		var str = __("Mark all articles in %s as read?").replace("%s", title);

		if (getInitParam("confirm_feed_catchup") != 1 || confirm(str)) {

			var rows = $$("#headlines-frame > div[id*=RROW][data-orig-feed-id='"+id+"']");

			if (rows.length > 0) {

				rows.each(function (row) {
					row.removeClassName("Unread");

					if (row.getAttribute("data-article-id") != getActiveArticleId()) {
						new Effect.Fade(row, {duration: 0.5});
					}

				});

				var feedTitles = $$("#headlines-frame > div[class='cdmFeedTitle']");

				for (var i = 0; i < feedTitles.length; i++) {
					if (feedTitles[i].getAttribute("data-feed-id") == id) {

						if (i < feedTitles.length - 1) {
							new Effect.Fade(feedTitles[i], {duration: 0.5});
						}

						break;
					}
				}

				updateFloatingTitle(true);
			}

			var catchup_query = "?op=rpc&method=catchupFeed&feed_id=" +
					id + "&is_cat=false";

			console.log(catchup_query);

			notify_progress("Loading, please wait...", true);

			new Ajax.Request("backend.php", {
				parameters: catchup_query,
				onComplete: function (transport) {
					handle_rpc_json(transport);
				}
			} );

			//return viewCurrentFeed('MarkAllReadGR:' + id);
		}

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

function catchupFeed(feed, is_cat, mode) {
	try {
		if (is_cat == undefined) is_cat = false;

		var str = false;

		switch (mode) {
		case "1day":
			str = __("Mark all articles in %s older than 1 day as read?");
			break;
		case "1week":
			str = __("Mark all articles in %s older than 1 week as read?");
			break;
		case "2week":
			str = __("Mark all articles in %s older than 2 weeks as read?");
			break;
		default:
			str = __("Mark all articles in %s as read?");
		}

		var fn = getFeedName(feed, is_cat);

		str = str.replace("%s", fn);

		if (getInitParam("confirm_feed_catchup") == 1 && !confirm(str)) {
			return;
		}

		var catchup_query = "?op=rpc&method=catchupFeed&feed_id=" +
			feed + "&is_cat=" + is_cat + "&mode=" + mode;

		console.log(catchup_query);

		notify_progress("Loading, please wait...", true);

		new Ajax.Request("backend.php",	{
			parameters: catchup_query,
			onComplete: function(transport) {
					handle_rpc_json(transport);

					var show_next_feed = getInitParam("on_catchup_show_next_feed") == "1";

					if (show_next_feed) {
						var nuf = getNextUnreadFeed(feed, is_cat);

						if (nuf) {
							viewfeed({feed: nuf, is_cat: is_cat});
						}
					} else {
						if (feed == getActiveFeedId() && is_cat == activeFeedIsCat()) {
							viewCurrentFeed();
						}
					}

					notify("");
				} });

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

function decrementFeedCounter(feed, is_cat) {
	try {
		var ctr = getFeedUnread(feed, is_cat);

		if (ctr > 0) {
			setFeedUnread(feed, is_cat, ctr - 1);
			global_unread = global_unread - 1;
			updateTitle();

			if (!is_cat) {
				var cat = parseInt(getFeedCategory(feed));

				if (!isNaN(cat)) {
					ctr = getFeedUnread(cat, true);

					if (ctr > 0) {
						setFeedUnread(cat, true, ctr - 1);
					}
				}
			}
		}

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