var xmlhttp = false;

var active_feed_cat = false;
var active_label = false;
var active_tab = false;
var feed_to_expand = false;

var piggie_top = -400;
var piggie_fwd = true;

var xmlhttp = Ajax.getTransport();

var init_params = new Array();

var caller_subop = false;

function expand_feed_callback() {
	if (xmlhttp.readyState == 4) {
		try {	
			var container = document.getElementById("BRDET-" + feed_to_expand);	
			container.innerHTML=xmlhttp.responseText;
			container.style.display = "block";
//			p_notify("");
		} catch (e) {
			exception_error("expand_feed_callback", e);
		}
	}
}

function feedlist_callback() {
	if (xmlhttp.readyState == 4) {
		try {	
			var container = document.getElementById('prefContent');	
			container.innerHTML=xmlhttp.responseText;
			selectTab("feedConfig", true);

			if (caller_subop) {
				var tuple = caller_subop.split(":");
				if (tuple[0] == 'editFeed') {
					window.setTimeout('editFeed('+tuple[1]+')', 100);
				}				

				caller_subop = false;
			}

			notify("");
		} catch (e) {
			exception_error("feedlist_callback", e);
		}
	}
}

function filterlist_callback() {
	var container = document.getElementById('prefContent');
	if (xmlhttp.readyState == 4) {
		container.innerHTML=xmlhttp.responseText;
		notify("");
	}
}

function labellist_callback() {
	var container = document.getElementById('prefContent');
	if (xmlhttp.readyState == 4) {
		closeInfoBox();
		container.innerHTML=xmlhttp.responseText;
		if (active_label) {
			var row = document.getElementById("LILRR-" + active_label);
			if (row) {
				if (!row.className.match("Selected")) {
					row.className = row.className + "Selected";
				}		
			}
			var checkbox = document.getElementById("LICHK-" + active_label);
			
			if (checkbox) {
				checkbox.checked = true;
			}
		}
		notify("");
	}
}

function labeltest_callback() {
	var container = document.getElementById('label_test_result');
	if (xmlhttp.readyState == 4) {
		container.innerHTML=xmlhttp.responseText;
		notify("");
	}
}

function feed_browser_callback() {
	var container = document.getElementById('prefContent');
	if (xmlhttp.readyState == 4) {
		container.innerHTML=xmlhttp.responseText;
		notify("");
	}
}

function userlist_callback() {
	var container = document.getElementById('prefContent');
	if (xmlhttp.readyState == 4) {
		container.innerHTML=xmlhttp.responseText;
		notify("");
	}
}

function prefslist_callback() {
	var container = document.getElementById('prefContent');
	if (xmlhttp.readyState == 4) {

		container.innerHTML=xmlhttp.responseText;
		
		notify("");
	}
}

function gethelp_callback() {
	var container = document.getElementById('prefHelpBox');
	if (xmlhttp.readyState == 4) {

		container.innerHTML = xmlhttp.responseText;
		container.style.display = "block";

	}
}

function notify_callback() {
	if (xmlhttp.readyState == 4) {
		notify_info(xmlhttp.responseText);
	} 
}


function changepass_callback() {
	try {
		if (xmlhttp.readyState == 4) {
	
			if (xmlhttp.responseText.indexOf("ERROR: ") == 0) {
				notify_error(xmlhttp.responseText.replace("ERROR: ", ""));
			} else {
				notify_info(xmlhttp.responseText);
				var warn = document.getElementById("default_pass_warning");
				if (warn) warn.style.display = "none";
			}
	
			document.forms['change_pass_form'].reset();

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

function updateFeedList(sort_key) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	document.getElementById("prefContent").innerHTML = "Loading feeds, please wait...";

//	p_notify("Loading, please wait...");

	var feed_search = document.getElementById("feed_search");
	var search = "";
	if (feed_search) { search = feed_search.value; }

	xmlhttp.open("GET", "backend.php?op=pref-feeds" +
		"&sort=" + param_escape(sort_key) + 
		"&search=" + param_escape(search), true);
	xmlhttp.onreadystatechange=feedlist_callback;
	xmlhttp.send(null);

}

function updateUsersList(sort_key) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	document.getElementById("prefContent").innerHTML = "Loading feeds, please wait...";

//	p_notify("Loading, please wait...");

	xmlhttp.open("GET", "backend.php?op=pref-users&sort="
		+ param_escape(sort_key), true);
	xmlhttp.onreadystatechange=userlist_callback;
	xmlhttp.send(null);

}

function addLabel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var form = document.forms['label_edit_form'];

	var sql_exp = form.sql_exp.value;
	var description = form.description.value;

	if (sql_exp == "") {
		alert("Can't create label: missing SQL expression.");
		return false;
	}

	if (description == "") {
		alert("Can't create label: missing caption.");
		return false;
	}

	var query = Form.serialize("label_edit_form");

	xmlhttp.open("GET", "backend.php?op=pref-labels&subop=add&" + query, true);			
	xmlhttp.onreadystatechange=infobox_submit_callback;
	xmlhttp.send(null);
}

function addFeed() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var link = document.getElementById("fadd_link");

	if (link.value.length == 0) {
		alert(__("Error: No feed URL given."));
	} else if (!isValidURL(link.value)) {
		alert(__("Error: Invalid feed URL."));
	} else {
		notify_progress("Adding feed...");

		xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=add&from=tt-rss&feed_url=" +
			param_escape(link.value), true);
		xmlhttp.onreadystatechange=feedlist_callback;
		xmlhttp.send(null);

		link.value = "";

	}

}

function addFeedCat() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var cat = document.getElementById("fadd_cat");

	if (cat.value.length == 0) {
		alert(__("Can't add category: no name specified."));
	} else {
		notify_progress("Adding feed category...");

		xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=add&cat=" +
			param_escape(cat.value), true);
		xmlhttp.onreadystatechange=infobox_callback;
		xmlhttp.send(null);

		link.value = "";

	}

}
function addUser() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sqlexp = document.getElementById("uadd_box");

	if (sqlexp.value.length == 0) {
		alert("Can't add user: no login specified.");
	} else {
		notify_progress("Adding user...");

		xmlhttp.open("GET", "backend.php?op=pref-users&subop=add&login=" +
			param_escape(sqlexp.value), true);			
			
		xmlhttp.onreadystatechange=userlist_callback;
		xmlhttp.send(null);

		sqlexp.value = "";
	}

}

function editLabel(id) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

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

	document.getElementById("label_create_btn").disabled = true;

	active_label = id;

	selectTableRowsByIdPrefix('prefLabelList', 'LILRR-', 'LICHK-', false);
	selectTableRowById('LILRR-'+id, 'LICHK-'+id, true);

	xmlhttp.open("GET", "backend.php?op=pref-labels&subop=edit&id=" +
		param_escape(id), true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function editUser(id) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

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

	selectTableRowsByIdPrefix('prefUserList', 'UMRR-', 'UMCHK-', false);
	selectTableRowById('UMRR-'+id, 'UMCHK-'+id, true);

	xmlhttp.open("GET", "backend.php?op=pref-users&subop=edit&id=" +
		param_escape(id), true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function editFilter(id) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

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

	document.getElementById("create_filter_btn").disabled = true;

	selectTableRowsByIdPrefix('prefFilterList', 'FILRR-', 'FICHK-', false);
	selectTableRowById('FILRR-'+id, 'FICHK-'+id, true);

	xmlhttp.open("GET", "backend.php?op=pref-filters&subop=edit&id=" + param_escape(id), true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);
}

function editFeed(feed) {

//	notify("Editing feed...");

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

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

	// clean selection from all rows & select row being edited
	selectTableRowsByIdPrefix('prefFeedList', 'FEEDR-', 'FRCHK-', false);
	selectTableRowById('FEEDR-'+feed, 'FRCHK-'+feed, true);

	xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editfeed&id=" +
		param_escape(feed), true);

	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function editFeedCat(cat) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

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

	active_feed_cat = cat;

	xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=edit&id=" +
		param_escape(cat), true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function getSelectedLabels() {
	return getSelectedTableRowIds("prefLabelList", "LILRR");
}

function getSelectedUsers() {
	return getSelectedTableRowIds("prefUserList", "UMRR");
}

function getSelectedFeeds() {
	return getSelectedTableRowIds("prefFeedList", "FEEDR");
}

function getSelectedFilters() {
	return getSelectedTableRowIds("prefFilterList", "FILRR");
}

function getSelectedFeedCats() {
	return getSelectedTableRowIds("prefFeedCatList", "FCATR");
}

function getSelectedFeedsFromBrowser() {

	var list = document.getElementById("browseFeedList");
	if (!list) list = document.getElementById("browseBigFeedList");

	var selected = new Array();
	
	for (i = 0; i < list.childNodes.length; i++) {
		var child = list.childNodes[i];
		if (child.id && child.id.match("FBROW-")) {
			var id = child.id.replace("FBROW-", "");
			
			var cb = document.getElementById("FBCHK-" + id);

			if (cb.checked) {
				selected.push(id);
			}
		}
	}

	return selected;
}

function removeSelectedLabels() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedLabels();

	if (sel_rows.length > 0) {

		var ok = confirm("Remove selected labels?");

		if (ok) {
			notify_progress("Removing selected labels...");
	
			xmlhttp.open("GET", "backend.php?op=pref-labels&subop=remove&ids="+
				param_escape(sel_rows.toString()), true);
			xmlhttp.onreadystatechange=labellist_callback;
			xmlhttp.send(null);
		}
	} else {
		alert("No labels are selected.");
	}

	return false;
}

function removeSelectedUsers() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedUsers();

	if (sel_rows.length > 0) {

		var ok = confirm("Remove selected users?");

		if (ok) {
			notify_progress("Removing selected users...");
	
			xmlhttp.open("GET", "backend.php?op=pref-users&subop=remove&ids="+
				param_escape(sel_rows.toString()), true);
			xmlhttp.onreadystatechange=userlist_callback;
			xmlhttp.send(null);
		}

	} else {
		alert("No users are selected.");
	}

	return false;
}

function removeSelectedFilters() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedFilters();

	if (sel_rows.length > 0) {

		var ok = confirm("Remove selected filters?");

		if (ok) {
			notify_progress("Removing selected filters...");
	
			xmlhttp.open("GET", "backend.php?op=pref-filters&subop=remove&ids="+
				param_escape(sel_rows.toString()), true);
			xmlhttp.onreadystatechange=filterlist_callback;
			xmlhttp.send(null);
		}
	} else {
		alert("No filters are selected.");
	}

	return false;
}


function removeSelectedFeeds() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedFeeds();

	if (sel_rows.length > 0) {

		var ok = confirm("Unsubscribe from selected feeds?");

		if (ok) {

			notify_progress("Unsubscribing from selected feeds...");
	
			xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=remove&ids="+
				param_escape(sel_rows.toString()), true);
			xmlhttp.onreadystatechange=feedlist_callback;
			xmlhttp.send(null);
		}

	} else {

		alert("No feeds are selected.");

	}
	
	return false;
}

function removeSelectedFeedCats() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedFeedCats();

	if (sel_rows.length > 0) {

		var ok = confirm("Remove selected categories?");

		if (ok) {
			notify_progress("Removing selected categories...");
	
			xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=remove&ids="+
				param_escape(sel_rows.toString()), true);
			xmlhttp.onreadystatechange=infobox_callback;
			xmlhttp.send(null);
		}

	} else {

		alert("No categories are selected.");

	}

	return false;
}

function feedEditCancel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	closeInfoBox();

	selectPrefRows('feed', false); // cleanup feed selection

	return false;
}

function feedCatEditCancel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	active_feed_cat = false;

//	notify("Operation cancelled.");

	xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats", true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

	return false;
}

function feedEditSave() {

	try {
	
		if (!xmlhttp_ready(xmlhttp)) {
			printLockingError();
			return
		}

		// FIXME: add parameter validation

		var query = Form.serialize("edit_feed_form");

		notify_progress("Saving feed...");

		xmlhttp.open("POST", "backend.php", true);
		xmlhttp.onreadystatechange=feedlist_callback;
		xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xmlhttp.send(query);

		closeInfoBox();

		return false;

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

function feedCatEditSave() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	notify_progress("Saving category...");

	var query = Form.serialize("feed_cat_edit_form");

	xmlhttp.open("GET", "backend.php?" + query, true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

	active_feed_cat = false;

	return false;
}


function labelTest() {

	var container = document.getElementById('label_test_result');
	container.style.display = "block";
	container.innerHTML = "<p>Loading, please wait...</p>";

	var form = document.forms['label_edit_form'];

	var sql_exp = form.sql_exp.value;
	var description = form.description.value;

	xmlhttp.open("GET", "backend.php?op=pref-labels&subop=test&expr=" +
		param_escape(sql_exp) + "&descr=" + param_escape(description), true);

	xmlhttp.onreadystatechange=labeltest_callback;
	xmlhttp.send(null);

	return false;
}

function displayHelpInfobox(topic_id) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	notify_progress("Loading help...");

	xmlhttp.open("GET", "backend.php?op=help&tid=" +
		param_escape(topic_id) + "&noheaders=1", true);

	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function labelEditCancel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	document.getElementById("label_create_btn").disabled = false;

	active_label = false;

	selectPrefRows('label', false); // cleanup feed selection
	closeInfoBox();

	return false;
}

function userEditCancel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	selectPrefRows('user', false); // cleanup feed selection
	closeInfoBox();

	return false;
}

function filterEditCancel() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	document.getElementById("create_filter_btn").disabled = false;
	
	selectPrefRows('filter', false); // cleanup feed selection
	closeInfoBox();

	return false;
}

function labelEditSave() {

	var label = active_label;

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

/*	if (!is_opera()) {

		var sql_exp = document.forms["label_edit_form"].sql_exp.value;
		var description = document.forms["label_edit_form"].description.value;
	
		if (sql_exp.length == 0) {
			alert("SQL Expression cannot be blank.");
			return false;
		}
	
		if (description.length == 0) {
			alert("Caption field cannot be blank.");
			return false;
		}
	} */

	closeInfoBox();

	notify_progress("Saving label...");

	active_label = false;

	query = Form.serialize("label_edit_form");

	xmlhttp.open("GET", "backend.php?" + query, true);		
	xmlhttp.onreadystatechange=labellist_callback;
	xmlhttp.send(null);

	return false;
}

function userEditSave() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var login = document.forms["user_edit_form"].login.value;

	if (login.length == 0) {
		alert("Login field cannot be blank.");
		return;
	}
	
	notify_progress("Saving user...");

	closeInfoBox();

	var query = Form.serialize("user_edit_form");
	
	xmlhttp.open("GET", "backend.php?" + query, true);			
	xmlhttp.onreadystatechange=userlist_callback;
	xmlhttp.send(null);

	return false;
}


function filterEditSave() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

/*	if (!is_opera()) {
		var reg_exp = document.forms["filter_edit_form"].reg_exp.value;
	
		if (reg_exp.length == 0) {
			alert("Filter expression field cannot be blank.");
			return;
		}
	} */

	notify_progress("Saving filter...");

	var query = Form.serialize("filter_edit_form");

	closeInfoBox();

	document.getElementById("create_filter_btn").disabled = false;

	xmlhttp.open("GET", "backend.php?" + query, true);
	xmlhttp.onreadystatechange=filterlist_callback;
	xmlhttp.send(null);

	return false;
}

function editSelectedLabel() {
	var rows = getSelectedLabels();

	if (rows.length == 0) {
		alert(__("No labels are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one label."));
		return;
	}

	notify("");

	editLabel(rows[0]);

}

function editSelectedUser() {
	var rows = getSelectedUsers();

	if (rows.length == 0) {
		alert(__("No users are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one user."));
		return;
	}

	notify("");

	editUser(rows[0]);
}

function resetSelectedUserPass() {
	var rows = getSelectedUsers();

	if (rows.length == 0) {
		alert(__("No users are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one user."));
		return;
	}

	var ok = confirm(__("Reset password of selected user?"));

	if (ok) {
		notify_progress("Resetting password for selected user...");
	
		var id = rows[0];
	
		xmlhttp.open("GET", "backend.php?op=pref-users&subop=resetPass&id=" +
			param_escape(id), true);
		xmlhttp.onreadystatechange=userlist_callback;
		xmlhttp.send(null);
	}
}

function selectedUserDetails() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var rows = getSelectedUsers();

	if (rows.length == 0) {
		alert(__("No users are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one user."));
		return;
	}

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

	var id = rows[0];

	xmlhttp.open("GET", "backend.php?op=user-details&id=" + id, true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function selectedFeedDetails() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var rows = getSelectedFeeds();

	if (rows.length == 0) {
		alert(__("No feeds are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one feed."));
		return;
	}

//	var id = rows[0];

	notify("");

	xmlhttp.open("GET", "backend.php?op=feed-details&id=" + 
		param_escape(rows.toString()), true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function editSelectedFilter() {
	var rows = getSelectedFilters();

	if (rows.length == 0) {
		alert(__("No filters are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one filter."));
		return;
	}

	notify("");

	editFilter(rows[0]);

}


function editSelectedFeed() {
	var rows = getSelectedFeeds();

	if (rows.length == 0) {
		alert(__("No feeds are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select one feed."));
		return;
	}

	notify("");

	editFeed(rows[0]);

}

function editSelectedFeedCat() {
	var rows = getSelectedFeedCats();

	if (rows.length == 0) {
		alert(__("No categories are selected."));
		return;
	}

	if (rows.length > 1) {
		alert(__("Please select only one category."));
		return;
	}

	notify("");

	editFeedCat(rows[0]);

}

function piggie_callback() {
	var piggie = document.getElementById("piggie");

	piggie.style.top = piggie_top;
	piggie.style.backgroundColor = "white";
	piggie.style.borderWidth = "1px";

	if (piggie_fwd && piggie_top < 0) {
		setTimeout("piggie_callback()", 50);
		piggie_top = piggie_top + 10;
	} else if (piggie_fwd && piggie_top >= 0) {
		piggie_fwd = false;
		setTimeout("piggie_callback()", 50);
	} else if (!piggie_fwd && piggie_top > -400) {
		setTimeout("piggie_callback()", 50);
		piggie_top = piggie_top - 10;
	} else if (!piggie_fwd && piggie_top <= -400) {
		piggie.style.display = "none";
		piggie_fwd = true;
	}
}

var piggie_opacity = 0;

function piggie2_callback() {
	var piggie = document.getElementById("piggie");
	piggie.style.top = 0;
	piggie.style.opacity = piggie_opacity;
	piggie.style.backgroundColor = "transparent";
	piggie.style.borderWidth = "0px";

	if (piggie_fwd && piggie_opacity < 1) {
		setTimeout("piggie2_callback()", 50);
		piggie_opacity = piggie_opacity + 0.03;
	} else if (piggie_fwd && piggie_opacity >= 1) {
		piggie_fwd = false;
		setTimeout("piggie2_callback()", 50);
	} else if (!piggie_fwd && piggie_opacity > 0) {
		setTimeout("piggie2_callback()", 50);
		piggie_opacity = piggie_opacity - 0.03;
	} else if (!piggie_fwd && piggie_opacity <= 0) {
		piggie.style.display = "none";
		piggie_fwd = true;
	}
}

function localPiggieFunction(enable) {
	if (enable) {
		debug("I LOVEDED IT!");
		var piggie = document.getElementById("piggie");
		piggie.style.display = "block";

		if (navigator.userAgent.match("Gecko") && Math.random(1) > 0.5) {	
			piggie2_callback();
		} else {
			piggie_callback();
		}
	}
}

function validateOpmlImport() {
	
	var opml_file = document.getElementById("opml_file");

	if (opml_file.value.length == 0) {
		alert(__("No OPML file to upload."));
		return false;
	} else {
		return true;
	}
}

function updateFilterList(sort_key) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	document.getElementById("prefContent").innerHTML = "Loading filters, please wait...";

//	p_notify("Loading, please wait...");

	xmlhttp.open("GET", "backend.php?op=pref-filters&sort=" + 
		param_escape(sort_key), true);
	xmlhttp.onreadystatechange=filterlist_callback;
	xmlhttp.send(null);

}

function updateLabelList(sort_key) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	p_notify("Loading, please wait...");

//	document.getElementById("prefContent").innerHTML = "Loading labels, please wait...";

	xmlhttp.open("GET", "backend.php?op=pref-labels&sort=" + 
		param_escape(sort_key), true);
	xmlhttp.onreadystatechange=labellist_callback;
	xmlhttp.send(null);
}

function updatePrefsList() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	p_notify("Loading, please wait...");

	xmlhttp.open("GET", "backend.php?op=pref-prefs", true);
	xmlhttp.onreadystatechange=prefslist_callback;
	xmlhttp.send(null);

}

function selectTab(id, noupdate, subop) {

//	alert(id);

	if (!id) id = active_tab;

	try {

		if (!xmlhttp_ready(xmlhttp)) {
			printLockingError();
			return
		}

		try {
			var c = document.getElementById('prefContent');	
			c.scrollTop = 0;
		} catch (e) { };

		if (!noupdate) {

			debug("selectTab: " + id + "(NU: " + noupdate + ")");
	
			notify_progress("Loading, please wait...");
	
			// close active infobox if needed
			closeInfoBox();
	
			// clean up all current selections, just in case
			active_feed_cat = false;
			active_label = false;
	
			if (id == "feedConfig") {
				updateFeedList();
			} else if (id == "filterConfig") {
				updateFilterList();
			} else if (id == "labelConfig") {
				updateLabelList();
			} else if (id == "genConfig") {
				updatePrefsList();
			} else if (id == "userConfig") {
				updateUsersList();
			} else if (id == "feedBrowser") {
				updateBigFeedBrowser();
			}
		}
	
		var tab = document.getElementById(active_tab + "Tab");
	
		if (tab) {
			if (tab.className.match("Selected")) {
				tab.className = "prefsTab";
			}
		}
	
		tab = document.getElementById(id + "Tab");
	
		if (tab) {
			if (!tab.className.match("Selected")) {
				tab.className = tab.className + "Selected";
			}
		}
	
		active_tab = id;

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

function backend_sanity_check_callback() {

	if (xmlhttp.readyState == 4) {

		try {
		
			if (!xmlhttp.responseXML) {
				fatalError(3, "[D001, Received reply is not XML]: " + xmlhttp.responseText);
				return;
			}
	
			var reply = xmlhttp.responseXML.firstChild.firstChild;
	
			if (!reply) {
				fatalError(3, "[D002, Invalid RPC reply]: " + xmlhttp.responseText);
				return;
			}
	
			var error_code = reply.getAttribute("error-code");
		
			if (error_code && error_code != 0) {
				return fatalError(error_code, reply.getAttribute("error-msg"));
			}
	
			debug("sanity check ok");

			var params = reply.nextSibling;

			if (params) {
				debug('reading init-params...');
				var param = params.firstChild;

				while (param) {
					var k = param.getAttribute("key");
					var v = param.getAttribute("value");
					debug(k + " => " + v);
					init_params[k] = v;					
					param = param.nextSibling;
				}
			}

			init_second_stage();

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

function init_second_stage() {

	try {
		active_tab = getInitParam("prefs_active_tab");
		if (!active_tab) active_tab = "genConfig";

		document.onkeydown = pref_hotkey_handler;

		var tab = getURLParam('tab');
		
		caller_subop = getURLParam('subop');

		if (tab) {
			active_tab = tab;
		}

		if (navigator.userAgent.match("Opera")) {	
			setTimeout("selectTab()", 500);
		} else {
			selectTab(active_tab);
		}
		notify("");
	} catch (e) {
		exception_error("init_second_stage", e);
	}
}

function init() {

	try {
	
		if (arguments.callee.done) return;
		arguments.callee.done = true;		

		if (getURLParam('debug')) {
			document.getElementById('debug_output').style.display = 'block';
			debug('debug mode activated');
		}

		// IE kludge
		if (!xmlhttp) {
			document.getElementById("prefContent").innerHTML = 
				"<b>Fatal error:</b> This program needs XmlHttpRequest " + 
				"to function properly. Your browser doesn't seem to support it.";
			return;
		}

		xmlhttp.open("GET", "backend.php?op=rpc&subop=sanityCheck", true);
		xmlhttp.onreadystatechange=backend_sanity_check_callback;
		xmlhttp.send(null);

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

function categorizeSelectedFeeds() {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	var sel_rows = getSelectedFeeds();

	var cat_sel = document.getElementById("sfeed_set_fcat");
	var cat_id = cat_sel[cat_sel.selectedIndex].value;

	if (sel_rows.length > 0) {

		notify_progress("Changing category of selected feeds...");

		xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=categorize&ids="+
			param_escape(sel_rows.toString()) + "&cat_id=" + param_escape(cat_id), true);
		xmlhttp.onreadystatechange=feedlist_callback;
		xmlhttp.send(null);

	} else {

		alert(__("No feeds are selected."));

	}

}

function validatePrefsReset() {
	return confirm(__("Reset to defaults?"));
}

function browseFeeds(limit) {

	xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=browse", true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);

}

function feedBrowserSubscribe() {
	try {

		var selected = getSelectedFeedsFromBrowser();

		if (selected.length > 0) {
			closeInfoBox();
			xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=massSubscribe&ids="+
				param_escape(selected.toString()), true);
			xmlhttp.onreadystatechange=feedlist_callback;
			xmlhttp.send(null);
		} else {
			alert("No feeds are selected.");
		}

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

function updateBigFeedBrowser(limit) {

	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

//	p_notify("Loading, please wait...");

	var query = "backend.php?op=pref-feed-browser";

	var limit_sel = document.getElementById("feedBrowserLimit");

	if (limit_sel) {
		var limit = limit_sel[limit_sel.selectedIndex].value;
		query = query + "&limit=" + param_escape(limit);
	}

	xmlhttp.open("GET", query, true);
	xmlhttp.onreadystatechange=feed_browser_callback;
	xmlhttp.send(null);
}

function browserToggleExpand(id) {
	try {
/*		if (feed_to_expand && feed_to_expand != id) {
			var d = document.getElementById("BRDET-" + feed_to_expand);
			d.style.display = "none";
		} */

		if (!xmlhttp_ready(xmlhttp)) {
			printLockingError();
			return
		}

		var d = document.getElementById("BRDET-" + id);

		if (d.style.display == "block") {		
			d.style.display = "none";
			
		} else {
	
			feed_to_expand = id;

			d.style.display = "block";
			d.innerHTML = "Loading, please wait...";

			xmlhttp.open("GET", "backend.php?op=pref-feed-browser&subop=details&id="
				+ param_escape(id), true);
			xmlhttp.onreadystatechange=expand_feed_callback;
			xmlhttp.send(null);
		}

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

function selectPrefRows(kind, select) {

	if (kind) {
		var opbarid = false;	
		var nchk = false;
		var nrow = false;
		var lname = false;

		if (kind == "feed") {
			opbarid = "feedOpToolbar";
			nrow = "FEEDR-";
			nchk = "FRCHK-";			
			lname = "prefFeedList";
		} else if (kind == "fcat") {
			opbarid = "catOpToolbar";
			nrow = "FCATR-";
			nchk = "FCCHK-";
			lname = "prefFeedCatList";
		} else if (kind == "filter") {
			opbarid = "filterOpToolbar";
			nrow = "FILRR-";
			nchk = "FICHK-";
			lname = "prefFilterList";
		} else if (kind == "label") {
			opbarid = "labelOpToolbar";
			nrow = "LILRR-";
			nchk = "LICHK-";
			lname = "prefLabelList";
		} else if (kind == "user") {
			opbarid = "userOpToolbar";
			nrow = "UMRR-";
			nchk = "UMCHK-";
			lname = "prefUserList";
		}

		if (opbarid) {
			selectTableRowsByIdPrefix(lname, nrow, nchk, select);
			disableContainerChildren(opbarid, !select);
		}

	} 
}


function toggleSelectPrefRow(sender, kind) {

	toggleSelectRow(sender);

	if (kind) {
		var opbarid = false;	
		var nsel = -1;
		
		if (kind == "feed") {
			opbarid = "feedOpToolbar";
			nsel = getSelectedFeeds();
		} else if (kind == "fcat") {
			opbarid = "catOpToolbar";
			nsel = getSelectedFeedCats();
		} else if (kind == "filter") {
			opbarid = "filterOpToolbar";
			nsel = getSelectedFilters();
		} else if (kind == "label") {
			opbarid = "labelOpToolbar";
			nsel = getSelectedLabels();
		} else if (kind == "user") {
			opbarid = "userOpToolbar";
			nsel = getSelectedUsers();
		}

		if (opbarid && nsel != -1) {
			disableContainerChildren(opbarid, nsel == false);
		}

	} 
}

function toggleSelectFBListRow(sender) {
	toggleSelectListRow(sender);
	disableContainerChildren("fbrOpToolbar", getSelectedFeedsFromBrowser() == 0);
}

var seq = "";

function pref_hotkey_handler(e) {
	try {

		var keycode;
	
		if (!hotkeys_enabled) return;
	
		if (window.event) {
			keycode = window.event.keyCode;
		} else if (e) {
			keycode = e.which;
		}
	
		if (keycode == 13 || keycode == 27) {
			seq = "";
		} else {
			seq = seq + "" + keycode;
		}


	if (document.getElementById("piggie")) {
	
		if (seq.match("807371717369")) {
			seq = "";
			localPiggieFunction(true);
		} else {
			localPiggieFunction(false);
		}
	}

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

function userSwitch() {
	var chooser = document.getElementById("userSwitch");
	var user = chooser[chooser.selectedIndex].value;
	window.location = "prefs.php?swu=" + user;
}

function editFeedCats() {
	if (!xmlhttp_ready(xmlhttp)) {
		printLockingError();
		return
	}

	xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats", true);
	xmlhttp.onreadystatechange=infobox_callback;
	xmlhttp.send(null);
}

function showFeedsWithErrors() {
	displayDlg('feedUpdateErrors');
}

function changeUserPassword() {

	try {

		if (!xmlhttp_ready(xmlhttp)) {
			printLockingError();
			return false;
		}
	
		var query = Form.serialize("change_pass_form");
	
		notify_progress("Trying to change password...");
	
		xmlhttp.open("POST", "backend.php", true);
		xmlhttp.onreadystatechange=changepass_callback;
		xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xmlhttp.send(query);

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

function changeUserEmail() {

	try {

		if (!xmlhttp_ready(xmlhttp)) {
			printLockingError();
			return false;
		}
	
		var query = Form.serialize("change_email_form");
	
		notify_progress("Trying to change e-mail...");
	
		xmlhttp.open("POST", "backend.php", true);
		xmlhttp.onreadystatechange=notify_callback;
		xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xmlhttp.send(query);

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

}