var defaultsettings =
{
	bgcolor: "white",
	fontfamily: "helvetica",
	fontsize: "16px",
	fontcolor: "rgb(55, 53, 47)",
	lineheight: "24px",
	accentcolor: "#5AA7CE",
	margins: "20%",
	savedelay: 2000,
	defaultpreviewinsplit: false,
	tagautocomplete: false,
	titleinaccentcolor: false,
	enablenetwork: true,
	titlebydefault: false,
	linksinnewtab: true,
	colors: true,
	bulletrendering: "•",
	password: "",
	sync: false,
	tagsinlists: true,
	tagfilter: "",
	darkcode: true
};

//builtin
var markerslist = ["* ", "- ", "    * ", "    - ", ">> ", "> ", "=> ", "— ", "[ ] ", "    ", "• ", "- [ ]"];
var codelanguages = ["xml", "js", "sql"];
var tagmark = "+";

// globals
var currentnote = null;
var fileindex = 0;
var workerid = null;
var backup = "";
var localdata = null;
var saved = true;
var lastsaved = "";
var pending = false;
var settings = null;
var tags = null;

var stat =
{
	ses:
	{
		q: 0,
		t: timestamp(),
		d: 0
	},
	cur:
	{
		q: 0,
		t: timestamp(),
		d: 0
	}
}

var commands = [
{
	hint: "Close menu"
},
{
	shortcut: "ctrl+p",
	hint: "Show notes list",
	action: searchandloadnote
},
{
	hint: "Share note",
	action: share,
	allowunsaved: true
},
{
	hint: "Share note (html)",
	action: sharehtml
},
{
	shortcut: "ctrl+n",
	hint: "New note",
	action: startnewnote
},
{
	shortcut: "ctrl+shift+P",
	hint: "Command palette",
	allowunsaved: true,
	action: commandpalette,
	excludepalette: true
},
{
	shortcut: "ctrl+g",
	hint: "Find in notes",
	action: showgrep
},
{
	shortcut: "ctrl+i",
	hint: "Toggle title",
	action: toggletitle,
	allowunsaved: true
},
{
	shortcut: "ctrl+m",
	hint: "Toggle preview",
	action: togglepreview,
	allowunsaved: true
},
{
	shortcut: "ctrl+shift+M",
	hint: "Toggle preview with merged subnotes",
	action: togglepreviewwithsubs,
	allowunsaved: true
},
{
	shortcut: "ctrl+d",
	hint: "Delete note",
	action: deletecurrentnote
},
{
	hint: "Restore current note",
	action: restore
},
{
	hint: "Insert markdown header",
	action: insertheader,
	allowunsaved: true
},
{
	hint: "Show help",
	action: showhelp
},
{
	hint: "Search tags",
	action: searchtags,
	shortcut: "ctrl+shift+T"
},
{
	hint: "Toggle split view",
	action: togglesplit
},
{
	hint: "Load previous note",
	action: loadprevious,
	shortcut: "ctrl+b"
},
{
	hint: "Load next note",
	action: loadnext,
	shortcut: "ctrl+shift+B"
},
{
	hint: "Settings",
	action: editsettings
},
{
	hint: "Change a setting",
	action: changesetting
},
{
	hint: "Restore default settings",
	action: restoresettings
},
{
	hint: "Note outline",
	action: showoutline,
	shortcut: "ctrl+o",
	allowunsaved: true
},
{
	hint: "Show connected notes",
	action: shownotelinks,
	shortcut: "ctrl+l"
},
{
	hint: "Add tag filter",
	action: addtagfilter,
	shortcut: "ctrl+shift+F",
},
{
	hint: "Show stats",
	action: showinfo,
	shortcut: "ctrl+w",
	allowunsaved: true
},
{
	hint: "Force save",
	action: save,
	shortcut: "ctrl+s",
	allowunsaved: true
},
{
	hint: "Toggle spell check",
	action: togglespellcheck,
	allowunsaved: true,
	shortcut: "F7"
},
{
	hint: "Create subnote from selection",
	action: createsubnote
},
{
	hint: "Merge subnote",
	action: includesub
},
{
	hint: "Comment selection",
	action: comment
},
{
	hint: "Download current note",
	action: downloadnote
},
{
	hint: "Download current note with merged subnotes",
	action: downloadnotewithsubs
},
{
	hint: "Download all notes (md files in zip archive)",
	action: downloadnotes,
	shortcut: "ctrl+shift+S"
},
{
	hint: "Download all notes (html files in zip archive)",
	action: downloadhtmlnotes
},
{
	hint: "Download all notes (json file)",
	action: downloadnotesjson
},
{
	hint: "Download all notes (encrypted json file)",
	action: downloadencrypted,
	remoteonly: true
},
{
	hint: "Insert text in todo",
	action: inserttodo
},
{
	hint: "Send an SMS",
	action: sms,
	remoteonly: true,
	allowunsaved: true
},
{
	hint: "Edit pgp keys",
	action: editpgpkeys
},
{
	hint: "Decrypt note",
	action: decryptnote
},
{
	hint: "Show upcoming events",
	action: showupcomingevents,
	remoteonly: true,
	shortcut: "ctrl+e"
},
{
	hint: "Restore deleted note",
	action: restoredeleted
},
{
	hint: "Notes by size",
	action: notesbysize
},
{
	hint: "Replace",
	shortcut: "ctrl+h",
	action: searchandreplace
},
{
	hint: "Sort todo.txt list",
	action: sorttodotxt
},
{
	hint: "Sort text",
	action: sortselection,
	allowunsaved: true
}];

var snippets = [
{
	command: "/code",
	hint: "Code block",
	insert: "```\n\n```",
	cursor: -4
},
{
	command: "/date",
	hint: "Current date",
	insert: (new Date).toISOString().substring(0, 10),
	cursor: 0
},
{
	command: "/bonjour",
	hint: "Standard answer (fr)",
	insert: "Bonjour ,\n\n\n\nBien cordialement,\nSimon",
	cursor: -29
},
{
	command: "/hello",
	hint: "Standard answer (en)",
	insert: "Hello ,\n\n\n\nKind regards,\nSimon",
	cursor: -24
},
{
	command: "/-",
	hint: "Dialog mark",
	insert: "— ",
	cursor: 0
},
{
	command: "/comment",
	hint: "Comment",
	insert: "<!--\n\n-->",
	cursor: -4
}];

function seteditorcontent(content, silent)
{
	md.value = content;
	applycolors();
	if (!silent)
	{
		datachanged();
	}
}

function encryptstring(str)
{
	console.log("encrypting...");
	var key = localStorage.getItem("pgpkeys").split("-----BEGIN PGP PRIVATE KEY BLOCK-----")[0];
	var publicKey = null;
	return openpgp.readKey({ armoredKey: key })
	.then(res =>
	{
		publicKey = res;
		return openpgp.createMessage({ text: str });
	})
	.then(message =>
	{
		return openpgp.encrypt({
			message: message,
			encryptionKeys: publicKey });
	});
}

function decryptstring(str)
{
	if (!str.startsWith("-----BEGIN PGP MESSAGE-----"))
	{
		// console.log(str + ": string is not encrypted");
		return Promise.resolve(str);
	}
	console.log("decrypting...");
	var key = localStorage.getItem("pgpkeys").split("-----END PGP PUBLIC KEY BLOCK-----")[1];
	var privateKey = null;
	return openpgp.readKey({ armoredKey: key })
	.then(res =>
	{
		privateKey = res;
		return openpgp.readMessage({ armoredMessage: str })
	})
	.then(message =>
	{
		return openpgp.decrypt({
			message: message,
			decryptionKeys: privateKey });
	})
	.then(decrypted =>
	{
		const chunks = [];
		for (const chunk of decrypted.data) {
			chunks.push(chunk);
		}
		return chunks.join('');
	})
}

function sms()
{
	var messsage = prompt("Type your message:");
	if (messsage)
	{
		queryremote({action: "sms", data: messsage})
		.then(data =>
		{
			showtemporaryinfo("SMS sent. Result: '" + data.result + "'");
		});
	}
}

function getnote(title)
{
	return localdata.find(note => note.title == title);
}

function getrangecontent(range)
{
	return md.value.substring(range.start, range.end);
}

function createsubnote()
{
	var title = prompt("Subnote tite:");
	if (!title)
	{
		showtemporaryinfo("No title provided");
		setpos(md.selectionStart);
		md.focus();
	}
	else if (getnote(title))
	{
		showtemporaryinfo("'" + title + "' already exists");
		setpos(md.selectionStart);
		md.focus();
	}
	else
	{
		var range =
		{
			start: md.selectionStart,
			end: md.selectionEnd
		}
		var content = getrangecontent(range);
		var newnote =
		{
			title: title,
			content: content
		}
		localdata.unshift(newnote);
		seteditorcontent(md.value.substring(0, range.start)
			+ "[[" + title + "]]"
			+ md.value.substring(range.end));
	}
}


function comment()
{
	seteditorcontent(md.value.substring(0, md.selectionStart)
		+ "<!-- "
		+ md.value.substring(md.selectionStart, md.selectionEnd)
		+ " -->"
		+ md.value.substring(md.selectionEnd));
}

function includesub()
{
	var range = linkrangeatpos();
	if (range)
	{
		var title = linkatpos();
		if (confirm("Replace [[" + title + "]] by its content?"))
		{
			var subnote = getnote(title);
			seteditorcontent(md.value.substring(0, range.start)
				+ subnote.content
				+ md.value.substring(range.end));

			if (confirm("Delete '" + title + "'?"))
			{
				deletenote(subnote);
			}
		}
	}
}

function togglespellcheck()
{
	md.spellcheck = !md.spellcheck;
}

function formatsize(size)
{
	var unit = "b";
	if (size > 1024)
	{
		size /= 1024;
		unit = "kb";
	}
	if (size > 1024)
	{
		size /= 1024;
		unit = "mb";
	}
	return size.toFixed(2) + " " + unit;
}

function pospercent()
{
	return md.value.length > 0 ?(100 * md.selectionStart / md.value.length).toFixed(2) : 100;
}

function showinfo()
{
	var tags = gettags(currentnote);
	showtemporaryinfo(
		[
			"sync: " + (settings.sync ? "en" : "dis") + "abled",
			"title: " + currentnote.title,
			"saved: " + saved + (lastsaved? " (" + lastsaved + ")": ""),
			"line count: " + md.value.split("\n").length,
			"word count: " + getwords(),
			"cursor position: " + md.selectionStart + " (" + pospercent() + "%)",
			(tags ? "tags: " + tags : ""),
			"current filter: " + settings.tagfilter || "",
			"current note start: " + stat.cur.t,
			"current note queries: " + stat.cur.q,
			"current note data sent: " + formatsize(stat.cur.d),
			"session start: " + stat.ses.t,
			"session queries: " + stat.ses.q,
			"session data sent: " + formatsize(stat.ses.d),
			"notes count: " + localdata.length,
			"spell check: " + (md.spellcheck ? "en" : "dis") + "abled"
		].join("\n"));
}

function savesettings()
{
	window.localStorage.setItem("settings", JSON.stringify(settings));
}

function removetaghint()
{
	return "Remove tag filter " + tagmark + settings.tagfilter;
}

function addtagfilter()
{
	var command = commands.find(c => c.action == addtagfilter);

	if (!settings.tagfilter)
	{
		tagslist()
		.then(t =>
			{
				settings.tagfilter = t;
				savesettings();
				command.hint = removetaghint();
				setwindowtitle();
			});
	}
	else
	{
		settings.tagfilter = "";
		savesettings();
		command.hint = "Add tag filter";
		setwindowtitle();
	}
}

function descendants(note)
{
	var list = [note];
	var result = [];

	while (list.length)
	{
		var current = list.shift();
		if (result.indexOf(current) == -1)
		{
			result.push(current);
			list = list.concat(children(current));
		}
	}
	return result;
}

function children(note)
{
	return (note.content
		.match(/\[\[([^\]]*)\]\]/g) || [])
		.map(l => l.replace("[[", "").replace("]]", ""))
		.filter(l => !l.includes("(deleted)"))
		.map(l => getnote(l));
}

function parents(note)
{
	return localdata
		.filter(n => n.content.indexOf("[[" + note.title + "]]") != -1);
}

function connected(note)
{
	var list = [note];
	var result = [];

	while (list.length)
	{
		var current = list.shift();
		if (result.indexOf(current) == -1)
		{
			result.push(current);
			list = list.concat(children(current)).concat(parents(current));
		}
	}
	return result;
}

function toggleeditor(hidden)
{
	md.hidden = hidden;

	if (settings.colors)
	{
		colored.hidden = hidden;
	}
}

function id(note)
{
	return localdata.indexOf(note);
}

function shownotelinks()
{
	if (settings.enablenetwork)
	{
		networkpage.hidden = false;
		toggleeditor(true);

		var nodes = [];
		var edges = [];

		var list = [currentnote];

		while (list.length)
		{
			var current = list.shift();
			if (!nodes.find(n => n.id == id(current)))
			{
				nodes.push(
					{
						id: id(current),
						label: current.title
					});

				var buddies = children(current).concat(parents(current));

				list = list.concat(buddies);

				buddies.
				forEach(buddy => {
					if (!edges.find(edge => (edge.to == id(current) && edge.from == id(buddy)) || (edge.to == id(buddy) && edge.from == id(current))))
					{
						edges.push({
							from: id(current),
							to: id(buddy)
						});
					}
				});
			}
		}

		var data = {
			nodes: nodes,
			edges: edges
		};

		var options =
		{
			nodes:
			{
				color:
				{
					background: settings.bgcolor,
					border: settings.fontcolor,
				},
				font:
				{
					color: settings.fontcolor,
					size: 16
				}
			}
		};

		var graph = new vis.Network(network, data, options);
		graph.on("click", function(event)
		{
			networkpage.hidden = true;
			toggleeditor(false);
			loadnote(nodes.find(n => n.id == event.nodes[0]).label);
		});
		graph.setSelection(
		{
			nodes : [id(currentnote)]
		});
	}
	else
	{
		searchinlist(connected(currentnote).map(n => n.title))
		.then(loadnote);
	}
}


function showoutline()
{
	var outline = {};
	var pos = 0;
	md.value.split("\n").forEach((line, index, lines) =>
	{
		pos += line.length + 1;
		if (line.startsWith("#"))
		{
			line = line
			.replace("# ", "")
			.replace(/#/g, "\xa0".repeat(4));
			outline[line] = pos;
		}
		else if (line == "---" && index != 0 && index != 3)
		{
			var next = lines.find((current, i) =>
			{
				return i > index && current != "";
			});
			if (next)
			{
				var nbcar = 80;
				next = next.length < nbcar ? next : next.substring(0, nbcar) + "...";
				outline[next] = pos;
			}
		}
	});

	var keys = Object
	.keys(outline)
	.sort((a,b) =>
		{
			return outline[a] - outline[b];
		});

	searchinlist(keys)
	.then(line =>
	{
		md.setSelectionRange(outline[line], outline[line]);
		md.focus();
	});
}

function linkrangeatpos()
{
	var start = md.value.lastIndexOf("[[", md.selectionStart);
	if (start == -1 || md.value.substring(start, md.selectionStart).indexOf("\n") != -1) return null

	var end = md.value.indexOf("]]", md.selectionStart);
	if (end == -1 || md.value.substring(md.selectionStart, end).indexOf("\n") != -1) return null;

	return {
		start: start,
		end: end + 2
	};
}

function linkatpos()
{
	var range = linkrangeatpos();
	if (range)
	{
		return md.value.substring(range.start + 2, range.end - 2);
	}
	return null;
}

function tagatpos()
{
	if (md.value.lastIndexOf("tags: ", md.selectionStart) < md.value.lastIndexOf("\n", md.selectionStart) || md.selectionStart < 6)
	{
		return null;
	}

	var start = md.value.lastIndexOf(" ", md.selectionStart);
	if (start == -1 || md.value.substring(start, md.selectionStart).indexOf("\n") != -1) return "";

	var eol = md.value.indexOf("\n", md.selectionStart);
	var end = md.value.indexOf(",", md.selectionStart);

	if (end == -1 || eol < end)
	{
		end = eol;
	}

	return md.value.substring(start + 1, end);
}

function clickeditor()
{
	if (!saved)
	{
		console.log("Not saved, ctrl+click ignored.");
		return;
	}
	if (event.ctrlKey)
	{
		var link = linkatpos();
		var tag = tagatpos();
		var word =  wordatpos();
		if (link)
		{
			loadnote(link);
		}
		else if (tag)
		{
			tagslist();
			searchinlist(tags[tag.toLowerCase()])
			.then(loadnote);
		}
		else if (word.startsWith("https://"))
		{
			window.open(word, '_blank');
		}
	}
}

function restoresettings()
{
	if (confirm("Restore default settings?"))
	{
		settings = defaultsettings;
		savesettings();
		loadsettings();
	}
}

function editsettings()
{
	bindfile(
	{
		title: "settings.json",
		content: JSON.stringify(settings, null, "    ")
	});
}

function editsetting(name)
{
	if (typeof settings[name] != "undefined")
	{
		var value = settings[name];
		var type = typeof value;
		if (type != "undefined")
		{
			value = prompt(name, value);
			if (value !== null)
			{
				if (type == "number")
				{
					value = parseInt(value);
				}
				else if (type == "boolean")
				{
					value = value === "true";
				}
				settings[name] = value;
				savesettings();
				loadsettings();
			}
		}
	}
}

function changesetting()
{
	searchinlist(Object.keys(settings).map(name => name + ": " + settings[name]))
	.then(setting =>
	{
		editsetting(setting.split(":").shift());
	});
}

function showupcomingevents()
{
	queryremote({action: "cal"})
	.then(data =>
	{
		if (!data.ics)
		{
			throw "could not retrieve events";
		}

		// keep future only
		var events = ics2json(data.ics)
		.filter(e => e.DTSTART >= new Date);

		// sort by years and months
		var sorted = {};
		events.forEach(event =>
		{
			var date = new Date(event.DTSTART);
			if (date >= new Date)
			{
				event.readabledate = date.toLocaleDateString('fr-FR', { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' });
				var month = event.readabledate.split(" ")[2];
				var year = event.readabledate.split(" ")[3];
				sorted[year] = sorted[year] || {};
				sorted[year][month] = sorted[year][month] || [];
				sorted[year][month].push(event);
			}
		});

		// build output
		var content = "";
		for (var year in sorted)
		{
			content += "# " + year + "\n";
			for (var month in sorted[year])
			{
				content += "## " + month.charAt(0).toUpperCase() + month.slice(1) + "\n";
				for (var i in sorted[year][month])
				{
					var event = sorted[year][month][i];
					if (i > 0 && event.DTSTART.getDate() != sorted[year][month][i-1].DTSTART.getDate() && event.DTSTART.getDay() <= sorted[year][month][i-1].DTSTART.getDay())
					{
						content += "\n\n";
					}
					content += event.readabledate.split(" ")[0] + " " + event.readabledate.split(" ")[1] + ": " + event.SUMMARY + "\n";
				}
			}
		}

		bindfile(
		{
			title: "Upcoming events",
			content
		});
		togglepreview();

	})
	.catch(remotecallfailed);
}

function decryptnote()
{
	decryptstring(md.value)
	.then(decrypted =>
	{
		seteditorcontent(decrypted);
		resize();
	});
}

function editpgpkeys()
{
	bindfile(
	{
		title: "pgpkeys",
		content: localStorage.getItem("pgpkeys") || ""
	});
}

function showtemporaryinfo(info)
{
	alert(info);
}

function getwords()
{
	return md.value.split(/\s+\b/).length;
}

function issplit()
{
	return window.location !== window.parent.location;
}

function togglesplit()
{
	if (issplit())
	{
		window.parent.location = "index.html";
	}
	else
	{
		window.location = "split.html";
	}
}

function tagslist()
{
	tags = {};

	localdata
	.forEach(n =>
	{
		var ts = gettags(n);
		ts.forEach(t =>
		{
			tags[t] = tags[t] || [];
			tags[t].push(n.title);
		});
	});

	return searchinlist(Object.keys(tags).sort());
}

function searchtags()
{
	tagslist()
	.then(tag => searchinlist(tags[tag]))
	.then(loadnote);
}

function gettags(note)
{
	var i = note.content.indexOf("tags: ");
	if (i > -1)
	{
		var j = note.content.indexOf("\n", i);
		return note.content.substring(i + 6, j)
			.split(",")
			.map(t => t.toLowerCase().trim())
			.filter(t => t.length);
	}
	return [];
}

function share()
{
	if (navigator.share)
	{
		navigator.share(
		{
			text: md.value,
			title: currentnote.title
		});
	}
}

function sharehtml()
{
	if (navigator.share)
	{
		var file = new File(['<html><body>' + md2html(md.value) + '</body></html>'],
			currentnote.title + ".html",
			{
				type: "text/html",
			});

		navigator.share(
		{
			title: currentnote.title,
			files: [file]
		});
	}
}

function getfilename(title)
{
	return title.replace(/[\?\"<>|\*:\/\\]/g, "_") + ".md";
}

function download(filename, content)
{
	var element = document.createElement('a');
	element.setAttribute('href', 'data:text/markdown;charset=utf-8,' + encodeURIComponent(content));
	element.setAttribute('download', filename);
	element.style.display = 'none';
	document.body.appendChild(element);
	element.click();
	document.body.removeChild(element);
	element = null;
}

function downloadnotes()
{
	var zip = new JSZip();
	localdata.forEach(note =>
	{
		zip.file(getfilename(note.title), note.content);
	});
	zip.generateAsync({type:"blob"})
	.then(function(content)
	{
		saveAs(content, "notes-" + timestamp() + ".zip");
	});
}

function downloadhtmlnotes()
{
	var zip = new JSZip();
	localdata.forEach(note =>
	{
		zip.file(getfilename(note.title).replace(".md", ".html"), md2html(note.content));
	});
	zip.generateAsync({type:"blob"})
	.then(function(content)
	{
		saveAs(content, "notes-html-" + timestamp() + ".zip");
	});
}

function headerandtext(note)
{
	var content = note.content;
	var result =
	{
		header: "",
		text: content
	};
	if (content.startsWith("---\n"))
	{
		var end = content.indexOf("---\n", 4);
		if (end > -1)
		{
			result.header = content.substring(0, end + 4);
			result.text = content.substring(end + 4);
		}
	}
	return result;
}

function inserttodo()
{
	var text = prompt("Text:");
	if (text)
	{
		var todo = getnote("todo");
		var split = headerandtext(todo);
		todo.content = split.header + "* " + text + "\n" + split.text;
		if (todo == currentnote)
		{
			seteditorcontent(todo.content, true);
		}
		datachanged();
	}
}

function downloadnotesjson()
{
	download("notes-" + timestamp() + ".json", window.localStorage.getItem("data"));
}

function downloadencrypted()
{
	encryptstring(JSON.stringify(localdata))
	.then(encrypted =>
	{
		download("notes-encrypted-" + timestamp() + ".acs", encrypted);
	});
}

function downloadnotewithsubs()
{
	var note = withsubs();
	if (note)
	{
		download(note.title + ".md", note.content);
	}
}

function downloadnote()
{
	download(currentnote.title + ".md", md.value);
}

function remotecallfailed(error)
{
	if (error)
	{
		console.warn(error);
		showtemporaryinfo("Error: " + error);
	}
	else
	{
		console.warn("remotecallfailed without details");
	}
}

function gotoline(line)
{
	var i = 0;
	var pos = 0;
	while (i < line && pos > -1)
	{
		pos = currentnote.content.indexOf("\n", pos + 1);
		i++;
	}
	if (pos > -1)
	{
		setpos(pos + 1);
	}
}

function loadstorage()
{
	var item = window.localStorage.getItem("data");
	localdata = item ? JSON.parse(item) : [];

	var params = new URLSearchParams(window.location.search);
	var title = params.get("n");
	var line = params.get("l");
	var tags = params.get("t");

	if (currentnote)
	{
		currentnote = getnote(currentnote.title);
	}
	else if (title)
	{
		currentnote = getnote(title);
		if (!currentnote)
		{
			var newcontent = defaultheaders(title, tags);
			currentnote = {title: title, content: newcontent, pos: newcontent.length};
			localdata.unshift(currentnote);
		}
	}

	if (currentnote)
	{
		bindfile(currentnote);
		if (line)
		{
			gotoline(line);
		}
	}
	else
	{
		loadlast();
	}
}

function applystyle()
{
	document.body.style.background = settings.bgcolor;
	document.body.style.fontFamily = settings.fontfamily;
	document.body.style.fontSize = settings.fontsize;
	document.body.style.lineHeight = settings.lineheight;
	document.body.style.color = settings.fontcolor;
	document.body.style.caretColor = settings.accentcolor;
	document.body.style.marginLeft = settings.margins;
	document.body.style.marginRight = settings.margins;

	if (settings.titleinaccentcolor)
	{
		title.style.color = settings.accentcolor;
	}
}

function loadsettings()
{
	settings = {...defaultsettings};
	var item = window.localStorage.getItem("settings");
	if (item)
	{
		item = JSON.parse(item);
		for (var key in settings)
		{
			if (typeof item[key] !== "undefined")
			{
				settings[key] = item[key];
			}
		}
	}

	applystyle();

	if (settings.tagfilter)
	{
		var command = commands.find(c  => c.hint == "Add tag filter");
		if (command)
		{
			command.hint = removetaghint();
		}
	}

	if (settings.titlebydefault && title.hidden)
	{
		toggletitle();
	}

	colored.hidden = !settings.colors;
	md.style.color = settings.colors ? "transparent" : "inherit";
	md.style.background = settings.colors ? "transparent" : "inherit";
}

function checksaved()
{
	if (!saved)
	{
		return "not saved";
	}
}

function initsnippets()
{
	// code languages
	codelanguages.forEach(lang =>
	{
		if (!snippets.find(s => s.command == "/" + lang))
		{
			snippets.push(
			{
				command: "/" + lang,
				hint: lang + " code block",
				insert: "```" + lang + "\n\n```",
				cursor: -4
			});
		}
	});
}

function init()
{
	loadsettings();

	window.onbeforeunload = checksaved;
	window.onclick = focuseditor;

	initsnippets();

	if (settings.sync)
	{
		if (localStorage.getItem("pgpkeys") && localStorage.getItem("pgpkeys").startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----"))
		{
			queryremote({action: "fetch"})
			.then(data =>
			{
				if (data.length)
				{
					window.localStorage.setItem("data", JSON.stringify(data));
				}
				loadstorage();
			})
			.catch(err =>
				{
					console.log(err);
					settings.password = prompt("Password: ", settings.password);
					savesettings();
					init();
				});
		}
		else
		{
			loadstorage();
			editpgpkeys();
			showtemporaryinfo("Pgp key empty or invalid. Enter PGP keys and refresh.");
		}
	}
	else
	{
		loadstorage();
	}

	if (issplit())
	{
		if (settings.defaultpreviewinsplit && name == "right")
		{
			togglepreview();
		}
		else if (name == "left")
		{
			md.focus();
		}
	}
}

function cvdt(text)
{
	var day = text.substr(0,8);
	var time = text.substr(9,6);
	return new Date(
		day.substr(0,4),
		parseInt(day.substr(4,2)) - 1,
		day.substr(6,2),
		time.substr(0,2),
		time.substr(2,2),
		time.substr(4,2));
}

function ics2json(ics)
{
	var events = [];
	ics.split("BEGIN:VEVENT").forEach(block =>
	{
		var evt = {};
		block.split("\r\n").forEach(line =>
		{
			var tuple = line.split(":");
			if (tuple.length > 1)
			{
				var field = tuple.shift().split(";")[0];
				var value = tuple.join(":");
				if (field == "DTSTART")
				{
					evt.DTSTART = cvdt(value);
				}
				else if (field == "UID" || field == "SUMMARY")
				{
					evt[field] = value;
				}
			}
		});

		if (evt.UID && evt.SUMMARY && evt.DTSTART)
		{
			events.push(evt);
		}
	});
	return events.sort( (a,b) => a.DTSTART - b.DTSTART);
}

function getorcreate(title, content, putontop)
{
	var note = getnote(title);
	if (!note)
	{
		note = {title: title, content: content, pos: content.length};
		localdata.push(note)
	}

	if (putontop)
	{
		localdata.splice(localdata.indexOf(note), 1);
		localdata.unshift(note);
	}
	return note;
}

function queryremote(params)
{
	return new Promise( (apply, failed) => {

		stat.cur.q++;
		stat.ses.q++;

		params.password = settings.password;

		var paramlist = [];
		for (var i in params)
		{
			paramlist.push(i + "=" + encodeURIComponent(params[i]));
		}

		stat.cur.d += paramlist.join("&").length;
		stat.ses.d += paramlist.join("&").length;

		var xhr = new XMLHttpRequest();
		xhr.open("POST", "handler.php");
		xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

		xhr.onerror = function()
		{
			failed("XMLHttpRequest error");
		}

		xhr.onload = function()
		{
			if (xhr.status !== 200)
			{
				failed("Http status " + xhr.status);
			}
			else
			{
				var data = {};

				decryptstring(xhr.responseText)
				.then(decrypted =>
				{
					data = JSON.parse(decrypted);

					if (data.error)
					{
						if (data.error == "authent")
						{
							failed("Authent failed");
						}
						else
						{
							failed("Remote handler returned an error: " + data.error);
						}
					}
					else if (data.warning)
					{
						console.warn("Remote warning: " + data.warning);
					}
					else
					{
						notepage.style.display = "table";
						apply(data);
					}
				})
				.catch( error =>
				{
					failed("Handler result is not valid. JS error: " + error);
				});
			}
		}

		xhr.send(paramlist.join("&"));
	});
}

function getlinesrange()
{
	var start = md.selectionStart;
	var end = md.selectionEnd;

	while (start > 0 && md.value[start - 1] != "\n") start--;
	while (end < md.value.length && md.value[end] != "\n") end++;

	return {
		start: start,
		end: end
	};
}

function sortselection()
{
	var content = md.value;
	var range = {start: 0, end: content.length};
	if (md.selectionStart != md.selectionEnd)
	{
		range = getlinesrange();
	}

	var selection = content.substring(range.start, range.end);
	var sorted = selection.split("\n").sort().join("\n");
	seteditorcontent(content.substring(0, range.start) + sorted + content.substring(range.end));
}

function wordatpos()
{
	var words = md.value.split(/\s/);
	var i = 0;
	var word = "";
	while (i < md.selectionStart)
	{
		word = words.shift();
		i += word.length + 1;
	}
	return word;
}

function ontopbarclick()
{
	if (title.hidden)
	{
		commandpalette();
	}
}

function md2html(content)
{
	var converter = new showdown.Converter();
	converter.setOption("simplifiedAutoLink", true);
	converter.setOption("simpleLineBreaks", true);
	converter.setOption("metadata", true);
	converter.setOption("tasklists", true);
	converter.setOption("literalMidWordUnderscores", true);

	if (settings.linksinnewtab)
	{
		converter.setOption("openLinksInNewWindow", true);
	}

	var html = converter.makeHtml(content);

	// internal links
	html = html.replace(/\[\[([^\]]*)\]\]/g, "<a href='#' onclick='loadnote(\"$1\");'>$1</a>");

	return html;
}

function loadlast()
{
	loadnote(localdata.length ? localdata[0].title : timestamp());
}

function loadprevious()
{
	var index = localdata.indexOf(currentnote);
	if (index > -1 && index < localdata.length - 1)
	{
		loadnote(localdata[index + 1].title);
	}
}

function loadnext()
{
	var index = localdata.indexOf(currentnote);
	if (index > -1 && index > 1)
	{
		loadnote(localdata[index - 1].title);
	}
}

function grep(needle)
{
	var result = {};

	localdata
	.filter(note => note.title != "events.json")
	.forEach(note =>
	{
		if (note.title.toLowerCase().includes(needle.toLowerCase()))
		{
			result[note.title] = {};
		}
		note.content.split("\n")
		.forEach((line, nb) => {
			if (line.toLowerCase().includes(needle.toLowerCase()))
			{
				result[note.title] = result[note.title] || {};
				result[note.title][nb] = line;
			}
		});
	});

	return result;
}

function showgrepresult(grepresult)
{
	var grepcontent = ["# Search results: \"" + filter.value + "\""];
	for (var file in grepresult)
	{
		grepcontent.push("[[" + file + "]]");
		for (var l in grepresult[file])
		{
			grepcontent.push("[<a href=?n=" + encodeURIComponent(file) + "&l=" + l + ">" + l + "</a>] " + grepresult[file][l]);
		}
		grepcontent.push("");
	}

	if (grepcontent.length == 0)
	{
		grepcontent.push("No result.");
	}

	bindfile(
	{
		title: "Search result",
		content: grepcontent.join("\n")
	});

	if (preview.hidden)
	{
		togglepreview();
	}
}

function showgrep()
{
	var text = prompt("Search:");
	if (text)
	{
		showgrepresult(grep(text));
	}
}

function titlewithtags(note)
{
	var text = note.title;
	if (settings.tagsinlists)
	{
		var tags = gettags(note);
		if (tags.length)
		{
			text += " " + tagmark + tags.join(" " + tagmark);
		}
	}
	return text;
}

function commandpalette()
{
	searchinlist(commands
		.filter(c => !c.excludepalette)
		.map(c => c.hint)
		.concat(snippets.map(s => "Insert snippet: " + s.hint))
		.concat(localdata.map(n => "Open note: " + titlewithtags(n)))
		.concat(Object.keys(settings).map(s => "Edit setting: " + s)))
	.then(hint =>
	{
		var command = commands.find(c => c.hint == hint);
		if (command)
		{
			executecommand(command);
		}
		else
		{
			var snippet = snippets.find(s => "Insert snippet: " + s.hint == hint);
			if (snippet)
			{
				insert(snippet.insert, snippet.cursor);
				md.focus();
			}
			else if (hint.startsWith("Open note: "))
			{
				loadnote(hint.replace("Open note: ", "").replace(new RegExp(" \\" + tagmark + ".*"), ""));
			}
			else if (hint.startsWith("Edit setting: "))
			{
				editsetting(hint.replace("Edit setting: ", ""));
			}
			else
			{
				// if unknown command, create a new note
				loadnote(hint);
			}
		}
	});
}

function insert(text, cursoroffset = 0, nbtodelete = 0)
{
	var pos = md.selectionStart;
	var content = md.value;
	seteditorcontent(
		content.substring(0, pos - nbtodelete)
		+ text
		+ content.substring(pos));
	setpos(pos - nbtodelete + text.length + cursoroffset);
}

function searchinlist(list, customevent, index)
{
	return new Promise(selectitem =>
	{
		fileindex = 0;
		searchdialog.hidden = false;
		filteredlist.hidden = false;

		filteredlist.innerHTML = "";
		filter.value = "";

		list.forEach(item =>
		{
			var elt = document.createElement("div");
			elt.textContent = item;
			elt.onclick = function()
			{
				searchdialog.hidden = true;
				selectitem(item);
			}
			elt.customevent = customevent;
			filteredlist.appendChild(elt);
		});

		applyfilter();
		if (index)
		{
			fileindex = index;
			applyfileindex();
		}

		filter.onkeydown = function()
		{
			// doesn't work if focus is lost.
			if (event.key === "Enter")
			{
				event.preventDefault();
				searchdialog.hidden = true;
				var selected = document.getElementsByClassName("selected")[0];
				selectitem(selected ? selected.textContent : filter.value);
			}
		}

		filter.focus();
	});
}

function applyfileindex()
{
	var i = 0;
	[...filteredlist.children].forEach(child =>
	{
		if (child.nodeName == "DIV")
		{
			child.className = "searchitem";
			if(!child.hidden)
			{
				if (i++ == fileindex)
				{
					child.className = "selected";
					if (child.customevent)
					{
						child.customevent(child.textContent);
						filter.focus();
					}
				}
			}
		}
	});
}

function getpos()
{
	return md.selectionStart;
}

function setpos(pos)
{
	md.setSelectionRange(pos, pos);
}

function before(nb)
{
	return md.value.substring(getpos() - nb, getpos());
}

function resize()
{
	if (md.clientHeight < md.scrollHeight)
	{
		md.style.height = md.scrollHeight + 'px';
	}
}

function putontop()
{
	if (localdata.find(n => n == currentnote))
	{
		localdata.splice(localdata.indexOf(currentnote), 1);
		localdata.unshift(currentnote);
	}
}

function postpone()
{
	return new Promise(function(resolve)
	{
		clearTimeout(workerid);
		workerid = setTimeout(resolve, settings.savedelay);
	});
}

function setsaved()
{
	saved = true;
	lastsaved = timestamp();
}

function save()
{
	clearTimeout(workerid);

	if (currentnote.title == "settings.json")
	{
		settings = JSON.parse(md.value);
		savesettings();
		loadsettings();
		setsaved();
		return;
	}
	else if (currentnote.title == "pgpkeys")
	{
		localStorage.setItem("pgpkeys", md.value);
		setsaved();
		return;
	}

	if (!localdata)
	{
		showtemporaryinfo("cannot push empty data");
		return;
	}

	if (pending)
	{
		console.log("pending query: save cancelled");
		return;
	}

	if (saved)
	{
		console.log("nothing to save");
		return;
	}

	var content = md.value;
	if ((content == "" && backup != "") || content == "null" || content == "undefined")
	{
		showtemporaryinfo("Invalid content '" + content + "', file '" + currentnote.title + "' not saved");
		return;
	}

	currentnote.pos = md.selectionStart;
	currentnote.content = content;
	putontop();

	window.localStorage.setItem("data", JSON.stringify(localdata));
	console.log("data serialized in local storage")

	if (settings.sync)
	{
		var datatosend = JSON.stringify(localdata);
		encryptstring(datatosend)
		.then(encrypted =>
		{
			console.log("sending data to php server...");
			pending = true;
			return queryremote({action: "push", data: encrypted})
		})
		.then(() =>
		{
			console.log("...data saved on server");
			setsaved();
		})
		.catch(remotecallfailed)
		.finally(() =>
		{
			pending = false;
			if (content != md.value)
			{
				console.log("but content changed: will save again");
				datachanged();
			}
			else if (!saved)
			{
				console.log("save failed. Data unsaved on server, manual action required.");
			}
		});
	}
	else
	{
		setsaved();
	}
}

function escapeHtml(unsafe) {
	return unsafe
		.replace(/&/g, "&amp;")
		.replace(/</g, "&lt;")
		.replace(/>/g, "&gt;")
		.replace(/"/g, "&quot;")
		.replace(/'/g, "&#039;");
 }

var languagekeywords = {
	"sql": ["select", "from", "where", "and", "or"],
	"js": ["var", "for", "if", "else"],
	"zsh": ["sudo"]
}

function currentline()
{
	return (md.value.substring(0, md.selectionStart).match(/\n/g) || []).length;
}

function lineatpos(pos)
{
	return (md.value.substring(0, pos).match(/\n/g) || []).length;
}

function currentcol()
{
	return md.selectionStart - Math.max(0, md.value.lastIndexOf("\n", md.selectionStart - 1)) - 1;
}

function rawline(index)
{
	return md.value.split("\n")[index];
}

var emptyline = "<br>";
function rawline2html(line, index, options)
{
	var shadow = "0.75px 0 0";
	line = escapeHtml(line);

	// headings
	if (line.startsWith("#"))
	{
		line = line.replace(/(#* )/, "<span style='color:" + settings.accentcolor + "'>$1</span>"); // to check!
		line = "<span style='text-shadow: " + shadow + ";'>" + line + "</span>";
	}

	// bold and italics
	var temp = line;
	if (line.startsWith("* "))
	{
		temp = line.substring(2);
	}
	temp = temp.replace(/\*\*([^\*]*)\*\*/g, "<span style='text-shadow: " + shadow + ";'>&#42;&#42;$1&#42;&#42;</span>");
	temp = temp.replace(/\*([^\*]*)\*/g, "<em>&#42;$1&#42;</em>");

	if (line.startsWith("* "))
	{
		line = "* " + temp;
	}
	else
	{
		line = temp;
	}

	// lists
	markerslist.forEach(marker =>
	{
		if (line.startsWith(marker))
		{
			line = line.replace(marker, "<span style='color:" + settings.accentcolor + "'>" + marker.replaceAll("*", settings.bulletrendering) + "</span>");
		}
	});

	// md header
	if (index == 0 && line == "---")
	{
		options.header = true;
	}
	if (options.header)
	{
		if (index > 0 && line == "---")
		{
			options.header = false;
		}
		line = line || emptyline;
		line = "<span style='color:lightgrey'>" + line + "</span>";
	}

	// code blocks
	if (line.startsWith("```") && !options.code)
	{
		options.code = true;
		options.language = line.substring(3);
		if (settings.darkcode)
		{
			line = "<div class='color-code'>" + line.replace(new RegExp("(" + options.language + ")"), "<span style='text-shadow: " + shadow + ";color:" + settings.accentcolor + ";'>$1</span>") + "</div>";
		}
	}
	else if (line == "```" && options.code)
	{
		options.code = false;
		options.language = "";
		if (settings.darkcode)
		{
			line = "<div class='color-code'>" + line + "</div>";
		}
	}
	else if (options.code)
	{
		if (settings.darkcode)
		{
			line = "<div class='color-code'>" + (line || emptyline) + "</div>";
		}
		if (languagekeywords[options.language])
		{
			var keywords = languagekeywords[options.language];
			keywords.forEach(keyword =>
			{
				line = line.replace(new RegExp("\\b(" + keyword + ")\\b", "ig"), "<span style='text-shadow: " + shadow + ";color:" + settings.accentcolor + "'>$1</span>");
			});
		}
	}

	// internal links
	line = line.replace(/\[\[(.*)\]\]/g, "[[<u>$1</u>]]");

	// comments
	line = line.replace(/&lt;\!--(.*)/g, "<span style='color:lightgrey'>&lt;!--$1</span>");

	if (line.includes("&lt;!--") && !line.includes("--&gt;"))
	{
		options.comment = true;
	}
	else if (options.comment)
	{
		line = line || emptyline;
		line = "<span style='color:lightgrey'>" + line
		if (line.includes("--&gt;"))
		{
			options.comment = false;
		}
		else
		{
			line += "</span>";
		}
	}

	line = line.replace(/\-\-&gt;/g, "--&gt;</span>");

	if (line.startsWith("// "))
	{
		line = "<span style='color:lightgrey'>" + line + "</span>";
	}

	// autocomplete snippets
	if (index == currentline())
	{
		var raw = rawline(index);
		var pos = currentcol();
		var slashpos = raw.substring(0, pos).lastIndexOf("/");
		if (slashpos > -1)
		{
			var spacepos = raw.substring(0, pos).lastIndexOf(" ");
			if (slashpos > spacepos)
			{
				var snippetpart = raw.substring(slashpos);
				var matching = snippets
				.filter(s => s.command.startsWith(snippetpart))
				.map(s => s.command.substring(1));

				line += "<span style='color:lightgrey'>";
				line += matching.join().substr(pos - slashpos - 1);
				line += "</span>";
			}
		}
	}

	// todo.txt
	if (currentistodo())
	{
		if (line.startsWith("x "))
		{
			line = "<del style='color:lightgrey'>" + line + "</del>";
		}
		else
		{
			line = line.replace(/(\(\w\))/g, "<span style='text-shadow: " + shadow + "; color:" + settings.accentcolor + "'>$1</span>");
			line = line.replace(/(@\w*)/g, "<span style='text-shadow: " + shadow + "; color:grey'>$1</span>");
			line = line.replace(/(\s\+\w*)/g, "<span style='color:grey'>$1</span>");
		}
	}
	return line;
}

function applycolors(currentonly)
{
	if (!settings.colors)
	{
		return;
	}

	var options =
	{
		header: false,
		code: false,
		comment: false,
		language: ""
	};

	var linediv = null;
	if (currentonly)
	{
		var index = currentline();
		linediv = document.getElementById("line" + index);
		options = JSON.parse(linediv.getAttribute("tag"));
		var line = rawline(index);
		line = rawline2html(line, index, options);
		linediv.innerHTML = line || emptyline;
	}
	else
	{
		console.log("redrawing all colored div");
		var lines = md.value.split("\n");
		var i = 0;
		for (; i < lines.length; i++)
		{
			linediv = document.getElementById("line" + i);
			if (!linediv)
			{
				linediv = document.createElement("div");
				colored.appendChild(linediv);
			}
			linediv.setAttribute("id", "line" + i);
			linediv.setAttribute("tag", JSON.stringify(options));
			linediv.innerHTML = rawline2html(lines[i], i, options) || emptyline;
		}

		// remove remanining
		linediv = document.getElementById("line" + (i++));
		while (linediv)
		{
			colored.removeChild(linediv);
			linediv = document.getElementById("line" + (i++));
		}
	}
}

function editorinput()
{
	// criteria to improve. Or redraw only after?
	var multiline = md.value.substring(md.selectionStart, md.selectionEnd).includes("\n");
	applycolors(!multiline && event.data && (event.inputType == "insertText" || event.inputType == "deleteContentBackward" || event.inputType == "deleteContentForward"));
	datachanged();
}

function datachanged()
{
	resize();

	saved = false;

	postpone()
	.then(save);
}

function timestamp()
{
	var utc = new Date();
	var loc = new Date(utc - utc.getTimezoneOffset() * 60 * 1000);

	return loc.toISOString().replace("T", " ").replace(/\..*/, "").replace(/:/g, ".");
}

function startnewnote()
{
	var title = prompt("Note title: ", timestamp());
	if (title)
	{
		loadnote(title);
		datachanged();
	}
}

function showhelp()
{
	var help = ["# Notes"];
	help.push("## Shortcuts");

	commands
	.filter(command => Boolean(command.shortcut))
	.forEach(command => help.push(command.hint + ": " + command.shortcut));

	help.push("## Snippets");
	snippets.forEach(snippet =>
	{
		help.push(snippet.hint + ": " + snippet.command);
	});

	help.push("## Libs");
	help.push("[Showdown](https://showdownjs.com/)");
	help.push("[vis-network](https://visjs.org/)");
	help.push("[openpgpjs](https://openpgpjs.org/)");
	help.push("[jszip](https://stuk.github.io/jszip/)");
	help.push("[FileSaver](http://eligrey.com)");

	help.push("## Inspiration");
	help.push("[rwtxt](https://rwtxt.com)");
	help.push("[Offline Notepad](https://offlinenotepad.com/)");
	help.push("[Writemonkey3](http://writemonkey.com/wm3/)");
	help.push("[Sublime Text](https://www.sublimetext.com/)");
	help.push("[Notion](https://www.notion.so/)");
	help.push("[Calmly Writer](https://calmlywriter.com/)");
	help.push("[Cryptee](https://crypt.ee/)");

	help.push("##Sources");
	help.push("https://github.com/quenousimporte/notes");

	bindfile(
	{
		title: "Help",
		content: help.join("\n")
	});

	if (preview.hidden)
	{
		togglepreview();
	}
}

function toggletitle()
{
	if (title.hidden)
	{
		title.hidden = false;
		title.focus();
	}
	else
	{
		title.hidden = true;
		md.focus();
	}
}

function selectnote()
{
	return searchinlist(
		localdata
		.map(n => titlewithtags(n))
		.filter(text => !settings.tagfilter || text.includes(tagmark + settings.tagfilter)));
}

function searchautocomplete()
{
	selectnote().then(selected =>
	{
		selected = selected.replace(new RegExp(" \\" + tagmark + ".*"), "");
		insertautocomplete(selected);
	});
}

function searchandloadnote()
{
	selectnote().then(selected =>
	{
		selected = selected.replace(new RegExp(" \\" + tagmark + ".*"), "");
		loadnote(selected);
	});
}

function currentistodo()
{
	return currentnote.title.includes("todo") || gettags(currentnote).includes("todo");
}

function sorttodotxt()
{
	if (currentistodo())
	{
		var hat = headerandtext(currentnote);
		var olditems = hat.text.split("\n");
		var prio = [];
		var std = [];
		var done = [];
		olditems.forEach(item =>
		{
			if (item)
			{
				if (item.startsWith("("))
				{
					item = item.substring(4);
					var priority = String.fromCharCode(65 + prio.length);
					prio.push(`(${priority}) ${item}`);
				}
				else if (item.startsWith("x "))
				{
					done.push(item);
				}
				else
				{
					std.push(item);
				}
			}
		});

		prio = prio.sort((a,b) => a.localeCompare(b));
		done = done.sort((a,b) => a.localeCompare(b));
		var all = prio.concat(std).concat(done);
		seteditorcontent(hat.header + all.join("\n"));
	}
}

function searchandreplace()
{
	var oldvalue = prompt("Search:");
	if (!oldvalue)
	{
		return;
	}

	var newvalue = prompt("Replace by:");
	if (!newvalue)
	{
		return;
	}

	var doit = confirm(`Replace '${oldvalue}' by '${newvalue}'?`);
	if (!doit)
	{
		return;
	}

	seteditorcontent(md.value.replaceAll(oldvalue, newvalue));
}

function notesbysize()
{
	var sortedtitles = localdata.sort( (n1,n2) => { return n2.content.length - n1.content.length})
	.map(n => n.title + ": " + formatsize(n.content.length));

	searchinlist(sortedtitles)
	.then(titlewithsize =>
	{
		var title = titlewithsize.substring(0, titlewithsize.lastIndexOf(": "));
		loadnote(title);
	});
}

function renamereferences(newname)
{
	localdata
	.filter(note => note != currentnote)
	.forEach(note =>
	{
		note.content = note.content.replaceAll("[[" + currentnote.title + "]]", "[[" + newname + "]]");
	});
}

function restoredeleted()
{
	var trash = window.localStorage.getItem("trash");
	if (trash)
	{
		trash = JSON.parse(window.localStorage.getItem("trash"));
		searchinlist(trash.map(note => note.title + " - deleted on " + note.deletiondate))
		.then(item =>
		{
			if (confirm("Restore " + item + "?"))
			{
				var title = item.split(" - deleted on ").shift();
				var stamp = item.split(" - deleted on ").pop();
				var index = trash.findIndex(n => n.title == title && (!n.deletiondate || n.deletiondate == stamp));
				if (index > -1)
				{
					var notetorestore = trash.splice(index, 1).pop();
					notetorestore.title += " - restored on " + timestamp();
					delete notetorestore.deletiondate;
					localdata.unshift(notetorestore);
					loadnote(notetorestore.title);
					datachanged();
					window.localStorage.setItem("trash", JSON.stringify(trash));
				}
			}
		});
	}
}

function deletenote(note)
{
	var trash = JSON.parse(window.localStorage.getItem("trash") || "[]");
	note.deletiondate = timestamp();
	trash.push(note);
	window.localStorage.setItem("trash", JSON.stringify(trash));

	localdata = localdata.filter(n => n != note);

	renamereferences(note.title + " (deleted)");
	datachanged();
}

function deletecurrentnote()
{
	if (confirm('delete "' + currentnote.title + '"?'))
	{
		deletenote(currentnote);
		loadlast();
	}
}

function restore()
{
	if (confirm('restore "' + currentnote.title + '"?'))
	{
		seteditorcontent(backup);
	}
}

function insertheader()
{
	if (preview.hidden && !md.value.startsWith("---\n"))
	{
		var headers = defaultheaders(currentnote.title);
		seteditorcontent(headers + md.value);
		setpos(27);
	}
	resize();
}

function splitshortcut(s)
{
	var r = {};
	s = s.split("+");
	r.key = s.pop();
	s.forEach(e => {
		r[e] = true;
	})
	return r;
}

function shortcutmatches(event, shortcut)
{
	var s = splitshortcut(shortcut);
	return (event.key == s.key && !(s.ctrl && !event.ctrlKey && !event.altKey) && !(s.shift && !event.shiftKey))
}

function executecommand(command)
{
	if (!command.allowunsaved && !saved)
	{
		showtemporaryinfo("Cannot perform '" + command.hint + "' because current note is not saved.");
	}
	else if (command.remoteonly && !settings.sync)
	{
		showtemporaryinfo(command.hint + " is not available in local mode.");
	}
	else if (command.action)
	{
		command.action();
	}
}

function esc(event)
{
	if (!searchdialog.hidden)
	{
		event.preventDefault();
		searchdialog.hidden = true;
		filter.placeholder = "Search...";
		md.focus();
	}
	else if (currentnote.title == "Help" || currentnote.title == "Search result")
	{
		loadlast();
	}
	else if (networkpage.hidden == false)
	{
		networkpage.hidden = true;
		toggleeditor(false);
	}
	else if (preview.hidden == false)
	{
		togglepreview();
	}
	else
	{
		commandpalette();
	}
}

function mainkeydownhandler()
{
	if (event.key == "Escape")
	{
		esc(event);
	}
	else if (!searchdialog.hidden && (event.key == "Tab" || event.keyCode == "40" || event.keyCode == "38"))
	{
		event.preventDefault();
		fileindex += (event.shiftKey || event.keyCode == "38") ? -1 : 1;
		fileindex = Math.min(fileindex, filteredlist.children.length - 1);
		fileindex = Math.max(fileindex, 0);
		applyfileindex();
	}
	else if (event.ctrlKey && event.key == " " || event.key == "F1")
	{
		commandpalette();
		event.preventDefault();
	}
	else if (event.ctrlKey && event.shiftKey && (event.keyCode == "40" || event.keyCode == "38"))
	{
		var pos = {
			start: md.selectionStart,
			end: md.selectionEnd
		};
		var direction = event.keyCode == "40" ? 1 : -1;
		var start = lineatpos(md.selectionStart);
		var end = lineatpos(md.selectionEnd);
		var lines = md.value.split("\n");
		if (direction > 0 && end < lines.length || direction < 0 && start > 0)
		{
			var block = lines.splice(start, end - start + 1);
			lines.splice(start + direction, 0, ...block);
			seteditorcontent(lines.join("\n"));
			var posshift = direction > 0 ? lines[start].length + 1 :  - 1 - lines[end].length;
			md.setSelectionRange(pos.start + posshift, pos.end + posshift);

		}
		event.preventDefault();
	}
	else if (event.ctrlKey || event.altKey)
	{
		// notes shortcuts
		var note = localdata.find(n =>
		{
			var shortcut = n.content.match(/shortcut: (.*)/);
			if (shortcut && shortcutmatches(event, shortcut[1]))
			{
				console.log("Loading note '" + n.title + "' from header shortcut " + shortcut[1]);
				event.preventDefault();
				loadnote(n.title);
				return true;
			}
			return false;
		});

		// commands shortcuts
		if (!note)
		{
			commands.filter(c => c.shortcut)
			.every(command =>
			{
				if (shortcutmatches(event, command.shortcut))
				{
					event.preventDefault();
					executecommand(command);
					return false;
				}
				return true;
			});
		}
	}
}

function setwindowtitle()
{
	document.title = (settings.tagfilter ? settings.tagfilter + " | " : "") + currentnote.title;
}

function ontitlechange()
{
	if (localdata.find(n => n.title == title.value))
	{
		showtemporaryinfo(title.value + " alreday exists");
		title.value = currentnote.title;
		return;
	}

	// rename internal references
	localdata
	.filter(note => note != currentnote)
	.forEach(note =>
	{
		note.content = note.content.replaceAll("[[" + currentnote.title + "]]", "[[" + title.value + "]]");
	});

	currentnote.title = title.value;

	datachanged();
	setwindowtitle();

	if (!settings.titlebydefault)
	{
		toggletitle();
	}
}

function simplifystring(str)
{
	return str.toLowerCase().normalize('NFD').replace(/\p{Diacritic}/gu, "");
}

function applyfilter()
{
	[...filteredlist.children].forEach(div =>
	{
		div.hidden = simplifystring(div.textContent).indexOf(simplifystring(filter.value)) < 0;
	});

	fileindex = 0;
	applyfileindex();
}

function backspace(nb)
{
	var pos = getpos();
	var c = md.value;
	seteditorcontent(c.substring(0, pos - nb) + c.substring(pos));
	setpos(pos - nb);
}

function editorkeydown()
{
	if (event.key == "Enter")
	{
		var line = md.value.substring(0, getpos()).split("\n").pop();
		markerslist.filter(marker => line.startsWith(marker))
		.every(marker =>
		{
			event.preventDefault();
			if (line != marker)
			{
				insert("\n" + marker);
			}
			else
			{
				backspace(marker.length);
			}
			return false;
		});
	}
	else if (event.key === "Tab")
	{
		event.preventDefault();
		var init = {
			start: md.selectionStart,
			end: md.selectionEnd
		};
		var range = getlinesrange();
		range.start--;
		range.end--;
		var selection = md.value.substring(range.start, range.end);
		var newtext;
		if (event.shiftKey)
		{
			newtext = selection.replaceAll("\n    ", "\n");
		}
		else
		{
			newtext = selection.replaceAll("\n", "\n    ");
		}
		seteditorcontent(md.value.substring(0, range.start)
			+ newtext
			+ md.value.substring(range.end));

		var shift = 0;
		if (newtext.length < selection.length)
		{
			shift = -4;
		}
		else if (newtext.length > selection.length)
		{
			shift = 4;
		}

		md.selectionStart = init.start + shift;
		md.selectionEnd = init.end + (newtext.length - selection.length);
	}
	else if (event.key === "[" && before(1) == "[")
	{
		event.preventDefault();
		insert("[");
		searchautocomplete();
	}
	else if (settings.tagautocomplete && event.key == " " && before(1) == "," && md.value.substring(0, getpos()).split("\n").pop().startsWith("tags: "))
	{
		event.preventDefault();
		// search in tags list
		console.log(event.key);
		tagslist()
		.then(tag =>
		{
			insert(" " + tag);
			md.focus();
		})
	}
	else
	{
		var snippet = snippets.find(s => before(s.command.length - 1) + event.key == s.command);
		if (snippet)
		{
			event.preventDefault();
			insert(snippet.insert, snippet.cursor, snippet.command.length - 1);
		}
	}
}

function insertautocomplete(selectednote)
{
	md.focus();
	insert(selectednote + "]] ");
}

function togglepreview()
{
	preview.innerHTML = md2html(md.value);
	toggleeditor(!md.hidden);
	preview.hidden = !preview.hidden;

	if (preview.hidden)
	{
		resize();
		md.focus();
	}
}

function withsubs()
{
	try
	{
		descendants(currentnote);
	}
	catch (err)
	{
		showtemporaryinfo(err);
		return null;
	}

	var tempnote =
	{
		title: currentnote.title + " (with subnotes)",
		content: md.value
	};

	var kids = children(tempnote);
	while (kids.length)
	{
		kids.forEach(kid =>
		{
			var kidcontent = kid.content;
			if (kidcontent.startsWith("---\n"))
			{
				var pos = kidcontent.indexOf("---\n", 4);
				kidcontent = kidcontent.substring(pos + 4);
			}
			tempnote.content = tempnote.content.replaceAll("[[" + kid.title + "]]", kidcontent);
		});
		kids = children(tempnote);
	}

	return tempnote;
}

function togglepreviewwithsubs()
{
	var note = withsubs();
	if (note)
	{
		preview.innerHTML = md2html(note.content);
		toggleeditor(!md.hidden);
		preview.hidden = !preview.hidden;

		if (preview.hidden)
		{
			resize();
			md.focus();
		}
	}
}

function bindfile(note)
{
	var changed = currentnote != note;

	backup = note.content;
	currentnote = note;
	title.value = note.title;
	setwindowtitle();

	seteditorcontent(note.content || "", true);

	if (changed)
	{
		md.style.height = "0px";
	}
	resize();

	// to improve...
	if (!issplit() && searchdialog.hidden)
	{
		md.focus();
	}

	setpos(note.pos || 0);
}

function defaultheaders(title, tags = "")
{
	return [
		"---",
		"title: " + title,
		"date: " + timestamp().substr(0,10),
		"tags: " + (tags || settings.tagfilter || ""),
		"---",
		"",""].join("\n");
}

function loadnote(name)
{
	var note = getorcreate(name, defaultheaders(name), true);
	bindfile(note);

	stat.cur.q = 0;
	stat.cur.d = 0;
	stat.cur.t = timestamp();

	if (!preview.hidden || (preview.hidden && gettags(note).indexOf("preview") !== -1))
	{
		togglepreview();
	}
}

function focuseditor()
{
	if (document.documentElement == event.srcElement)
	{
		md.focus();
		console.log("Forced focus");
	}
}