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<!DOCTYPE html>
<html lang="en">
<!--
MIT License

Copyright (c) m15o

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
-->
<head>
    <meta charset="utf-8">
    <title>yon</title>
</head>
<style>
    html, body, #app, .column, textarea, table, td {
        height: 100%;
    }

    body {
        padding: 0;
        margin: 0;
        background-color: darkgoldenrod;
    }

    header {
        display: flex;
        border-bottom: 1px solid;
        border-top: 1px solid;
    }

    header > * {
        border-right: 1px solid;
    }

    .column {
        display: flex;
        flex-direction: column;
        min-width: 10px;
    }

    section {
        display: flex;
        flex-direction: column;
    }

    .name {
        box-sizing: border-box;
        width: 100%;
        padding: 2px 5px;
        margin: 0;
        outline: none;
        border: 0;
        border-right: 1px solid;
        background-color: lavender;
    }

    #search {
        display: none;
    }

    #search.searching {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background-color: darkblue;
        color: white;
    }

    textarea {
        box-sizing: border-box;
        padding: 5px;
        margin: 0;
        border: 0;
        outline: none;
        resize: none;
        background-color: bisque;
    }

    .action {
        padding: 2px 5px;
        cursor: pointer;
    }

    .back, .forward {
        background-color: silver;
    }

    .hist {
        background-color: inherit;
    }

    .folded .content {
        display: none;
        flex-shrink: 1;
    }

    section:not(.folded) {
        flex-grow: 1;
    }

    table {
        width: 100%;
        border-collapse: collapse;
    }

    td {
        padding: 0;
        border: 1px solid;
    }

    .menu {
        background-color: azure;
    }

    .menu > * {
        background-color: azure;
        padding: 0 4px;
        cursor: pointer;
    }

    .menu > *:hover {
        background-color: silver;
    }

    .active-p .content {
        background-color: white;
    }

    .active {
        background-color: turquoise;
    }

    .col {
        position: relative;
    }

    .resize:hover {
        background-color: rebeccapurple;
    }

    .resize {
        width: 2px;
        background-color: tan;
        cursor: col-resize;
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
    }

    #settings {
        display: none;
    }

    #settings.visible {
        display: table-row;
    }

    .dirty .save {
        background-color: aquamarine;
    }
</style>
<body>
<div id="app"></div>
<script>
    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Helpers

    function $(elt) {
        return document.querySelector(elt);
    }

    function $$(elt) {
        return document.querySelectorAll(elt);
    }

    function $$active(elt) {
        return $panel => ($panel && $panel.querySelector(elt)) || $('.active-p ' + elt);
    }

    function $name($panel) {
        return $$active('.name')($panel);
    }

    function $content($panel) {
        return $$active('.content')($panel);
    }

    function t$(e) {
        return e.target;
    }

    function closest$(e, sel) {
        return t$(e).closest(sel);
    }

    function $search() {
        return $('#search');
    }

    function $panel() {
        return $('.active-p');
    }

    function hasCls($elt, cls) {
        return $elt.classList.contains(cls);
    }

    function date() {
        return (new Date()).toLocaleDateString('en-CA');
    }

    function makeElt(elt, cls, attrs, html, value) {
        let e = document.createElement(elt);
        cls.forEach(c => e.classList.add(c));
        Object.keys(attrs).forEach(k => e.setAttribute(k, attrs[k]));
        html && (e.innerHTML = html);
        value && (e.value = value);
        return e;
    }

    function togCls(cls, sel, $elt) {
        $$(sel).forEach((e) => e.classList.remove(cls));
        $elt.classList.add(cls);
    }

    function setActive($section) {
        togCls('active-p', 'section', $section);
    }

    function closeSearch() {
        $search().classList.remove('searching');
        $content().focus();
    }

    function refPane(name) {
        let p;
        $$('section').forEach(e => e.querySelector('.name').value.startsWith('+ref') && (p = e));
        if (!p) {
            p = createPane();
        }
        setActive(p);
        load(name);
        return p;
    }

    function isChordNav(e) {
        return e.metaKey || e.ctrlKey;
    }

    function isChordNavBlank(e) {
        return isChordNav(e) && e.altKey;
    }

    function navBlank(name) {
        createPane();
        load(name);
    }

    function debounce(fn, ms) {
        let timeout;
        return (...args) => {
            clearTimeout(timeout);
            timeout = setTimeout(() => fn(...args), ms);
        }
    }

    function basename(path) {
        const n = path.split('/').pop();
        return n.split('.').shift();
    }

    function download(data, name, mime) {
        const link = document.createElement('a');
        link.download = name;
        link.href = window.URL.createObjectURL(new Blob([data], {type: mime}));
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // storage

    let store = {};

    function storeSet(k, v) {
        if (v === storeGet(k, v)) return;
        $('#app').classList.add('dirty');
        store[k] = v;
    }

    function storeGet(k) {
        return store[k] || '';
    }

    function storeDel(k) {
        delete store[k];
    }

    function storeKeys() {
        return Object.keys(store);
    }

    function storeClear() {
        store = {};
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Core

    function save() {
        let name = $name().value;
        let content = $content().value;
        $panel().dataset['name'] = name;
        if (!name || name[0] === '+') return;
        storeSet(name, content);
        refresh();
    }

    const saveD = debounce(save, 200);

    function updateHistory(name) {
        let cname = $panel().dataset['name'];
        if (!name || name === cname) return;
        hpush(hist().back, cname);
        hist().forward = [];
    }

    function ls(prefix) {
        return storeKeys().filter(k => !prefix || k.startsWith(prefix)).map(k => '[[' + k + ']]').join('\n');
    }

    function load(name, noHist) {
        if (!name) {
            $name().value = '';
            $content().value = '';
            return;
        }
        !noHist && updateHistory(name)
        if (name.startsWith('+ls')) {
            $content().value = ls(name.split(':')[1]);
        } else if (name.startsWith('+ref')) {
            $content().value = ref(name.split(':')[1]);
        } else {
            $content().value = storeGet(name);
        }
        $name().value = name;
        $panel().dataset['name'] = name;
        $panel().querySelector('.back').classList.toggle('hist', !!hist().back.length);
        $panel().querySelector('.forward').classList.toggle('hist', !!hist().forward.length);
    }

    function refresh() {
        const $elt = $('#files');
        $elt.innerHTML = '';
        storeKeys().forEach(k => $elt.appendChild(makeElt('option', [], {}, null, k)));
    }

    let paneID = 0;

    function createHistory(paneID) {
        history[paneID] = {back: [], forward: []};
    }

    function removeHistory(paneID) {
        delete history[paneID];
    }

    function deletePane($pane) {
        removeHistory($pane.dataset['id']);
        $pane.remove();
    }

    function createPane() {
        const header = document.createElement('header');
        header.append(
            makeElt('span', ['back', 'action'], {}, '<'),
            makeElt('span', ['forward', 'action'], {}, '>'),
            makeElt('input', ['name'], {list: 'files', autocomplete: 'off'}),
            makeElt('span', ['fold', 'action'], {}, '-'),
            makeElt('span', ['max', 'action'], {}, '+'),
            makeElt('span', ['move', 'action'], {}, '~'),
            makeElt('span', ['close', 'action'], {}, 'x')
        );
        const id = paneID++;
        const section = document.createElement('section');
        section.setAttribute('data-id', '' + id);
        section.append(
            header,
            makeElt('textarea', ['content'], {spellcheck: false, onkeyup: 'saveD()'})
        )
        createHistory(id);
        $(".column.active").appendChild(section);
        setActive(section);
        $content().focus();
        return section;
    }

    function ref(str) {
        return storeKeys().map(k => {
            const v = storeGet(k);
            const m = v.split('\n').filter(l => l.includes('[[' + str + ']]'));
            if (!m.length) return null;
            return ['[[' + k + ']]', '----------', ...m, ''].join('\n');
        }).filter(Boolean).join('\n');
    }

    function mv(before, after) {
        return storeKeys().forEach(k => {
            const v = storeGet(k);
            storeSet(k, v.replaceAll('[[' + before + ']]', '[[' + after + ']]'))
        })
    }

    function link(textarea) {
        const text = textarea.value;
        const pos = textarea.selectionStart;
        let start, end;

        for (start = pos; start > -1 && text[start] !== '['; start--) {
            if (/\n/.test(text[start]) || text[start] === ']') return null;
        }
        if (start === -1) return null;

        for (end = pos; end < text.length && text[end] !== ']'; end++) {
            if (/\n/.test(text[end]) || text[end] === '[') return null;
        }
        if (end === text.length) return null;

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

    function insert(textarea, text) {
        const start = textarea.selectionStart;
        const end = textarea.selectionEnd;
        const before = textarea.value.substring(0, start);
        const after = textarea.value.substring(end, textarea.value.length);

        textarea.value = before + text + after;
        textarea.selectionStart = textarea.selectionEnd = start + text.length;
    }

    const history = {};

    function hist() {
        return history[$panel().dataset['id']];
    }

    function hpush(h, name) {
        if (h[h.length - 1] === name) return;
        h.push(name);
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Menu

    function menuNew() {
        createPane();
    }

    function menuLog() {
        $name() || createPane();
        load(date());
    }

    function menuLs() {
        load('+ls');
    }

    function menuReset() {
        if (confirm('delete everything?')) {
            storeClear();
        }
    }

    function menuRef() {
        refPane('+ref:' + $name().value);
    }

    function menuMv() {
        let prev = $panel().dataset['name'];
        mv(prev, $name().value);
        save();
        storeDel(prev);
        $prevPanel = $panel();
        $$('section').forEach($pane => {
            setActive($pane);
            load($name().value, false);
        })
        setActive($prevPanel);
        refresh();
    }

    function quine() {
        const regex = /let store = (.*)/;
        return ['<!DOCTYPE html>',
            document.documentElement.outerHTML.replace(regex, "let store = " + JSON.stringify(store)
                .replaceAll('</' + 'script', "' + '</' + 'script' + '") + ';')].join('\n');
    }

    function menuSave() {
        $('#app').classList.remove('dirty');
        download(quine(), basename(window.location.href) + '.html', 'text/html');
    }

    function menuExport() {
        download(JSON.stringify(store), basename(window.location.href) + '.json', 'text/json');
    }

    function menuDel() {
        let name = $name().value;
        if (name && confirm('delete ' + name + '?')) {
            storeDel(name);
            refresh();
            deletePane($panel());
        }
    }

    function menuSettings() {
        $('#settings').classList.toggle('visible');
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Pane actions

    function paneFold(e) {
        closest$(e, 'section').classList.toggle('folded');
    }

    function paneMax(e) {
        closest$(e, '.column').querySelectorAll("section").forEach(e => e.classList.add("folded"));
        closest$(e, 'section').classList.remove("folded");
    }

    function paneMove(e) {
        let $c;
        $$('.column').forEach(c => {
            if (c !== closest$(e, '.column')) $c = c;
        });
        $c.appendChild(closest$(e, 'section'));
    }

    function paneClose(e) {
        deletePane(closest$(e, 'section'));
    }

    function paneHist(from, to) {
        return function (e) {
            if (!from.length) return;
            let name = from.pop();
            if (isChordNavBlank(e)) {
                from.push(name);
                createPane();
            } else if (isChordNav(e)) {
                setActive($prevPanel);
                load(name);
                $content().focus();
            } else {
                hpush(to, $panel().dataset['name']);
            }
            load(name, true);
        }
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Listeners

    let $prevPanel;
    let $resize;

    function handleSearch(e) {
        e.preventDefault();
        e.stopPropagation();
        if (isChordNavBlank(e)) {
            navBlank(t$(e).value);
            closeSearch();
        } else if (isChordNav(e)) {
            if (!$content()) createPane();
            closeSearch();
            load(t$(e).value);
        } else {
            if (!$content()) return;
            closeSearch();
            insert($content(), "[[" + t$(e).value + "]]");
        }
    }

    document.getElementById('app').innerHTML = `
 <datalist id="files"></datalist>
<table>
    <tr>
        <td colspan="2" class="menu" style="height: 0;">
            <span class="new">new</span><span class="log">log</span><span class="ls">ls</span><span
                class="ref">ref</span><span class="mv">mv</span><span class="del">del</span><span class="save">save</span><span class="settings">import</span><span class="export">export</span><span class="reset">reset</span>
        </td>
    </tr>
    <tr id="settings">
        <td colspan="2" class="menu" style="height: 0;">
            <input type="file" id="import" value="">
        </td>
    </tr>
    <tr>
        <td class="col">
            <div class="active column"></div>
            <div class="resize"></div>
        </td>
        <td>
            <div class="column"></div>
        </td>
    </tr>
</table>
<input list="files" spellcheck="false" id="search" autocomplete="off"/>
    `;

    document.addEventListener('mousedown', function (e) {
        if (hasCls(t$(e), 'resize')) {
            $resize = closest$(e, 'td');
        } else {
            $prevPanel = $panel() || $prevPanel;
            let section = closest$(e, 'section');
            section && setActive(section);
            let column = closest$(e, '.column');
            if (column && (!e.altKey && !e.metaKey && !e.ctrlKey)) {
                togCls('active', '.column', column);
            }
        }
    });

    document.addEventListener('mousemove', function (e) {
        if (!$resize) return;
        $resize.width = e.clientX;
    })

    document.addEventListener('mouseup', () => $resize = null);

    document.addEventListener('click', function (e) {
        // @formatter:off
        switch (t$(e).classList[0]) {
            case 'new': menuNew(); return;
            case 'log': menuLog(); return;
            case 'ls': menuLs(); return;
            case 'reset': menuReset(); return;
            case 'save': menuSave(); return;
            case 'ref': menuRef(); return;
            case 'mv': menuMv(); return;
            case 'del': menuDel(); return;
            case 'settings': menuSettings(); return;
            case 'export': menuExport(); return;
            case 'close': paneClose(e); return;
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