import { Editor } from "https://esm.sh/@tiptap/core@2.11.5";
import StarterKit from "https://esm.sh/@tiptap/starter-kit@2.11.5";
import Link from "https://esm.sh/@tiptap/extension-link@2.11.5";
import Image from "https://esm.sh/@tiptap/extension-image@2.11.5";

const root = document.getElementById("root");
const turndownService = new TurndownService({ headingStyle: "atx", codeBlockStyle: "fenced" });
marked.setOptions({ gfm: true, breaks: false });

const state = { user: null, local: true, authed: true, editor: null, noteId: null, view: "home", space: null, userNames: null, commonSpace: "common", isCommon: false };

const THEMES = [
  { id: "light", label: "Light", dark: false, dots: ["#f5f7fb", "#ffffff", "#3b82f6", "#8b5cf6"] },
  { id: "summer", label: "Summer", dark: false, dots: ["#fff8f0", "#fff0e0", "#f08040", "#14b8a6"] },
  { id: "max-summer", label: "Max Summer", dark: false, dots: ["#fffdf5", "#fff9e8", "#e53935", "#f59e0b"] },
  { id: "autumn", label: "Autumn", dark: false, dots: ["#f4f1ec", "#eae5de", "#d59b6a", "#7a9e6e"] },
  { id: "urban-slate", label: "Urban Slate", dark: false, dots: ["#eef0f3", "#ffffff", "#4a6a8a", "#c68a3c"] },
  { id: "frozen-mist", label: "Frozen Mist", dark: false, dots: ["#eef0f2", "#fcfcfd", "#c96f3a", "#4a8a96"] },
  { id: "yacht", label: "Yacht", dark: false, dots: ["#e9edf2", "#ffffff", "#33517a", "#b06a3c"] },
  { id: "copper", label: "Copper", dark: false, dots: ["#f3ede6", "#fdfaf5", "#b5653b", "#3b9a9c"] },
  { id: "marina", label: "Marina", dark: false, dots: ["#eaf0f4", "#ffffff", "#1f4e6e", "#4a97a6"] },
  { id: "neptune", label: "Neptune", dark: false, dots: ["#e7f1f4", "#ffffff", "#2f7fa0", "#d98a4a"] },
  { id: "sapphire", label: "Sapphire", dark: false, dots: ["#eef0f6", "#ffffff", "#5a73a6", "#c06a52"] },
  { id: "tropical", label: "Tropical", dark: false, dots: ["#f2efe6", "#fdfaf2", "#e76f51", "#32a09c"] },
  { id: "gossamer", label: "Gossamer", dark: false, dots: ["#eceef1", "#ffffff", "#3aa6a0", "#d0783c"] },
  { id: "dark", label: "Dark", dark: true, dots: ["#1a1b1e", "#26272b", "#7dd3fc", "#f59e0b"] },
  { id: "dracula", label: "Dracula", dark: true, dots: ["#0c0c1e", "#12122a", "#7c6af7", "#ff79c6"] },
  { id: "nord", label: "Nord", dark: true, dots: ["#2e3440", "#3b4252", "#88c0d0", "#d08770"] },
  { id: "tokyo-night", label: "Tokyo Night", dark: true, dots: ["#1a1b26", "#1f2335", "#7aa2f7", "#e0af68"] },
  { id: "catppuccin", label: "Catppuccin", dark: true, dots: ["#1e1e2e", "#26263a", "#cba6f7", "#94e2d5"] },
  { id: "one-dark", label: "One Dark", dark: true, dots: ["#21252b", "#282c34", "#61afef", "#98c379"] },
  { id: "sunset", label: "Sunset", dark: true, dots: ["#1c1018", "#251420", "#f472b6", "#fb923c"] },
];
const THEME_CONFIG_KEY = "snotes-theme-config";
const PREVIEW_KEY = "snotes-preview";
const themeMQ = window.matchMedia("(prefers-color-scheme: dark)");

function findTheme(id) { return THEMES.find((t) => t.id === id); }

function loadThemeConfig() {
  let cfg = {};
  try { cfg = JSON.parse(localStorage.getItem(THEME_CONFIG_KEY)) || {}; } catch (e) {}
  cfg.mode = cfg.mode === "manual" ? "manual" : "auto";
  cfg.light = findTheme(cfg.light) ? cfg.light : "light";
  cfg.dark = findTheme(cfg.dark) ? cfg.dark : "dark";
  cfg.manual = findTheme(cfg.manual) ? cfg.manual : "dark";
  return cfg;
}
let themeConfig = loadThemeConfig();

function saveThemeConfig() { try { localStorage.setItem(THEME_CONFIG_KEY, JSON.stringify(themeConfig)); } catch (e) {} }

function activeThemeId() {
  return themeConfig.mode === "auto" ? (themeMQ.matches ? themeConfig.dark : themeConfig.light) : themeConfig.manual;
}

function applyTheme(labelEl, swatchEl) {
  const id = activeThemeId();
  document.documentElement.setAttribute("data-theme", id);
  const t = findTheme(id);
  const label = labelEl || document.querySelector(".theme-label");
  const swatch = swatchEl || document.querySelector(".theme-btn .theme-swatch");
  if (label) label.textContent = t ? t.label : "";
  if (swatch && t) swatch.innerHTML = t.dots.map((c) => `<span class="theme-dot" style="background:${c}"></span>`).join("");
}

function themeSelector() {
  const sel = el("div", { class: "theme-selector" });
  const swatchEl = el("span", { class: "theme-swatch" });
  const labelEl = el("span", { class: "theme-label" });
  const btn = el("button", { class: "theme-btn", title: "Change theme" }, [
    swatchEl,
    labelEl,
    el("span", { class: "chevron", html: "&#9662;" }),
  ]);
  const pop = el("div", { class: "theme-popover hidden" });
  sel.appendChild(btn); sel.appendChild(pop);

  function optionHtml(t) {
    return `<button type="button" class="theme-option ${themeConfig.mode === "manual" && t.id === themeConfig.manual ? "active" : ""}" data-theme="${t.id}">
      <span class="theme-swatch">${t.dots.map((c) => `<span class="theme-dot" style="background:${c}"></span>`).join("")}</span>
      <span>${t.label}</span>
    </button>`;
  }

  function render() {
    applyTheme(labelEl, swatchEl);
    pop.innerHTML = `
      <div class="theme-pop-header">Themes</div>
      <div class="mode-row">
        <button type="button" class="mode-btn ${themeConfig.mode === "auto" ? "active" : ""}" data-mode="auto">Auto</button>
        <button type="button" class="mode-btn ${themeConfig.mode === "manual" ? "active" : ""}" data-mode="manual">Manual</button>
      </div>
      <div class="auto-panel ${themeConfig.mode === "auto" ? "" : "hidden"}">
        <label class="auto-label">Light theme</label>
        <select data-role="light">${THEMES.filter((t) => !t.dark).map((t) => `<option value="${t.id}" ${t.id === themeConfig.light ? "selected" : ""}>${t.label}</option>`).join("")}</select>
        <label class="auto-label">Dark theme</label>
        <select data-role="dark">${THEMES.filter((t) => t.dark).map((t) => `<option value="${t.id}" ${t.id === themeConfig.dark ? "selected" : ""}>${t.label}</option>`).join("")}</select>
      </div>
      <div class="theme-grid ${themeConfig.mode === "manual" ? "" : "hidden"}">
        <div class="theme-section">Light</div>${THEMES.filter((t) => !t.dark).map(optionHtml).join("")}
        <div class="theme-section">Dark</div>${THEMES.filter((t) => t.dark).map(optionHtml).join("")}
      </div>`;
  }

  btn.addEventListener("click", (e) => { e.stopPropagation(); pop.classList.toggle("hidden"); });
  pop.addEventListener("click", (e) => {
    const modeBtn = e.target.closest(".mode-btn");
    if (modeBtn) { themeConfig.mode = modeBtn.dataset.mode; saveThemeConfig(); render(); return; }
    const opt = e.target.closest(".theme-option");
    if (opt) { themeConfig.mode = "manual"; themeConfig.manual = opt.dataset.theme; saveThemeConfig(); render(); pop.classList.add("hidden"); }
  });
  pop.addEventListener("change", (e) => {
    if (e.target.matches('select[data-role="light"]')) { themeConfig.light = e.target.value; saveThemeConfig(); render(); }
    else if (e.target.matches('select[data-role="dark"]')) { themeConfig.dark = e.target.value; saveThemeConfig(); render(); }
  });
  document.addEventListener("click", (e) => { if (!sel.contains(e.target)) pop.classList.add("hidden"); });

  render();
  return sel;
}

if (themeMQ.addEventListener) themeMQ.addEventListener("change", () => { if (themeConfig.mode === "auto") applyTheme(); });
else if (themeMQ.addListener) themeMQ.addListener(() => { if (themeConfig.mode === "auto") applyTheme(); });

function el(tag, attrs = {}, children = []) {
  const node = document.createElement(tag);
  for (const [k, v] of Object.entries(attrs)) {
    if (k === "class") node.className = v;
    else if (k === "text") node.textContent = v;
    else if (k === "html") node.innerHTML = v;
    else if (k.startsWith("on") && typeof v === "function") node.addEventListener(k.slice(2), v);
    else node.setAttribute(k, v);
  }
  for (const c of [].concat(children)) {
    if (c == null) continue;
    node.appendChild(typeof c === "string" ? document.createTextNode(c) : c);
  }
  return node;
}

async function api(method, path, body) {
  const opts = { method, headers: { "Content-Type": "application/json" } };
  if (body !== undefined) opts.body = JSON.stringify(body);
  const resp = await fetch(path, opts);
  if (resp.status === 401) { showLogin(); throw new Error("unauthorized"); }
  if (!resp.ok) {
    const err = await resp.json().catch(() => ({}));
    throw new Error(err.detail || resp.statusText);
  }
  return resp.json();
}

function escapeHtml(s) {
  return (s || "").replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
}

async function boot() {
  try {
    const me = await api("GET", "/api/me");
    state.user = me.user; state.local = me.local; state.authed = me.authed;
    state.commonSpace = me.common_space || "common";
  } catch { return; }
  if (!state.local && !state.authed) { showLogin(); return; }
  showHome();
}

function showLogin() {
  root.innerHTML = "";
  const form = el("form", { class: "login-card", onsubmit: async (e) => { e.preventDefault(); await doLogin(); } }, [
    el("img", { src: "/static/snotes-new.png", class: "login-logo" }),
    el("h1", { text: "snotes" }),
    el("p", { class: "muted", text: "Remote access — enter password" }),
    el("input", { type: "password", id: "pw", placeholder: "Password", autofocus: true }),
    el("button", { type: "submit", class: "btn primary", text: "Sign in" }),
    el("div", { id: "login-err", class: "error" }),
  ]);
  root.appendChild(form);
}

async function doLogin() {
  const pw = document.getElementById("pw").value;
  try {
    await api("POST", "/api/auth/login", { password: pw });
    location.reload();
  } catch (e) {
    document.getElementById("login-err").textContent = "Invalid password";
  }
}

function header() {
  const menu = el("div", { class: "topbar-right", id: "mobile-menu" }, [
    el("select", { id: "user-select", class: "user-select", onchange: onUserChange }),
    el("button", { class: "btn primary", text: "+ New note", onclick: () => openNote(null) }),
    el("button", { class: "btn ghost", text: "Help", onclick: showHelp }),
    el("button", { class: "btn ghost", text: "QUICKsnote", onclick: showTools }),
    el("button", { class: "btn ghost", text: "CLI", onclick: showCli }),
    themeSelector(),
  ]);
  const burger = el("button", { class: "menu-toggle", title: "Menu", "aria-label": "Menu", onclick: () => menu.classList.toggle("open") }, [
    el("span", {}), el("span", {}), el("span", {}),
  ]);
  return el("header", { class: "topbar" }, [
    el("div", { class: "brand", onclick: showHome, title: "Home", role: "button" }, [
      el("img", { src: "/static/snotes-logo.png", class: "brand-logo", alt: "snotes" }),
    ]),
    burger,
    el("input", { id: "search", class: "search", type: "search", placeholder: "Search notes…", oninput: debounce(onSearch, 250) }),
    menu,
  ]);
}

function showHelp() {
  state.view = "help";
  root.innerHTML = "";
  state.editor?.destroy(); state.editor = null;

  const back = backButton(showHome);
  const wrap = el("div", { class: "editor-wrap" }, [
    el("div", { class: "editor-topbar" }, [back]),
    el("div", { class: "help-card" }, [
      el("div", { class: "tools-head" }, [
        el("img", { src: "/static/snotes-logo.png", class: "tools-logo", alt: "snotes" }),
        el("h1", { text: "Help" }),
      ]),

      el("h2", { text: "Keyboard shortcuts" }),
      el("table", { class: "help-table" }, [
        el("tr", {}, [el("th", { text: "Shortcut" }), el("th", { text: "Action" })]),
        helpRow("n", "New note (from the home page)"),
        helpRow("Ctrl/Cmd + S", "Save the current note"),
        helpRow("Ctrl/Cmd + Shift + S", "Save and open a new note"),
      ]),

      el("h2", { text: "Tags" }),
      el("p", { html: 'Type <code>#tag</code> anywhere in your note to tag it. Tags are normalized to lowercase and shown in the sidebar, search, and note list.' }),

      el("h2", { text: "Lists" }),
      el("p", { html: 'Type <code>- </code> at the start of a line for a bullet list, or <code>1. </code> for a numbered list. You can also use the <b>• List</b> and <b>1. List</b> toolbar buttons.' }),

      el("h2", { text: "Editing" }),
      el("p", { html: 'Use the toolbar to format text with <b>bold</b>, <i>italic</i>, headings, quotes, code, and horizontal rules. The editor also accepts standard Markdown shortcuts as you type.' }),

      el("h2", { text: "Notes & sharing" }),
      el("p", { html: 'Notes are plain Markdown files. A note lives in a <i>space</i> (a user), chosen with the dropdown at the top of the editor. Tick the <b>common</b> checkbox to save it to the shared space everyone can see. Changing the space moves the note to that user.' }),
      el("p", { html: 'Use <b>Attach</b> to upload a file and insert a link to it. <b>History</b> shows every change, and <b>Delete</b> soft-deletes a note.' }),
    ]),
  ]);
  root.appendChild(wrap);
}

function helpRow(keys, action) {
  return el("tr", {}, [el("td", { html: "<code>" + keys + "</code>" }), el("td", { text: action })]);
}

function showCli() {
  state.view = "cli";
  root.innerHTML = "";
  state.editor?.destroy(); state.editor = null;

  const back = backButton(showHome);
  const installCmd = "curl -fsSL " + window.location.origin + "/" + state.user + "/cli | bash";
  const cmdEl = el("code", { class: "cli-install-cmd", text: installCmd });
  const copyBtn = el("button", {
    class: "btn", text: "Copy",
    onclick: () => { navigator.clipboard?.writeText(installCmd); copyBtn.textContent = "Copied!"; setTimeout(() => { copyBtn.textContent = "Copy"; }, 2000); },
  });

  const card = el("div", { class: "help-card" }, [
    el("div", { class: "tools-head" }, [
      el("img", { src: "/static/snotes-logo.png", class: "tools-logo", alt: "snotes CLI" }),
      el("h1", { text: "snotes CLI" }),
    ]),
    el("p", { html: "A terminal client for snotes: TUI browser, quick capture, and <b>templates</b>." }),
    el("p", { html: "Requires <a href=\"https://docs.astral.sh/uv/\" target=\"_blank\">uv</a>. Install or update for user <b>" + escapeHtml(state.user) + "</b> with:" }),
    el("div", { class: "tools-row cli-install-row" }, [cmdEl, copyBtn]),
    el("p", { class: "muted", text: "The script downloads the CLI to ~/.local/bin/snotes and saves this server's URL and your userspace to ~/.config/snotes/config.json." }),

    el("h2", { text: "Commands" }),
    el("table", { class: "help-table" }, [
      el("tr", {}, [el("th", { text: "Command" }), el("th", { text: "Action" })]),
      helpRow("snotes", "Open the TUI: recent notes, list, search (n = new, enter = edit, d = delete)"),
      helpRow("snotes recent [-n N]", "Print recent notes"),
      helpRow("snotes find <term>", "Open the TUI with a search for <term>"),
      helpRow("snotes new", "Create a note in $EDITOR"),
      helpRow("snotes <template> [date]", "Open/create a note from a template (today, yesterday, YYYY-MM-DD, +/-N)"),
      helpRow("snotes templates", "List available templates"),
      helpRow("snotes login", "Authenticate for remote (non-LAN) access"),
    ]),

    el("h2", { text: "Templates" }),
    el("p", { html: "Any note containing <code>$name</code> defines a template — e.g. put <code>$journal</code> in a note titled <code># Journal for %date%</code> and <code>snotes journal</code> opens today's journal (existing entries are reopened, not duplicated)." }),
    el("p", { html: "Template variables: <code>%date%</code>, <code>%time%</code>, <code>%datetime%</code>, <code>%user%</code>." }),
  ]);

  const wrap = el("div", { class: "editor-wrap" }, [
    el("div", { class: "editor-topbar" }, [back]),
    card,
  ]);
  root.appendChild(wrap);
}

function showTools() {
  state.view = "tools";
  root.innerHTML = "";
  state.editor?.destroy(); state.editor = null;

  const back = backButton(showHome);

  const extStatus = el("div", { class: "muted", text: "" });
  const installBtn = el("button", { class: "btn primary", text: "Install Browser Extension" });
  const qsStatus = el("span", { class: "muted", text: "" });
  const qsApply = el("button", { class: "btn", text: "Apply to Extension" });

  const card = el("div", { class: "help-card" }, [
    el("div", { class: "tools-head" }, [
      el("img", { src: "/static/snotes-logo.png", class: "tools-logo", alt: "QUICKsnote" }),
      el("h1", { text: "QUICKsnote" }),
    ]),
    el("p", { html: 'The <b>QUICKsnote</b> browser extension lets you jot a note from any page. It prefills the note with the text you\'ve selected, and a <b>Page</b> button inserts the current page\'s title and link.' }),

    el("h2", { text: "Firefox" }),
    el("div", { class: "tools-row" }, [installBtn, extStatus]),

    el("h2", { text: "Quick settings" }),
    el("p", { text: "Point the extension at this snotes server (" + window.location.origin + ")." }),
    el("div", { class: "tools-row" }, [qsApply, qsStatus]),

    el("h2", { text: "Manual install" }),
    el("p", { text: "Open about:debugging#/runtime/this-firefox → Load Temporary Add-on… → select browser-extension/manifest.json." }),

    el("h2", { text: "Using it" }),
    el("p", { html: 'Open the toolbar icon, pick a <b>user</b>, type, and <b>Save</b> — or just stop typing for 8s and it autosaves.' }),
  ]);

  const wrap = el("div", { class: "editor-wrap" }, [
    el("div", { class: "editor-topbar" }, [back]),
    card,
  ]);
  root.appendChild(wrap);

  // ── Extension detection (ping/pong) ──────────────────────────────────────
  const xpiUrl = "/static/snotes-capture-firefox.xpi";
  let detected = false;
  let pingCount = 0;
  let pingInterval = null;
  let slowInterval = null;

  function stopPing() {
    if (pingInterval) clearInterval(pingInterval), pingInterval = null;
    if (slowInterval) clearInterval(slowInterval), slowInterval = null;
  }

  function applySettings() {
    window.postMessage({ kind: "snotes-settings", serverUrl: window.location.origin }, "*");
  }

  function onDetected() {
    const wasDetected = detected;
    detected = true;
    stopPing();
    extStatus.textContent = "✓ Extension detected";
    installBtn.textContent = "Extension installed";
    if (!wasDetected) setTimeout(applySettings, 300);
  }

  function doPing() {
    window.postMessage({ kind: "snotes-ping" }, "*");
    pingCount++;
    if (pingCount >= 8) {
      if (pingInterval) clearInterval(pingInterval), pingInterval = null;
      if (!detected && !slowInterval) {
        extStatus.textContent = "Extension not detected";
        slowInterval = setInterval(() => window.postMessage({ kind: "snotes-ping" }, "*"), 2000);
      }
    }
  }

  installBtn.addEventListener("click", () => {
    if (detected) return;
    if (window.InstallTrigger) InstallTrigger.install({ "QUICKsnote": xpiUrl });
    else window.location.href = xpiUrl;
    extStatus.textContent = "Installing… check toolbar for prompt";
    stopPing();
    pingCount = 0;
    pingInterval = setInterval(doPing, 500);
  });

  qsApply.addEventListener("click", () => {
    applySettings();
    qsStatus.textContent = "Applying…";
    setTimeout(() => { if (qsStatus.textContent === "Applying…") qsStatus.textContent = "No response — is the extension installed?"; }, 5000);
  });

  window.addEventListener("message", (event) => {
    if (event.source !== window) return;
    const msg = event.data;
    if (msg && msg.kind === "snotes-pong") onDetected();
    if (msg && msg.kind === "snotes-settings-ack") {
      qsStatus.textContent = "✓ Applied";
      setTimeout(() => { if (qsStatus.textContent === "✓ Applied") qsStatus.textContent = ""; }, 3000);
    }
  });

  pingInterval = setInterval(doPing, 500);
  doPing();
}

async function showHome() {
  state.view = "home";
  root.innerHTML = "";
  state.editor?.destroy(); state.editor = null;
  const h = header();
  root.appendChild(h);

  const main = el("div", { class: "layout" }, [
    el("div", { class: "col-main", id: "search-results" }),
    el("aside", { class: "col-side", id: "sidebar" }),
  ]);
  root.appendChild(main);

  await populateUsers();
  await loadRecent();
  await loadTags();
  document.getElementById("search").focus();
}

async function populateUsers() {
  const users = await api("GET", "/api/users");
  const sel = document.getElementById("user-select");
  const names = users.map((u) => u.name);
  state.userNames = names;
  for (const n of names) {
    if (n === state.commonSpace) continue;
    sel.appendChild(el("option", { value: n, text: n }));
  }
  sel.value = state.user;
}

async function onUserChange(e) {
  await api("POST", "/api/users/select", { username: e.target.value });
  state.user = e.target.value;
  await loadRecent();
}

async function loadRecent() {
  const notes = await api("GET", "/api/notes/recent");
  const box = document.getElementById("search-results");
  box.innerHTML = "";
  box.appendChild(el("h2", { text: "Recent notes" }));
  box.appendChild(noteList(notes));
}

async function loadTags() {
  const tags = await api("GET", "/api/tags");
  const box = document.getElementById("sidebar");
  box.innerHTML = "";
  box.appendChild(el("h3", { text: "Most-used tags" }));
  const cloud = el("div", { class: "tag-cloud" });
  for (const t of tags) {
    cloud.appendChild(el("button", { class: "tag-chip", html: "#" + escapeHtml(t.name), onclick: () => searchFor("#" + t.name) }));
  }
  box.appendChild(cloud);
}

function noteList(notes) {
  if (!notes.length) return el("p", { class: "muted", text: "No notes yet." });
  const ul = el("ul", { class: "note-list" });
  for (const n of notes) {
    const tags = (n.tags || []).map((t) => `#${t}`).join(" ");
    const isCommon = n.username === state.commonSpace;
    const meta = el("div", { class: "note-meta" });
    if (isCommon) meta.appendChild(el("span", { class: "common-badge", text: "common" }));
    meta.appendChild(document.createTextNode(`${n.username} · edited ${relTime(n.updated_at)} · created ${fmtDate(n.created_at)}`));
    if (n.attachments) meta.appendChild(el("span", { class: "attach-count", text: n.attachments + " attachment" + (n.attachments === 1 ? "" : "s") }));
    let snippetHtml = n.snippet ? marked.parse(n.snippet) : "";
    if (n.image) snippetHtml = snippetHtml.replace(/<img[^>]*>/g, "").trim();
    const bodyEl = el("div", { class: "note-body" }, [
      el("div", { class: "note-title", text: n.title || "Untitled" }),
      meta,
      el("div", { class: "note-tags", text: tags }),
      snippetHtml ? el("div", { class: "note-snippet", html: snippetHtml }) : null,
    ]);
    ul.appendChild(el("li", { class: isCommon ? "note-item note-common" : "note-item", onclick: () => openNote(n.id) }, [
      n.image ? el("img", { class: "note-banner", src: n.image, alt: "", loading: "lazy" }) : null,
      bodyEl,
    ]));
  }
  return ul;
}

async function onSearch(e) {
  const q = e.target.value.trim();
  if (!q) { document.getElementById("search-results").innerHTML = ""; await loadRecent(); return; }
  const results = await api("GET", "/api/search?q=" + encodeURIComponent(q));
  const box = document.getElementById("search-results");
  box.innerHTML = "";
  box.appendChild(searchHeader(q));
  box.appendChild(noteList(results));
}

async function searchFor(q) {
  document.getElementById("search").value = q;
  const results = await api("GET", "/api/search?q=" + encodeURIComponent(q));
  const box = document.getElementById("search-results");
  box.innerHTML = "";
  box.appendChild(searchHeader(q));
  box.appendChild(noteList(results));
}

function searchHeader(q) {
  return el("div", { class: "results-head" }, [
    backButton(clearSearch),
    el("h2", { text: `Results for "${q}"` }),
  ]);
}

async function clearSearch() {
  document.getElementById("search").value = "";
  document.getElementById("search-results").innerHTML = "";
  await loadRecent();
}

function fmtDate(iso) {
  if (!iso) return "";
  const d = new Date(iso.replace(" ", "T") + "Z");
  if (isNaN(d)) return iso;
  return d.toLocaleDateString();
}

function relTime(iso) {
  if (!iso) return "";
  const d = new Date(iso.replace(" ", "T") + "Z");
  if (isNaN(d)) return iso;
  const diff = (Date.now() - d.getTime()) / 1000;
  if (diff < 60) return "just now";
  if (diff < 3600) return Math.round(diff / 60) + "m ago";
  if (diff < 86400) return Math.round(diff / 3600) + "h ago";
  return d.toLocaleDateString();
}

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

async function openNote(noteId) {
  state.view = "editor";
  state.noteId = noteId;
  let body = "", owner = null;
  if (noteId) {
    const note = await api("GET", "/api/notes/" + noteId);
    body = note.body;
    owner = note.username;
  }
  renderEditor(body, owner);
}

function renderEditor(body, owner) {
  root.innerHTML = "";
  state.editor?.destroy();

  const isNew = !state.noteId;
  const back = backButton(exitEditor);
  const del = state.noteId ? el("button", { class: "btn danger", text: "Delete", onclick: deleteNote }) : null;
  const hist = state.noteId ? el("button", { class: "btn ghost", text: "History", onclick: showHistory }) : null;

  const realUsers = (state.userNames || [state.user]).filter((n) => n !== state.commonSpace);
  const spaceSel = el("select", { id: "space-select", class: "user-select", onchange: (e) => { state.space = e.target.value; } });
  for (const n of realUsers) {
    spaceSel.appendChild(el("option", { value: n, text: n }));
  }
  state.isCommon = owner === state.commonSpace;
  state.space = owner && owner !== state.commonSpace ? owner : (state.user || realUsers[0]);
  spaceSel.value = state.space;

  const commonCb = el("input", { type: "checkbox", id: "common-check" });
  commonCb.checked = state.isCommon;
  commonCb.addEventListener("change", () => { state.isCommon = commonCb.checked; });
  const commonLabel = el("label", { class: "common-toggle", title: "Save to the shared common space" }, [
    commonCb, el("span", { text: "common" }),
  ]);

  const toolbar = el("div", { class: "toolbar" }, [
    toolbarBtn("B", "bold"), toolbarBtn("I", "italic"),
    sep(), toolbarBtn("H1", "heading1"), toolbarBtn("H2", "heading2"), toolbarBtn("H3", "heading3"),
    sep(), toolbarBtn("• List", "bulletList"), toolbarBtn("1. List", "orderedList"),
    sep(), toolbarBtn("Quote", "blockquote"), toolbarBtn("Code", "codeBlock"), toolbarBtn("`", "code"),
    sep(), toolbarBtn("—", "horizontalRule"),
  ]);
  const editorArea = el("div", { class: "editor" });
  const previewArea = el("div", { class: "preview" });
  const split = el("div", { class: "editor-split" }, [editorArea, previewArea]);
  let previewOn = true;
  try { previewOn = localStorage.getItem(PREVIEW_KEY) !== "off"; } catch (e) {}
  const previewBtn = el("button", { class: "btn ghost preview-toggle" + (previewOn ? " active" : ""), text: "Preview", title: "Toggle live preview", onclick: () => { split.classList.toggle("preview-hidden"); previewBtn.classList.toggle("active"); try { localStorage.setItem(PREVIEW_KEY, previewBtn.classList.contains("active") ? "on" : "off"); } catch (e) {} } });
  if (!previewOn) split.classList.add("preview-hidden");
  const status = el("div", { class: "status", text: "" });
  const hint = el("div", { class: "editor-hint" }, [
    el("p", { html: 'Tags: type <code>#tag</code> anywhere in your note to add a tag.' }),
    el("p", { html: 'Lists: type <code>- </code> for a bullet list or <code>1. </code> for a numbered list, or use the toolbar buttons.' }),
    el("p", { html: 'Shortcuts: <code>Ctrl/Cmd+S</code> save · <code>Ctrl/Cmd+Shift+S</code> save &amp; new note.' }),
  ]);

  const fileInput = el("input", { type: "file", style: "display:none" });
  fileInput.addEventListener("change", () => uploadAttachment(fileInput));
  const attach = el("button", { class: "btn", text: "Attach", onclick: () => fileInput.click() });

  const wrap = el("div", { class: "editor-wrap" }, [
    el("div", { class: "editor-topbar" }, [back, ...(isNew ? [] : [spaceSel]), el("div", { class: "spacer" }), attach, hist, del, commonLabel, previewBtn]),
    toolbar,
    split,
    hint,
    status,
  ]);
  wrap.appendChild(fileInput);
  root.appendChild(wrap);

  state.editor = new Editor({
    element: editorArea,
    extensions: [StarterKit, Link.configure({ openOnClick: false }), Image],
    content: marked.parse(body),
    autofocus: true,
  });

  function updatePreview() {
    const md = turndownService.turndown(state.editor.getHTML());
    previewArea.innerHTML = marked.parse(md);
    previewArea.querySelectorAll("a").forEach((a) => {
      a.target = "_blank";
      a.rel = "noopener noreferrer";
    });
  }
  state.editor.on("update", updatePreview);
  updatePreview();
}

function sep() { return el("span", { class: "sep" }); }

function backButton(onclick) {
  return el("button", { class: "back-btn", title: "Back", "aria-label": "Back", onclick }, [
    el("span", { class: "back-icon", html: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></svg>' }),
  ]);
}

function toolbarBtn(label, action) {
  return el("button", { class: "tool-btn", text: label, onclick: () => runToolbar(action) });
}

function runToolbar(action) {
  const ed = state.editor; if (!ed) return;
  const cmds = {
    bold: () => ed.chain().focus().toggleBold().run(),
    italic: () => ed.chain().focus().toggleItalic().run(),
    heading1: () => ed.chain().focus().toggleHeading({ level: 1 }).run(),
    heading2: () => ed.chain().focus().toggleHeading({ level: 2 }).run(),
    heading3: () => ed.chain().focus().toggleHeading({ level: 3 }).run(),
    bulletList: () => ed.chain().focus().toggleBulletList().run(),
    orderedList: () => ed.chain().focus().toggleOrderedList().run(),
    blockquote: () => ed.chain().focus().toggleBlockquote().run(),
    codeBlock: () => ed.chain().focus().toggleCodeBlock().run(),
    code: () => ed.chain().focus().toggleCode().run(),
    horizontalRule: () => ed.chain().focus().setHorizontalRule().run(),
  };
  cmds[action]?.();
}

async function persistNote() {
  const html = state.editor.getHTML();
  const body = turndownService.turndown(html);
  const username = state.isCommon ? state.commonSpace : state.space;
  const status = document.querySelector(".status");
  try {
    let note;
    if (state.noteId) {
      note = await api("PUT", "/api/notes/" + state.noteId, { body, username });
    } else {
      note = await api("POST", "/api/notes", { body, username });
      state.noteId = note.id;
    }
    state.editor.commands.setContent(marked.parse(note.body));
    status.textContent = "Saved · " + (note.tags || []).map((t) => "#" + t).join(" ") || "";
  } catch (e) { status.textContent = "Error: " + e.message; }
}

function editorIsEmpty() {
  return !state.editor || state.editor.getText().trim() === "";
}

async function exitEditor() {
  if (state.noteId || !editorIsEmpty()) {
    await persistNote();
  }
  showHome();
}

async function saveAndNewNote() {
  await persistNote();
  openNote(null);
}

async function deleteNote() {
  if (!confirm("Delete this note?")) return;
  await api("DELETE", "/api/notes/" + state.noteId);
  showHome();
}

async function uploadAttachment(input) {
  const file = input.files && input.files[0];
  if (!file) return;
  const fd = new FormData();
  fd.append("file", file);
  fd.append("username", state.isCommon ? state.commonSpace : state.space);
  const status = document.querySelector(".status");
  try {
    const resp = await fetch("/api/attachments", { method: "POST", body: fd });
    if (!resp.ok) {
      const err = await resp.json().catch(() => ({}));
      throw new Error(err.detail || resp.statusText);
    }
    const data = await resp.json();
    if (file.type.startsWith("image/")) {
      state.editor.chain().focus().insertContent({
        type: "image",
        attrs: { src: data.url, alt: data.name, title: data.name },
      }).run();
    } else {
      state.editor.chain().focus().insertContent({
        type: "text",
        text: data.name,
        marks: [{ type: "link", attrs: { href: data.url } }],
      }).run();
    }
    if (status) status.textContent = "Attached " + data.name;
  } catch (e) {
    if (status) status.textContent = "Error: " + e.message;
  }
  input.value = "";
}

async function showHistory() {
  const rows = await api("GET", "/api/notes/" + state.noteId + "/history");
  const overlay = el("div", { class: "overlay" }, [
    el("div", { class: "modal" }, [
      el("h3", { text: "History" }),
      el("ul", { class: "history-list" }, rows.map((r) =>
        el("li", { text: `${r.action} · ${r.username} · ${r.at} · ${r.ip || "?"} · ${r.ua || ""}` })
      )),
      el("button", { class: "btn", text: "Close", onclick: () => overlay.remove() }),
    ]),
  ]);
  overlay.addEventListener("click", (e) => { if (e.target === overlay) overlay.remove(); });
  root.appendChild(overlay);
}

document.addEventListener("keydown", (e) => {
  const mod = e.ctrlKey || e.metaKey;
  if (state.view === "home") {
    if (e.key === "n" && !mod) {
      const active = document.activeElement;
      if (active && (active.tagName === "INPUT" || active.tagName === "TEXTAREA" || active.isContentEditable)) return;
      e.preventDefault();
      openNote(null);
    }
  } else if (state.view === "editor") {
    if (mod && e.key.toLowerCase() === "s") {
      e.preventDefault();
      if (e.shiftKey) saveAndNewNote();
      else persistNote();
    }
  }
});

boot();