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";

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 };

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 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;
  } 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() {
  return el("header", { class: "topbar" }, [
    el("div", { class: "brand" }, [
      el("img", { src: "/static/snotes-logo.png", class: "brand-logo", alt: "snotes" }),
    ]),
    el("input", { id: "search", class: "search", type: "search", placeholder: "Search notes…", oninput: debounce(onSearch, 250) }),
    el("div", { class: "topbar-right" }, [
      el("select", { id: "user-select", class: "user-select", onchange: onUserChange }),
      el("button", { class: "btn primary", text: "+ New note", onclick: () => openNote(null) }),
      themeSelector(),
    ]),
  ]);
}

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) {
    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) => `#${t}`).join(" ");
    ul.appendChild(el("li", { class: "note-item", onclick: () => openNote(n.id) }, [
      el("div", { class: "note-title", text: n.title || "Untitled" }),
      el("div", { class: "note-meta", text: `${n.username} · ${relTime(n.updated_at)}` }),
      el("div", { class: "note-tags", text: tags }),
    ]));
  }
  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(el("h2", { text: `Results for "${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(el("h2", { text: `Results for "${q}"` }));
  box.appendChild(noteList(results));
}

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 back = el("button", { class: "btn ghost", text: "← Back", onclick: showHome });
  const save = el("button", { class: "btn primary", text: "Save", onclick: saveNote });
  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 spaceSel = el("select", { id: "space-select", class: "user-select", onchange: (e) => { state.space = e.target.value; } });
  for (const n of (state.userNames || [state.user])) {
    spaceSel.appendChild(el("option", { value: n, text: n }));
  }
  const initialSpace = owner || state.space || state.user;
  spaceSel.value = initialSpace;
  state.space = initialSpace;

  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 status = el("div", { class: "status", text: "" });

  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, spaceSel, el("div", { class: "spacer" }), attach, hist, del, save]),
    toolbar,
    editorArea,
    status,
  ]);
  wrap.appendChild(fileInput);
  root.appendChild(wrap);

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

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

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 saveNote() {
  const html = state.editor.getHTML();
  const body = turndownService.turndown(html);
  const status = document.querySelector(".status");
  try {
    let note;
    if (state.noteId) {
      note = await api("PUT", "/api/notes/" + state.noteId, { body, username: state.space });
    } else {
      note = await api("POST", "/api/notes", { body, username: state.space });
      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; }
}

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.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();
    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);
}

boot();