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

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-main.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-main.png", class: "brand-logo" }),
      el("span", { text: "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) }),
    ]),
  ]);
}

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).concat(["common"]);
  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 = "";
  if (noteId) {
    const note = await api("GET", "/api/notes/" + noteId);
    body = note.body;
  }
  renderEditor(body);
}

function renderEditor(body) {
  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 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: "" });

  root.appendChild(el("div", { class: "editor-wrap" }, [
    el("div", { class: "editor-topbar" }, [back, el("div", { class: "spacer" }), hist, del, save]),
    toolbar,
    editorArea,
    status,
  ]));

  state.editor = new Editor({
    element: editorArea,
    extensions: [StarterKit],
    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 {
    if (state.noteId) {
      const note = await api("PUT", "/api/notes/" + state.noteId, { body });
      status.textContent = "Saved · " + (note.tags || []).map((t) => "#" + t).join(" ") || "";
    } else {
      const note = await api("POST", "/api/notes", { body });
      state.noteId = note.id;
      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 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();