"use strict";

const $ = (sel, root = document) => root.querySelector(sel);
const $$ = (sel, root = document) => [...root.querySelectorAll(sel)];

let ME = { role: "admin", auth_enabled: false };

// ---------- API helper ----------
async function api(method, url, body) {
  const opts = { method, headers: {} };
  if (body !== undefined) {
    opts.headers["Content-Type"] = "application/json";
    opts.body = JSON.stringify(body);
  }
  const res = await fetch(url, opts);
  if (res.status === 401) { location.href = "/login"; throw new Error("auth"); }
  const data = res.headers.get("content-type")?.includes("json")
    ? await res.json() : null;
  if (!res.ok) throw new Error(data?.detail || `Error ${res.status}`);
  return data;
}

// ---------- Toast ----------
let toastTimer;
function toast(msg, kind = "ok") {
  const el = $("#toast");
  el.textContent = msg;
  el.className = `toast show ${kind}`;
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => { el.className = "toast hidden"; }, 3400);
}

// ---------- utils ----------
function escapeHtml(str) {
  return String(str ?? "").replace(/[&<>"']/g, c =>
    ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
}
function fmtDate(iso) {
  if (!iso) return t("feeds.never");
  return new Date(iso).toLocaleString(localeTag(),
    { day: "2-digit", month: "short", hour: "2-digit", minute: "2-digit" });
}

// Localize a status code emitted by the backend (e.g. "sent:3:1").
function formatStatus(code) {
  if (!code) return t("status.dash");
  const i = code.indexOf(":");
  const head = i === -1 ? code : code.slice(0, i);
  const rest = i === -1 ? "" : code.slice(i + 1);
  switch (head) {
    case "init": return t("status.init", { n: rest });
    case "sent": {
      const [n, s] = rest.split(":");
      return s ? t("status.sentSkip", { n, s }) : t("status.sent", { n });
    }
    case "filtered": return t("status.filtered", { s: rest });
    case "nochange": return t("status.nochange");
    case "parse_error": return t("status.parseError", { msg: rest });
    case "send_error": return t("status.sendError", { msg: rest });
    default: return code;
  }
}
function isErrorStatus(code) {
  return /^(parse_error|send_error)/.test(code || "");
}

// ---------- Stats + chart ----------
async function loadStats() {
  try {
    const s = await api("GET", "/api/stats");
    $("#stats").innerHTML = `
      <div class="stat"><b>${s.feeds_total}</b><span>${t("stats.feeds")}</span></div>
      <div class="stat"><b>${s.feeds_enabled}</b><span>${t("stats.enabled")}</span></div>
      <div class="stat ${s.feeds_failing ? "warn" : ""}"><b>${s.feeds_failing}</b><span>${t("stats.failing")}</span></div>
      <div class="stat"><b>${s.notifications_sent}</b><span>${t("stats.sent")}</span></div>
      <div class="stat ${s.notifications_failed ? "warn" : ""}"><b>${s.notifications_failed}</b><span>${t("stats.failed")}</span></div>`;
  } catch (_) {}
}

async function loadActivity() {
  let data;
  try { data = await api("GET", "/api/stats/activity?days=14"); } catch { return; }
  const total = data.reduce((a, d) => a + d.sent + d.failed, 0);
  const wrap = $("#chart-wrap");
  if (!total) { wrap.classList.add("hidden"); return; }
  wrap.classList.remove("hidden");

  const max = Math.max(1, ...data.map(d => d.sent + d.failed));
  const W = 100, H = 38, n = data.length, gap = 1.2;
  const bw = (W - gap * (n - 1)) / n;
  let bars = "";
  data.forEach((d, i) => {
    const x = i * (bw + gap);
    const sentH = (d.sent / max) * H;
    const failH = (d.failed / max) * H;
    const day = new Date(d.date + "T00:00").toLocaleDateString(localeTag(), { day: "2-digit", month: "short" });
    const title = `${day}: ${t("chart.sent")} ${d.sent}, ${t("chart.failed")} ${d.failed}`;
    bars += `<g><title>${escapeHtml(title)}</title>`;
    bars += `<rect class="bar-sent" x="${x.toFixed(2)}" y="${(H - sentH).toFixed(2)}" width="${bw.toFixed(2)}" height="${sentH.toFixed(2)}" rx="0.4"/>`;
    if (failH > 0)
      bars += `<rect class="bar-fail" x="${x.toFixed(2)}" y="${(H - sentH - failH).toFixed(2)}" width="${bw.toFixed(2)}" height="${failH.toFixed(2)}" rx="0.4"/>`;
    bars += `</g>`;
  });
  $("#chart").innerHTML =
    `<svg viewBox="0 0 ${W} ${H}" preserveAspectRatio="none" class="chart-svg">${bars}</svg>`;
}

// ---------- Feeds ----------
function feedCard(f) {
  const el = document.createElement("div");
  el.className = "feed-card" + (f.enabled ? "" : " disabled");
  const chips = [];
  chips.push(`<span class="chip topic">📨 ${escapeHtml(f.ntfy_topic || t("feeds.noTopic"))}</span>`);
  if (f.ntfy_server) chips.push(`<span class="chip">🖥️ ${escapeHtml(f.ntfy_server)}</span>`);
  if (f.ntfy_token || f.ntfy_username) chips.push(`<span class="chip">🔐 auth</span>`);
  chips.push(`<span class="chip">⚡ P${f.priority}</span>`);
  if (f.interval) chips.push(`<span class="chip">⏱ ${f.interval}m</span>`);
  if (f.to_telegram) chips.push(`<span class="chip tg">✈️ TG</span>`);
  if (f.to_webhook) chips.push(`<span class="chip">🔗 hook</span>`);
  if (f.filter_include || f.filter_exclude) chips.push(`<span class="chip">🧩</span>`);
  if (f.tags) chips.push(`<span class="chip">🏷️ ${escapeHtml(f.tags)}</span>`);

  const admin = ME.role === "admin";
  el.innerHTML = `
    <div class="feed-top">
      <span class="dot ${f.enabled ? "on" : "off"}"></span>
      <div style="min-width:0;flex:1">
        <div class="feed-title">${escapeHtml(f.title || f.url)}</div>
        <div class="feed-url">${escapeHtml(f.url)}</div>
        <div class="feed-meta">${chips.join("")}</div>
      </div>
      <div class="feed-actions">
        <button class="btn ghost small" data-act="check">↻</button>
        ${admin ? `<button class="btn ghost small" data-act="edit">✎</button>
        <button class="btn danger small" data-act="del">🗑</button>` : ""}
      </div>
    </div>
    <div class="feed-status">
      <span class="${isErrorStatus(f.last_status) ? "err" : (f.last_status.startsWith("sent") ? "ok" : "")}">${escapeHtml(formatStatus(f.last_status))}</span>
      &nbsp;·&nbsp; ${fmtDate(f.last_checked)}
    </div>`;

  $('[data-act="check"]', el).onclick = (e) => checkFeed(f, e.currentTarget);
  if (admin) {
    $('[data-act="edit"]', el).onclick = () => openModal(f);
    $('[data-act="del"]', el).onclick = () => deleteFeed(f);
  }
  return el;
}

async function loadFeeds() {
  const feeds = await api("GET", "/api/feeds");
  const list = $("#feeds-list");
  list.innerHTML = "";
  $("#feeds-empty").classList.toggle("hidden", feeds.length > 0);
  feeds.forEach(f => list.appendChild(feedCard(f)));
  loadStats();
  loadActivity();
}

async function deleteFeed(f) {
  if (!confirm(t("confirm.deleteFeed", { name: f.title || f.url }))) return;
  await api("DELETE", `/api/feeds/${f.id}`);
  toast(t("toast.feedDeleted"));
  loadFeeds();
}

async function checkFeed(f, btn) {
  const old = btn.textContent;
  btn.textContent = "…"; btn.disabled = true;
  try {
    const r = await api("POST", `/api/feeds/${f.id}/check`);
    toast(formatStatus(r.status), isErrorStatus(r.status) ? "err" : "ok");
    loadFeeds();
  } catch (e) { toast(e.message, "err"); }
  finally { btn.textContent = old; btn.disabled = false; }
}

// ---------- Feed modal ----------
const modal = $("#modal");
const feedForm = $("#feed-form");

function openModal(feed) {
  feedForm.reset();
  $("#preview-area").innerHTML = "";
  $("#modal-title").textContent = feed ? t("modal.editFeed") : t("modal.addFeed");
  feedForm.id.value = feed?.id || "";
  const f = feed || { attach_image: true, enabled: true, priority: 3, interval: 0 };
  for (const el of feedForm.elements) {
    if (!el.name || el.name === "id") continue;
    if (el.type === "checkbox") el.checked = !!f[el.name];
    else if (f[el.name] !== undefined) el.value = f[el.name];
  }
  modal.classList.remove("hidden");
}
function closeModal() { modal.classList.add("hidden"); }

$("#add-feed").onclick = () => openModal(null);
$("#modal-close").onclick = closeModal;
$("#modal-cancel").onclick = closeModal;
modal.addEventListener("click", e => { if (e.target === modal) closeModal(); });

$("#preview-btn").onclick = async () => {
  const url = feedForm.url.value.trim();
  if (!url) { toast(t("toast.needUrl"), "err"); return; }
  const area = $("#preview-area");
  area.innerHTML = `<div class="muted">${t("feed.previewLoading")}</div>`;
  try {
    const p = await api("POST", "/api/preview", {
      url,
      filter_include: feedForm.filter_include.value.trim(),
      filter_exclude: feedForm.filter_exclude.value.trim(),
    });
    const img = p.image ? `<img src="${escapeHtml(p.image)}" alt="" loading="lazy">` : "";
    area.innerHTML = `
      <div class="ntfy-preview">
        <div class="np-head">📡 ${escapeHtml(p.source || feedForm.title.value || "")}</div>
        <div class="np-title">${escapeHtml(p.title)}</div>
        <div class="np-body">${escapeHtml(p.body || "")}</div>
        ${img}
      </div>`;
  } catch (err) {
    area.innerHTML = `<div class="alert error">${escapeHtml(err.message)}</div>`;
  }
};

feedForm.addEventListener("submit", async e => {
  e.preventDefault();
  const payload = {
    url: feedForm.url.value.trim(),
    title: feedForm.title.value.trim(),
    ntfy_server: feedForm.ntfy_server.value.trim(),
    ntfy_topic: feedForm.ntfy_topic.value.trim(),
    ntfy_token: feedForm.ntfy_token.value.trim(),
    ntfy_username: feedForm.ntfy_username.value.trim(),
    ntfy_password: feedForm.ntfy_password.value,
    priority: parseInt(feedForm.priority.value, 10),
    interval: parseInt(feedForm.interval.value, 10) || 0,
    tags: feedForm.tags.value.trim(),
    filter_include: feedForm.filter_include.value.trim(),
    filter_exclude: feedForm.filter_exclude.value.trim(),
    attach_image: feedForm.attach_image.checked,
    to_telegram: feedForm.to_telegram.checked,
    to_webhook: feedForm.to_webhook.checked,
    enabled: feedForm.enabled.checked,
  };
  const id = feedForm.id.value;
  try {
    if (id) await api("PUT", `/api/feeds/${id}`, payload);
    else await api("POST", "/api/feeds", payload);
    toast(id ? t("toast.feedUpdated") : t("toast.feedAdded"));
    closeModal();
    loadFeeds();
  } catch (err) { toast(err.message, "err"); }
});

$("#check-all").onclick = async (e) => {
  const btn = e.currentTarget;
  btn.disabled = true;
  const feeds = await api("GET", "/api/feeds");
  for (const f of feeds.filter(x => x.enabled)) {
    try { await api("POST", `/api/feeds/${f.id}/check`); } catch (_) {}
  }
  btn.disabled = false;
  toast(t("toast.checkDone"));
  loadFeeds();
};

// ---------- OPML ----------
$("#export-btn").onclick = () => { location.href = "/api/feeds/export"; };
$("#import-btn").onclick = () => $("#opml-file").click();
$("#opml-file").onchange = async (e) => {
  const file = e.target.files[0];
  if (!file) return;
  const fd = new FormData();
  fd.append("file", file);
  try {
    const res = await fetch("/api/feeds/import", { method: "POST", body: fd });
    const data = await res.json();
    if (!res.ok) throw new Error(data.detail || "Error");
    toast(t("toast.imported", { added: data.added, total: data.total }));
    loadFeeds();
  } catch (err) { toast(err.message, "err"); }
  finally { e.target.value = ""; }
};

// ---------- History ----------
let historyTimer;
async function loadHistory() {
  const q = encodeURIComponent($("#history-search").value.trim());
  const onlyErr = $("#history-errors").checked;
  const notes = await api("GET", `/api/history?limit=200&q=${q}&only_errors=${onlyErr}`);
  const list = $("#history-list");
  list.innerHTML = "";
  $("#history-empty").classList.toggle("hidden", notes.length > 0);
  notes.forEach(n => {
    const el = document.createElement("div");
    el.className = "history-row " + (n.ok ? "ok" : "err");
    const channels = n.channels
      ? n.channels.split(",").map(c => `<span class="chip">${escapeHtml(c)}</span>`).join("")
      : "";
    el.innerHTML = `
      <div class="history-icon">${n.ok ? "✅" : "⚠️"}</div>
      <div class="history-main">
        <div class="history-title">${n.link
          ? `<a href="${escapeHtml(n.link)}" target="_blank" rel="noopener">${escapeHtml(n.title)}</a>`
          : escapeHtml(n.title)}</div>
        <div class="history-sub">
          <span class="muted">${escapeHtml(n.feed_title || "")}</span> ${channels}
          ${n.detail ? `<span class="err">${escapeHtml(n.detail)}</span>` : ""}
        </div>
      </div>
      <div class="history-time muted">${fmtDate(n.created_at)}</div>`;
    list.appendChild(el);
  });
}
function debouncedHistory() {
  clearTimeout(historyTimer);
  historyTimer = setTimeout(() => loadHistory().catch(e => toast(e.message, "err")), 250);
}
$("#history-search").oninput = debouncedHistory;
$("#history-errors").onchange = debouncedHistory;
$("#history-refresh").onclick = () => loadHistory().catch(e => toast(e.message, "err"));
$("#history-clear").onclick = async () => {
  if (!confirm(t("confirm.clearHistory"))) return;
  await api("DELETE", "/api/history");
  toast(t("toast.historyCleared"));
  loadHistory();
};

// ---------- Users ----------
const userModal = $("#user-modal");
const userForm = $("#user-form");

async function loadUsers() {
  const users = await api("GET", "/api/users");
  const list = $("#users-list");
  list.innerHTML = "";
  users.forEach(u => {
    const el = document.createElement("div");
    el.className = "feed-card";
    el.innerHTML = `
      <div class="feed-top">
        <span class="dot on"></span>
        <div style="flex:1">
          <div class="feed-title">${escapeHtml(u.username)}</div>
          <div class="feed-meta"><span class="chip ${u.role === "admin" ? "topic" : ""}">
            ${u.role === "admin" ? t("users.admin") : t("users.viewer")}</span></div>
        </div>
        <div class="feed-actions">
          <button class="btn ghost small" data-act="edit">✎</button>
          <button class="btn danger small" data-act="del">🗑</button>
        </div>
      </div>`;
    $('[data-act="edit"]', el).onclick = () => openUserModal(u);
    $('[data-act="del"]', el).onclick = async () => {
      if (!confirm(t("confirm.deleteUser", { name: u.username }))) return;
      try { await api("DELETE", `/api/users/${u.id}`); toast(t("toast.deleted")); loadUsers(); }
      catch (e) { toast(e.message, "err"); }
    };
    list.appendChild(el);
  });
}

function openUserModal(user) {
  userForm.reset();
  $("#user-modal-title").textContent = user ? t("user.editTitle") : t("user.addTitle");
  $("#pw-hint").textContent = user ? t("user.pwKeep") : t("user.pwReq");
  userForm.id.value = user?.id || "";
  userForm.username.value = user?.username || "";
  userForm.role.value = user?.role || "admin";
  userModal.classList.remove("hidden");
}
function closeUserModal() { userModal.classList.add("hidden"); }
$("#add-user").onclick = () => openUserModal(null);
$("#user-modal-close").onclick = closeUserModal;
$("#user-modal-cancel").onclick = closeUserModal;
userModal.addEventListener("click", e => { if (e.target === userModal) closeUserModal(); });

userForm.addEventListener("submit", async e => {
  e.preventDefault();
  const payload = {
    username: userForm.username.value.trim(),
    password: userForm.password.value,
    role: userForm.role.value,
  };
  const id = userForm.id.value;
  try {
    if (id) await api("PUT", `/api/users/${id}`, payload);
    else await api("POST", "/api/users", payload);
    toast(t("toast.saved"));
    closeUserModal();
    loadUsers();
  } catch (err) { toast(err.message, "err"); }
});

// ---------- Settings ----------
const sForm = $("#settings-form");

async function loadSettings() {
  const s = await api("GET", "/api/settings");
  for (const el of sForm.elements) {
    if (!el.name) continue;
    if (el.type === "checkbox") el.checked = !!s[el.name];
    else if (s[el.name] !== undefined) el.value = s[el.name];
  }
}

sForm.addEventListener("submit", async e => {
  e.preventDefault();
  const payload = {
    default_ntfy_server: sForm.default_ntfy_server.value.trim(),
    default_ntfy_token: sForm.default_ntfy_token.value.trim(),
    default_ntfy_username: sForm.default_ntfy_username.value.trim(),
    default_ntfy_password: sForm.default_ntfy_password.value,
    check_interval: parseInt(sForm.check_interval.value, 10),
    auth_enabled: sForm.auth_enabled.checked,
    telegram_enabled: sForm.telegram_enabled.checked,
    telegram_token: sForm.telegram_token.value.trim(),
    telegram_chat_id: sForm.telegram_chat_id.value.trim(),
    webhook_enabled: sForm.webhook_enabled.checked,
    webhook_url: sForm.webhook_url.value.trim(),
    alerts_enabled: sForm.alerts_enabled.checked,
    alert_topic: sForm.alert_topic.value.trim(),
    alert_threshold: parseInt(sForm.alert_threshold.value, 10) || 3,
  };
  try {
    await api("PUT", "/api/settings", payload);
    toast(t("toast.settingsSaved"));
  } catch (err) { toast(err.message, "err"); }
});

$("#test-btn").onclick = async () => {
  const topic = $("#test-topic").value.trim();
  if (!topic) { toast(t("toast.needTestTopic"), "err"); return; }
  try {
    const r = await api("POST", "/api/test", {
      server: sForm.default_ntfy_server.value.trim(),
      topic,
      token: sForm.default_ntfy_token.value.trim(),
      username: sForm.default_ntfy_username.value.trim(),
      password: sForm.default_ntfy_password.value,
    });
    toast(t("toast.sentTo", { dest: r.sent_to }));
  } catch (err) { toast(err.message, "err"); }
};

// ---------- Tabs ----------
$$(".tab").forEach(tab => tab.addEventListener("click", () => {
  $$(".tab").forEach(t => t.classList.remove("active"));
  $$(".tab-panel").forEach(p => p.classList.remove("active"));
  tab.classList.add("active");
  $(`#tab-${tab.dataset.tab}`).classList.add("active");
  if (tab.dataset.tab === "history") loadHistory().catch(() => {});
  if (tab.dataset.tab === "users") loadUsers().catch(() => {});
}));

// ---------- Theme + language ----------
$("#theme-btn").onclick = () => setTheme(getTheme() === "dark" ? "light" : "dark");

const langSelect = $("#lang-select");
langSelect.value = getLang();
langSelect.onchange = () => {
  setLang(langSelect.value);
  applyI18n();
  renderWhoami();
  // Re-render dynamic content in the new language.
  loadFeeds().catch(() => {});
  if ($("#tab-history").classList.contains("active")) loadHistory().catch(() => {});
  if ($("#tab-users").classList.contains("active")) loadUsers().catch(() => {});
};

function renderWhoami() {
  if (ME.auth_enabled) {
    $("#whoami").textContent = `${ME.username} · ${ME.role === "admin" ? t("role.admin") : t("role.viewer")}`;
  }
}

// ---------- init ----------
async function init() {
  applyI18n();
  try { ME = await api("GET", "/api/me"); } catch (_) {}
  if (ME.role !== "admin") $$(".admin-only").forEach(el => el.classList.add("hidden"));
  if (ME.auth_enabled) { $("#logout-btn").style.display = ""; renderWhoami(); }
  loadFeeds().catch(e => toast(e.message, "err"));
  if (ME.role === "admin") loadSettings().catch(e => toast(e.message, "err"));
}
init();