const BOOL_FIELDS = [
  "use_llm",
  "use_description_variation",
  "auto_fill_enabled",
];
const NUMBER_FIELDS = [
  "gitlab_board_id",
  "auto_fill_hour",
  "auto_fill_minute",
  "max_hours_per_day",
  "hour_step",
  "compbase_default_days",
];

const SECRET_INPUTS = new Set(["gitlab_token", "xai_api_key", "compbase_password"]);

function fillSettingsForm(data) {
  const form = document.getElementById("settingsForm");
  for (const el of form.querySelectorAll("[name]")) {
    const name = el.name;
    if (name === "dates_file_content") continue;
    if (BOOL_FIELDS.includes(name)) {
      el.checked = Boolean(data[name]);
      continue;
    }
    // Never put masked secrets back into password fields (looks like a real token)
    if (SECRET_INPUTS.has(name)) {
      el.value = "";
      el.placeholder = data[`${name}_set`]
        ? "已設定（重新貼上才會更新）"
        : "貼上 token";
      continue;
    }
    if (data[name] !== undefined && data[name] !== null) {
      el.value = data[name];
    }
  }
  if (data.pts_username) {
    document.getElementById("ptsUsername").value = data.pts_username;
  }
  if (data.teams_username) {
    document.getElementById("teamsUsername").value = data.teams_username;
  }
  document.getElementById("teamsEnabled").checked = Boolean(data.teams_calendar_enabled);

  const gitlabHint = document.getElementById("gitlabTokenHint");
  if (gitlabHint) {
    gitlabHint.textContent = data.gitlab_token_set
      ? "Token 已儲存。若無法使用請重新產生並貼上新的 Personal Access Token（權限至少 api）。"
      : "到 GitLab → Preferences → Access Tokens 建立，勾選 api。";
  }
}

function collectSettingsPayload(form) {
  const payload = {};
  for (const el of form.querySelectorAll("[name]")) {
    const name = el.name;
    if (name === "dates_file_content") continue;
    if (BOOL_FIELDS.includes(name)) {
      payload[name] = el.checked;
      continue;
    }
    if (NUMBER_FIELDS.includes(name)) {
      const num = el.value === "" ? null : Number(el.value);
      if (num !== null && !Number.isNaN(num)) payload[name] = num;
      continue;
    }
    const value = el.value.trim();
    if (name === "gitlab_milestone_title") {
      payload[name] = value;
      continue;
    }
    if (value !== "") payload[name] = value;
  }
  payload.teams_calendar_enabled = document.getElementById("teamsEnabled").checked;
  return payload;
}

function renderAuthStatus(data) {
  const ptsEl = document.getElementById("ptsAuthStatus");
  if (ptsEl) {
    ptsEl.textContent = data.has_pts_session ? "已連線" : "未連線";
    ptsEl.className = `badge ${data.has_pts_session ? "ok" : "warn"}`;
  }
  const teams = data.teams_calendar || data.graph_calendar || {};
  const teamsEl = document.getElementById("teamsAuthStatus");
  if (teamsEl) {
    if (!data.teams_calendar_enabled) {
      teamsEl.textContent = "未啟用";
      teamsEl.className = "badge";
    } else if (teams.connected) {
      teamsEl.textContent = teams.auth_mode === "graph_api" ? "Graph API" : "已連線";
      teamsEl.className = "badge ok";
    } else {
      teamsEl.textContent = "未連線";
      teamsEl.className = "badge warn";
    }
  }
}

async function refreshStatus() {
  try {
    const data = await api("/api/status");
    renderAuthStatus(data);
  } catch (err) {
    console.error(err);
  }
}

async function loadSettings() {
  const [settings, dates] = await Promise.all([
    api("/api/settings"),
    api("/api/dates-file"),
  ]);
  fillSettingsForm(settings);
  document.getElementById("datesFileContent").value = dates.content || "";
}

async function saveSettings(event) {
  event.preventDefault();
  const statusEl = document.getElementById("settingsStatus");
  statusEl.textContent = "儲存中…";
  statusEl.className = "settings-status";
  const form = document.getElementById("settingsForm");
  const payload = collectSettingsPayload(form);
  const datesContent = document.getElementById("datesFileContent").value;
  try {
    await api("/api/settings", {
      method: "PUT",
      body: JSON.stringify(payload),
    });
    await api("/api/dates-file", {
      method: "PUT",
      body: JSON.stringify({ content: datesContent }),
    });
    await loadSettings();
    await refreshStatus();
    statusEl.textContent = "已儲存";
    statusEl.className = "settings-status ok";
  } catch (err) {
    statusEl.textContent = err.message;
    statusEl.className = "settings-status err";
  }
}

async function ptsLogin() {
  const msg = document.getElementById("ptsLoginMsg");
  const username = document.getElementById("ptsUsername").value.trim();
  const password = document.getElementById("ptsPassword").value;
  msg.textContent = "登入中…";
  msg.className = "settings-status";
  try {
    const data = await api("/api/pts/login", {
      method: "POST",
      body: JSON.stringify({ username, password, remember: true }),
    });
    document.getElementById("ptsPassword").value = "";
    msg.textContent = data.message || "登入成功";
    msg.className = "settings-status ok";
    await refreshStatus();
  } catch (err) {
    msg.textContent = err.message;
    msg.className = "settings-status err";
  }
}

async function ptsLogout() {
  const msg = document.getElementById("ptsLoginMsg");
  try {
    await api("/api/pts/logout", { method: "POST" });
    msg.textContent = "已清除 session";
    msg.className = "settings-status";
    await refreshStatus();
  } catch (err) {
    msg.textContent = err.message;
    msg.className = "settings-status err";
  }
}

let _mfaPreviewTimer = null;
let _mfaMetaTimer = null;

function vncPageUrl(port) {
  const host = window.location.hostname || "localhost";
  const p = port || 6080;
  // autoconnect + scale to fit modal
  return `http://${host}:${p}/vnc.html?autoconnect=1&resize=scale&reconnect=1`;
}

function openTeamsMfaModal(view) {
  const modal = document.getElementById("teamsMfaModal");
  if (!modal) return;
  modal.classList.remove("hidden");
  const port = (view && view.vnc_port) || 6080;
  const interactive = !!(view && view.interactive);
  const link = document.getElementById("teamsVncLink");
  const frame = document.getElementById("teamsVncFrame");
  const url = vncPageUrl(port);
  if (link) {
    link.href = url;
    link.style.display = interactive ? "" : "none";
  }
  if (frame) {
    if (interactive) {
      frame.src = url;
      frame.style.display = "";
    } else {
      frame.removeAttribute("src");
      frame.style.display = "none";
    }
  }
  const hint = document.getElementById("teamsMfaHint");
  if (hint) {
    hint.innerHTML = interactive
      ? "帳密送出後，請在下方<strong>互動畫面</strong>完成驗證（可點數字、輸入驗證碼）。瀏覽器最多保持約 <strong>10 分鐘</strong>，完成前不會關掉。"
      : "請在跳出的 <strong>Chromium 視窗</strong>完成 MFA。右側會顯示即時截圖（若有）。";
  }
  const status = document.getElementById("teamsMfaStatus");
  if (status) {
    status.textContent = (view && view.message) || "登入中…";
    status.className = "settings-status";
  }
  startMfaPreviewPoll();
}

function closeTeamsMfaModal() {
  stopMfaPreviewPoll();
  const modal = document.getElementById("teamsMfaModal");
  if (modal) modal.classList.add("hidden");
  const frame = document.getElementById("teamsVncFrame");
  if (frame) {
    frame.removeAttribute("src");
  }
}

function startMfaPreviewPoll() {
  stopMfaPreviewPoll();
  const img = document.getElementById("teamsMfaShot");
  const meta = document.getElementById("teamsMfaShotMeta");
  const status = document.getElementById("teamsMfaStatus");
  const tick = () => {
    if (img) {
      img.src = `/api/teams/mfa-preview?t=${Date.now()}`;
    }
  };
  tick();
  _mfaPreviewTimer = setInterval(tick, 1500);
  _mfaMetaTimer = setInterval(async () => {
    try {
      const view = await api("/api/teams/browser-view");
      if (status && view.login_message) {
        status.textContent = view.login_message;
      }
      if (meta) {
        const parts = [];
        if (view.mfa_preview_label) parts.push(view.mfa_preview_label);
        if (view.mfa_page_url) parts.push(view.mfa_page_url.replace(/^https?:\/\//, "").slice(0, 48));
        meta.textContent = parts.join(" · ") || "更新中";
      }
    } catch {
      /* ignore */
    }
  }, 2000);
}

function stopMfaPreviewPoll() {
  if (_mfaPreviewTimer) {
    clearInterval(_mfaPreviewTimer);
    _mfaPreviewTimer = null;
  }
  if (_mfaMetaTimer) {
    clearInterval(_mfaMetaTimer);
    _mfaMetaTimer = null;
  }
}

async function teamsLogin() {
  const msg = document.getElementById("teamsLoginMsg");
  const username = document.getElementById("teamsUsername").value.trim();
  const password = document.getElementById("teamsPassword").value;
  if (!username || !password) {
    msg.textContent = "請輸入 Microsoft 帳號與密碼";
    msg.className = "settings-status err";
    return;
  }
  msg.textContent = "登入中…（請在 MFA 畫面完成驗證）";
  msg.className = "settings-status";
  document.getElementById("teamsEnabled").checked = true;

  let view = {};
  try {
    view = await api("/api/teams/browser-view");
  } catch {
    view = { interactive: false, vnc_port: 6080 };
  }
  openTeamsMfaModal(view);

  try {
    await api("/api/settings", {
      method: "PUT",
      body: JSON.stringify({ teams_calendar_enabled: true }),
    });
    const data = await api("/api/teams/login", {
      method: "POST",
      body: JSON.stringify({ username, password, remember: true, headless: false }),
    });
    document.getElementById("teamsPassword").value = "";
    msg.textContent = data.message || "登入成功";
    msg.className = "settings-status ok";
    const st = document.getElementById("teamsMfaStatus");
    if (st) {
      st.textContent = data.message || "登入成功";
      st.className = "settings-status ok";
    }
    await refreshStatus();
    setTimeout(closeTeamsMfaModal, 1500);
  } catch (err) {
    msg.textContent = err.message;
    msg.className = "settings-status err";
    const st = document.getElementById("teamsMfaStatus");
    if (st) {
      st.textContent = err.message;
      st.className = "settings-status err";
    }
  }
}

async function teamsLogout() {
  const msg = document.getElementById("teamsLoginMsg");
  try {
    await api("/api/teams/logout", { method: "POST" });
    msg.textContent = "已中斷";
    msg.className = "settings-status";
    await refreshStatus();
  } catch (err) {
    msg.textContent = err.message;
    msg.className = "settings-status err";
  }
}

function escapeHtml(text) {
  return String(text ?? "")
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;");
}

function initTeamsTestDates() {
  const today = new Date().toISOString().slice(0, 10);
  const startEl = document.getElementById("teamsTestStart");
  const endEl = document.getElementById("teamsTestEnd");
  if (startEl && !startEl.value) startEl.value = today;
  if (endEl && !endEl.value) endEl.value = today;
}

async function teamsShowStatus() {
  const msg = document.getElementById("teamsTestMsg");
  const debug = document.getElementById("teamsTestDebug");
  try {
    const data = await api("/api/teams/status");
    if (msg) {
      msg.textContent = data.connected
        ? `連線中（${data.auth_mode || "session"}）`
        : "未連線或 session 過期，請先登入 Teams";
      msg.className = `settings-status ${data.connected ? "ok" : "err"}`;
    }
    if (debug) debug.textContent = JSON.stringify(data, null, 2);
  } catch (err) {
    if (msg) {
      msg.textContent = err.message;
      msg.className = "settings-status err";
    }
  }
}

async function teamsTestMeetings() {
  const msg = document.getElementById("teamsTestMsg");
  const summary = document.getElementById("teamsTestSummary");
  const list = document.getElementById("teamsTestList");
  const debug = document.getElementById("teamsTestDebug");
  const start = document.getElementById("teamsTestStart")?.value;
  const end = document.getElementById("teamsTestEnd")?.value || start;
  const skip = document.getElementById("teamsTestSkipHolidays")?.checked !== false;

  if (!start) {
    if (msg) {
      msg.textContent = "請選開始日期";
      msg.className = "settings-status err";
    }
    return;
  }

  if (msg) {
    msg.textContent = "測試中…（可能開瀏覽器做 MFA）";
    msg.className = "settings-status";
  }
  if (list) list.innerHTML = "";
  if (summary) summary.innerHTML = "";
  if (debug) debug.textContent = "請求中…";

  try {
    const q = new URLSearchParams({
      start_date: start,
      end_date: end,
      skip_holidays: skip ? "true" : "false",
      debug: "true",
    });
    const data = await api(`/api/teams/meetings?${q.toString()}`);

    if (summary) {
      summary.innerHTML = [
        `<span class="pill"><span class="pill-label">會議</span><span class="pill-value">${data.total_count ?? 0}</span></span>`,
        `<span class="pill"><span class="pill-label">時數</span><span class="pill-value">${data.total_hours ?? 0}h</span></span>`,
        `<span class="pill"><span class="pill-label">天數</span><span class="pill-value">${data.workday_count ?? 0}</span></span>`,
        `<span class="pill"><span class="pill-label">連線</span><span class="pill-value">${data.connected ? "是" : "否"}</span></span>`,
      ].join("");
    }

    const days = (data.days || []).filter((d) => d.count > 0);
    if (list) {
      if (!days.length) {
        list.innerHTML = `<p class="hint">${escapeHtml(data.fetch_hint || data.error || "0 筆會議")}</p>`;
      } else {
        list.innerHTML = days
          .map((day) => {
            const rows = (day.meetings || [])
              .map(
                (m) =>
                  `<li class="plan-row"><span class="meeting-hours">${escapeHtml(String(m.hours))}h</span>` +
                  `<span class="meeting-time">${escapeHtml(m.time_label || "")}</span>` +
                  `<span class="meeting-subject">${escapeHtml(m.subject || "")}</span></li>`
              )
              .join("");
            return `<div class="plan-day"><div class="plan-day-head"><strong>${escapeHtml(day.date)}</strong>` +
              `<span class="muted-inline">${day.count} 場 · ${day.hours}h</span></div>` +
              `<ul class="meeting-items">${rows}</ul></div>`;
          })
          .join("");
      }
    }

    if (msg) {
      if (data.error) {
        msg.textContent = data.error;
        msg.className = "settings-status err";
      } else if ((data.total_count || 0) > 0) {
        msg.textContent = `成功：${data.total_count} 場會議 · ${data.total_hours}h`;
        msg.className = "settings-status ok";
      } else {
        msg.textContent = data.fetch_hint || "完成但 0 筆會議";
        msg.className = "settings-status err";
      }
    }
    if (debug) debug.textContent = JSON.stringify(data, null, 2);
  } catch (err) {
    if (msg) {
      msg.textContent = err.message;
      msg.className = "settings-status err";
    }
    if (debug) debug.textContent = err.message;
  }
}

document.getElementById("settingsForm").addEventListener("submit", saveSettings);
document.getElementById("ptsLoginBtn").addEventListener("click", ptsLogin);
document.getElementById("ptsLogoutBtn").addEventListener("click", ptsLogout);
document.getElementById("teamsLoginBtn").addEventListener("click", teamsLogin);
document.getElementById("teamsLogoutBtn").addEventListener("click", teamsLogout);
document.getElementById("teamsTestBtn")?.addEventListener("click", () => {
  teamsTestMeetings().catch(console.error);
});
document.getElementById("teamsStatusBtn")?.addEventListener("click", () => {
  teamsShowStatus().catch(console.error);
});
document.getElementById("teamsMfaClose")?.addEventListener("click", () => {
  // Only hide preview; login request keeps running until MFA done or timeout
  closeTeamsMfaModal();
});
document.getElementById("teamsMfaShot")?.addEventListener("error", () => {
  /* 404 until first snapshot — ignore */
});

initTeamsTestDates();
loadSettings().then(refreshStatus).catch(console.error);