"use strict";

// --- state -----------------------------------------------------------------
let CONFIG = null;
let messages = [];              // current folder's messages
const selected = new Set();     // selected localguids
let jobPollTimer = null;

// --- element refs ----------------------------------------------------------
const $ = (id) => document.getElementById(id);
const folderSelect = $("folder-select");
const limitInput = $("limit-input");
const msgBody = $("msg-body");
const selectAll = $("select-all");
const emptyNote = $("empty-note");
const statusBar = $("status-bar");
const moveBtn = $("move-btn");
const moveMenu = $("move-menu");
const overlay = $("overlay");

// --- init ------------------------------------------------------------------
async function init() {
  CONFIG = await fetchJSON("/api/config");
  for (const f of CONFIG.folders) {
    folderSelect.append(new Option(f, f));
  }
  folderSelect.value = CONFIG.default_folder;
  limitInput.value = CONFIG.default_limit;

  // Move dropdown targets
  moveMenu.innerHTML = "";
  for (const f of CONFIG.folders) {
    const item = document.createElement("button");
    item.className = "move-item";
    item.textContent = f;
    item.onclick = () => { hideMoveMenu(); runAction("move", f); };
    moveMenu.append(item);
  }

  wireEvents();
  await loadMessages();
  startJobPolling();
}

function wireEvents() {
  $("refresh-btn").onclick = loadMessages;
  folderSelect.onchange = () => { clearSelection(); loadMessages(); };
  limitInput.onchange = loadMessages;
  selectAll.onchange = () => toggleSelectAll(selectAll.checked);

  document.querySelectorAll(".btn.action[data-action]").forEach((btn) => {
    btn.onclick = () => runAction(btn.dataset.action);
  });

  moveBtn.onclick = (e) => {
    e.stopPropagation();
    moveMenu.classList.toggle("hidden");
  };
  document.addEventListener("click", hideMoveMenu);

  $("overlay-close").onclick = closeOverlay;
  overlay.onclick = (e) => { if (e.target === overlay) closeOverlay(); };
  $("ov-toggle").onclick = toggleBody;
}

// --- message list ----------------------------------------------------------
async function loadMessages() {
  const folder = folderSelect.value;
  const limit = limitInput.value || CONFIG.default_limit;
  msgBody.innerHTML = `<tr><td colspan="5" class="loading">Loading…</td></tr>`;
  try {
    const data = await fetchJSON(
      `/api/messages?folder=${encodeURIComponent(folder)}&limit=${encodeURIComponent(limit)}`
    );
    messages = data.messages;
    renderRows();
  } catch (err) {
    msgBody.innerHTML = `<tr><td colspan="5" class="error">${escapeHTML(err.message)}</td></tr>`;
  }
}

function renderRows() {
  clearSelection();
  msgBody.innerHTML = "";
  emptyNote.classList.toggle("hidden", messages.length > 0);

  for (const m of messages) {
    const tr = document.createElement("tr");
    tr.dataset.localguid = m.localguid;

    const check = document.createElement("input");
    check.type = "checkbox";
    check.onclick = (e) => e.stopPropagation();
    check.onchange = () => toggleRow(m.localguid, check.checked, tr);

    const tdCheck = document.createElement("td");
    tdCheck.className = "col-check";
    tdCheck.append(check);

    tr.append(tdCheck);
    tr.append(cell(formatDate(m.date), "col-date"));
    tr.append(cell(m.from || "", "col-from"));
    tr.append(cell((m.rcpts || []).join(", "), "col-rcpt"));
    tr.append(cell(m.subject || "(no subject)", "col-subj"));

    tr.onclick = () => openOverlay(m);
    msgBody.append(tr);
  }
  updateActionButtons();
}

function cell(text, cls) {
  const td = document.createElement("td");
  td.className = cls;
  td.textContent = text;
  td.title = text;
  return td;
}

// --- selection -------------------------------------------------------------
function toggleRow(localguid, on, tr) {
  if (on) selected.add(localguid); else selected.delete(localguid);
  tr.classList.toggle("selected", on);
  updateActionButtons();
}

function toggleSelectAll(on) {
  msgBody.querySelectorAll("tr").forEach((tr) => {
    const cb = tr.querySelector('input[type="checkbox"]');
    if (cb) { cb.checked = on; toggleRow(tr.dataset.localguid, on, tr); }
  });
}

function clearSelection() {
  selected.clear();
  selectAll.checked = false;
  updateActionButtons();
}

function updateActionButtons() {
  const has = selected.size > 0;
  document.querySelectorAll(".btn.action").forEach((b) => { b.disabled = !has; });
}

// --- actions ---------------------------------------------------------------
async function runAction(action, targetfolder) {
  const chosen = messages.filter((m) => selected.has(m.localguid));
  if (chosen.length === 0) return;
  if (action === "delete" &&
      !confirm(`Delete ${chosen.length} message(s)? They move to "${CONFIG.deleted_folder}".`)) {
    return;
  }

  const payload = {
    action,
    folder: folderSelect.value,
    messages: chosen.map((m) => ({ localguid: m.localguid, guid: m.guid })),
  };
  if (action === "move") payload.targetfolder = targetfolder;

  try {
    await fetchJSON("/api/actions", { method: "POST", body: JSON.stringify(payload) });
  } catch (err) {
    alert("Action failed to queue: " + err.message);
    return;
  }

  // Optimistic: remove acted-on rows immediately.
  const gone = new Set(chosen.map((m) => m.localguid));
  messages = messages.filter((m) => !gone.has(m.localguid));
  renderRows();
  pollJobs();
}

// --- overlay ---------------------------------------------------------------
async function openOverlay(m) {
  $("ov-subject").textContent = m.subject || "(no subject)";
  $("ov-meta").innerHTML = "";
  $("ov-text").textContent = "Loading…";
  $("ov-html").classList.add("hidden");
  $("ov-text").classList.remove("hidden");
  $("ov-toggle").classList.add("hidden");
  overlay.classList.remove("hidden");

  try {
    const data = await fetchJSON(`/api/message/${encodeURIComponent(m.guid)}`);
    renderOverlay(data);
  } catch (err) {
    $("ov-text").textContent = "Failed to load message: " + err.message;
  }
}

function renderOverlay(data) {
  const h = data.headers || {};
  const meta = [
    ["From", h.from], ["To", h.to], ["Cc", h.cc], ["Date", h.date],
  ].filter(([, v]) => v);
  $("ov-meta").innerHTML = meta
    .map(([k, v]) => `<div><span class="mk">${k}:</span> ${escapeHTML(v)}</div>`)
    .join("");

  const text = data.text || "";
  const html = data.html || "";
  $("ov-text").textContent = text || (html ? "(HTML message — use “Show HTML”.)" : "(empty body)");
  overlay.dataset.html = html;
  overlay.dataset.text = text;
  const toggle = $("ov-toggle");
  if (html) {
    toggle.classList.remove("hidden");
    toggle.textContent = "Show HTML";
    $("ov-html").classList.add("hidden");
    $("ov-text").classList.remove("hidden");
  } else {
    toggle.classList.add("hidden");
  }
}

function toggleBody() {
  const showingHtml = !$("ov-html").classList.contains("hidden");
  const toggle = $("ov-toggle");
  if (showingHtml) {
    $("ov-html").classList.add("hidden");
    $("ov-text").classList.remove("hidden");
    toggle.textContent = "Show HTML";
  } else {
    // srcdoc + sandbox keeps scripts and remote loads from running.
    $("ov-html").srcdoc = overlay.dataset.html || "";
    $("ov-html").classList.remove("hidden");
    $("ov-text").classList.add("hidden");
    toggle.textContent = "Show text";
  }
}

function closeOverlay() {
  overlay.classList.add("hidden");
  $("ov-html").srcdoc = "";
}

// --- job status polling ----------------------------------------------------
function startJobPolling() { pollJobs(); }

async function pollJobs() {
  let data;
  try {
    data = await fetchJSON("/api/jobs");
  } catch {
    return;
  }
  const jobs = data.jobs || [];
  const active = jobs.filter((j) => j.status === "pending" || j.status === "running");
  renderStatus(jobs, active);

  clearTimeout(jobPollTimer);
  if (active.length > 0) {
    jobPollTimer = setTimeout(pollJobs, 3000);
  }
}

function renderStatus(jobs, active) {
  if (active.length === 0) {
    // Show the most recent finished job briefly, else hide.
    const last = jobs[0];
    if (last && (last.status === "failed")) {
      statusBar.className = "status-bar error";
      statusBar.textContent = `Job #${last.id} (${labelFor(last.action)}) failed: ${last.error || ""}`;
      statusBar.classList.remove("hidden");
    } else {
      statusBar.classList.add("hidden");
    }
    return;
  }
  statusBar.className = "status-bar";
  statusBar.textContent = active
    .map((j) => `${labelFor(j.action)}: ${j.processed}/${j.total} (${j.status})`)
    .join("   •   ");
  statusBar.classList.remove("hidden");
}

// --- misc helpers ----------------------------------------------------------
function hideMoveMenu() { moveMenu.classList.add("hidden"); }

function labelFor(action) {
  return {
    release: "Release",
    report_release: "Report & Release",
    delete: "Delete",
    move: "Move",
  }[action] || action;
}

function formatDate(d) {
  if (!d) return "";
  return d.replace("T", " ").slice(0, 19);
}

async function fetchJSON(url, opts = {}) {
  const res = await fetch(url, {
    headers: { "Content-Type": "application/json" },
    ...opts,
  });
  if (res.status === 401) { window.location = "/login"; throw new Error("Not signed in"); }
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error(data.error || data.detail || `HTTP ${res.status}`);
  return data;
}

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

init();