/* discgod popup — talks to the background worker only (which owns the token,
 * the Discogs API calls, and the server I/O). */

const $ = (id) => document.getElementById(id);
const send = (msg) => chrome.runtime.sendMessage(msg);

function toast(text, kind = "ok") {
  const t = $("toast");
  t.textContent = text;
  t.className = `toast show ${kind}`;
  setTimeout(() => (t.className = "toast"), 2600);
}

function setDot(state) {
  $("statusDot").className = "dot" + (state ? " " + state : "");
}

// --- load config ------------------------------------------------------------
async function loadConfig() {
  const cfg = await send({ type: "getConfig" });
  $("token").value = cfg.token || "";
  $("serverUrl").value = cfg.serverUrl || "";
  $("intervalHours").value = String(cfg.intervalHours || 12);
  $("autoCrawl").checked = cfg.autoCrawl !== false;
}

// --- watchlist --------------------------------------------------------------
function renderSellers(sellers) {
  const box = $("watchlist");
  if (!sellers || !sellers.length) {
    box.innerHTML = '<div class="empty">No sellers yet — add one above.</div>';
    return;
  }
  box.innerHTML = "";
  for (const s of sellers) {
    const el = document.createElement("div");
    el.className = "seller";
    const last = s.last_crawled_at
      ? new Date(s.last_crawled_at).toLocaleDateString()
      : "never";
    const statusErr = (s.last_status || "").startsWith("error");
    el.innerHTML = `
      <div style="flex:1; min-width:0">
        <div class="name">${escapeHtml(s.username)}</div>
        <div class="meta ${statusErr ? "err" : ""}">
          last ${last}${statusErr ? " · failed" : ""}
        </div>
      </div>
      <span class="count">${s.active_listings ?? 0}</span>
      <button data-act="scrape" data-u="${escapeAttr(s.username)}">Scrape</button>
      <button class="danger" data-act="remove" data-u="${escapeAttr(s.username)}">✕</button>`;
    box.appendChild(el);
  }
  box.querySelectorAll("button").forEach((b) =>
    b.addEventListener("click", onSellerAction)
  );
}

async function onSellerAction(e) {
  const u = e.currentTarget.dataset.u;
  const act = e.currentTarget.dataset.act;
  if (act === "remove") {
    await send({ type: "untrack", username: u });
    toast(`Stopped tracking ${u}`);
    refresh();
  } else if (act === "scrape") {
    await send({ type: "scrapeOne", username: u });
    toast(`Scraping ${u}…`);
    setDot("busy");
    pollStatus();
  }
}

async function refresh() {
  const tracked = await send({ type: "getTracked" }).catch(() => null);
  if (tracked && tracked.ok) renderSellers(tracked.sellers);
  else if (tracked && !tracked.ok) toast(tracked.error || "server unreachable", "err");

  const stats = await send({ type: "getStats" }).catch(() => null);
  if (stats && stats.ok) {
    $("s_active").textContent = fmt(stats.active_listings);
    $("s_watched").textContent = fmt(stats.sellers_watched);
    $("s_gone").textContent = fmt(stats.gone_7d);
    $("s_price").textContent = fmt(stats.price_changes_7d);
    $("lastCapture").lastElementChild.textContent = stats.last_capture
      ? new Date(stats.last_capture).toLocaleString()
      : "–";
    setDot("ok");
  } else {
    setDot("err");
  }
  pollStatus();
}

async function pollStatus() {
  const st = await send({ type: "status" }).catch(() => null);
  const line = $("statusLine");
  if (st && st.crawling) {
    setDot("busy");
    line.firstElementChild.textContent = `crawling… ${st.remaining} seller(s) left`;
    line.lastElementChild.textContent = st.queued ? `${st.queued} queued` : "";
    setTimeout(pollStatus, 2000);
  } else if (st) {
    line.firstElementChild.textContent = st.lastCrawlAt
      ? "last sweep " + new Date(st.lastCrawlAt).toLocaleTimeString()
      : "idle";
    line.lastElementChild.textContent = st.queued ? `${st.queued} queued (retrying)` : "";
  }
}

// --- events -----------------------------------------------------------------
$("save").addEventListener("click", async () => {
  await send({
    type: "setConfig",
    patch: {
      token: $("token").value.trim(),
      serverUrl: $("serverUrl").value.trim().replace(/\/$/, ""),
      intervalHours: parseInt($("intervalHours").value, 10),
      autoCrawl: $("autoCrawl").checked,
    },
  });
  toast("Saved");
  refresh();
});

$("testToken").addEventListener("click", async () => {
  await send({ type: "setConfig", patch: { token: $("token").value.trim() } });
  const r = await send({ type: "testToken" });
  if (r.ok) toast(`Token OK — signed in as ${r.username}`);
  else toast(r.error || "token failed", "err");
});

$("track").addEventListener("click", async () => {
  const username = $("newSeller").value.trim().replace(/^.*\/seller\//, "").split(/[/?]/)[0];
  if (!username) return;
  const filter = parseFilter($("newFilter").value.trim());
  const r = await send({ type: "track", body: { username, filter } });
  if (r.ok) {
    $("newSeller").value = "";
    $("newFilter").value = "";
    toast(`Tracking ${username}`);
    refresh();
  } else toast(r.error || "could not track", "err");
});

$("scrapeAll").addEventListener("click", async () => {
  await send({ type: "scrapeAll" });
  toast("Scraping all watched sellers…");
  setDot("busy");
  pollStatus();
});

$("refresh").addEventListener("click", refresh);

// Enter-to-track
$("newSeller").addEventListener("keydown", (e) => {
  if (e.key === "Enter") $("track").click();
});

// --- helpers ----------------------------------------------------------------
function parseFilter(str) {
  // "format=Vinyl&ships_from=Australia" -> {format:'Vinyl', ships_from:'Australia'}
  const out = {};
  if (!str) return out;
  for (const part of str.split("&")) {
    const [k, v] = part.split("=");
    if (k && v) out[k.trim()] = v.trim();
  }
  return out;
}
function fmt(n) { return n == null ? "–" : Number(n).toLocaleString(); }
function escapeHtml(s) {
  return String(s).replace(/[&<>"']/g, (c) =>
    ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
}
function escapeAttr(s) { return escapeHtml(s).replace(/"/g, "&quot;"); }

// --- init -------------------------------------------------------------------
(async function init() {
  await loadConfig();
  await refresh();
})();