const api = typeof browser !== "undefined" ? browser : chrome;

const STORAGE_KEY = "dismissedListings";
const SETTINGS_KEY = "settings";

const els = {
  count: document.getElementById("count"),
  hideToggle: document.getElementById("hideToggle"),
  exportBtn: document.getElementById("exportBtn"),
  importBtn: document.getElementById("importBtn"),
  importFile: document.getElementById("importFile"),
  clearBtn: document.getElementById("clearBtn"),
  status: document.getElementById("status"),
};

function setStatus(msg) {
  els.status.textContent = msg;
  if (msg) setTimeout(() => (els.status.textContent = ""), 2500);
}

async function refresh() {
  const res = await api.storage.local.get([STORAGE_KEY, SETTINGS_KEY]);
  const dismissed = res[STORAGE_KEY] || {};
  const settings = res[SETTINGS_KEY] || {};
  const n = Object.keys(dismissed).length;
  els.count.textContent = n === 1 ? "1 listing dismissed" : `${n} listings dismissed`;
  els.hideToggle.checked = !!settings.hideDismissed;
}

els.hideToggle.addEventListener("change", async () => {
  const res = await api.storage.local.get(SETTINGS_KEY);
  const settings = res[SETTINGS_KEY] || {};
  settings.hideDismissed = els.hideToggle.checked;
  await api.storage.local.set({ [SETTINGS_KEY]: settings });
});

els.clearBtn.addEventListener("click", async () => {
  const res = await api.storage.local.get(STORAGE_KEY);
  const n = Object.keys(res[STORAGE_KEY] || {}).length;
  if (n === 0) {
    setStatus("Nothing to clear.");
    return;
  }
  const ok = confirm(`Clear all ${n} dismissals? This can't be undone.`);
  if (!ok) return;
  await api.storage.local.set({ [STORAGE_KEY]: {} });
  await refresh();
  setStatus("Cleared.");
});

els.exportBtn.addEventListener("click", async () => {
  const res = await api.storage.local.get(STORAGE_KEY);
  const data = res[STORAGE_KEY] || {};
  const blob = new Blob([JSON.stringify(data, null, 2)], { type: "application/json" });
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  const stamp = new Date().toISOString().slice(0, 10);
  a.href = url;
  a.download = `autotrader-marker-${stamp}.json`;
  document.body.appendChild(a);
  a.click();
  a.remove();
  URL.revokeObjectURL(url);
  setStatus("Exported.");
});

els.importBtn.addEventListener("click", () => els.importFile.click());
els.importFile.addEventListener("change", async (e) => {
  const file = e.target.files[0];
  if (!file) return;
  try {
    const text = await file.text();
    const parsed = JSON.parse(text);
    if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
      throw new Error("Expected an object keyed by listing id");
    }
    const res = await api.storage.local.get(STORAGE_KEY);
    const merged = { ...(res[STORAGE_KEY] || {}), ...parsed };
    await api.storage.local.set({ [STORAGE_KEY]: merged });
    await refresh();
    setStatus(`Imported ${Object.keys(parsed).length} entries.`);
  } catch (err) {
    setStatus(`Import failed: ${err.message}`);
  } finally {
    els.importFile.value = "";
  }
});

api.storage.onChanged.addListener((changes, area) => {
  if (area === "local" && (changes[STORAGE_KEY] || changes[SETTINGS_KEY])) {
    refresh();
  }
});

refresh();