const TRACKER_FILE = "content/tracker.js";

function storageGet(keys) {
  return new Promise((resolve) => {
    chrome.storage.local.get(keys, resolve);
  });
}

function storageSet(obj) {
  return new Promise((resolve) => {
    chrome.storage.local.set(obj, resolve);
  });
}

function storageRemove(keys) {
  return new Promise((resolve) => {
    chrome.storage.local.remove(keys, resolve);
  });
}

function tabsQuery(queryInfo) {
  return new Promise((resolve) => {
    chrome.tabs.query(queryInfo, resolve);
  });
}

function executeScript(details) {
  return new Promise((resolve, reject) => {
    chrome.scripting.executeScript(details, () => {
      const err = chrome.runtime.lastError;
      if (err) {
        reject(new Error(err.message));
        return;
      }
      resolve();
    });
  });
}

const els = {
  record: document.getElementById("record"),
  stop: document.getElementById("stop"),
  exportSection: document.getElementById("export-section"),
  exportJson: document.getElementById("export-json"),
  copy: document.getElementById("copy"),
  copyStatus: document.getElementById("copy-status"),
  hint: document.getElementById("hint"),
  navHint: document.getElementById("nav-hint"),
};

function isRestrictedUrl(url) {
  if (!url) {
    return true;
  }
  const u = url.toLowerCase();
  return (
    u.startsWith("chrome://") ||
    u.startsWith("chrome-extension://") ||
    u.startsWith("edge://") ||
    u.startsWith("about:") ||
    u.startsWith("moz-extension://") ||
    u.startsWith("devtools:") ||
    u.startsWith("view-source:")
  );
}

async function getActiveTab() {
  const tabs = await tabsQuery({ active: true, currentWindow: true });
  return tabs[0];
}

async function injectTracker(tabId) {
  await executeScript({
    target: { tabId },
    files: [TRACKER_FILE],
  });
}

function sendToTab(tabId, message) {
  return new Promise((resolve, reject) => {
    chrome.tabs.sendMessage(tabId, message, (response) => {
      const err = chrome.runtime.lastError;
      if (err) {
        reject(new Error(err.message));
        return;
      }
      resolve(response);
    });
  });
}

async function clearRecordingStorage() {
  await storageRemove(["recording", "recordingTabId"]);
}

function setRecordingUi(isRecording, showExport) {
  els.record.classList.toggle("hidden", isRecording);
  els.stop.classList.toggle("hidden", !isRecording);
  els.stop.disabled = !isRecording;
  els.navHint.classList.toggle("hidden", !isRecording);
  els.exportSection.classList.toggle("hidden", !showExport);
}

async function syncStateFromTab() {
  const tab = await getActiveTab();
  const data = await storageGet(["recording", "recordingTabId"]);

  if (!tab?.id) {
    setRecordingUi(false, !!els.exportJson.value);
    return;
  }

  if (!data.recording || data.recordingTabId !== tab.id) {
    setRecordingUi(false, !!els.exportJson.value);
    return;
  }

  if (isRestrictedUrl(tab.url)) {
    await clearRecordingStorage();
    setRecordingUi(false, !!els.exportJson.value);
    return;
  }

  try {
    await injectTracker(tab.id);
    const status = await sendToTab(tab.id, { type: "GET_STATUS" });
    if (status && status.recording) {
      setRecordingUi(true, !!els.exportJson.value);
    } else {
      await clearRecordingStorage();
      setRecordingUi(false, !!els.exportJson.value);
    }
  } catch {
    await clearRecordingStorage();
    setRecordingUi(false, !!els.exportJson.value);
  }
}

els.record.addEventListener("click", async () => {
  els.copyStatus.textContent = "";
  const tab = await getActiveTab();
  if (!tab?.id) {
    return;
  }
  if (isRestrictedUrl(tab.url)) {
    els.hint.textContent =
      "Opnemen werkt niet op deze pagina (browser-interne URL). Open een normale website.";
    return;
  }

  try {
    await injectTracker(tab.id);
    await sendToTab(tab.id, { type: "START_RECORDING" });
    await storageSet({
      recording: true,
      recordingTabId: tab.id,
    });
    els.exportJson.value = "";
    setRecordingUi(true, false);
    els.hint.textContent =
      "Interacties worden vastgelegd. Druk op Stop om de JSON te tonen.";
  } catch (e) {
    els.hint.textContent =
      "Kon niet starten: ververs de pagina of controleer of de site scripts toestaat.";
    console.error(e);
  }
});

els.stop.addEventListener("click", async () => {
  els.copyStatus.textContent = "";
  const tab = await getActiveTab();
  const data = await storageGet(["recordingTabId"]);

  if (!tab?.id || tab.id !== data.recordingTabId) {
    await clearRecordingStorage();
    setRecordingUi(false, false);
    els.hint.textContent = "Geen actieve opname op dit tabblad.";
    return;
  }

  try {
    await injectTracker(tab.id);
    const response = await sendToTab(tab.id, {
      type: "STOP_AND_GET_INTERACTIONS",
    });
    await clearRecordingStorage();

    const interactions = response?.interactions ?? [];
    els.exportJson.value = JSON.stringify(interactions, null, 2);
    setRecordingUi(false, true);
    els.hint.textContent =
      "JSON hieronder. Gebruik Kopiëren of selecteer de tekst handmatig.";
  } catch (e) {
    await clearRecordingStorage();
    setRecordingUi(false, false);
    els.hint.textContent =
      "Stoppen mislukt (pagina mogelijk vernieuwd). Start opnieuw met Opnemen.";
    console.error(e);
  }
});

els.copy.addEventListener("click", async () => {
  const text = els.exportJson.value;
  if (!text) {
    return;
  }
  try {
    await navigator.clipboard.writeText(text);
    els.copyStatus.textContent = "Gekopieerd naar klembord.";
  } catch {
    els.exportJson.select();
    els.copyStatus.textContent = "Selecteer Cmd/Ctrl+C om te kopiëren.";
  }
});

syncStateFromTab();