// --- LifeScrobbler background script ---
// Requires shared_settings.js for DEFAULT_SETTINGS and helpers.

const activeTabs = new Map();   // tabId -> timeout
const currentURLs = new Map();  // tabId -> current URL
const pausedTabs = new Set();   // tabId -> paused state

// ---------------------------------------------------------------------------
// Utility helpers
// ---------------------------------------------------------------------------

async function getSettings() {
  return new Promise(resolve => {
    browser.storage.local.get(DEFAULT_SETTINGS, resolve);
  });
}

function updateIcon(tabId, state) {
  const icons = {
    paused: "icons/icon-paused.png",
    wait: "icons/icon-wait.png",
    scrobbled: "icons/icon-scrobbled.png"
  };
  const path = icons[state] || "icons/icon-32.png";
  browser.browserAction.setIcon({ tabId, path });
}

// Enhanced blacklist matcher with wildcard and regex support
function isBlacklisted(url, blacklist) {
  try {
    const { hostname, href } = new URL(url);
    const extraBlacklist = ["moz-extension://"]; // always skipped
    const combined = [...blacklist, ...extraBlacklist];

    return combined.some(entry => {
      if (!entry) return false;
      entry = entry.trim();

      // Regex support
      if (entry.startsWith("/") && entry.endsWith("/")) {
        try {
          const re = new RegExp(entry.slice(1, -1));
          return re.test(href);
        } catch {
          return false;
        }
      }

      // Wildcard domain support
      if (entry.startsWith("*.")) {
        const domain = entry.slice(2).toLowerCase();
        return (
          hostname.toLowerCase().endsWith("." + domain) ||
          hostname.toLowerCase() === domain
        );
      }

      // Substring match
      return href.includes(entry);
    });
  } catch (e) {
    console.warn("isBlacklisted error:", e);
    return false;
  }
}

// Per-site delay override (e.g., amazon.com every 1 second)
function getDelayForUrl(url, settings) {
  const hostname = new URL(url).hostname;
  const overrides = settings.siteDelays || {};
  for (const [pattern, delay] of Object.entries(overrides)) {
    if (hostname.includes(pattern)) {
      return delay;
    }
  }
  return settings.delaySeconds;
}

// ---------------------------------------------------------------------------
// Scrobbling functions
// ---------------------------------------------------------------------------

async function scrobbleStart(url, baseUrl, referrer = null) {
  let endpoint = `${baseUrl}/?source=Firefox&scrobble_url=${encodeURIComponent(url)}`;
  if (referrer) endpoint += `&referrer=${encodeURIComponent(referrer)}`;

  try {
    await fetch(endpoint, { method: "GET" });
    console.log("LifeScrobbler: started", url, referrer ? `(ref: ${referrer})` : "");
  } catch (err) {
    console.error("LifeScrobbler: start failed", url, err);
  }
}

async function scrobbleStop(url, baseUrl) {
  if (!url) return;
  const endpoint = `${baseUrl}/?action=stop&scrobble_url=${encodeURIComponent(url)}`;
  try {
    await fetch(endpoint, { method: "GET" });
    console.log("LifeScrobbler: stopped", url);
  } catch (err) {
    console.error("LifeScrobbler: stop failed", url, err);
  }
}

// ---------------------------------------------------------------------------
// Event handlers
// ---------------------------------------------------------------------------

// Main listener: when navigating to a new URL
browser.webNavigation.onCommitted.addListener(async (details) => {
  if (details.frameId !== 0) return; // only main frame
  const tabId = details.tabId;
  const newUrl = details.url;
  const prevUrl = currentURLs.get(tabId) || null;
  currentURLs.set(tabId, newUrl);

  const settings = await getSettings();
  const { paused, blacklist, scrobbleBaseUrl } = settings;

  // Skip if paused or blacklisted
  if (paused || pausedTabs.has(tabId) || isBlacklisted(newUrl, blacklist)) return;

  // Stop previous URL first (if valid)
  if (prevUrl && !isBlacklisted(prevUrl, blacklist)) {
    scrobbleStop(prevUrl, scrobbleBaseUrl);
  }

  // Schedule start scrobble
  const siteDelay = getDelayForUrl(newUrl, settings);
  if (activeTabs.has(tabId)) clearTimeout(activeTabs.get(tabId));

  const timeout = setTimeout(() => {
    scrobbleStart(newUrl, scrobbleBaseUrl, prevUrl);
    updateIcon(tabId, "scrobbled");
    setTimeout(() => updateIcon(tabId, "wait"), 3000);
  }, siteDelay * 1000);

  activeTabs.set(tabId, timeout);
});

// Handle tab close (send stop)
browser.tabs.onRemoved.addListener(async (tabId) => {
  const url = currentURLs.get(tabId);
  if (!url) return;
  const settings = await getSettings();
  const { blacklist, scrobbleBaseUrl } = settings;
  if (isBlacklisted(url, blacklist)) return;
  scrobbleStop(url, scrobbleBaseUrl);
  activeTabs.delete(tabId);
  currentURLs.delete(tabId);
});

// Toggle pause via toolbar icon click
browser.browserAction.onClicked.addListener(async (tab) => {
  const settings = await getSettings();
  const tabId = tab.id;
  if (pausedTabs.has(tabId)) {
    pausedTabs.delete(tabId);
    updateIcon(tabId, "wait");
  } else {
    pausedTabs.add(tabId);
    updateIcon(tabId, "paused");
  }
  // Persist pause state
  await browser.storage.local.set({ pausedTabs: Array.from(pausedTabs) });
});

// Restore paused tabs on startup
(async function restorePausedTabs() {
  const data = await browser.storage.local.get({ pausedTabs: [] });
  for (const tabId of data.pausedTabs) pausedTabs.add(tabId);
})();