const API_BASE = "http://localhost:5200";
let debounceTimer = null;
let lastReportedUrl = "";
let lastReportedTitle = "";

function reportTab(tab) {
  if (!tab || !tab.url || tab.url.startsWith("chrome://") || tab.url.startsWith("chrome-extension://")) {
    return;
  }

  // Skip if same as last reported
  if (tab.url === lastReportedUrl && tab.title === lastReportedTitle) {
    return;
  }

  // Debounce: wait 2 seconds before reporting
  if (debounceTimer) {
    clearTimeout(debounceTimer);
  }

  debounceTimer = setTimeout(() => {
    const payload = {
      source: "ChromeExtension",
      appName: "chrome.exe",
      windowTitle: tab.title || "",
      url: tab.url
    };

    fetch(`${API_BASE}/api/context`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload)
    })
      .then(() => {
        lastReportedUrl = tab.url;
        lastReportedTitle = tab.title;
      })
      .catch(err => console.warn("Failed to report context:", err));
  }, 2000);
}

// Tab switched
chrome.tabs.onActivated.addListener((activeInfo) => {
  chrome.tabs.get(activeInfo.tabId, (tab) => {
    if (chrome.runtime.lastError) return;
    reportTab(tab);
  });
});

// Navigation within tab
chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (changeInfo.status === "complete" && tab.active) {
    reportTab(tab);
  }
});