const pendingAutofill = new Map();

chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  // Inject script once the tab is completely loaded
  if (changeInfo.status === 'complete' && pendingAutofill.has(tabId)) {
    const creds = pendingAutofill.get(tabId);

    // Ensure we are injecting on the correct URL (prevent injecting if user navigated away quickly)
    if (tab.url && tab.url.startsWith(creds.targetUrl)) {
      // Remove to prevent multiple injections
      pendingAutofill.delete(tabId);

      chrome.scripting.executeScript({
        target: { tabId: tabId },
        func: autoFillLogin,
        args: [creds.username, creds.password]
      }).catch(err => console.error("[QuickPurge] Injection error:", err));
    }
  }
});

chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.action === "purgeAndRedirect") {
    const { domain, targetUrl, username, password } = request;

    // Remove http/https and any path, just keep the exact domain or subdomain
    let cleanDomain = domain.replace(/^https?:\/\//, '').split('/')[0];

    // Create the origin array as expected by browsingData API
    const origins = [
      `http://${cleanDomain}`,
      `https://${cleanDomain}`
    ];

    // 1. 快速清理核心缓存
    chrome.browsingData.remove({
      "origins": origins
    }, {
      cookies: true,
      localStorage: true,
      indexedDB: true
    }, () => {
      // 执行清理后跳转并记录准备填写的Tab信息
      chrome.tabs.query({ active: true, currentWindow: true }, (tabs) => {
        let activeTabId;
        if (tabs && tabs.length > 0) {
          activeTabId = tabs[0].id;
          chrome.tabs.update(activeTabId, { url: targetUrl });
        } else {
          chrome.tabs.create({ url: targetUrl }, (newTab) => {
            if (newTab) {
              pendingAutofill.set(newTab.id, { username, password, targetUrl });
            }
          });
          sendResponse({ success: true });
          return;
        }

        if (activeTabId) {
          pendingAutofill.set(activeTabId, { username, password, targetUrl });
        }
        sendResponse({ success: true });
      });
    });

    // 2. 异步清理磁盘 Cache
    chrome.browsingData.remove({
      "origins": origins
    }, {
      cache: true
    }, () => {
      console.log(`[QuickPurge] Cache cleared asynchronously for ${domain}`);
    });

    return true;
  }
});

/**
 * 这一段代码是在目标页面的上下文中执行的 (Content Script Environment)
 */
function autoFillLogin(username, password) {
  let tries = 0;

  // Simulate complex events common in SPAs (React/Vue)
  function triggerEvents(element) {
    element.dispatchEvent(new Event('input', { bubbles: true }));
    element.dispatchEvent(new Event('change', { bubbles: true }));
    element.dispatchEvent(new Event('blur', { bubbles: true }));
  }

  // Workaround for React's hijacked value setter
  function setNativeValue(element, value) {
    const valueSetter = Object.getOwnPropertyDescriptor(element, 'value')?.set;
    const prototype = Object.getPrototypeOf(element);
    const prototypeValueSetter = Object.getOwnPropertyDescriptor(prototype, 'value')?.set;

    if (valueSetter && valueSetter !== prototypeValueSetter) {
      prototypeValueSetter.call(element, value);
    } else if (valueSetter) {
      valueSetter.call(element, value);
    } else {
      element.value = value;
    }
  }

  function tryFill() {
    tries++;
    // Commonly used selectors for username
    const userInputs = document.querySelectorAll('input[type="text"], input[type="email"], input[type="tel"], input[name*="user"], input[name*="account"], input[placeholder*="账号"], input[placeholder*="手机"]');
    const passInputs = document.querySelectorAll('input[type="password"]');

    let usernameEl = null;
    let passwordEl = null;

    // Find the first visible inputs
    for (let el of userInputs) {
      if (el.offsetWidth > 0 && el.offsetHeight > 0 && el.type !== 'password') {
        usernameEl = el;
        break;
      }
    }

    for (let el of passInputs) {
      if (el.offsetWidth > 0 && el.offsetHeight > 0) {
        passwordEl = el;
        break;
      }
    }

    if (usernameEl && passwordEl) {
      // Set values and trigger React/Vue update events
      usernameEl.focus();
      setNativeValue(usernameEl, username);
      triggerEvents(usernameEl);

      // Short delay usually helps some JS frameworks process the first input state
      setTimeout(() => {
        passwordEl.focus();
        setNativeValue(passwordEl, password);
        triggerEvents(passwordEl);
      }, 50);

      return true;
    }

    return false;
  }

  if (!tryFill()) {
    // Retry finding the elements for up to 5 seconds (useful for Single Page Applications where form rendered delayed)
    const interval = setInterval(() => {
      if (tryFill() || tries > 20) {
        clearInterval(interval);
      }
    }, 250);
  }
}