// 检查是否已经初始化
if (window.translationToolInitialized) {
  throw new Error('Translation tool already initialized');
}
window.translationToolInitialized = true;

let isSelecting = false;
let startX, startY;
let selectionElement = null;
let translationPopup = null;

// 监听来自background的消息
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  if (request.action === 'startSelection') {
    startSelectionMode();
  }
});

function startSelectionMode() {
  if (isSelecting) return;
  
  isSelecting = true;
  
  const overlay = document.createElement('div');
  overlay.className = 'page-overlay';
  document.body.appendChild(overlay);
  
  selectionElement = document.createElement('div');
  selectionElement.className = 'selection-overlay';
  document.body.appendChild(selectionElement);
  
  document.addEventListener('mousedown', handleMouseDown);
  document.addEventListener('mousemove', handleMouseMove);
  document.addEventListener('mouseup', handleMouseUp);
  
  document.addEventListener('keydown', handleKeyDown);
}

function handleMouseDown(e) {
  if (!isSelecting) return;
  startX = e.clientX;
  startY = e.clientY;
  updateSelectionBox(e);
}

function handleMouseMove(e) {
  if (!isSelecting || !startX) return;
  updateSelectionBox(e);
}

function handleMouseUp(e) {
  if (!isSelecting) return;
  
  const selectedText = getTextFromArea(
    Math.min(startX, e.clientX),
    Math.min(startY, e.clientY),
    Math.abs(e.clientX - startX),
    Math.abs(e.clientY - startY)
  );

  if (selectedText.trim()) {
    translateText(selectedText.trim(), e.clientX, e.clientY);
  }

  cleanup();
}

function updateSelectionBox(e) {
  const left = Math.min(startX, e.clientX);
  const top = Math.min(startY, e.clientY);
  const width = Math.abs(e.clientX - startX);
  const height = Math.abs(e.clientY - startY);

  selectionElement.style.left = left + 'px';
  selectionElement.style.top = top + 'px';
  selectionElement.style.width = width + 'px';
  selectionElement.style.height = height + 'px';
}

function getTextFromArea(left, top, width, height) {
  const elements = document.elementsFromPoint(left + width/2, top + height/2);
  for (const element of elements) {
    if (element.textContent && element !== selectionElement) {
      return element.textContent;
    }
  }
  return '';
}

async function translateText(text, x, y) {
  try {
    // 通过 chrome.runtime.sendMessage 发送翻译请求
    const result = await chrome.runtime.sendMessage({
      action: 'translate',
      text: text
    });
    
    if (result && result.trans_result && result.trans_result[0]) {
      showTranslation(result.trans_result[0].dst, x, y);
    } else {
      showTranslation('Translation failed', x, y);
    }
  } catch (error) {
    console.error('Translation failed:', error);
    showTranslation('Translation failed', x, y);
  }
}

function showTranslation(translatedText, x, y) {
  if (translationPopup) {
    translationPopup.remove();
  }

  translationPopup = document.createElement('div');
  translationPopup.className = 'translation-popup';
  translationPopup.textContent = translatedText;
  
  translationPopup.style.left = x + 'px';
  translationPopup.style.top = (y + 20) + 'px';
  
  document.body.appendChild(translationPopup);

  // 点击其他地方关闭翻译框
  document.addEventListener('click', function closePopup(e) {
    if (e.target !== translationPopup) {
      translationPopup.remove();
      document.removeEventListener('click', closePopup);
    }
  });
}

function cleanup() {
  isSelecting = false;
  
  const overlay = document.querySelector('.page-overlay');
  if (overlay) {
    overlay.remove();
  }
  
  if (selectionElement) {
    selectionElement.remove();
    selectionElement = null;
  }
  
  startX = startY = null;
  
  document.removeEventListener('mousedown', handleMouseDown);
  document.removeEventListener('mousemove', handleMouseMove);
  document.removeEventListener('mouseup', handleMouseUp);
  document.removeEventListener('keydown', handleKeyDown);
}

function handleKeyDown(e) {
  // 检测 Mac 和 Windows 的按键
  const isMac = navigator.platform.toUpperCase().indexOf('MAC') >= 0;
  const triggerKey = isMac ? e.metaKey : e.ctrlKey;
  
  if (e.key === 'Escape' || (triggerKey && e.key === 'q')) {
    cleanup();
  }
}

// 添加 MD5 函数
function md5(string) {
  function md5_RotateLeft(lValue, iShiftBits) {
    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
  }

  function md5_AddUnsigned(lX, lY) {
    var lX4, lY4, lX8, lY8, lResult;
    lX8 = (lX & 0x80000000);
    lY8 = (lY & 0x80000000);
    lX4 = (lX & 0x40000000);
    lY4 = (lY & 0x40000000);
    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);
    if (lX4 & lY4) {
      return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
    }
    if (lX4 | lY4) {
      if (lResult & 0x40000000) {
        return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
      } else {
        return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
      }
    } else {
      return (lResult ^ lX8 ^ lY8);
    }
  }

  function md5_F(x, y, z) {
    return (x & y) | ((~x) & z);
  }

  function md5_G(x, y, z) {
    return (x & z) | (y & (~z));
  }

  function md5_H(x, y, z) {
    return (x ^ y ^ z);
  }

  function md5_I(x, y, z) {
    return (y ^ (x | (~z)));
  }

  function md5_FF(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac));
    return md5_AddUnsigned(md5_RotateLeft(a, s), b);
  }

  function md5_GG(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac));
    return md5_AddUnsigned(md5_RotateLeft(a, s), b);
  }

  function md5_HH(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac));
    return md5_AddUnsigned(md5_RotateLeft(a, s), b);
  }

  function md5_II(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac));
    return md5_AddUnsigned(md5_RotateLeft(a, s), b);
  }

  function md5_ConvertToWordArray(string) {
    var lWordCount;
    var lMessageLength = string.length;
    var lNumberOfWords_temp1 = lMessageLength + 8;
    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
    var lWordArray = Array(lNumberOfWords - 1);
    var lBytePosition = 0;
    var lByteCount = 0;
    while (lByteCount < lMessageLength) {
      lWordCount = (lByteCount - (lByteCount % 4)) / 4;
      lBytePosition = (lByteCount % 4) * 8;
      lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));
      lByteCount++;
    }
    lWordCount = (lByteCount - (lByteCount % 4)) / 4;
    lBytePosition = (lByteCount % 4) * 8;
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
    return lWordArray;
  }

  function md5_WordToHex(lValue) {
    var WordToHexValue = "", WordToHexValue_temp = "", lByte, lCount;
    for (lCount = 0; lCount <= 3; lCount++) {
      lByte = (lValue >>> (lCount * 8)) & 255;
      WordToHexValue_temp = "0" + lByte.toString(16);
      WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);
    }
    return WordToHexValue;
  }

  function md5_Utf8Encode(string) {
    string = string.replace(/\r\n/g, "\n");
    var utftext = "";
    for (var n = 0; n < string.length; n++) {
      var c = string.charCodeAt(n);
      if (c < 128) {
        utftext += String.fromCharCode(c);
      } else if ((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192);
        utftext += String.fromCharCode((c & 63) | 128);
      } else {
        utftext += String.fromCharCode((c >> 12) | 224);
        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
        utftext += String.fromCharCode((c & 63) | 128);
      }
    }
    return utftext;
  }

  var x = Array();
  var k, AA, BB, CC, DD, a, b, c, d;
  var S11 = 7, S12 = 12, S13 = 17, S14 = 22;
  var S21 = 5, S22 = 9, S23 = 14, S24 = 20;
  var S31 = 4, S32 = 11, S33 = 16, S34 = 23;
  var S41 = 6, S42 = 10, S43 = 15, S44 = 21;
  string = md5_Utf8Encode(string);
  x = md5_ConvertToWordArray(string);
  a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
  for (k = 0; k < x.length; k += 16) {
    AA = a; BB = b; CC = c; DD = d;
    a = md5_FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
    d = md5_FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
    c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
    b = md5_FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
    a = md5_FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
    d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
    c = md5_FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
    b = md5_FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
    a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
    d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
    c = md5_FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
    b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
    a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
    d = md5_FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
    c = md5_FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
    b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
    a = md5_GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
    d = md5_GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
    c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
    b = md5_GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
    a = md5_GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
    d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453);
    c = md5_GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
    b = md5_GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
    a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
    d = md5_GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
    c = md5_GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
    b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
    a = md5_GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
    d = md5_GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
    c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
    b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
    a = md5_HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
    d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
    c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
    b = md5_HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
    a = md5_HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
    d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
    c = md5_HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
    b = md5_HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
    a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
    d = md5_HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
    c = md5_HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
    b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
    a = md5_HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
    d = md5_HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
    c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
    b = md5_HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
    a = md5_II(a, b, c, d, x[k + 0], S41, 0xF4292244);
    d = md5_II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
    c = md5_II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
    b = md5_II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
    a = md5_II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
    d = md5_II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
    c = md5_II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
    b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
    a = md5_II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
    d = md5_II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
    c = md5_II(c, d, a, b, x[k + 6], S43, 0xA3014314);
    b = md5_II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
    a = md5_II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
    d = md5_II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
    c = md5_II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
    b = md5_II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
    a = md5_AddUnsigned(a, AA);
    b = md5_AddUnsigned(b, BB);
    c = md5_AddUnsigned(c, CC);
    d = md5_AddUnsigned(d, DD);
  }
  return (md5_WordToHex(a) + md5_WordToHex(b) + md5_WordToHex(c) + md5_WordToHex(d)).toLowerCase();
}