// 創(chuàng)建動態(tài)水印層（混淆選擇器+隨機位置）
const createWatermark = () => {
  const wm = document.createElement('div');
  
  // 隨機生成類名（規(guī)避通配選擇器）
  const randomId = 'wm_' + Math.random().toString(36).slice(2, 8);
  wm.className = randomId;
  
  // 水印內(nèi)容（含用戶信息）
  wm.innerHTML = `? ${user.name} · ${new Date().toLocaleDateString()}`;
  
  // 隨機位置偏移（破壞自動化腳本）
  wm.style.left = `${Math.random() * 20}%`;
  wm.style.top = `${Math.random() * 15}vh`;
  
  // 核心樣式
  Object.assign(wm.style, {
    position: 'fixed',
    pointerEvents: 'none',
    opacity: '0.5',
    transform: `rotate(${Math.random() * 15 - 7.5}deg)`,
    zIndex: '2147483647' // 最大z-index值
  });
  
  document.body.appendChild(wm);
  return wm;
};

// MutationObserver監(jiān)聽水印移除
const initWatermarkGuard = () => {
  const wm = createWatermark();
  
  const observer = new MutationObserver((mutations) => {
    let watermarkRemoved = false;
    
    mutations.forEach(mutation => {
      if (mutation.removedNodes) {
        Array.from(mutation.removedNodes).forEach(node => {
          if (node === wm || node.contains?.(wm)) {
            watermarkRemoved = true;
          }
        });
      }
    });
    
    if (watermarkRemoved) {
      console.warn("水印被移除，正在重生...");
      document.body.removeEventListener('DOMNodeRemoved', handleRemove);
      observer.disconnect();
      createWatermark();
      initWatermarkGuard(); // 重新綁定監(jiān)聽
    }
  });
  
  // 深度監(jiān)聽整個body
  observer.observe(document.body, {
    childList: true,
    subtree: true,
    attributes: false,
    characterData: false
  });
  
  // 備份監(jiān)聽：處理iframe等特殊情況
  const handleRemove = (e) => {
    if (e.target === wm) {
      document.body.appendChild(wm.cloneNode(true));
    }
  };
  document.body.addEventListener('DOMNodeRemoved', handleRemove);
};

// Canvas內(nèi)容融合水?。P(guān)鍵數(shù)據(jù)防篡改）
const drawProtectedCanvas = (canvas) => {
  const ctx = canvas.getContext('2d');
  const img = new Image();
  
  img.onload = () => {
    ctx.drawImage(img, 0, 0);
    
    // 半透明水印覆蓋
    ctx.fillStyle = 'rgba(255,255,255,0.5)';
    ctx.font = 'bold 24px sans-serif';
    ctx.fillText('@' + user.id, canvas.width/2, canvas.height-30);
    
    // 隱形水?。ㄏ袼丶壊僮鳎?
    const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
    encodeWatermark(imageData.data, user.id); // 自定義編碼函數(shù)
    ctx.putImageData(imageData, 0, 0);
  };
  
  img.src = '/sensitive-image.jpg';
};

// 隱形水印編碼
function encodeWatermark(pixels, userId) {
  // LSB最低有效位隱寫術(shù)
  for (let i = 0; i < pixels.length; i += 4) {
    if (i % 16 === 0) {
      const charCode = userId.charCodeAt(Math.floor(i/16) % userId.length);
      const bit = (charCode >> Math.floor(i/16)%8) & 1;
      pixels[i] = (pixels[i] & 0xFE) | bit;
    }
  }
}

// DevTools開啟檢測（現(xiàn)代瀏覽器適配）
setInterval(() => {
  const devtools = {
    open: false,
    orientation: null
  };
  
  const threshold = 160; // 屏幕高度閾值
  
  const widthThreshold = window.outerWidth - window.innerWidth > threshold;
  const heightThreshold = window.outerHeight - window.innerHeight > threshold;
  const orientation = widthThreshold ? 'vertical' : 'horizontal';
  
  if (
    !devtools.open &&
    (heightThreshold || widthThreshold) &&
    devtools.orientation !== orientation
  ) {
    devtools.open = true;
    devtools.orientation = orientation;
    
    // 開發(fā)者工具打開時自動刷新
    window.location.reload();
  }
}, 1000);

// 基于SVG的矢量水?。≒DF導(dǎo)出保留）
const svgWM = `
  <svg xmlns="http://www.w3.org/2000/svg" width="200" height="100">
    <text x="50%" y="50%" 
          text-anchor="middle"
          fill-opacity="0.2"
          font-family="Arial"
          transform="rotate(-30)">
      ${user.name} ${new Date().toISOString()}
    </text>
  </svg>`;

const svgURL = `data:image/svg+xml,${encodeURIComponent(svgWM)}`;
document.body.style.backgroundImage = `url("${svgURL}")`;

// WebGL著色器注入水?。ㄖ饚秩荆?
const fragmentShader = `
  varying vec2 vUv;
  uniform sampler2D videoTexture;
  
  void main() {
    vec4 color = texture2D(videoTexture, vUv);
    vec2 center = vec2(0.5, 0.85);
    float dist = distance(vUv, center);
    
    if (dist < 0.2) {
      color.rgb = mix(color.rgb, vec3(1.0), 0.5);
      color.r = mod(color.r + 0.5, 1.0); // 添加顏色偏移
    }
    gl_FragColor = color;
  }`;

// 敏感操作時強化水印
function protectSensitiveAction() {
  createWatermark();
  document.body.classList.add('watermark-intensify');
  setTimeout(() => 
    document.body.classList.remove('watermark-intensify'), 
    5000
  );
}

// 關(guān)鍵接口添加數(shù)字水印
fetch('/api/export', {
  headers: {
    'X-Content-Signature': 
      btoa(`${user.id}|${window.location.host}|${Date.now()}`)
  }
})

// 檢測常見破解環(huán)境特征
const isTampered = 
  window.__watermarkGuard !== true || 
  navigator.webdriver === true;

if (isTampered) {
  document.body.innerHTML = '<h1>安全警告：非法環(huán)境訪問</h1>';
  window.stop();
}

// 水印渲染性能優(yōu)化
requestAnimationFrame(() => {
  const wm = createWatermark();
  setTimeout(() => wm.style.transition = 'opacity 0.3s', 100);
});