export class HTMLBuilder {
  static createBaseHTML(): string {
    const faviconData = this.getFaviconDataURL();
    return `
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dumber Browser</title>
    <link rel="icon" type="image/svg+xml" href="${faviconData}">
    <style>
        ${this.getStyles()}
    </style>
</head>
<body>
    <div class="container">
        <div class="history-section">
            <h2 class="section-title">Recent History</h2>
            <div id="historyList" class="history-list">
                <div class="loading">Loading history...</div>
            </div>
        </div>
        
        <div class="shortcuts-section">
            <h2 class="section-title">Search Shortcuts</h2>
            <div id="shortcuts" class="shortcuts-grid">
                <div class="loading">Loading shortcuts...</div>
            </div>
        </div>
    </div>
    <script type="module" src="./main.js"></script>
</body>
</html>`;
  }

  private static getFaviconDataURL(): string {
    const svg = HTMLBuilder.getFaviconSVG();
    // Minimal encoding for safe inline usage
    const encoded = encodeURIComponent(svg)
      .replace(/'/g, '%27')
      .replace(/\(/g, '%28')
      .replace(/\)/g, '%29');
    return `data:image/svg+xml;utf8,${encoded}`;
  }

  static getFaviconSVG(): string {
    // Stylized D with speed bolt on a subtle dark rounded card
    return `<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
  <defs>
    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
      <stop offset="0%" stop-color="#121212"/>
      <stop offset="100%" stop-color="#1e1e1e"/>
    </linearGradient>
    <filter id="inset" x="-20%" y="-20%" width="140%" height="140%">
      <feOffset dx="0" dy="1"/>
      <feGaussianBlur stdDeviation="0.6" result="blur"/>
      <feComposite in2="SourceAlpha" operator="out"/>
      <feColorMatrix type="matrix" values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.5 0"/>
      <feBlend in="SourceGraphic" mode="normal"/>
    </filter>
  </defs>
  <rect x="4" y="4" width="56" height="56" rx="14" ry="14" fill="url(#bg)" filter="url(#inset)"/>
  <rect x="4.5" y="4.5" width="55" height="55" rx="13.5" ry="13.5" fill="none" stroke="#252a2f" stroke-width="1"/>
  <!-- D glyph (slightly larger and wider) -->
  <path d="M20 16 L20 48 M20 16 H34 q12 0 12 16 t-12 16 H20" fill="none" stroke="#e9eef3" stroke-width="4.5" stroke-linecap="round" stroke-linejoin="round" transform="translate(33,32) scale(1.12,1.10) translate(-33,-32)"/>
  <!-- Speed bolt accent (significantly larger, centered) -->
  <path d="M36 22 L32 34 h6 l-8 16 4-12 h-6 z" fill="#ff9800" opacity="0.95" transform="translate(33,32) scale(1.8) translate(-33,-32) translate(0,-3)"/>
</svg>`;
  }

  private static getStyles(): string {
    return `
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #1a1a1a;
            color: #ffffff;
            height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden; /* prevent horizontal scroll from long content */
        }
        
        .container {
            flex: 1;
            display: flex;
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
            padding: 2rem;
            gap: 2rem;
            overflow-x: hidden;
        }
        
        .history-section {
            flex: 1;
            min-height: 0;
            min-width: 0; /* allow flex child to shrink */
        }
        
        .shortcuts-section {
            flex: 1;
            min-height: 0;
            min-width: 0; /* allow flex child to shrink */
        }
        
        .section-title {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: #ffffff;
            border-bottom: 2px solid #404040;
            padding-bottom: 0.5rem;
        }
        
        .history-list {
            overflow-y: auto;
            overflow-x: hidden;
            max-height: calc(100vh - 8rem);
            max-width: 100%;
        }
        
        .history-item {
            padding: 0.75rem;
            margin-bottom: 0.5rem;
            background: #2d2d2d;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
            border-left: 3px solid #404040;
            overflow: hidden;
            max-width: 100%;
        }
        
        .history-item:hover {
            background: #3d3d3d;
            border-left-color: #0066cc;
        }
        
        .history-line {
            display: flex;
            gap: 0.5rem;
            white-space: nowrap;
            align-items: center;
            overflow: hidden;
            width: 100%;
            min-width: 0; /* allow flex children to shrink */
        }
        .history-favicon-chip {
            flex: 0 0 20px;
            width: 20px; height: 20px;
            border-radius: 50%;
            background: #ccc;
            border: 1px solid rgba(0,0,0,.12);
            box-shadow: 0 1px 2px rgba(0,0,0,.12);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .history-favicon-img {
            width: 16px; height: 16px;
            filter: brightness(1.06) contrast(1.03);
            image-rendering: -webkit-optimize-contrast;
        }

        .history-title { font-size: 0.95rem; color: #e6e6e6; flex: 0 0 auto; }
        .history-domain { font-size: 0.9rem; color: #a5a5a5; flex: 0 0 auto; }
        .history-sep { color: #666; flex: 0 0 auto; }
        .history-url {
            font-size: 0.9rem;
            color: #7a7a7a; /* darker than domain */
            flex: 1 1 auto;
            min-width: 0; /* critical for flex truncation */
            overflow: hidden;
            text-overflow: ellipsis; /* fallback */
            -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,1) 85%, rgba(0,0,0,0) 100%);
            mask-image: linear-gradient(to right, rgba(0,0,0,1) 85%, rgba(0,0,0,0) 100%);
        }
        
        .shortcuts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            max-height: calc(100vh - 8rem);
            overflow-y: auto;
        }
        
        .shortcut {
            padding: 1rem;
            background: #2d2d2d;
            border: 2px solid #404040;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
            text-align: center;
        }
        
        .shortcut:hover {
            background: #3d3d3d;
            border-color: #0066cc;
            transform: translateY(-2px);
        }
        
        .shortcut-key {
            font-weight: bold;
            color: #0066cc;
            margin-bottom: 0.5rem;
            font-size: 1.1rem;
        }
        
        .shortcut-desc {
            color: #888;
            font-size: 0.9rem;
        }
        
        .loading {
            padding: 2rem;
            text-align: center;
            color: #888;
        }
        
        .empty-state {
            padding: 3rem 2rem;
            text-align: center;
            color: #666;
        }
        
        .empty-state h3 {
            margin-bottom: 1rem;
            color: #888;
        }
        
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
                padding: 1rem;
            }
            
            .shortcuts-grid {
                grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            }
        }
    `;
  }
}