// build.js
const fs = require('fs');
const path = require('path');
const data = require('./data.js');

const template = fs.readFileSync(path.join(__dirname, 'template.html'), 'utf-8');

// 清理并创建 dist 目录
const distDir = path.join(__dirname, 'dist');
if (fs.existsSync(distDir)) {
    fs.rmSync(distDir, { recursive: true, force: true });
}
fs.mkdirSync(distDir);

// 创建子目录
const projectSubDir = path.join(distDir, data.siteConfig.basePath.replace(/^\//, ''));
if (!fs.existsSync(projectSubDir)) {
    fs.mkdirSync(projectSubDir, { recursive: true });
}

// 拷贝 assets 目录
const assetsDir = path.join(__dirname, 'assets');
const targetAssetsDir = path.join(projectSubDir, 'assets');
if (fs.existsSync(assetsDir)) {
    if (!fs.existsSync(targetAssetsDir)) fs.mkdirSync(targetAssetsDir, { recursive: true });
    fs.cpSync(assetsDir, targetAssetsDir, { recursive: true });
    console.log('✅ Assets 已同步');
}

data.languages.forEach(lang => {
    const content = data.content[lang];
    let html = template;

    const fullBasePath = data.siteConfig.basePath;
    const fullDomain = data.siteConfig.domain;

    html = html.replace(/{{langCode}}/g, lang);
    html = html.replace(/{{title}}/g, content.title);
    html = html.replace(/{{metaDesc}}/g, content.metaDesc);

    // SEO Dynamic Tags
    const canonicalUrl = `${fullDomain}${fullBasePath}/${lang}/index.html`;
    html = html.replace(/{{canonicalUrl}}/g, canonicalUrl);

    // Generate hreflang tags
    const hreflangTags = data.languages.map(l => {
        return `<link rel="alternate" hreflang="${l}" href="${fullDomain}${fullBasePath}/${l}/index.html" />`;
    }).join('\n    ');
    // Add x-default (usually English)
    const xDefault = `<link rel="alternate" hreflang="x-default" href="${fullDomain}${fullBasePath}/en/index.html" />`;
    html = html.replace(/{{hreflangTags}}/g, hreflangTags + '\n    ' + xDefault);

    // Use a default OG image or generate one (placeholder for now)
    html = html.replace(/{{ogImage}}/g, `${fullDomain}${fullBasePath}/assets/og-shared.jpg`);

    // 语言链接 - 动态生成 (保持相对路径，兼容性更好)
    const langLinksHtml = data.languages.map(l => {
        const lContent = data.content[l];
        if (l === lang) return `<span class="active-lang">${lContent.langName}</span>`;
        return `<a href="../${l}/index.html">${lContent.langName}</a>`;
    }).join('');
    html = html.replace(/{{languageLinks}}/g, langLinksHtml);

    // 表头
    const headersHtml = content.headers.map(h => `<th>${h}</th>`).join('');
    html = html.replace(/{{tableHeaders}}/g, headersHtml);

    // 表格行 + 详情行
    const rowsHtml = content.cities.map((city, idx) => `
        <tr id="row-${idx}" class="city-row" onclick="toggleDetails(${idx})">
            <td>
                <div class="city-name-cell">
                    <strong>${city.name}</strong>
                    <span class="tag-region">${city.region}</span>
                </div>
            </td>
            <td>${city.matches}</td>
            <td style="font-weight:600">${city.budget}</td>
            <td><span class="tag-visa ${city.vCls}">${city.visa}</span></td>
            <td style="color:#64748b; font-size:13px">${city.tips}</td>
        </tr>
        <tr id="details-${idx}" class="detail-pane">
            <td colspan="5">
                <div class="detail-content">
                    <div class="info-box">
                        <h4>${content.ui_stadium}</h4>
                        <div class="info-text">${city.std}</div>
                    </div>
                    <div class="info-box">
                        <h4>${content.ui_logistics}</h4>
                        <div class="info-text">${city.log}</div>
                    </div>
                </div>
            </td>
        </tr>
    `).join('');

    html = html.replace(/{{tableRows}}/g, rowsHtml);

    const outputDir = path.join(projectSubDir, lang);
    if (!fs.existsSync(outputDir)) fs.mkdirSync(outputDir, { recursive: true });
    fs.writeFileSync(path.join(outputDir, 'index.html'), html);
    console.log(`✅ ${lang} 版生成完毕 (输出至: ${data.siteConfig.basePath}/${lang}/)`);
});

// 生成 sitemap.xml
const sitemap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${data.languages.map(lang => `
  <url>
    <loc>${data.siteConfig.domain}${data.siteConfig.basePath}/${lang}/index.html</loc>
    <lastmod>${new Date().toISOString().split('T')[0]}</lastmod>
    <priority>0.80</priority>
  </url>`).join('')}
</urlset>`;
fs.writeFileSync(path.join(__dirname, 'dist', 'sitemap.xml'), sitemap);
console.log('✅ sitemap.xml 已生成');

// 生成 robots.txt
const robots = `User-agent: *
Allow: /

Sitemap: ${data.siteConfig.domain}${data.siteConfig.basePath}/sitemap.xml
`;
fs.writeFileSync(path.join(__dirname, 'dist', 'robots.txt'), robots);
console.log('✅ robots.txt 已生成');

// 生成根目录首页 (PickBetterAI.com 门面)
const homeHtml = `<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Pick Better AI - Smart Decisions Enhanced by AI</title>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Outfit:wght@700;800&display=swap" rel="stylesheet">
    <style>
        :root {
            --bg: #030712;
            --card-bg: rgba(17, 24, 39, 0.7);
            --accent: #6366f1;
            --text: #f9fafb;
            --text-muted: #9ca3af;
        }
        body {
            font-family: 'Inter', sans-serif;
            background: var(--bg);
            color: var(--text);
            margin: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            background-image: radial-gradient(circle at top right, rgba(99, 102, 241, 0.15), transparent),
                              radial-gradient(circle at bottom left, rgba(168, 85, 247, 0.15), transparent);
        }
        .container {
            max-width: 1000px;
            width: 90%;
            padding: 40px 0;
        }
        header { text-align: center; margin-bottom: 60px; }
        h1 { font-family: 'Outfit', sans-serif; font-size: 48px; margin: 0; background: linear-gradient(to right, #fff, #9ca3af); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        header p { color: var(--text-muted); font-size: 18px; margin-top: 10px; }
        
        .bento-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-gap: 24px;
        }
        .card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 24px;
            padding: 30px;
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s;
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .card:hover { transform: translateY(-5px); border-color: var(--accent); }
        .card.featured { grid-column: span 2; grid-row: span 2; background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1)); border: 1px solid rgba(99, 102, 241, 0.3); }
        .card h2 { font-size: 24px; margin: 0 0 10px 0; font-family: 'Outfit', sans-serif; }
        .card p { color: var(--text-muted); font-size: 14px; line-height: 1.6; margin: 0; }
        .card .icon { font-size: 40px; margin-bottom: 20px; }
        .tag { display: inline-block; padding: 4px 12px; border-radius: 100px; font-size: 10px; font-weight: 700; text-transform: uppercase; background: var(--accent); color: white; margin-bottom: 12px; }
        .tag.soon { background: #374151; color: #9ca3af; }

        @media (max-width: 768px) {
            .bento-grid { grid-template-columns: 1fr; }
            .card.featured { grid-column: span 1; grid-row: span 1; }
            h1 { font-size: 32px; }
        }
    </style>
</head>
<body>
    <div class="container">
        <header>
            <div style="font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 24px; color: var(--accent); margin-bottom: 20px;">PickBetterAI</div>
            <h1>Smart Decisions, Enhanced by AI</h1>
            <p>We help you find the best options in travel, tech, and life.</p>
        </header>

        <div class="bento-grid">
            <a href="${data.siteConfig.basePath}/en/index.html" class="card featured">
                <div class="tag">Active Tool</div>
                <div class="icon">⚽️</div>
                <div>
                    <h2>2026 World Cup City Planner</h2>
                    <p>Compare 16 host cities across USA, Canada, and Mexico. Decide where to watch based on match count, budget, and local logistics. Multi-language support included.</p>
                </div>
            </a>
            
            <div class="card">
                <div class="tag soon">Coming Soon</div>
                <div class="icon">💻</div>
                <h2>AI Tech Selection</h2>
                <p>Picking the right AI model or tool for your specific workflow.</p>
            </div>

            <div class="card">
                <div class="tag soon">Coming Soon</div>
                <div class="icon">✈️</div>
                <h2>Smart Travel</h2>
                <p>Data-driven destination comparison for digital nomads.</p>
            </div>

            <div class="card" style="grid-column: span 3; padding: 20px; text-align: center; background: transparent; border: none;">
                <p>&copy; 2026 PickBetterAI.com | All Rights Reserved</p>
            </div>
        </div>
    </div>
</body>
</html>`;

fs.writeFileSync(path.join(__dirname, 'dist', 'index.html'), homeHtml);
console.log('✅ 根目录首页 index.html 已生成');