const fs = require('fs');
const path = require('path');
const matter = require('gray-matter');

const FRIEND_CIRCLE_PATH = path.join(__dirname, '../themes/Ying/static/json/friend_circle_data.json');
const LINK_SUMMARY_PATH = path.join(__dirname, '../failed_links_summary.txt');
const POSTS_DIR = path.join(__dirname, '../content/post');

const BASE_URL = "https://usj.cc";

// Helper to format date as YYYYMMDD
function formatDateYYYYMMDD(date) {
    const y = date.getFullYear();
    const m = String(date.getMonth() + 1).padStart(2, '0');
    const d = String(date.getDate()).padStart(2, '0');
    return `${y}${m}${d}`;
}

// Helper to get latest post from content/post
function getLatestPost() {
    try {
        if (!fs.existsSync(POSTS_DIR)) return null;

        let latestFile = null;
        let latestDate = new Date(0);

        function scanDir(dir) {
            const files = fs.readdirSync(dir);
            for (const file of files) {
                const fullPath = path.join(dir, file);
                const stat = fs.statSync(fullPath);
                if (stat.isDirectory()) {
                    scanDir(fullPath);
                } else if (file.endsWith('.md')) {
                    // Try to read frontmatter date
                    try {
                        const content = fs.readFileSync(fullPath, 'utf8');
                        const parsed = matter(content);
                        if (parsed.data.date) {
                            const date = new Date(parsed.data.date);
                            // Only consider posts that are NOT hidden
                            if (parsed.data.status !== 'hidden' && parsed.data.draft !== true) {
                                if (date > latestDate) {
                                    latestDate = date;
                                    latestFile = {
                                        title: parsed.data.title || file.replace('.md', ''),
                                        date: date,
                                        // Construct URL based on hugo.toml: /:year:month:day.html
                                        url: `${BASE_URL}/${formatDateYYYYMMDD(date)}.html`
                                    };
                                }
                            }
                        }
                    } catch (e) {
                        // Ignore parsing errors
                    }
                }
            }
        }
        
        scanDir(POSTS_DIR);
        return latestFile;
    } catch (e) {
        console.error('Error finding latest post:', e);
        return null;
    }
}

async function main() {
    let report = "";
    
    // 1. 最新文章
    const latestPost = getLatestPost();
    if (latestPost) {
        report += `### 📝 最新文章\n`;
        const dateStr = latestPost.date.toLocaleDateString();
        report += `- [${latestPost.title}](${latestPost.url}) (${dateStr})\n`;
        report += `\n`;
    } else {
        report += `### 📝 最新文章\n(未找到公开文章)\n\n`;
    }

    // 2. 友链检测
    try {
        if (fs.existsSync(LINK_SUMMARY_PATH)) {
            const linkSummary = fs.readFileSync(LINK_SUMMARY_PATH, 'utf8').trim();
            report += `### 🔗 友链检测\n`;
            report += `${linkSummary}\n\n`;
        } else {
            report += `### 🔗 友链检测\n(无检测结果)\n\n`;
        }
    } catch (e) {
         console.error("Error reading link summary:", e);
    }

    // 3. 近三天朋友圈
    try {
        if (fs.existsSync(FRIEND_CIRCLE_PATH)) {
            const data = JSON.parse(fs.readFileSync(FRIEND_CIRCLE_PATH, 'utf8'));
            const threeDaysAgo = new Date();
            threeDaysAgo.setDate(threeDaysAgo.getDate() - 3);

            const recentPosts = data.posts.filter(post => new Date(post.date) > threeDaysAgo);

            report += `### 👥 朋友圈近况 (近3天)\n`;
            if (recentPosts.length > 0) {
                // Limit to top 10 to avoid too long email
                const limitedPosts = recentPosts.slice(0, 10);
                limitedPosts.forEach(post => {
                    const dateStr = new Date(post.date).toLocaleDateString();
                    report += `- [${post.author}] [${post.title}](${post.link}) (${dateStr})\n`;
                });
                if (recentPosts.length > 10) {
                    report += `... 以及其他 ${recentPosts.length - 10} 篇\n`;
                }
            } else {
                report += `无更新\n`;
            }
            report += `\n`;
        }
    } catch (e) {
        console.error("Error reading friend circle data:", e);
    }

    // Output to stdout for debugging
    console.log(report);

    // Output to GITHUB_ENV if running in Actions
    if (process.env.GITHUB_ENV) {
        const delimiter = `EOF_${Math.random().toString(36).substr(2, 9)}`;
        fs.appendFileSync(process.env.GITHUB_ENV, `DEPLOY_REPORT<<${delimiter}\n${report}\n${delimiter}\n`);
    }
}

main();