#!/usr/bin/env bun
/**
 * GitHub Trending Dashboard Generator
 *
 * 生成交互式数据可视化仪表板
 *
 * 使用方式：
 *   ./GenerateDashboard.ts [options]
 *
 * 选项：
 *   --period       - daily | weekly (默认: weekly)
 *   --language     - 编程语言筛选 (可选)
 *   --limit        - 项目数量 (默认: 10)
 *   --include-news - 包含技术新闻
 *   --news-count   - 新闻数量 (默认: 10)
 *   --theme        - light | dark | auto (默认: auto)
 *   --output       - 输出文件路径 (默认: ./github-trends.html)
 *
 * 示例：
 *   ./GenerateDashboard.ts
 *   ./GenerateDashboard.ts --period daily --language TypeScript --include-news
 *   ./GenerateDashboard.ts --limit 20 --output ~/trends.html
 */

import Handlebars from 'handlebars';
import type { DashboardOptions, TrendingProject, TechNewsItem, TemplateData } from './Lib/types';
import { registerHelpers, renderTemplate } from './Lib/template-helpers';
import { analyzeData } from './Lib/visualization-helpers';

// 注册 Handlebars 辅助函数
registerHelpers();

/**
 * 构建 GitHub trending URL
 */
function buildTrendingUrl(options: DashboardOptions): string {
  const baseUrl = "https://github.com/trending";
  const since = options.period === "daily" ? "daily" : "weekly";
  let url = `${baseUrl}?since=${since}`;

  if (options.language) {
    url += `&language=${encodeURIComponent(options.language.toLowerCase())}`;
  }

  return url;
}

/**
 * 解析 HTML 提取 trending 项目
 * （从 GetTrending.ts 复制的逻辑）
 */
async function getTrendingProjects(options: DashboardOptions): Promise<TrendingProject[]> {
  const url = buildTrendingUrl(options);

  console.error(`正在获取 GitHub trending 数据: ${url}`);

  const response = await fetch(url);
  if (!response.ok) {
    throw new Error(`HTTP ${response.status}: ${response.statusText}`);
  }

  const html = await response.text();
  return parseTrendingProjects(html, options.limit);
}

/**
 * 解析 HTML
 */
function parseTrendingProjects(html: string, limit: number): TrendingProject[] {
  const projects: TrendingProject[] = [];

  try {
    const articleRegex = /<article[^>]*>([\s\S]*?)<\/article>/g;
    const articles = html.match(articleRegex) || [];
    const articlesToProcess = articles.slice(0, limit);

    articlesToProcess.forEach((article, index) => {
      try {
        const headingMatch = article.match(/<h[12][^>]*>([\s\S]*?)<\/h[12]>/);
        let repoName: string | null = null;

        if (headingMatch) {
          const headingContent = headingMatch[1];
          const validLinkMatch = headingContent.match(
            /<a[^>]*href="\/([^\/"\/]+\/[^\/"\/]+)"[^>]*>(?![^<]*login)/
          );
          if (validLinkMatch) {
            repoName = validLinkMatch[1];
          }
        }

        if (!repoName) {
          const repoMatch = article.match(
            /<a[^>]*href="\/([a-zA-Z0-9_.-]+\/[a-zA-Z0-9_.-]+)"[^>]*>(?!.*(?:login|stargazers|forks|issues))/
          );
          repoName = repoMatch ? repoMatch[1] : null;
        }

        const descMatch = article.match(/<p[^>]*class="[^"]*col-9[^"]*"[^>]*>([\s\S]*?)<\/p>/);
        const description = descMatch
          ? descMatch[1]
              .replace(/<[^>]+>/g, "")
              .replace(/&amp;/g, "&")
              .replace(/&lt;/g, "<")
              .replace(/&gt;/g, ">")
              .replace(/&quot;/g, '"')
              .trim()
              .substring(0, 200)
          : "No description";

        const langMatch = article.match(/<span[^>]*itemprop="programmingLanguage"[^>]*>([^<]+)<\/span>/);
        const language = langMatch ? langMatch[1].trim() : "Unknown";

        // 提取stars总数 - GitHub 改了 HTML 结构，数字在 SVG 后面
        const starsMatch = article.match(/stargazers[^>]*>[\s\S]*?<\/svg>\s*([\d,]+)/);
        const totalStars = starsMatch ? starsMatch[1] : "0";

        // 尝试提取新增stars - 格式：XXX stars today/this week
        const starsAddedMatch = article.match(/(\d[\d,]*)\s+stars?\s+(?:today|this week)/);
        const starsAdded = starsAddedMatch ? `+${starsAddedMatch[1]}` : "";

        if (repoName && !repoName.includes("login") && !repoName.includes("return_to")) {
          projects.push({
            rank: index + 1,
            name: repoName,
            description,
            language,
            stars: totalStars,
            starsThisPeriod: starsAdded,
            url: `https://github.com/${repoName}`,
          });
        }
      } catch (error) {
        console.error(`解析第${index + 1}个项目失败:`, error);
      }
    });
  } catch (error) {
    console.error("解析trending项目失败:", error);
  }

  return projects;
}

/**
 * 获取技术新闻
 */
async function getTechNews(count: number): Promise<TechNewsItem[]> {
  const HN_API = 'https://hn.algolia.com/api/v1/search_by_date';

  try {
    const response = await fetch(`${HN_API}?tags=story&hitsPerPage=${count}`);
    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    }

    const data = await response.json();

    return data.hits.slice(0, count).map((hit: any) => ({
      id: hit.objectID,
      title: hit.title,
      url: hit.url || `https://news.ycombinator.com/item?id=${hit.objectID}`,
      source: 'hackernews',
      points: hit.points || 0,
      comments: hit.num_comments || 0,
      timestamp: new Date(hit.created_at).toISOString(),
      tags: hit._tags || []
    }));
  } catch (error) {
    console.error('获取 Hacker News 失败:', error);
    return [];
  }
}

/**
 * 生成仪表板
 */
async function generateDashboard(options: DashboardOptions): Promise<void> {
  try {
    console.error('🚀 开始生成 GitHub Trending Dashboard...\n');

    // 1. 获取 GitHub Trending 数据
    const projects = await getTrendingProjects(options);
    console.error(`✅ 获取到 ${projects.length} 个项目`);

    // 2. 获取技术新闻（如果启用）
    let news: TechNewsItem[] = [];
    if (options.includeNews) {
      news = await getTechNews(options.newsCount);
      console.error(`✅ 获取到 ${news.length} 条新闻`);
    }

    // 3. 分析数据
    const analytics = analyzeData(projects);
    console.error(`✅ 数据分析完成`);

    // 4. 准备模板数据
    const templateData: TemplateData = {
      title: 'GitHub Trending Dashboard',
      generatedAt: new Date().toLocaleString('zh-CN'),
      period: options.period === 'daily' ? 'Daily' : 'Weekly',
      projects,
      news,
      analytics,
      options
    };

    // 5. 渲染模板
    const templatePath = `${import.meta.dir}/../Templates/dashboard.hbs`;
    const templateContent = await Bun.file(templatePath).text();
    const template = Handlebars.compile(templateContent);
    const html = template(templateData);
    console.error(`✅ 模板渲染完成`);

    // 6. 保存文件
    await Bun.write(options.output, html);
    console.error(`\n🎉 仪表板生成成功！`);
    console.error(`📄 文件路径: ${options.output}`);
    console.error(`\n💡 在浏览器中打开查看效果！`);

  } catch (error) {
    console.error('\n❌ 生成仪表板失败:');
    console.error(error);
    process.exit(1);
  }
}

/**
 * 解析命令行参数
 */
function parseArgs(): DashboardOptions {
  const args = process.argv.slice(2);

  const options: DashboardOptions = {
    period: 'weekly',
    limit: 10,
    output: './github-trends.html',
    includeNews: false,
    newsCount: 10,
    theme: 'auto'
  };

  for (let i = 0; i < args.length; i++) {
    const arg = args[i];

    switch (arg) {
      case '--period':
        options.period = args[++i] === 'daily' ? 'daily' : 'weekly';
        break;
      case '--language':
        options.language = args[++i];
        break;
      case '--limit':
        options.limit = parseInt(args[++i]) || 10;
        break;
      case '--include-news':
        options.includeNews = true;
        break;
      case '--news-count':
        options.newsCount = parseInt(args[++i]) || 10;
        break;
      case '--theme':
        options.theme = args[++i] === 'light' || args[++i] === 'dark' ? args[i] : 'auto';
        break;
      case '--output':
        options.output = args[++i];
        break;
      default:
        if (arg.startsWith('--output=')) {
          options.output = arg.split('=')[1];
        } else if (arg.startsWith('--language=')) {
          options.language = arg.split('=')[1];
        } else if (arg.startsWith('--limit=')) {
          options.limit = parseInt(arg.split('=')[1]) || 10;
        }
    }
  }

  return options;
}

/**
 * 主函数
 */
async function main() {
  const options = parseArgs();
  await generateDashboard(options);
}

// 如果直接运行此脚本
if (import.meta.main) {
  main();
}

// 导出供其他模块使用
export { generateDashboard };
export type { DashboardOptions };