/**
 * newsletter-generate.mjs
 * 每周一生成追光AI Newsletter
 *
 * 功能:
 *  1. 获取近14天热门工具（按浏览数排序）
 *  2. 获取近7天GitHub星值增长最多的技能
 *  3. 获取近7天最活跃的社区话题
 *  4. 生成 JSON + HTML 两个版本的输出
 *  5. 输出到 public/newsletter/
 *
 * 调度: 每周一上午 10:00 (crontab: 0 10 * * 1)
 */

import { PrismaClient } from "@prisma/client";
import { PrismaMariaDb } from "@prisma/adapter-mariadb";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";
import "dotenv/config";

// ─── Prisma 初始化 ────────────────────────────────────────────
const rawUrl = process.env.DATABASE_URL;
if (!rawUrl) {
  console.error("DATABASE_URL not set");
  process.exit(1);
}
const base = rawUrl.replace("mysql://", "mariadb://");
const sep = base.includes("?") ? "&" : "?";
const connectionString = `${base}${sep}connection_limit=20&pool_timeout=30`;
const adapter = new PrismaMariaDb(connectionString);
const prisma = new PrismaClient({ adapter });

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// ─── 工具函数 ─────────────────────────────────────────────────

function getWeekStart() {
  const now = new Date();
  const day = now.getDay();
  const diff = now.getDate() - day + (day === 0 ? -6 : 1);
  const monday = new Date(now.getFullYear(), now.getMonth(), diff);
  monday.setHours(0, 0, 0, 0);
  return monday;
}

function formatDate(date) {
  const d = new Date(date);
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
}

function formatNumber(n) {
  if (n >= 10000) return `${(n / 10000).toFixed(1)}万`;
  if (n >= 1000) return `${(n / 1000).toFixed(1)}k`;
  return String(n);
}

async function main() {
  const startTime = new Date();
  const now = new Date();
  const weekStart = getWeekStart();
  const twoWeeksAgo = new Date(now.getTime() - 14 * 24 * 60 * 60 * 1000);

  console.log(`📰 [Newsletter] 开始生成 ${formatDate(startTime)} 的 Newsletter...`);

  // ── 1. 热门工具 ─────────────────────────────────────────────
  const hotTools = await prisma.tool.findMany({
    where: {
      status: "published",
      createdAt: { gte: twoWeeksAgo },
    },
    select: {
      id: true,
      name: true,
      slug: true,
      description: true,
      logoUrl: true,
      viewCount: true,
      avgRating: true,
      category: { select: { name: true, slug: true } },
    },
    orderBy: { viewCount: "desc" },
    take: 5,
  });

  // ── 2. 热门技能（本周星值增长）──────────────────────────────
  const hotSkills = await prisma.skill.findMany({
    where: {
      status: "published",
      starsChangeWeek: { gt: 0 },
    },
    select: {
      id: true,
      name: true,
      slug: true,
      description: true,
      logoUrl: true,
      githubStars: true,
      starsChangeWeek: true,
      sourceUrl: true,
      sourceType: true,
      category: { select: { name: true, slug: true } },
    },
    orderBy: { starsChangeWeek: "desc" },
    take: 3,
  });

  // ── 3. 热门话题 ─────────────────────────────────────────────
  const hotTopics = await prisma.forumTopic.findMany({
    where: {
      isHidden: false,
      createdAt: { gte: weekStart },
    },
    select: {
      id: true,
      title: true,
      slug: true,
      replyCount: true,
      likeCount: true,
      viewCount: true,
      category: { select: { name: true, slug: true } },
    },
    orderBy: { replyCount: "desc" },
    take: 3,
  });

  // ── 4. 本周期数 ────────────────────────────────────────────
  const issueNumber = Math.floor(
    (now.getTime() - new Date("2025-01-01").getTime()) / (7 * 24 * 60 * 60 * 1000)
  );

  // ── 5. 构建 Newsletter 数据 ─────────────────────────────────
  const newsletter = {
    issue: issueNumber,
    date: formatDate(now),
    weekStart: formatDate(weekStart),
    weekEnd: formatDate(now),
    summary: `本周推荐 ${hotTools.length} 款热门AI工具、${hotSkills.length} 个上升技能、${hotTopics.length} 个社区热帖`,
    sections: {
      hotTools: hotTools.map((t) => ({
        name: t.name,
        slug: t.slug,
        description: t.description?.substring(0, 120) || "",
        logoUrl: t.logoUrl,
        viewCount: formatNumber(t.viewCount),
        rating: t.avgRating?.toFixed(1) || "0.0",
        category: t.category?.name || "未分类",
      })),
      hotSkills: hotSkills.map((s) => ({
        name: s.name,
        slug: s.slug,
        description: s.description?.substring(0, 120) || "",
        logoUrl: s.logoUrl,
        githubStars: formatNumber(s.githubStars),
        starsChange: `+${s.starsChangeWeek}`,
        sourceUrl: s.sourceUrl,
        sourceType: s.sourceType,
        category: s.category?.name || "未分类",
      })),
      hotTopics: hotTopics.map((t) => ({
        title: t.title,
        slug: t.slug,
        replyCount: t.replyCount,
        likeCount: t.likeCount,
        viewCount: formatNumber(t.viewCount),
        category: t.category?.name || "综合",
      })),
    },
    generatedAt: now.toISOString(),
  };

  // ── 6. 写入文件 ─────────────────────────────────────────────
  const outDir = path.join(__dirname, "..", "public", "newsletter");
  fs.mkdirSync(outDir, { recursive: true });

  // JSON 输出
  const jsonPath = path.join(outDir, "latest.json");
  fs.writeFileSync(jsonPath, JSON.stringify(newsletter, null, 2), "utf-8");
  console.log(`  ✅ JSON 已写入: ${jsonPath}`);

  // HTML 输出
  const html = buildHtml(newsletter);
  const htmlPath = path.join(outDir, "latest.html");
  fs.writeFileSync(htmlPath, html, "utf-8");
  console.log(`  ✅ HTML 已写入: ${htmlPath}`);

  // 归档 JSON（按日期）
  const archiveDir = path.join(outDir, "archive");
  fs.mkdirSync(archiveDir, { recursive: true });
  const archivePath = path.join(archiveDir, `${formatDate(now)}.json`);
  fs.writeFileSync(archivePath, JSON.stringify(newsletter, null, 2), "utf-8");

  const elapsed = Date.now() - startTime.getTime();
  console.log(`✅ [Newsletter] 第 ${issueNumber} 期生成完成，耗时 ${elapsed}ms`);
  await prisma.$disconnect();
}

function buildHtml(n) {
  const toolsHtml = n.sections.hotTools
    .map(
      (t) => `
      <div style="border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin-bottom:12px;">
        <div style="display:flex;align-items:center;gap:12px;">
          ${t.logoUrl ? `<img src="${t.logoUrl}" alt="${t.name}" width="48" height="48" style="border-radius:10px;object-fit:contain;border:1px solid #e5e7eb;">` : ""}
          <div>
            <a href="https://www.zhuig.com/tools/${t.slug}" style="font-size:16px;font-weight:600;color:#7c3aed;text-decoration:none;">${t.name}</a>
            <span style="margin-left:8px;font-size:12px;color:#6b7280;background:#f3f4f6;padding:2px 8px;border-radius:6px;">${t.category}</span>
            <p style="margin:4px 0 0;font-size:13px;color:#6b7280;">${t.description}</p>
            <span style="font-size:12px;color:#9ca3af;">👁 ${t.viewCount} 浏览 · ⭐ ${t.rating}</span>
          </div>
        </div>
      </div>`
    )
    .join("");

  const skillsHtml = n.sections.hotSkills
    .map(
      (s) => `
      <div style="border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin-bottom:12px;">
        <div style="display:flex;align-items:center;gap:12px;">
          ${s.logoUrl ? `<img src="${s.logoUrl}" alt="${s.name}" width="48" height="48" style="border-radius:10px;object-fit:contain;border:1px solid #e5e7eb;">` : ""}
          <div>
            <a href="https://www.zhuig.com/skills/${s.slug}" style="font-size:16px;font-weight:600;color:#7c3aed;text-decoration:none;">${s.name}</a>
            <span style="margin-left:8px;font-size:12px;color:#6b7280;background:#f3f4f6;padding:2px 8px;border-radius:6px;">${s.category}</span>
            <p style="margin:4px 0 0;font-size:13px;color:#6b7280;">${s.description}</p>
            <span style="font-size:12px;color:#9ca3af;">⭐ ${s.githubStars} · 📈 ${s.starsChange} 本周</span>
          </div>
        </div>
      </div>`
    )
    .join("");

  const topicsHtml = n.sections.hotTopics
    .map(
      (t) => `
      <div style="border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin-bottom:12px;">
        <a href="https://www.zhuig.com/forum/${t.slug}" style="font-size:16px;font-weight:600;color:#7c3aed;text-decoration:none;">${t.title}</a>
        <span style="margin-left:8px;font-size:12px;color:#6b7280;background:#f3f4f6;padding:2px 8px;border-radius:6px;">${t.category}</span>
        <div style="margin-top:4px;font-size:12px;color:#9ca3af;">
          💬 ${t.replyCount} 回复 · 👍 ${t.likeCount} 赞 · 👁 ${t.viewCount} 浏览
        </div>
      </div>`
    )
    .join("");

  return `<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>追光AI 周刊 #${n.issue} - ${n.date}</title>
</head>
<body style="margin:0;padding:0;background:#f9fafb;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
  <table width="100%" cellpadding="0" cellspacing="0" style="max-width:640px;margin:0 auto;background:#fff;">
    <tr>
      <td style="padding:40px 32px 24px;text-align:center;background:linear-gradient(135deg,#7c3aed,#a855f7);">
        <h1 style="color:#fff;margin:0;font-size:28px;">🔦 追光AI 周刊</h1>
        <p style="color:rgba(255,255,255,0.85);margin:8px 0 0;font-size:14px;">第 ${n.issue} 期 · ${n.weekStart} ~ ${n.weekEnd}</p>
      </td>
    </tr>
    <tr>
      <td style="padding:24px 32px;">
        <p style="color:#4b5563;font-size:15px;line-height:1.6;margin:0;">${n.summary}</p>
      </td>
    </tr>
    ${toolsHtml ? `
    <tr>
      <td style="padding:0 32px 24px;">
        <h2 style="color:#1f2937;font-size:20px;margin:0 0 16px;">🔥 本周热门工具</h2>
        ${toolsHtml}
      </td>
    </tr>` : ""}
    ${skillsHtml ? `
    <tr>
      <td style="padding:0 32px 24px;">
        <h2 style="color:#1f2937;font-size:20px;margin:0 0 16px;">📈 技能上升榜</h2>
        ${skillsHtml}
      </td>
    </tr>` : ""}
    ${topicsHtml ? `
    <tr>
      <td style="padding:0 32px 24px;">
        <h2 style="color:#1f2937;font-size:20px;margin:0 0 16px;">💡 社区热帖</h2>
        ${topicsHtml}
      </td>
    </tr>` : ""}
    <tr>
      <td style="padding:24px 32px;text-align:center;border-top:1px solid #e5e7eb;">
        <p style="color:#9ca3af;font-size:12px;margin:0;">
          <a href="https://www.zhuig.com/newsletter" style="color:#7c3aed;text-decoration:none;">查看往期周刊</a> · 
          <a href="https://www.zhuig.com" style="color:#7c3aed;text-decoration:none;">追光AI</a>
        </p>
        <p style="color:#d1d5db;font-size:11px;margin:4px 0 0;">由追光AI自动生成于 ${n.generatedAt}</p>
      </td>
    </tr>
  </table>
</body>
</html>`;
}

main().catch((err) => {
  console.error("❌ [Newsletter] 生成失败:", err);
  process.exit(1);
});