// 对齐 forumTopic.likeCount / forumPost.likeCount 与真实 Like 表的计数
// 用法：
//   node scripts/reconcile-like-counts.mjs           # 仅巡检
//   node scripts/reconcile-like-counts.mjs --fix     # 巡检 + 自动修正
//   node scripts/reconcile-like-counts.mjs --scope=topic|post|both
//   node scripts/reconcile-like-counts.mjs --bot-only # 只检查 bot 的话题/回复
import { PrismaClient } from "@prisma/client";
import { PrismaMariaDb } from "@prisma/adapter-mariadb";
import "dotenv/config";

const base = process.env.DATABASE_URL.replace("mysql://", "mariadb://");
const sep = base.includes("?") ? "&" : "?";
const connectionString = `${base}${sep}connection_limit=5&pool_timeout=15`;
const adapter = new PrismaMariaDb(connectionString);
const prisma = new PrismaClient({ adapter });

const args = process.argv.slice(2);
const fixMode = args.includes("--fix");
const botOnly = args.includes("--bot-only");
const scopeArg = args.find((a) => a.startsWith("--scope="));
const scope = scopeArg ? scopeArg.split("=")[1] : "both";
const limitArg = args.find((a) => a.startsWith("--limit="));
const limit = limitArg ? parseInt(limitArg.split("=")[1], 10) : 5000;

function ts() {
  return `[${new Date().toISOString()}]`;
}

async function reconcileTopics() {
  console.log(`\n${ts()} 巡检 forumTopic.likeCount ...`);
  const where = {};
  if (botOnly) where.user = { isBot: true };
  const all = await prisma.forumTopic.findMany({
    where,
    select: { id: true, likeCount: true, userId: true },
    take: limit,
  });
  console.log(`  范围: ${all.length} 个 topic${botOnly ? " (bot 限定)" : ""}`);

  // 批量统计真实点赞数（按 topicId groupBy）
  const topicIds = all.map((t) => t.id);
  if (topicIds.length === 0) return { drift: 0, fixed: 0 };

  const realCounts = await prisma.forumTopicLike.groupBy({
    by: ["topicId"],
    where: { topicId: { in: topicIds } },
    _count: { _all: true },
  });
  const realMap = new Map(realCounts.map((r) => [r.topicId, r._count._all]));

  let drift = 0;
  let fixed = 0;
  const samples = [];
  for (const t of all) {
    const real = realMap.get(t.id) || 0;
    if (real !== t.likeCount) {
      drift++;
      if (samples.length < 8) {
        samples.push({ id: t.id, stored: t.likeCount, real });
      }
      if (fixMode) {
        await prisma.forumTopic.update({
          where: { id: t.id },
          data: { likeCount: real },
        });
        fixed++;
      }
    }
  }
  console.log(`  偏差: ${drift}${fixMode ? `，已修正 ${fixed}` : ""}`);
  if (samples.length > 0) {
    console.log(`  示例（最多 8 条）:`);
    for (const s of samples) {
      console.log(`    topic ${s.id}: stored=${s.stored} 实际=${s.real}`);
    }
  }
  return { drift, fixed };
}

async function reconcilePosts() {
  console.log(`\n${ts()} 巡检 forumPost.likeCount ...`);
  const where = {};
  if (botOnly) where.user = { isBot: true };
  const all = await prisma.forumPost.findMany({
    where,
    select: { id: true, likeCount: true, userId: true },
    take: limit,
  });
  console.log(`  范围: ${all.length} 个 post${botOnly ? " (bot 限定)" : ""}`);

  const postIds = all.map((p) => p.id);
  if (postIds.length === 0) return { drift: 0, fixed: 0 };

  const realCounts = await prisma.forumPostLike.groupBy({
    by: ["postId"],
    where: { postId: { in: postIds } },
    _count: { _all: true },
  });
  const realMap = new Map(realCounts.map((r) => [r.postId, r._count._all]));

  let drift = 0;
  let fixed = 0;
  const samples = [];
  for (const p of all) {
    const real = realMap.get(p.id) || 0;
    if (real !== p.likeCount) {
      drift++;
      if (samples.length < 8) {
        samples.push({ id: p.id, stored: p.likeCount, real });
      }
      if (fixMode) {
        await prisma.forumPost.update({
          where: { id: p.id },
          data: { likeCount: real },
        });
        fixed++;
      }
    }
  }
  console.log(`  偏差: ${drift}${fixMode ? `，已修正 ${fixed}` : ""}`);
  if (samples.length > 0) {
    console.log(`  示例（最多 8 条）:`);
    for (const s of samples) {
      console.log(`    post ${s.id}: stored=${s.stored} 实际=${s.real}`);
    }
  }
  return { drift, fixed };
}

async function main() {
  console.log(`========== 点赞数对齐巡检 ==========`);
  console.log(`模式: ${fixMode ? "FIX（自动修正）" : "CHECK（仅巡检）"}`);
  console.log(`范围: ${scope}${botOnly ? " (仅 bot)" : ""}`);
  console.log(`扫描上限: ${limit}`);

  const summary = { topic: { drift: 0, fixed: 0 }, post: { drift: 0, fixed: 0 } };
  if (scope === "topic" || scope === "both") {
    summary.topic = await reconcileTopics();
  }
  if (scope === "post" || scope === "both") {
    summary.post = await reconcilePosts();
  }

  console.log(`\n========== 总结 ==========`);
  console.log(`话题偏差: ${summary.topic.drift}${fixMode ? `（已修正 ${summary.topic.fixed}）` : ""}`);
  console.log(`回复偏差: ${summary.post.drift}${fixMode ? `（已修正 ${summary.post.fixed}）` : ""}`);
  const totalDrift = summary.topic.drift + summary.post.drift;
  if (totalDrift === 0) {
    console.log(`\n✅ 全部对齐，无需修正`);
  } else if (fixMode) {
    console.log(`\n🔧 已完成修正`);
  } else {
    console.log(`\n⚠️  发现偏差，加 --fix 自动修正`);
  }

  await prisma.$disconnect();
}

main().catch(async (e) => {
  console.error(e);
  await prisma.$disconnect();
  process.exit(1);
});