import { NextRequest, NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/lib/auth';
import { prisma } from '@/lib/prisma';

// POST - 点赞/取消点赞
export async function POST(request: NextRequest) {
  try {
    const session = await getServerSession(authOptions);

    if (!session?.user) {
      return NextResponse.json({ error: '请先登录' }, { status: 401 });
    }

    const { materialId } = await request.json();

    if (!materialId) {
      return NextResponse.json({ error: '缺少素材ID' }, { status: 400 });
    }

    const userId = (session.user as any).id;

    // 检查是否已点赞
    const existingLike = await prisma.materialLike.findFirst({
      where: {
        materialId,
        userId,
      },
    });

    if (existingLike) {
      // R46修复：使用事务保护取消点赞操作，确保原子性
      await prisma.$transaction(async (tx) => {
        // 删除点赞记录
        await tx.materialLike.delete({
          where: { id: existingLike.id },
        });

        // 减少点赞计数
        await tx.material.update({
          where: { id: materialId },
          data: { likeCount: { decrement: 1 } },
        });
      });

      return NextResponse.json({
        liked: false,
        message: '已取消点赞',
      });
    } else {
      // R46修复：使用事务保护点赞操作，确保原子性
      await prisma.$transaction(async (tx) => {
        // 创建点赞记录
        await tx.materialLike.create({
          data: {
            materialId,
            userId,
          },
        });

        // 增加点赞计数
        await tx.material.update({
          where: { id: materialId },
          data: { likeCount: { increment: 1 } },
        });
      });

      return NextResponse.json({
        liked: true,
        message: '点赞成功',
      });
    }
  } catch (error) {
    console.error('Like error:', error);
    return NextResponse.json({ error: '操作失败' }, { status: 500 });
  }
}