import { prisma } from "@/lib/prisma";
import { getServerSession } from "next-auth";
import { authOptions } from "@/lib/auth";
import { NextResponse } from "next/server";
import { rewardPoints } from "@/lib/points-reward";

export async function POST(req: Request, { params }: { params: { id: string } }) {
  const session = await getServerSession(authOptions);
  if (!session?.user?.id) {
    return NextResponse.json({ error: "请先登录" }, { status: 401 });
  }

  const userId = parseInt(session.user.id);
  const commentId = parseInt(params.id);

  const [existing] = await prisma.commentLike.findMany({
    where: { commentId, userId },
  });

  if (existing) {
    await prisma.commentLike.delete({
      where: { commentId_userId: { commentId, userId } },
    });

    await prisma.comment.update({
      where: { id: commentId },
      data: { likeCount: { decrement: 1 } },
    });

    return NextResponse.json({ liked: false });
  }

  const result = await prisma.$transaction(async (tx) => {
    await tx.commentLike.create({
      data: { commentId, userId },
    });

    await tx.comment.update({
      where: { id: commentId },
      data: { likeCount: { increment: 1 } },
    });

    const comment = await tx.comment.findUnique({
      where: { id: commentId },
      select: { userId: true },
    });

    if (comment && comment.userId !== userId) {
      await tx.notification.create({
        data: {
          userId: comment.userId,
          type: "COMMENT_LIKE",
          title: `${session.user.name || "用户"} 点赞了你的评论`,
          link: "/notifications",
        },
      });
    }

    return comment;
  });

  if (result) {
    await rewardPoints(result.userId, "comment_like", "评论被点赞", "comment", commentId);
  }

  return NextResponse.json({ liked: true });
}