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

export async function GET(
  _request: 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 collectionId = parseInt(params.id);
  const userId = parseInt(session.user.id);

  const collection = await prisma.collection.findUnique({
    where: { id: collectionId },
    include: { _count: { select: { items: true } } },
  });

  if (!collection || collection.userId !== userId) {
    return NextResponse.json({ error: "收藏夹不存在或无权限" }, { status: 403 });
  }

  return NextResponse.json(collection);
}

export async function PUT(
  request: 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 collectionId = parseInt(params.id);
  const userId = parseInt(session.user.id);

  const existing = await prisma.collection.findUnique({
    where: { id: collectionId },
  });

  if (!existing || existing.userId !== userId) {
    return NextResponse.json({ error: "收藏夹不存在或无权限" }, { status: 403 });
  }

  const body = await request.json();
  const { name, description } = body;

  const data: any = {};
  if (name !== undefined) {
    if (!name.trim()) {
      return NextResponse.json({ error: "名称不能为空" }, { status: 400 });
    }
    if (name.trim().length > 50) {
      return NextResponse.json({ error: "名称不能超过50个字符" }, { status: 400 });
    }
    data.name = name.trim();
  }
  if (description !== undefined) {
    data.description = description?.trim() || null;
  }

  const collection = await prisma.collection.update({
    where: { id: collectionId },
    data,
  });

  return NextResponse.json(collection);
}

export async function DELETE(
  _request: 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 collectionId = parseInt(params.id);
  const userId = parseInt(session.user.id);

  const existing = await prisma.collection.findUnique({
    where: { id: collectionId },
  });

  if (!existing || existing.userId !== userId) {
    return NextResponse.json({ error: "收藏夹不存在或无权限" }, { status: 403 });
  }

  await prisma.collection.delete({
    where: { id: collectionId },
  });

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