import { NextRequest, NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';

// GET: 사용자 목록 조회 (강사 목록 포함)
export async function GET(request: NextRequest) {
  try {
    const searchParams = request.nextUrl.searchParams;
    const role = searchParams.get('role'); // 'INSTRUCTOR', 'ADMIN', 'STUDENT' 등
    const page = parseInt(searchParams.get('page') || '1');
    const limit = parseInt(searchParams.get('limit') || '100');
    const skip = (page - 1) * limit;

    const where = role ? { role: role as any } : {};

    const [users, total] = await Promise.all([
      prisma.user.findMany({
        where,
        skip,
        take: limit,
        orderBy: {
          createdAt: 'desc',
        },
        select: {
          id: true,
          email: true,
          name: true,
          role: true,
          isActive: true,
          createdAt: true,
        },
      }),
      prisma.user.count({ where }),
    ]);

    return NextResponse.json({
      data: users.map((user) => ({
        id: user.id,
        email: user.email,
        name: user.name,
        role: user.role,
        isActive: user.isActive,
        createdAt: user.createdAt.toISOString().split('T')[0],
      })),
      pagination: {
        page,
        limit,
        total,
        totalPages: Math.ceil(total / limit),
      },
    });
  } catch (error) {
    console.error('Error fetching users:', error);
    return NextResponse.json(
      { error: '사용자 목록을 불러오는 중 오류가 발생했습니다.' },
      { status: 500 }
    );
  }
}