import { NextResponse } from 'next/server';
import supabase from '@/lib/db';
import bcrypt from 'bcryptjs';

export async function POST(request: Request) {
  try {
    const { nip, password } = await request.json();

    // Validate input
    if (!nip || !password) {
      return NextResponse.json(
        { error: 'NIP dan password harus diisi' },
        { status: 400 }
      );
    }

    // Validate password length
    if (password.length < 6) {
      return NextResponse.json(
        { error: 'Password minimal 6 karakter' },
        { status: 400 }
      );
    }

    // Check if NIP already exists in user_app table
    const { data: existingUsers, error: userError } = await supabase
      .from('user_app')
      .select('nip')
      .eq('nip', nip)
      .single();

    if (!userError && existingUsers) {
      return NextResponse.json(
        { error: 'NIP sudah terdaftar sebagai pengguna' },
        { status: 400 }
      );
    }

    // Hash password
    const hashedPassword = await bcrypt.hash(password, 10);

    // Insert new user with default role 'dosen'
    const { data: newUser, error: insertError } = await supabase
      .from('user_app')
      .insert({
        nip: nip,
        password: hashedPassword,
        role_user: 'dosen' // Default role for registration
      })
      .select()
      .single();

    if (insertError) {
      console.error('Insert error:', insertError);
      return NextResponse.json(
        { error: 'Terjadi kesalahan saat registrasi' },
        { status: 500 }
      );
    }

    return NextResponse.json(
      { message: 'Registrasi berhasil' },
      { status: 201 }
    );
  } catch (error) {
    console.error('Registration error:', error);
    return NextResponse.json(
      { error: 'Terjadi kesalahan saat registrasi' },
      { status: 500 }
    );
  }
}