import { NextRequest, NextResponse } from 'next/server';
import bcrypt from 'bcryptjs';
import { SignJWT } from 'jose';
import { prisma } from '@/lib/prisma';

const JWT_SECRET = new TextEncoder().encode(
  process.env.JWT_SECRET || 'your-secret-key-at-least-32-chars-long'
);

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

    if (!username || !password) {
      return NextResponse.json({ error: 'Username and password are required' }, { status: 400 });
    }

    const user = await prisma.user.findUnique({
      where: { username },
    });

    if (!user) {
      return NextResponse.json({ error: 'Invalid credentials' }, { status: 401 });
    }

    const isPasswordValid = await bcrypt.compare(password, user.password);

    if (!isPasswordValid) {
      return NextResponse.json({ error: 'Invalid credentials' }, { status: 401 });
    }

    const token = await new SignJWT({ userId: user.id, username: user.username })
      .setProtectedHeader({ alg: 'HS256' })
      .setIssuedAt()
      .setExpirationTime('30d')
      .sign(JWT_SECRET);

    const response = NextResponse.json({ message: 'Login successful' }, { status: 200 });

    response.cookies.set('token', token, {
      httpOnly: true,
      secure: process.env.NODE_ENV === 'production',
      sameSite: 'strict',
      maxAge: 30 * 24 * 60 * 60, // 30 days
      path: '/',
    });

    return response;
  } catch (error) {
    console.error('Login error:', error);
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
  }
}