import { NextRequest, NextResponse } from 'next/server';
import { getAuth, createUserWithEmailAndPassword, updateProfile } from 'firebase/auth';
import { app } from '@/lib/firebase';

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

    if (!email || !password || !name) {
      return NextResponse.json(
        { error: 'Missing email, password or name' },
        { status: 400 }
      );
    }

    const auth = getAuth(app);

    const userCredential = await createUserWithEmailAndPassword(auth, email, password);

    if (auth.currentUser) {
      await updateProfile(auth.currentUser, { displayName: name });
    }

    const user = userCredential.user;

    // Firebase client SDK already keeps the session via cookies/local storage on client.
    // For MVP, we just return basic user info.
    return NextResponse.json(
      {
        user: {
          uid: user.uid,
          email: user.email,
          name: user.displayName,
        },
      },
      { status: 201 }
    );
  } catch (error: any) {
    console.error('Register error:', error);

    const message =
      error?.code === 'auth/email-already-in-use'
        ? 'Email already in use'
        : 'Registration failed';

    return NextResponse.json({ error: message }, { status: 400 });
  }
}