import bcrypt from 'bcryptjs';
import { prisma } from './prisma';
import { cookies } from 'next/headers';

export async function hashPassword(password: string): Promise<string> {
  return bcrypt.hash(password, 10);
}

export async function verifyPassword(password: string, hashedPassword: string): Promise<boolean> {
  return bcrypt.compare(password, hashedPassword);
}

export async function createUser(email: string, password: string, name?: string) {
  const hashedPassword = await hashPassword(password);
  return prisma.user.create({
    data: {
      email,
      password: hashedPassword,
      name,
    },
  });
}

export async function getUserByEmail(email: string) {
  return prisma.user.findUnique({
    where: { email },
  });
}

export async function login(email: string, password: string) {
  const user = await getUserByEmail(email);
  if (!user) {
    return null;
  }

  const isValid = await verifyPassword(password, user.password);
  if (!isValid) {
    return null;
  }

  return user;
}

export async function getCurrentUser() {
  const cookieStore = await cookies();
  const userId = cookieStore.get('user_id')?.value;
  
  if (!userId) {
    return null;
  }

  return prisma.user.findUnique({
    where: { id: userId },
    select: {
      id: true,
      email: true,
      name: true,
      photoUrl: true,
    },
  });
}

export async function setSession(userId: string) {
  const cookieStore = await cookies();
  cookieStore.set('user_id', userId, {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: 60 * 60 * 24 * 7, // 7 days
  });
}

export async function clearSession() {
  const cookieStore = await cookies();
  cookieStore.delete('user_id');
}