/**
 * Get User By ID Query Handler
 * Handles retrieval of a specific user by ID
 */
class GetUserByIdQueryHandler {
  constructor(prisma) {
    this.prisma = prisma;
  }

  /**
   * Execute get user by ID query
   * @param {GetUserByIdQuery} query 
   * @returns {Promise<Object>} User data without password
   */
  async handle(query) {
    const { userId } = query;

    if (!userId || isNaN(userId)) {
      throw new Error('Valid user ID is required');
    }

    const user = await this.prisma.user.findUnique({
      where: { id: parseInt(userId) }
    });

    if (!user) {
      throw new Error('User not found');
    }

    const { password, ...userWithoutPassword } = user;
    return userWithoutPassword;
  }
}

module.exports = GetUserByIdQueryHandler;