export class AppError extends Error {
  public readonly statusCode: number;

  constructor(message: string, statusCode: number) {
    super(message);
    this.name = this.constructor.name;
    this.statusCode = statusCode;
  }
}

export class ValidationError extends AppError {
  constructor(message = 'Validation failed') {
    super(message, 400);
  }
}

export class UnauthorizedError extends AppError {
  constructor(message = 'Authentication required') {
    super(message, 401);
  }
}

export class ForbiddenError extends AppError {
  constructor(message = 'Insufficient permissions') {
    super(message, 403);
  }
}

export class NotFoundError extends AppError {
  constructor(message = 'Resource not found') {
    super(message, 404);
  }
}

export class ConflictError extends AppError {
  constructor(message = 'Resource already exists') {
    super(message, 409);
  }
}