import { Request } from 'express';

// ---- Error handling ----

export class AppError extends Error {
  statusCode: number;
  code?: string;

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

// ---- API response shape ----

export interface ApiResponse<T = unknown> {
  data: T | null;
  error: string | null;
  meta?: Record<string, unknown>;
}

export function ok<T>(data: T, meta?: Record<string, unknown>): ApiResponse<T> {
  return { data, error: null, ...(meta ? { meta } : {}) };
}

export function err(message: string, meta?: Record<string, unknown>): ApiResponse<null> {
  return { data: null, error: message, ...(meta ? { meta } : {}) };
}

// ---- Augmented request ----

export interface AuthenticatedRequest extends Request {
  user: { sub: string };
}