export class ApiError extends Error {
  statusCode: number;
  code: string;
  details?: unknown;

  constructor(statusCode: number, code: string, message: string, details?: unknown) {
    super(message);
    this.name = "ApiError";
    this.statusCode = statusCode;
    this.code = code;
    this.details = details;
  }
}

export function badRequest(code: string, message: string, details?: unknown) {
  return new ApiError(400, code, message, details);
}

export function unauthorized(code: string, message: string, details?: unknown) {
  return new ApiError(401, code, message, details);
}

export function forbidden(code: string, message: string, details?: unknown) {
  return new ApiError(403, code, message, details);
}

export function notFound(code: string, message: string, details?: unknown) {
  return new ApiError(404, code, message, details);
}

export function conflict(code: string, message: string, details?: unknown) {
  return new ApiError(409, code, message, details);
}

export function toErrorBody(err: unknown, requestId: string) {
  if (err instanceof ApiError) {
    return {
      statusCode: err.statusCode,
      body: {
        ok: false,
        code: err.code,
        message: err.message,
        requestId,
        ...(err.details !== undefined ? { details: err.details } : {}),
      },
    };
  }

  const fallback = err as { statusCode?: number; code?: string; message?: string };
  const statusCode =
    typeof fallback?.statusCode === "number" ? fallback.statusCode : 500;
  return {
    statusCode,
    body: {
      ok: false,
      code: fallback?.code ?? "INTERNAL",
      message:
        statusCode >= 500
          ? "Something went wrong"
          : fallback?.message ?? "Bad request",
      requestId,
    },
  };
}