export class HttpProblem extends Error {
  constructor(
    readonly status: number,
    readonly code: string,
    message: string,
    readonly detail: Record<string, unknown> = {},
  ) {
    super(message);
  }
}

export function problemResponse(error: unknown): Response {
  const problem =
    error instanceof HttpProblem
      ? error
      : new HttpProblem(500, "internal-error", "Internal server error");

  return Response.json(
    {
      type: `https://cfw-attachment.bowong.cc/problems/${problem.code}`,
      title: problem.message,
      status: problem.status,
      detail: problem.detail,
      code: problem.code,
    },
    {
      status: problem.status,
      headers: {
        "content-type": "application/problem+json",
      },
    },
  );
}