import { HttpException, HttpStatus } from "@nestjs/common";
import {
  KavenegarNormalized,
  safeJsonStringify,
  unwrapKavenegarTransportError,
} from "./kavenegar-response";

export type SmsOperation = "verifyLookup" | "send";

export class SmsProviderException extends HttpException {
  constructor(
    public readonly operation: SmsOperation,
    public readonly meta: {
      receptor: string;
      template?: string;
      providerBody: unknown;
      normalized: KavenegarNormalized;
    },
  ) {
    super(
      "SMS delivery could not be confirmed by the provider.",
      HttpStatus.BAD_GATEWAY,
    );
  }
}

export class SmsTransportException extends HttpException {
  constructor(
    public readonly operation: SmsOperation,
    public readonly meta: { receptor: string; template?: string },
    public readonly causeUnknown: unknown,
  ) {
    super(
      "SMS service failed before a provider response was received.",
      HttpStatus.BAD_GATEWAY,
    );
  }
}

/** Single-line detail for logs (provider vs transport vs unexpected). */
export function describeSmsError(err: unknown): string {
  if (err instanceof SmsProviderException) {
    const n = err.meta.normalized;
    return [
      `SmsProviderException(${err.operation})`,
      `receptor=${err.meta.receptor}`,
      err.meta.template ? `template=${err.meta.template}` : "",
      `providerStatus=${n.httpLikeStatus ?? "unknown"}`,
      `providerMessage=${n.message ?? "n/a"}`,
      `body=${n.raw}`,
    ]
      .filter(Boolean)
      .join(" ");
  }
  if (err instanceof SmsTransportException) {
    return [
      `SmsTransportException(${err.operation})`,
      `receptor=${err.meta.receptor}`,
      err.meta.template ? `template=${err.meta.template}` : "",
      `detail=${safeJsonStringify(unwrapKavenegarTransportError(err.causeUnknown))}`,
    ]
      .filter(Boolean)
      .join(" ");
  }
  if (err instanceof Error) {
    return `${err.name}: ${err.message}`;
  }
  return safeJsonStringify(err);
}