import { LivekitReasonedError } from '../../errors';
import type { DataTrackHandleError } from '../handle';

export enum DataTrackDeserializeErrorReason {
  TooShort = 0,
  HeaderOverrun = 1,
  MissingExtWords = 2,
  UnsupportedVersion = 3,
  InvalidHandle = 4,
  MalformedExt = 5,
}

export class DataTrackDeserializeError<
  Reason extends DataTrackDeserializeErrorReason = DataTrackDeserializeErrorReason,
> extends LivekitReasonedError<DataTrackDeserializeErrorReason> {
  readonly name = 'DataTrackDeserializeError';

  reason: Reason;

  reasonName: string;

  cause?: Reason extends DataTrackDeserializeErrorReason.InvalidHandle
    ? DataTrackHandleError
    : never;

  constructor(message: string, reason: Reason, options?: { cause?: unknown }) {
    super(19, message, options);
    this.reason = reason;
    this.reasonName = DataTrackDeserializeErrorReason[reason];
  }

  static tooShort() {
    return new DataTrackDeserializeError(
      'Too short to contain a valid header',
      DataTrackDeserializeErrorReason.TooShort,
    );
  }

  static headerOverrun() {
    return new DataTrackDeserializeError(
      'Header exceeds total packet length',
      DataTrackDeserializeErrorReason.HeaderOverrun,
    );
  }

  static missingExtWords() {
    return new DataTrackDeserializeError(
      'Extension word indicator is missing',
      DataTrackDeserializeErrorReason.MissingExtWords,
    );
  }

  static unsupportedVersion(version: number) {
    return new DataTrackDeserializeError(
      `Unsupported version ${version}`,
      DataTrackDeserializeErrorReason.UnsupportedVersion,
    );
  }

  static invalidHandle(cause: DataTrackHandleError) {
    return new DataTrackDeserializeError(
      `invalid track handle: ${cause.message}`,
      DataTrackDeserializeErrorReason.InvalidHandle,
      { cause },
    );
  }

  static malformedExt(tag: number) {
    return new DataTrackDeserializeError(
      `Extension with tag ${tag} is malformed`,
      DataTrackDeserializeErrorReason.MalformedExt,
    );
  }
}

export enum DataTrackSerializeErrorReason {
  TooSmallForHeader = 0,
  TooSmallForPayload = 1,
}

export class DataTrackSerializeError<
  Reason extends DataTrackSerializeErrorReason = DataTrackSerializeErrorReason,
> extends LivekitReasonedError<DataTrackSerializeErrorReason> {
  readonly name = 'DataTrackSerializeError';

  reason: Reason;

  reasonName: string;

  constructor(message: string, reason: Reason, options?: { cause?: unknown }) {
    super(19, message, options);
    this.reason = reason;
    this.reasonName = DataTrackSerializeErrorReason[reason];
  }

  static tooSmallForHeader() {
    return new DataTrackSerializeError(
      'Buffer cannot fit header',
      DataTrackSerializeErrorReason.TooSmallForHeader,
    );
  }

  static tooSmallForPayload() {
    return new DataTrackSerializeError(
      'Buffer cannot fit payload',
      DataTrackSerializeErrorReason.TooSmallForPayload,
    );
  }
}