export enum WarningTypes {
  WARNING = 'Warning',
  DEPRECATION = 'DeprecationWarning',
}

export function warn(warning: Warning) {
  // Only show a given warning once
  if (warning.warned) {
    return;
  }
  warning.warned = true;
  if (typeof process !== 'undefined' && process.emitWarning) {
    // @types/node doesn't recognize the emitWarning syntax which
    // accepts a config object, so `as any` it is
    // https://nodejs.org/docs/latest-v8.x/api/process.html#process_process_emitwarning_warning_options
    // tslint:disable-next-line no-any
    process.emitWarning(warning.message, warning as any);
  } else {
    console.warn(warning.message);
  }
}

export interface Warning {
  code: string;
  type: WarningTypes;
  message: string;
  warned?: boolean;
}

export const PROBLEMATIC_CREDENTIALS_WARNING = {
  code: 'google-auth-library:00001',
  type: WarningTypes.WARNING,
  message: [
    'Your application has authenticated using end user credentials from Google',
    'Cloud SDK. We recommend that most server applications use service accounts',
    'instead. If your application continues to use end user credentials from',
    'Cloud SDK, you might receive a "quota exceeded" or "API not enabled" error.',
    'For more information about service accounts, see',
    'https://cloud.google.com/docs/authentication/.',
  ].join(' '),
};

export const DEFAULT_PROJECT_ID_DEPRECATED = {
  code: 'google-auth-library:DEP002',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `getDefaultProjectId` method has been deprecated, and will be removed',
    'in the 3.0 release of google-auth-library. Please use the `getProjectId`',
    'method instead.',
  ].join(' '),
};

export const COMPUTE_CREATE_SCOPED_DEPRECATED = {
  code: 'google-auth-library:DEP003',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `createScopedRequired` method on the `Compute` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library.',
  ].join(' '),
};

export const JWT_CREATE_SCOPED_DEPRECATED = {
  code: 'google-auth-library:DEP004',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `createScopedRequired` method on the `JWT` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library.',
  ].join(' '),
};

export const IAM_CREATE_SCOPED_DEPRECATED = {
  code: 'google-auth-library:DEP005',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `createScopedRequired` method on the `IAM` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library.',
  ].join(' '),
};

export const JWT_ACCESS_CREATE_SCOPED_DEPRECATED = {
  code: 'google-auth-library:DEP006',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `createScopedRequired` method on the `JWTAccess` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library.',
  ].join(' '),
};

export const REFRESH_ACCESS_TOKEN_DEPRECATED = {
  code: 'google-auth-library:DEP007',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `refreshAccessToken` method has been deprecated, and will be removed',
    'in the 3.0 release of google-auth-library. Please use the `getRequestHeaders`',
    'method instead.',
  ].join(' '),
};
export const OAUTH_GET_REQUEST_METADATA_DEPRECATED = {
  code: 'google-auth-library:DEP004',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `getRequestMetadata` method on the `OAuth2` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library. Please use',
    'the `getRequestHeaders` method instead.',
  ].join(' '),
};

export const IAM_GET_REQUEST_METADATA_DEPRECATED = {
  code: 'google-auth-library:DEP005',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `getRequestMetadata` method on the `IAM` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library. Please use',
    'the `getRequestHeaders` method instead.',
  ].join(' '),
};

export const JWT_ACCESS_GET_REQUEST_METADATA_DEPRECATED = {
  code: 'google-auth-library:DEP006',
  type: WarningTypes.DEPRECATION,
  message: [
    'The `getRequestMetadata` method on the `JWTAccess` class has been deprecated,',
    'and will be removed in the 3.0 release of google-auth-library. Please use',
    'the `getRequestHeaders` method instead.',
  ].join(' '),
};