graycoreio/daffodil

import { isPlatformBrowser } from '@angular/common';
import {
  inject,
  PLATFORM_ID,
} from '@angular/core';

import { DaffBrowserBase64Service } from './browser/browser.service';
import { DaffServerBase64Service } from './server/public_api';
import { createSingleInjectionToken } from '../injection-tokens/public_api';

/**
 * A service for encoding and decoding base64 strings.
 */
export interface DaffBase64Service {
  /**
   * Encodes an ASCII string to base64.
   */
  encode(str: string): string;
  /**
   * Decodes a base64 string to ASCII.
   */
  decode(str: string): string;
}

export const {
  /**
   * A token which creates a base64 service appropriate for the current environment, i.e., browser vs. server.
   */
  token: DaffBase64ServiceToken,
  /**
   * Provider function for {@link DaffBase64ServiceToken}.
   */
  provider: provideDaffBase64Service,
} = createSingleInjectionToken<DaffBase64Service>(
  'DaffBase64ServiceToken',
  {
    providedIn: 'root',
    factory: () => isPlatformBrowser(inject<string>(PLATFORM_ID))
      ? new DaffBrowserBase64Service(inject<string>(PLATFORM_ID))
      : new DaffServerBase64Service(inject<string>(PLATFORM_ID)),
  },
);