import { DOCUMENT } from '@angular/common';
import { inject, InjectionToken } from '@angular/core';

export const OAUTH_CONFIGURATIONS = new InjectionToken<OauthConfig>('OAUTH_CONFIGURATIONS');
export const LOCATION = new InjectionToken<Location>('LOCATION', {
  providedIn: 'root',
  factory: () => inject(DOCUMENT).location
});
export const STORAGE = new InjectionToken<Storage>('STORAGE', {
  providedIn: 'root',
  factory: () => {
    const sessionStorage = inject(DOCUMENT).defaultView?.sessionStorage;
    // The server DOM has a location but no sessionStorage, so only this token needs a check
    if (!sessionStorage) {
      throw new Error('OAuth requires sessionStorage, which is not available on the server.');
    }
    return sessionStorage;
  }
});

export interface OauthOptions {
  configurations: OauthConfig[];
}

export type OauthConfig = OauthConfigWithAppTokenUrl | OauthConfigWithAppTokenPageIdOrInternalPath;

interface OauthConfigBase {
  /**
   * If set to true, this configuration will be taken as the default config when OAuth actions are requested
   * without a specific config name.
   */
  default?: boolean;
  /**
   * The name of this OAuth config. Will be used for reference to identify which configuration to use when
   * calling one of the OAuth actions (`authorize` or `token`).
   */
  name: string;
  clientId: string;
  authorizeUrl: string;
  tokenUrl: string;
  endSessionUrl?: string;
  revokeUrl?: string;
  scope: string;
  acrValues?: string[];
  /**
   * All requests to this URL (or child paths) will have the access token appended as a header
   * when there is an access token present.
   */
  bffBaseUrl: string;
  /**
   * Defines the threshold when a token is refreshed even before it has expired.
   *
   * Example: If the token still has 5,000 ms before it expires, it will be renewed.
   * If it has 5,001ms, it won't be renewed.
   */
  refreshBeforeExpiryThreshold?: number;
}

export interface OauthConfigWithAppTokenUrl extends OauthConfigBase {
  appTokenUrl: string;
  appTokenPageIdOrInternalPath?: never;
}

export interface OauthConfigWithAppTokenPageIdOrInternalPath extends OauthConfigBase {
  appTokenPageIdOrInternalPath: string;
  appTokenUrl?: never;
}