import { OAuth2CodeAdapter, OAuth2Code } from '@icynet/oauth2-provider';
import { OAuth2TokenType } from 'src/modules/objects/oauth2-token/oauth2-token.entity';
import { TokenService } from 'src/modules/utility/services/token.service';
import { OAuth2ClientService } from 'src/modules/objects/oauth2-client/oauth2-client.service';
import { UserService } from 'src/modules/objects/user/user.service';
import { OAuth2TokenService } from 'src/modules/objects/oauth2-token/oauth2-token.service';
import { FormUtilityService } from 'src/modules/utility/services/form-utility.service';
import { Injectable } from '@nestjs/common';

@Injectable()
export class CodeAdapter implements OAuth2CodeAdapter {
  constructor(
    private readonly token: TokenService,
    private readonly tokenService: OAuth2TokenService,
    private readonly clientService: OAuth2ClientService,
    private readonly userService: UserService,
    private readonly form: FormUtilityService,
  ) {}

  ttl = 3600;
  challengeMethods = ['plain', 'S256'];

  async create(
    userId: number,
    clientId: string,
    scope: string | string[],
    ttl: number,
    nonce?: string,
    codeChallenge?: string,
    codeChallengeMethod?: 'plain' | 'S256',
  ): Promise<string> {
    const client = await this.clientService.getById(clientId);
    const user = await this.userService.getById(userId);
    const accessToken = this.token.generateString(64);

    // Standardize scope value
    const scopes = (
      !Array.isArray(scope) ? this.form.splitScope(scope) : scope
    ).join(' ');

    const expiresAt = new Date(Date.now() + ttl * 1000);
    const pcke =
      codeChallenge && codeChallengeMethod
        ? `${this.challengeMethods.indexOf(
            codeChallengeMethod,
          )}:${codeChallenge}`
        : null;

    this.tokenService.insertToken(
      accessToken,
      OAuth2TokenType.CODE,
      client,
      scopes,
      expiresAt,
      user,
      nonce,
      pcke,
    );

    return accessToken;
  }

  async fetchByCode(code: string | OAuth2Code): Promise<OAuth2Code> {
    const findBy = typeof code === 'string' ? code : code.code;
    const find = await this.tokenService.fetchByToken(
      findBy,
      OAuth2TokenType.CODE,
    );

    if (!find) {
      return null;
    }

    let codeChallenge: string;
    let codeChallengeMethod: 'plain' | 'S256';
    if (find.pcke) {
      codeChallengeMethod = this.challengeMethods[
        Number(find.pcke.substring(0, 1))
      ] as 'plain' | 'S256';
      codeChallenge = find.pcke.substring(2);
    }

    return {
      ...find,
      code: find.token,
      client_id: find.client.client_id,
      user_id: find.user.id,
      code_challenge: codeChallenge,
      code_challenge_method: codeChallengeMethod,
    };
  }

  async removeByCode(code: string | OAuth2Code): Promise<boolean> {
    const findBy = typeof code === 'string' ? code : code.code;
    const find = await this.tokenService.fetchByToken(
      findBy,
      OAuth2TokenType.CODE,
    );
    this.tokenService.remove(find);
    return true;
  }

  getUserId(code: OAuth2Code): string {
    return code.user_id as string;
  }

  getClientId(code: OAuth2Code): string {
    return code.client_id as string;
  }

  getScope(code: OAuth2Code): string {
    return code.scope;
  }

  checkTTL(code: OAuth2Code): boolean {
    return code.expires_at.getTime() > Date.now();
  }

  getCodeChallenge(code: OAuth2Code) {
    return {
      method: code.code_challenge_method,
      challenge: code.code_challenge,
    };
  }
}