import { Injectable } from '@nestjs/common';
import { KeycloakUser } from 'src/models/main.model';
import urlcat from 'urlcat';
@Injectable()
export class AuthService {
  public async getAccessToken() {
    try {
      const params = new URLSearchParams();
      params.append('grant_type', 'password');
      params.append('username', process.env.KEYCLOAK_ADMIN_USER);
      params.append('password', process.env.KEYCLOAK_ADMIN_PASSWORD);
      const URL = `${process.env.KEYCLOAK_HOST}${process.env.KEYCLOAK_TOKEN_URL}`;

      const response = await fetch(URL, {
        method: 'POST',
        body: params.toString(),
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          Authorization: process.env.KEYCLOAK_ADMIN_TOKEN,
        },
      });
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      const data = await response.json();
      return (<any>data).access_token;
    } catch (error) {
      if (error.name === 'HTTPError') {
        const errorJson = await error.response.json();
        console.error('Fehlerantwort vom Server:', errorJson);
      } else {
        console.error('Allgemeiner Fehler:', error);
      }
    }
  }

  public async getUsers(): Promise<KeycloakUser[]> {
    const token = await this.getAccessToken();
    const URL = `${process.env.KEYCLOAK_HOST}${process.env.KEYCLOAK_ADMIN_REALM}${process.env.REALM}${process.env.KEYCLOAK_USERS_URL}`;
    const response = await fetch(URL, {
      method: 'GET',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        Authorization: `Bearer ${token}`,
      },
    });
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const data = await response.json();
    return data as KeycloakUser[];
  }
  public async getUser(userid: string): Promise<KeycloakUser> {
    const token = await this.getAccessToken();
    const URLPATH = `${process.env.KEYCLOAK_ADMIN_REALM}${process.env.REALM}${process.env.KEYCLOAK_USER_URL}`;
    const URL = urlcat(process.env.KEYCLOAK_HOST, URLPATH, { userid });
    const response = await fetch(URL, {
      method: 'GET',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        Authorization: `Bearer ${token}`,
      },
    });
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const data = await response.json();
    return data as KeycloakUser;
  }
  public async updateKeycloakUser(keycloakUser: KeycloakUser): Promise<void> {
    const token = await this.getAccessToken();
    const userid = keycloakUser.id;
    const URLPATH = `${process.env.KEYCLOAK_ADMIN_REALM}${process.env.REALM}${process.env.KEYCLOAK_USER_URL}`;
    const URL = urlcat(process.env.KEYCLOAK_HOST, URLPATH, { userid });
    const response = await fetch(URL, {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Bearer ${token}`,
      },
      body: JSON.stringify(keycloakUser),
    });
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
  }
  // public async getLastLogin(userid: string) {
  //   const token = await this.getAccessToken();
  //   const URLPATH = `${process.env.KEYCLOAK_ADMIN_REALM}${process.env.REALM}${process.env.KEYCLOAK_LASTLOGIN_URL}`;
  //   const URL = urlcat(process.env.KEYCLOAK_HOST, URLPATH, { userid });
  //   const response = await ky
  //     .get(URL, {
  //       headers: {
  //         'Content-Type': 'application/x-www-form-urlencoded',
  //         Authorization: `Bearer ${token}`,
  //       },
  //     })
  //     .json();
  //   return response;
  // }
}