import { HttpService } from '@nestjs/axios';
import { HttpException, Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { JwtService } from '@nestjs/jwt';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { catchError, lastValueFrom, map } from 'rxjs';

import { User, UserDocument } from './models/user.model';

@Injectable()
export class AuthService {
  constructor(
    @InjectModel('user')
    private readonly userModel: Model<UserDocument>,
    private config: ConfigService,
    private httpService: HttpService,
    private jwtService: JwtService,
  ) {}

  async login(code: string): Promise<string> {
    const [token, refreshToken] = await lastValueFrom(
      this.httpService
        .post(
          `${this.config.get<string>(
            'vatsim-auth.base-url',
          )}/${this.config.get<string>('vatsim-auth.token-endpoint')}`,
          {
            grant_type: 'authorization_code',
            client_id: this.config.get<string>('vatsim-auth.client-id'),
            client_secret: this.config.get<string>('vatsim-auth.client-secret'),
            redirect_uri: 'http://localhost:3000/auth/vatsim',
            code,
          },
        )
        .pipe(
          map((response) => [
            response.data.access_token,
            response.data.refresh_token,
          ]),
          catchError((err) => {
            throw new HttpException(err.response.data, err.response.status);
          }),
        ),
    );

    const userdata = await lastValueFrom(
      this.httpService
        .get(
          `${this.config.get<string>(
            'vatsim-auth.base-url',
          )}/${this.config.get<string>('vatsim-auth.user-endpoint')}`,
          {
            headers: {
              Authorization: `Bearer ${token}`,
              Accept: 'application/json',
            },
          },
        )
        .pipe(
          map((response) => response.data.data),
          catchError((err) => {
            throw new HttpException(err.response.data, err.response.status);
          }),
        ),
    );

    if (userdata.oauth.token_valid) {
      let fullName = '';
      if (userdata.personal !== undefined) {
        fullName = userdata.personal.name_full;
      }

      this.userModel.findOne({ vatsimId: userdata.cid }).then((user) => {
        if (!user) {
          this.userModel.create({
            vatsimId: userdata.cid,
            fullName,
            vatsimToken: token,
            vatsimRefreshToken: refreshToken,
          });
        } else {
          this.userModel.findOneAndUpdate(
            { vatsimId: userdata.cid },
            {
              fullName,
              vatsimToken: token,
              vatsimRefreshToken: refreshToken,
            },
          );
        }
      });

      const payload = { vatsimId: userdata.cid, sub: token };
      return this.jwtService.sign(payload);
    }

    return undefined;
  }

  async user(token: string): Promise<User> {
    const payload = this.jwtService.verify(token, {
      secret: this.config.get<string>('server.jwt-secret'),
    });

    return this.userModel
      .findOne({ vatsimId: payload.vatsimId })
      .then((user) => {
        if (!user) return undefined;
        return user;
      });
  }
}