import {
  Inject,
  Injectable,
  InternalServerErrorException,
  Logger,
} from '@nestjs/common';
import { SMS_CONFIG } from '../constants';
import type { ISmsConfigs } from 'src/config/sms.config';
import { catchError, firstValueFrom } from 'rxjs';
import { HttpService } from '@nestjs/axios';
import { AxiosError } from 'axios';
import { SmsRequest, SmsSendResponse } from '../interfaces/ISms';

@Injectable()
export class SmsService {
  private readonly logger = new Logger(SmsService.name);

  constructor(
    @Inject(SMS_CONFIG) private smsConfigs: ISmsConfigs,
    private readonly httpService: HttpService,
  ) {}

  async sendSms(body: SmsRequest): Promise<SmsSendResponse> {
    try {
      const { data } = await firstValueFrom(
        this.httpService
          .post<SmsSendResponse>(
            `${this.smsConfigs.API_URL}/send/verify`,
            body,
            {
              headers: {
                'X-API-KEY': this.smsConfigs.API_KEY,
              },
              timeout: 5000,
            },
          )
          .pipe(
            catchError((error: AxiosError) => {
              this.logger.error(
                'Error while calling SMS provider.',
                error.stack,
              );

              throw new InternalServerErrorException(
                'Failed to communicate with SMS provider.',
              );
            }),
          ),
      );

      return data;
    } catch (error) {
      this.logger.error(
        'Failed to send SMS.',
        error instanceof Error ? error.stack : undefined,
      );

      throw new InternalServerErrorException('Failed to send SMS.');
    }
  }
}