import { HttpService } from '@nestjs/axios';
import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { AxiosResponse } from 'axios';
import { firstValueFrom } from 'rxjs';
import { KeyHandoverPDFDataDto } from 'src/model/dto/key-handover.dto';
import { KeyHandoutRepository } from 'src/model/repositories/key-handout.repository';

@Injectable()
export class PdfService {

  private readonly STORAGESERVER = this.configService.get('STORAGE_HOST')

  constructor(
    private readonly configService: ConfigService,
    private readonly httpService: HttpService,
    private readonly handoverRepo: KeyHandoutRepository
  ) {  }

  public async generatePDF(dto: KeyHandoverPDFDataDto): Promise<{ pdf: Buffer, response: AxiosResponse}> {
    const h = await this.handoverRepo.findOneByOrFail({ id: dto.handoverId });
    const response = await this.post(`${this.STORAGESERVER}/pdf/keyhandover`, dto);
    console.log(response)
    if (response?.data == null) { return; }
    h.pdfFormKey = response.data;
    await this.handoverRepo.save(h);
    return this.getPDFByHandoverKey(response.data)
    
  }

  public async getPDFByHandoverKey(key: string): Promise<{ pdf: Buffer, response: AxiosResponse}> {
    return new Promise(resolve => {
      this.httpService.get(`${this.STORAGESERVER}/pdf/keyhandover/${key}`, {
      responseType: 'arraybuffer',
      }).subscribe({
        next: pdf => {
          const pdfBuffer = Buffer.from(pdf.data);
          resolve({ pdf: pdfBuffer, response: pdf})
        },
        error: e => console.log(e)
      })
    })
  }

  private async post(url: string, data: any): Promise<AxiosResponse> {
    return new Promise(resolve => {
      this.httpService.post(url, data).subscribe({
        next: data => resolve(data)
      })
    })
  }
}