import {
  BadRequestException,
  Injectable,
  UnauthorizedException,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { createHmac } from 'crypto';
import { Repository } from 'typeorm';
import { PipelineUnits } from '../pipeline-tasks/enums/pipeline-units.enum';
import { PipelineTasksService } from '../pipeline-tasks/pipeline-tasks.service';
import { GiteaHookPayloadDto } from './dtos/gitea-hook-payload.dto';
import { CreateWebhookLogModel } from './models/create-webhook-log.model';
import { WebhookLog } from './webhook-log.entity';

@Injectable()
export class WebhooksService {
  constructor(
    @InjectRepository(WebhookLog)
    private readonly repository: Repository<WebhookLog>,
    private readonly taskService: PipelineTasksService,
  ) {}

  async onCall(
    pipelineId: string,
    model: CreateWebhookLogModel<GiteaHookPayloadDto>,
  ) {
    if (model.sourceEvent.toLowerCase() === 'push') {
      const taskDto = {
        pipelineId,
        commit: model.payload.after,
        units: Object.values(PipelineUnits),
      };
      await this.taskService.addTask(taskDto);
      return await this.repository.save(
        this.repository.create({
          ...model,
          localEvent: 'create-pipeline-task',
          localPayload: taskDto,
        }),
      );
    } else {
      throw new BadRequestException('无法处理的请求');
    }
  }

  async verifySignature(payload: any, signature: string, secret: string) {
    const local = await new Promise<string>((resolve, reject) => {
      const hmac = createHmac('sha256', secret);
      hmac.on('readable', () => {
        const data = hmac.read();
        if (data) {
          resolve(data.toString('hex'));
        }
      });
      hmac.on('error', (err) => {
        reject(err);
      });
      hmac.write(payload);
      hmac.end();
    });
    if (local !== signature) {
      throw new UnauthorizedException();
    }
  }
}