import { Injectable, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { generatePdf } from '@safeersoft/@safeersoft/pdf-reporter';

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

  constructor(private readonly configService: ConfigService) {}

  async generatePdf(params: {
    title: string;
    data: any[];
    columns: any[];
    emailTo?: string;
    userInfo?: any;
  }) {
    try {
      this.logger.log(`Generating PDF: ${params.title}`);

      const result = await generatePdf({
        title: params.title,
        data: params.data,
        columns: params.columns,
        userInfo: params.userInfo,
        
        // S3 Upload (auto-configured from environment)
        s3: {
          bucket: this.configService.get('S3_BUCKET_NAME'),
          region: this.configService.get('AWS_REGION'),
          accessKeyId: this.configService.get('AWS_ACCESS_KEY_ID'),
          secretAccessKey: this.configService.get('AWS_SECRET_ACCESS_KEY'),
        },

        // Email (optional, auto-configured from environment)
        email: params.emailTo ? {
          to: params.emailTo,
          smtp: {
            host: this.configService.get('SMTP_HOST'),
            port: parseInt(this.configService.get('SMTP_PORT', '587')),
            secure: this.configService.get('SMTP_SECURE') === 'true',
            auth: {
              user: this.configService.get('SMTP_USER'),
              pass: this.configService.get('SMTP_PASS'),
            },
          },
        } : undefined,

        // Custom logging to integrate with NestJS
        logging: {
          debug: (msg: string) => this.logger.debug(msg),
          info: (msg: string) => this.logger.log(msg),
          warn: (msg: string) => this.logger.warn(msg),
          error: (msg: string) => this.logger.error(msg),
        },
      });

      this.logger.log(`PDF generated successfully in ${result.durationMs}ms`);
      
      return {
        success: true,
        url: result.s3?.url,
        fileName: result.fileName,
        size: result.sizeBytes,
        processingTime: result.durationMs,
        emailSent: !!params.emailTo,
      };

    } catch (error) {
      this.logger.error(`PDF generation failed: ${error.message}`);
      throw error;
    }
  }
}