import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { MigrationExport } from '../../entities/migration-export.entity';

@Injectable()
export class MigrationService {
  constructor(
    @InjectRepository(MigrationExport)
    private readonly exportRepo: Repository<MigrationExport>,
  ) {}

  async exportConfig(licenseId: string, userId: string, exportType: string = 'full'): Promise<MigrationExport> {
    const expiresAt = new Date();
    expiresAt.setDate(expiresAt.getDate() + 7); // 7 days expiry

    const exportRecord = this.exportRepo.create({
      license_id: licenseId,
      export_type: exportType,
      storage_path: `/exports/${licenseId}/${Date.now()}.json`,
      file_size_bytes: 0, // Stub - would calculate after actual export
      created_by: userId,
      expires_at: expiresAt,
    });

    return this.exportRepo.save(exportRecord);
  }

  async getExports(licenseId: string): Promise<MigrationExport[]> {
    return this.exportRepo.find({
      where: { license_id: licenseId },
      order: { created_at: 'DESC' },
    });
  }

  async importConfig(licenseId: string, data: any): Promise<{ message: string }> {
    // Stub implementation - would validate and import data in production
    return { message: 'Import complete' };
  }
}