import { ICompanyRepository } from '../../../Repositories/interfaces/ICompanyRepository';
import { CompanyResponseDto, CompanyBasicDto } from '../../../Database/dto/company.dto';
import {
  GetCompanyByIdQuery,
  GetCompanyByNameQuery,
  GetAllCompaniesQuery,
  GetBasicCompanyByIdQuery,
  GetAllBasicCompaniesQuery
} from './CompanyQuery';
import { appLogger } from '../../../utils/logger';

export class CompanyQueryHandler {
  constructor(private readonly companyRepository: ICompanyRepository) {
    appLogger.info('CompanyQueryHandler initialized');
  }

  // Get company by ID
  async handleGetById(query: GetCompanyByIdQuery): Promise<CompanyResponseDto | null> {
    try {
      appLogger.info('Getting company by ID', {
        companyId: query.id,
        action: 'get_company_by_id'
      });
      
      // Validate ID
      if (!query.id || query.id <= 0) {
        throw new Error('Valid company ID is required');
      }

      const result = await this.companyRepository.findById(query.id);
      
      if (!result) {
        appLogger.warn('Company not found', {
          companyId: query.id
        });
        return null;
      }

      appLogger.info('Company found successfully', {
        companyId: result.CompanyId,
        name: result.Name
      });

      return result;

    } catch (error: any) {
      appLogger.errorEvent('Error getting company by ID', 'company_query', {
        error: error.message,
        companyId: query.id
      });
      throw new Error(`Failed to get company by ID: ${error.message}`);
    }
  }

  // Get company by name
  async handleGetByName(query: GetCompanyByNameQuery): Promise<CompanyResponseDto | null> {
    try {
      appLogger.info('Getting company by name', {
        companyName: query.name,
        action: 'get_company_by_name'
      });
      
      // Validate name
      if (!query.name || query.name.trim() === '') {
        throw new Error('Valid company name is required');
      }

      const result = await this.companyRepository.findByName(query.name.trim());
      
      if (!result) {
        appLogger.warn('Company not found by name', {
          companyName: query.name
        });
        return null;
      }

      appLogger.info('Company found by name', {
        companyId: result.CompanyId,
        name: result.Name
      });

      return result;

    } catch (error: any) {
      appLogger.errorEvent('Error getting company by name', 'company_query', {
        error: error.message,
        companyName: query.name
      });
      throw new Error(`Failed to get company by name: ${error.message}`);
    }
  }

  // Get all companies
  async handleGetAll(query: GetAllCompaniesQuery): Promise<CompanyResponseDto[]> {
    try {
      appLogger.info('Getting all companies', {
        action: 'get_all_companies'
      });
      
      const result = await this.companyRepository.findAll();
      
      appLogger.info('Companies retrieved successfully', {
        count: result.length
      });

      return result;

    } catch (error: any) {
      appLogger.errorEvent('Error getting all companies', 'company_query', {
        error: error.message
      });
      throw new Error(`Failed to get all companies: ${error.message}`);
    }
  }

  // Get basic company by ID
  async handleGetBasicById(query: GetBasicCompanyByIdQuery): Promise<CompanyBasicDto | null> {
    try {
      appLogger.info('Getting basic company by ID', {
        companyId: query.id,
        action: 'get_basic_company_by_id'
      });
      
      // Validate ID
      if (!query.id || query.id <= 0) {
        throw new Error('Valid company ID is required');
      }

      const result = await this.companyRepository.findBasicById(query.id);
      
      if (!result) {
        appLogger.warn('Basic company not found', {
          companyId: query.id
        });
        return null;
      }

      appLogger.info('Basic company found successfully', {
        companyId: result.CompanyId,
        name: result.Name
      });

      return result;

    } catch (error: any) {
      appLogger.errorEvent('Error getting basic company by ID', 'company_query', {
        error: error.message,
        companyId: query.id
      });
      throw new Error(`Failed to get basic company by ID: ${error.message}`);
    }
  }

  // Get all basic companies
  async handleGetAllBasic(query: GetAllBasicCompaniesQuery): Promise<CompanyBasicDto[]> {
    try {
      appLogger.info('Getting all basic companies', {
        action: 'get_all_basic_companies'
      });
      
      const result = await this.companyRepository.findAllBasic();
      
      appLogger.info('Basic companies retrieved successfully', {
        count: result.length
      });

      return result;

    } catch (error: any) {
      appLogger.errorEvent('Error getting all basic companies', 'company_query', {
        error: error.message
      });
      throw new Error(`Failed to get all basic companies: ${error.message}`);
    }
  }
}