#nullable enable

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Marechai.App.Models;

namespace Marechai.App.Services;

/// <summary>
///     Service for fetching company details from the API
/// </summary>
public class CompanyDetailService
{
    private readonly ApiClient                 _apiClient;
    private readonly ILogger<CompanyDetailService> _logger;

    public CompanyDetailService(ApiClient apiClient, ILogger<CompanyDetailService> logger)
    {
        _apiClient = apiClient;
        _logger    = logger;
    }

    /// <summary>
    ///     Gets a single company by ID with full details
    /// </summary>
    public async Task<CompanyDto?> GetCompanyByIdAsync(int companyId)
    {
        try
        {
            _logger.LogInformation("Fetching company {CompanyId} from API", companyId);

            CompanyDto? company = await _apiClient.Companies[companyId].GetAsync();

            if(company == null)
            {
                _logger.LogWarning("Company {CompanyId} not found", companyId);

                return null;
            }

            _logger.LogInformation("Successfully fetched company {CompanyId}: {CompanyName}", companyId, company.Name);

            return company;
        }
        catch(Exception ex)
        {
            _logger.LogError(ex, "Error fetching company {CompanyId} from API", companyId);

            return null;
        }
    }

    /// <summary>
    ///     Gets machines (computers) made by a company
    /// </summary>
    public async Task<List<MachineDto>> GetComputersByCompanyAsync(int companyId)
    {
        try
        {
            _logger.LogInformation("Fetching computers for company {CompanyId}", companyId);

            List<MachineDto>? machines = await _apiClient.Companies[companyId].Machines.GetAsync();

            if(machines == null) return [];

            _logger.LogInformation("Successfully fetched {Count} computers for company {CompanyId}", machines.Count, companyId);

            return machines;
        }
        catch(Exception ex)
        {
            _logger.LogError(ex, "Error fetching computers for company {CompanyId}", companyId);

            return [];
        }
    }

    /// <summary>
    ///     Gets the sold-to company (when company was sold, merged, or renamed)
    /// </summary>
    public async Task<CompanyDto?> GetSoldToCompanyAsync(int? companyId)
    {
        if(companyId is null or <= 0) return null;

        try
        {
            _logger.LogInformation("Fetching sold-to company {CompanyId}", companyId);

            CompanyDto? company = await _apiClient.Companies[companyId.Value].GetAsync();

            return company;
        }
        catch(Exception ex)
        {
            _logger.LogError(ex, "Error fetching sold-to company {CompanyId}", companyId);

            return null;
        }
    }
}