using System.Collections.ObjectModel;
using System.ServiceProcess;
using System.Windows.Input;
using SpdUp.Core;
using SpdUp.Models;
using SpdUp.Services;

namespace SpdUp.ViewModels;

/// <summary>
/// Service Manager ViewModel.
/// </summary>
public sealed class ServiceManagerViewModel : ObservableObject
{
    private readonly AppSettings _settings;

    public ObservableCollection<ServiceEntry> Services { get; } = new();

    private ServiceEntry? _selectedService;
    public ServiceEntry? SelectedService
    {
        get => _selectedService;
        set => SetProperty(ref _selectedService, value);
    }

    public ICommand RefreshCommand { get; }
    public ICommand StopServiceCommand { get; }
    public ICommand StartServiceCommand { get; }

    public ServiceManagerViewModel(AppSettings settings)
    {
        _settings = settings;

        RefreshCommand = new RelayCommand(Refresh);
        StopServiceCommand = new RelayCommand(StopSelected, () => SelectedService is not null);
        StartServiceCommand = new RelayCommand(StartSelected, () => SelectedService is not null);

        Refresh();
    }

    private void Refresh()
    {
        Services.Clear();

        // Show the configured services plus all known non-critical ones
        var names = new HashSet<string>(_settings.ServicesToStop, StringComparer.OrdinalIgnoreCase);
        foreach (var k in ServiceManagementService.KnownNonCriticalServices.Keys)
            names.Add(k);

        foreach (var entry in ServiceManagementService.GetServiceList(names))
            Services.Add(entry);
    }

    private void StopSelected()
    {
        if (SelectedService is null) return;
        ServiceManagementService.StopService(SelectedService.ServiceName);
        Refresh();
    }

    private void StartSelected()
    {
        if (SelectedService is null) return;
        ServiceManagementService.StartService(SelectedService.ServiceName);
        Refresh();
    }
}