using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using UtopiaCanteenSystem.Services;

namespace UtopiaCanteenSystem.ViewModels;

/// <summary>
/// ViewModel for SettingsView: editable API endpoint (UIND sync URL), save, load from config.
/// </summary>
public partial class SettingsViewModel : ObservableObject
{
    private readonly IConfigService _configService;
    private readonly INavigationService _navigation;

    [ObservableProperty]
    private string _syncApiEndpoint = string.Empty;

    [ObservableProperty]
    private string _scanTimeoutSeconds = "30";

    [ObservableProperty]
    private string _adminCardId = "ADMIN";

    [ObservableProperty]
    private string _saveMessage = string.Empty;

    [ObservableProperty]
    private bool _isError;

    [ObservableProperty]
    private bool _isSaving;

    public SettingsViewModel(IConfigService configService, INavigationService navigation)
    {
        _configService = configService;
        _navigation = navigation;
        LoadFromConfig();
    }

    /// <summary>Loads SyncApiEndpoint from config service.</summary>
    public void LoadFromConfig()
    {
        SyncApiEndpoint = _configService.GetSyncApiEndpoint();
        ScanTimeoutSeconds = _configService.GetScanTimeoutSeconds().ToString();
        AdminCardId = _configService.GetAdminCardId();
    }

    [RelayCommand]
    private void Save()
    {
        IsSaving = true;
        if (!int.TryParse(ScanTimeoutSeconds, out var seconds) || seconds <= 0)
        {
            SaveMessage = "Scan timeout must be a positive number of seconds.";
            IsError = true;
            IsSaving = false;
            return;
        }

        _configService.SetSyncApiEndpoint(SyncApiEndpoint?.Trim() ?? string.Empty);
        _configService.SetScanTimeoutSeconds(seconds);
        _configService.SetAdminCardId(AdminCardId?.Trim() ?? string.Empty);
        SaveMessage = "Settings saved.";
        IsError = false;
        IsSaving = false;
    }

    [RelayCommand]
    private void Back()
    {
        _navigation.NavigateBackFromSettings(GetDashboardTimeout());
    }

    private TimeSpan GetDashboardTimeout()
    {
        var seconds = _configService.GetScanTimeoutSeconds();
        if (seconds <= 0)
            seconds = 60;
        return TimeSpan.FromSeconds(seconds);
    }
}