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;
    private readonly IAdminAuditService _adminAudit;
    private readonly ISyncService _syncService;

    [ObservableProperty]
    private string _syncApiEndpoint = string.Empty;

    [ObservableProperty]
    private string _scanIntervalDays = "0";

    [ObservableProperty]
    private string _scanIntervalHours = "0";

    [ObservableProperty]
    private string _scanIntervalMinutes = "1";

    [ObservableProperty]
    private string _scanIntervalSeconds = "0";

    [ObservableProperty]
    private string _adminCardId = "ADMIN";

    [ObservableProperty]
    private string _saveMessage = string.Empty;

    [ObservableProperty]
    private bool _isError;

    [ObservableProperty]
    private bool _isSaving;

    [ObservableProperty]
    private bool _isPosting;


    public bool CanPostNow => !IsPosting;
    public string PostButtonText => IsPosting ? "Posting..." : "Post Data";

    partial void OnIsPostingChanged(bool value)
    {
        OnPropertyChanged(nameof(PostButtonText));
        OnPropertyChanged(nameof(CanPostNow));
    }

    public SettingsViewModel(
        IConfigService configService,
        INavigationService navigation,
        IAdminAuditService adminAudit,
        ISyncService syncService)
    {
        _configService = configService;
        _navigation = navigation;
        _adminAudit = adminAudit;
        _syncService = syncService;
        LoadFromConfig();
    }

    /// <summary>Loads config from service.</summary>
    public void LoadFromConfig()
    {
        SyncApiEndpoint = _configService.GetSyncApiEndpoint();
        ScanIntervalDays = _configService.GetScanIntervalDays().ToString();
        ScanIntervalHours = _configService.GetScanIntervalHours().ToString();
        ScanIntervalMinutes = _configService.GetScanIntervalMinutes().ToString();
        ScanIntervalSeconds = _configService.GetScanIntervalSeconds().ToString();

        // Always prefer the latest admin login from the database.
        var last = _adminAudit.GetLastLogin();
        if (last != null && !string.IsNullOrWhiteSpace(last.EmployeeId))
            AdminCardId = last.EmployeeId;
        else
            AdminCardId = "ADMIN";
    }

    [RelayCommand]
    private void Save()
    {
        IsSaving = true;
        if (!int.TryParse(ScanIntervalDays, out var days) || days < 0 || days > 365)
        {
            SaveMessage = "Scan interval Days must be 0–365.";
            IsError = true;
            IsSaving = false;
            return;
        }
        if (!int.TryParse(ScanIntervalHours, out var hours) || hours < 0 || hours > 23)
        {
            SaveMessage = "Scan interval Hours must be 0–23.";
            IsError = true;
            IsSaving = false;
            return;
        }
        if (!int.TryParse(ScanIntervalMinutes, out var minutes) || minutes < 0 || minutes > 59)
        {
            SaveMessage = "Scan interval Minutes must be 0–59.";
            IsError = true;
            IsSaving = false;
            return;
        }
        if (!int.TryParse(ScanIntervalSeconds, out var seconds) || seconds < 0 || seconds > 59)
        {
            SaveMessage = "Scan interval Seconds must be 0–59.";
            IsError = true;
            IsSaving = false;
            return;
        }
        if (days == 0 && hours == 0 && minutes == 0 && seconds == 0)
        {
            SaveMessage = "Scan interval cannot be zero. Use at least 1 second.";
            IsError = true;
            IsSaving = false;
            return;
        }

        _configService.SetSyncApiEndpoint(SyncApiEndpoint?.Trim() ?? string.Empty);
        _configService.SetScanIntervalDays(days);
        _configService.SetScanIntervalHours(hours);
        _configService.SetScanIntervalMinutes(minutes);
        _configService.SetScanIntervalSeconds(seconds);
        _configService.SetAdminCardId(AdminCardId?.Trim() ?? string.Empty);
        SaveMessage = "Settings saved.";
        IsError = false;
        IsSaving = false;
    }

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

    /// <summary>Opens Meal Schedules admin screen (Phase 2.5).</summary>
    [RelayCommand]
    private void OpenMealSchedules()
    {
        _navigation.NavigateToMealSchedules();
    }

    [RelayCommand]
    private async Task PostDataNow()
    {
        if (IsPosting)
            return;

        SaveMessage = string.Empty;
        IsError = false;
        IsPosting = true;

        try
        {
            // If not configured, do not attempt sync.
            if (string.IsNullOrWhiteSpace(_configService.GetMySqlConnectionString()))
            {
                SaveMessage = "MySQL connection string not configured.";
                IsError = true;
                return;
            }

            await _syncService.SyncNowAsync().ConfigureAwait(false);
            SaveMessage = "Posted data to production.";
            IsError = false;
        }
        catch
        {
            SaveMessage = "Failed to post data to production.";
            IsError = true;
        }
        finally
        {
            IsPosting = false;
        }
    }

    private TimeSpan GetDashboardTimeout() => _configService.GetScanInterval();
}