using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using LehrerApp.Data;
using LehrerApp.Desktop.Services;
using LehrerApp.Desktop.ViewModels.Planning;
using LehrerApp.Sync;
using LehrerApp.Sync.Crypto;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Security.Cryptography;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace LehrerApp.Desktop.ViewModels.Settings;

public partial class SettingsViewModel
{
    // ── Schulweiter Jahresplan (ClassyPlan-iCal) ─────────────────────────────

    [ObservableProperty] private bool _annualPlanIsConfigured;
    [ObservableProperty] private string _annualPlanIcalUrlInput = "";
    [ObservableProperty] private string _annualPlanUrlError = "";
    [ObservableProperty] private string _annualPlanStatusDisplay = "";
    [ObservableProperty] private bool _annualPlanFetchBusy;

    // ── Schulweiter Jahresplan: Laden / Speichern / Entfernen / Jetzt abrufen ─

    private void LoadAnnualPlanSettings()
    {
        AnnualPlanIsConfigured = _annualPlanSettings.IsConfigured;
        AnnualPlanStatusDisplay = _annualPlanSettings.LastSyncAt is { } at
            ? $"Letzter Abgleich: {at.ToLocalTime():dd.MM.yyyy HH:mm} — {_annualPlanSettings.LastSyncStatus}"
            : "Noch kein Abgleich durchgeführt.";
    }

    [RelayCommand]
    private void AnnualPlanSaveUrl()
    {
        AnnualPlanUrlError = "";
        if (string.IsNullOrWhiteSpace(AnnualPlanIcalUrlInput))
        {
            AnnualPlanUrlError = "iCal-URL erforderlich.";
            return;
        }
        if (!Uri.TryCreate(AnnualPlanIcalUrlInput, UriKind.Absolute, out var uri) ||
            uri.Scheme is not ("http" or "https"))
        {
            AnnualPlanUrlError = "Ungültige HTTP(S)-URL.";
            return;
        }

        _annualPlanSettings.SetIcalUrl(AnnualPlanIcalUrlInput.Trim());
        _annualPlanSettings.SetEnabled(true);
        AnnualPlanIcalUrlInput = "";
        AppBootstrapper.RestartApplication();
    }

    [RelayCommand]
    private void AnnualPlanRemove()
    {
        _annualPlanSync?.Clear();
        _annualPlanSettings.ClearIcalUrl();
        LoadAnnualPlanSettings();
        AppBootstrapper.RestartApplication();
    }

    [RelayCommand]
    private async Task AnnualPlanFetchNow()
    {
        if (_annualPlanSync is null)
        {
            AnnualPlanStatusDisplay = "Abgleich nicht aktiv — App neu starten.";
            return;
        }

        AnnualPlanFetchBusy = true;
        try
        {
            await _annualPlanSync.PollAsync();
            LoadAnnualPlanSettings();
        }
        finally
        {
            AnnualPlanFetchBusy = false;
        }
    }
}