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
{
    // ── Gewichtungsschema-Voreinstellungen (2.3.3) ───────────────────────────

    [ObservableProperty] private GradingSchemeEditItem _classScheme = null!;
    [ObservableProperty] private GradingSchemeEditItem _courseScheme = null!;

    // ── Gewichtungsschema-Voreinstellungen: Laden ────────────────────────────

    private void LoadGradingSchemes()
    {
        ClassScheme = new GradingSchemeEditItem(
            _gradingSchemes.GetDefaultForType(GroupType.Class)
                ?? new GradingScheme { GroupType = GroupType.Class, ExamsPercent = 50, ParticipationPercent = 40, OtherPercent = 10 },
            "Klassen", _gradingSchemes, _grading);
        CourseScheme = new GradingSchemeEditItem(
            _gradingSchemes.GetDefaultForType(GroupType.Course)
                ?? new GradingScheme { GroupType = GroupType.Course, ExamsPercent = 60, ParticipationPercent = 30, OtherPercent = 10 },
            "Kurse", _gradingSchemes, _grading);
    }
}

// ── GradingSchemeEditItem (2.3) ────────────────────────────────────────────────

public partial class GradingSchemeEditItem : ObservableObject
{
    private readonly GradingScheme _scheme;
    private readonly IGradingSchemeRepository _repo;
    private readonly GradingService _grading;

    public string Label { get; }

    [ObservableProperty] private double _examsPercent;
    [ObservableProperty] private double _participationPercent;
    [ObservableProperty] private double _otherPercent;
    [ObservableProperty] private string _validationMessage = "";
    [ObservableProperty] private string _statusMessage = "";

    public GradingSchemeEditItem(GradingScheme scheme, string label, IGradingSchemeRepository repo, GradingService grading)
    {
        _scheme = scheme; _repo = repo; _grading = grading;
        Label = label;
        _examsPercent = scheme.ExamsPercent;
        _participationPercent = scheme.ParticipationPercent;
        _otherPercent = scheme.OtherPercent;
    }

    [RelayCommand]
    private void Save()
    {
        _scheme.ExamsPercent = ExamsPercent;
        _scheme.ParticipationPercent = ParticipationPercent;
        _scheme.OtherPercent = OtherPercent;

        var error = _grading.ValidateGradingScheme(_scheme);
        if (error is not null) { ValidationMessage = error; StatusMessage = ""; return; }

        ValidationMessage = "";
        _repo.Save(_scheme);
        StatusMessage = "Gespeichert.";
    }
}