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
{
    // ── Stundenraster: Uhrzeiten je Einzelstunde (4.2.2 Nachtrag) ────────────

    [ObservableProperty] private string _periodTimesError = "";
    [ObservableProperty] private string _periodTimesStatus = "";

    public ObservableCollection<PeriodTimeEditItem> PeriodTimes { get; } = [];

    // ── Stundenraster: Laden / Speichern ─────────────────────────────────────

    private void LoadPeriodTimes()
    {
        PeriodTimes.Clear();
        for (var period = 1; period <= 10; period++)
        {
            var times = _periodSchedule.GetTimes(period);
            PeriodTimes.Add(new PeriodTimeEditItem(period, times?.Start, times?.End));
        }
    }

    [RelayCommand]
    private void SavePeriodTimes()
    {
        PeriodTimesError = ""; PeriodTimesStatus = "";
        var entries = new List<PeriodTimeEntry>();

        foreach (var item in PeriodTimes)
        {
            if (string.IsNullOrWhiteSpace(item.StartText) && string.IsNullOrWhiteSpace(item.EndText))
                continue; // Stunde bewusst nicht konfiguriert — ok, keine Pflicht für alle 10.

            if (!TimeOnly.TryParseExact(item.StartText, "HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, out var start) ||
                !TimeOnly.TryParseExact(item.EndText, "HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, out var end))
            { PeriodTimesError = $"{item.PeriodLabel}: Format HH:MM."; return; }

            if (end <= start)
            { PeriodTimesError = $"{item.PeriodLabel}: Ende muss nach dem Beginn liegen."; return; }

            entries.Add(new PeriodTimeEntry { PeriodNumber = item.PeriodNumber, Start = start, End = end });
        }

        _periodSchedule.SetPeriods(entries);
        PeriodTimesStatus = "Gespeichert.";
    }
}

public partial class PeriodTimeEditItem : ObservableObject
{
    public int    PeriodNumber { get; }
    public string PeriodLabel  { get; }

    [ObservableProperty] private string _startText;
    [ObservableProperty] private string _endText;

    public PeriodTimeEditItem(int periodNumber, TimeOnly? start, TimeOnly? end)
    {
        PeriodNumber = periodNumber;
        PeriodLabel  = $"{periodNumber}. Stunde";
        _startText   = start?.ToString("HH:mm") ?? "";
        _endText     = end?.ToString("HH:mm") ?? "";
    }
}