using System;
using Avalonia.Threading;
using Material.Dialog.Commands;
using Material.Dialog.Views;

namespace Material.Dialog.ViewModels
{
    public class TimePickerDialogViewModel : DialogWindowViewModel
    {
        private readonly TimePickerDialog _window;

        public DialogButton PositiveButton { get; internal set; }

        public DialogButton NegativeButton { get; internal set; }

        private ushort _firstField;

        public ushort FirstField
        {
            get => _firstField;
            set
            {
                if (_firstField == value)
                    return;

                if (value > 11)
                {
                    value -= 12;
                    IsAm = false;
                    IsPm = true;
                }

                _firstField = value;
                FirstPanelPointerTransform = $"rotate({_firstField / (double) 12 * 360}deg)";
                OnPropertyChanged();
            }
        }

        private ushort _secondField;

        public ushort SecondField
        {
            get => _secondField;
            set
            {
                if (_secondField == value)
                    return;

                _secondField = value;

                double r = Math.Round(_secondField / (double) 60 * 360);
                SecondPanelPointerTransform = $"rotate({r}deg)";
                OnPropertyChanged();
            }
        }

        private string _firstPanelPointerTransform;

        public string FirstPanelPointerTransform
        {
            get => _firstPanelPointerTransform;
            set
            {
                _firstPanelPointerTransform = value;
                OnPropertyChanged();
            }
        }

        private string _secondPanelPointerTransform;

        public string SecondPanelPointerTransform
        {
            get => _secondPanelPointerTransform;
            set
            {
                _secondPanelPointerTransform = value;
                OnPropertyChanged();
            }
        }

        private bool _isAm = true;

        public bool IsAm
        {
            get => _isAm;
            set
            {
                _isAm = value;
                OnPropertyChanged();
            }
        }

        private bool _isPm;

        public bool IsPm
        {
            get => _isPm;
            set
            {
                _isPm = value;
                OnPropertyChanged();
            }
        }

        private int _carouselIndex;

        public int CarouselIndex
        {
            get => _carouselIndex;
            set
            {
                _carouselIndex = value;
                OnPropertyChanged();
                OnPropertyChanged(nameof(FirstFieldSelected));
                OnPropertyChanged(nameof(SecondFieldSelected));
            }
        }

        public bool FirstFieldSelected
        {
            get => _carouselIndex == 0;
            set
            {
                CarouselIndex = value ? 0 : 1;
                OnPropertyChanged();
            }
        }

        public bool SecondFieldSelected
        {
            get => _carouselIndex == 1;
            set
            {
                CarouselIndex = value ? 1 : 0;
                OnPropertyChanged();
            }
        }

        public TimePickerDialogViewModel(TimePickerDialog dialog) : base(dialog)
        {
            ButtonClick = new MaterialDialogRelayCommand(OnPressButton, CanPressButton);
        }


        public bool CanPressButton(object args)
        {
            return true;
        }

        public async void OnPressButton(object args)
        {
            var button = args as DialogButton;
            if (button is null)
                return;

            await Dispatcher.UIThread.InvokeAsync(() =>
            {
                var timespan = new TimeSpan(FirstField + (_isAm ? 0 : 12), SecondField, 00);

                var result = new DateTimePickerDialogResult(button.Result, timespan);

                _window.Result = result;
                _window.Close();
            });
        }

        public MaterialDialogRelayCommand ButtonClick { get; }
    }
}