using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

using Microsoft.PowerToys.Settings.UI.Lib;
using System.ComponentModel;
using System.Runtime.CompilerServices;
// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236

namespace Microsoft.PowerToys.Settings.UI.Controls
{
    public sealed partial class HotkeySettingsControl : UserControl
    {
        public string Header { get; set; }

        public static readonly DependencyProperty HotkeySettingsProperty =
            DependencyProperty.Register(
                "HotkeySettings", 
                typeof(HotkeySettings),
                typeof(HotkeySettingsControl),
                null);

        private HotkeySettings _hotkeySettings;
        public HotkeySettings HotkeySettings 
        { 
            get { return _hotkeySettings; }
            set 
            {
                if (_hotkeySettings != value)
                {
                    _hotkeySettings = value;
                    SetValue(HotkeySettingsProperty, value);
                    HotkeyTextBox.Text = HotkeySettings.ToString();
                }
            } 
        }

        public HotkeySettingsControl()
        {
            this.InitializeComponent();
            HotkeyTextBox.PreviewKeyDown += HotkeyTextBox_KeyDown;
        }

        private static bool IsDown(Windows.System.VirtualKey key)
        {
            return Window.Current.CoreWindow.GetKeyState(key).HasFlag(CoreVirtualKeyStates.Down);
        }

        private void HotkeyTextBox_KeyDown(object sender, KeyRoutedEventArgs e)
        {
            e.Handled = true;
            if (
                e.Key == Windows.System.VirtualKey.LeftWindows ||
                e.Key == Windows.System.VirtualKey.RightWindows ||
                e.Key == Windows.System.VirtualKey.Control ||
                e.Key == Windows.System.VirtualKey.Menu ||
                e.Key == Windows.System.VirtualKey.Shift
                )
            {
                return;
            }

            var settings = new HotkeySettings();
            // Display HotKey value
            if (IsDown(Windows.System.VirtualKey.LeftWindows) || 
                IsDown(Windows.System.VirtualKey.RightWindows))
            {
                settings.win = true;
            }
            if (IsDown(Windows.System.VirtualKey.Control))
            {
                settings.ctrl = true;
            }
            if (IsDown(Windows.System.VirtualKey.Menu))
            {
                settings.alt = true;
            }
            if (IsDown(Windows.System.VirtualKey.Shift))
            {
                settings.shift = true;
            }

            settings.key = e.Key.ToString();

            // TODO: Check that e.OriginalKey is the ScanCode. It is not clear from docs.
            settings.code = (int) e.OriginalKey;
            HotkeySettings = settings;
        }
    }
}