using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using WPFDark.Internals;

namespace WPFDark.Controls
{
    public class BiaButtonBase : FrameworkElement
    {
        public static readonly RoutedEvent ClickEvent =
            EventManager.RegisterRoutedEvent(nameof(Click), RoutingStrategy.Bubble,
                typeof(RoutedEventHandler), typeof(BiaButtonBase));

        public event RoutedEventHandler Click
        {
            add => AddHandler(ClickEvent, value);
            remove => RemoveHandler(ClickEvent, value);
        }

        #region Command

        public ICommand? Command
        {
            get => _Command;
            set
            {
                if (value != _Command)
                    SetValue(CommandProperty, value);
            }
        }

        private ICommand? _Command;

        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register(nameof(Command), typeof(ICommand), typeof(BiaButtonBase),
                new PropertyMetadata(
                    default(ICommand),
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;

                        if (self._Command != null)
                            self._Command.CanExecuteChanged -= self.CommandOnCanExecuteChanged;

                        self._Command = (ICommand) e.NewValue;

                        if (self._Command != null)
                            self._Command.CanExecuteChanged += self.CommandOnCanExecuteChanged;

                        self.CommandOnCanExecuteChanged(null, EventArgs.Empty);
                    }));

        private void CommandOnCanExecuteChanged(object? sender, EventArgs e)
        {
            if (Command != null)
                IsEnabled = Command.CanExecute(CommandParameter);
        }

        #endregion

        #region CommandParameter

        public object? CommandParameter
        {
            get => _CommandParameter;
            set
            {
                if (value != _CommandParameter)
                    SetValue(CommandParameterProperty, value);
            }
        }

        private object? _CommandParameter;

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(nameof(CommandParameter), typeof(object), typeof(BiaButtonBase),
                new PropertyMetadata(
                    default,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._CommandParameter = e.NewValue;
                    }));

        #endregion

        #region Background

        public Brush? Background
        {
            get => _Background;
            set
            {
                if (value != _Background)
                    SetValue(BackgroundProperty, value);
            }
        }

        private Brush? _Background;

        public static readonly DependencyProperty BackgroundProperty =
            DependencyProperty.Register(nameof(Background), typeof(Brush), typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(
                    default(Brush),
                    FrameworkPropertyMetadataOptions.AffectsRender |
                    FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._Background = (Brush) e.NewValue;
                    }));

        #endregion

        #region Foreground

        public Brush? Foreground
        {
            get => _Foreground;
            set
            {
                if (value != _Foreground)
                    SetValue(ForegroundProperty, value);
            }
        }

        private Brush? _Foreground;

        public static readonly DependencyProperty ForegroundProperty =
            DependencyProperty.Register(nameof(Foreground), typeof(Brush), typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(
                    default(Brush),
                    FrameworkPropertyMetadataOptions.AffectsRender |
                    FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._Foreground = (Brush) e.NewValue;
                    }));

        #endregion

        #region CornerRadius

        public double CornerRadius
        {
            get => _CornerRadius;
            set
            {
                if (NumberHelper.AreClose(value, _CornerRadius) == false)
                    SetValue(CornerRadiusProperty, value);
            }
        }

        private double _CornerRadius;

        public static readonly DependencyProperty CornerRadiusProperty =
            DependencyProperty.Register(nameof(CornerRadius), typeof(double), typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(
                    0.0,
                    FrameworkPropertyMetadataOptions.AffectsRender |
                    FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._CornerRadius = (double) e.NewValue;
                    }));

        #endregion

        #region IsPressed

        public bool IsPressed
        {
            get => _IsPressed;
            set
            {
                if (value != _IsPressed)
                    SetValue(IsPressedProperty, value);
            }
        }

        private bool _IsPressed;

        public static readonly DependencyProperty IsPressedProperty =
            DependencyProperty.Register(nameof(IsPressed), typeof(bool), typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(
                    false,
                    FrameworkPropertyMetadataOptions.AffectsRender |
                    FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._IsPressed = (bool) e.NewValue;
                    }));

        #endregion

        #region IsPressedMouseOver

        public bool IsPressedMouseOver
        {
            get => _isPressedMouseOver;
            set
            {
                if (value != _isPressedMouseOver)
                    SetValue(IsPressedMouseOverProperty, value);
            }
        }

        private bool _isPressedMouseOver;

        public static readonly DependencyProperty IsPressedMouseOverProperty =
            DependencyProperty.Register(nameof(IsPressedMouseOver), typeof(bool), typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(
                    false,
                    FrameworkPropertyMetadataOptions.AffectsRender |
                    FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender,
                    (s, e) =>
                    {
                        var self = (BiaButtonBase) s;
                        self._isPressedMouseOver = (bool) e.NewValue;
                    }));

        #endregion

        static BiaButtonBase()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(BiaButtonBase),
                new FrameworkPropertyMetadata(typeof(BiaButtonBase)));
        }

        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            base.OnMouseLeftButtonDown(e);

            IsPressed = IsInMouse(e);

            CaptureMouse();

            e.Handled = true;
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            IsPressedMouseOver = IsInMouse(e);

            e.Handled = true;
        }

        protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
        {
            base.OnMouseLeftButtonUp(e);

            if (IsPressed == false)
                return;

            if (IsMouseCaptured)
                ReleaseMouseCapture();

            IsPressed = false;

            if (IsInMouse(e) == false)
                return;

            Clicked();

            e.Handled = true;
        }

        private bool IsInMouse(MouseEventArgs e)
        {
            var pos = e.GetPosition(this);

            return
                pos.X >= 0.0 &&
                pos.X <= ActualWidth &&
                pos.Y >= 0.0 &&
                pos.Y <= ActualHeight;
        }

        protected virtual void Clicked()
        {
            InvokeClicked();
        }

        protected virtual void InvokeClicked()
        {
            RaiseEvent(new RoutedEventArgs(ClickEvent, this));

            Command?.ExecuteIfCan(CommandParameter);
        }
    }
}