using System.ComponentModel;
using System.Windows;
using System.Windows.Media;
using static Bro.Common.Helper.EnumHelper;

namespace Bro.Common.ImageCanvas.Shapes
{
    public abstract class ShapeElementBase : DrawingVisual, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int Index { get; set; }

        #region Draw
        public void Draw()
        {
            if (Pen == null)
            {
                SetNormalPen();
            }

            //Application.Current.Dispatcher.Invoke(() =>
            //{
            using (DrawingContext dc = RenderOpen())
            {
                DrawShape(dc);
            }
            //});
        }

        protected abstract void DrawShape(DrawingContext dc);
        #endregion

        #region 画笔相关
        #region 绘图画笔
        private Pen pen = null;
        public Pen Pen
        {
            get => pen;
            set => SetAndDraw(ref pen, value);
        }

        public virtual void SetNormalPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.Black), 3);
        }

        public virtual void SetHoverPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.BlueViolet), 10);
        }

        public virtual void SetInSidePen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.YellowGreen), 6);
        }

        public virtual void SetSelectedPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.Pink), 10);
        }

        protected virtual void SetMeasureDoneOKPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.Green), 6);
        }

        protected virtual void SetMeasureDoneNGPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.Red), 6);
        }

        protected virtual void SetMeasuringPen()
        {
            Pen = new Pen(new SolidColorBrush(Colors.Yellow), 3);
        }
        #endregion

        #region 文字画笔
        /// <summary>
        /// 字体大小
        /// </summary>
        public virtual float FontSize { get; set; } = 30;
        /// <summary>
        /// 字体和基元的距离
        /// </summary>
        public virtual int FontDistance { get; set; } = 5;

        public virtual bool IsShowRemark { get; set; } = true;

        public string Text { get; set; }

        public virtual Typeface Typeface { get; set; } = new Typeface(new FontFamily("宋体"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
        #endregion
        #endregion

        #region 鼠标位置判断
        protected abstract bool IsMouseInSide(Point point);
        protected abstract bool IsMouseHover(Point point);
        #endregion

        #region 状态
        private ElementState state = ElementState.New;
        public ElementState State
        {
            get
            {
                return state;
            }
            set
            {
                if (state != value)
                {
                    state = value;

                    switch (state)
                    {
                        case ElementState.MouseHover:
                            SetHoverPen();
                            break;
                        case ElementState.MouseInSide:
                            SetInSidePen();
                            break;
                        case ElementState.Selected:
                            SetSelectedPen();
                            break;
                        case ElementState.Normal:
                            SetNormalPen();
                            break;
                        case ElementState.Measuring:
                            SetMeasuringPen();
                            break;
                        case ElementState.MeasureDoneOK:
                            SetMeasureDoneOKPen();
                            break;
                        case ElementState.MeasureDoneNG:
                            SetMeasureDoneNGPen();
                            break;
                    }
                }
            }
        }

        /// <summary>
        /// 是否是运行模式
        /// </summary>
        [Browsable(false)]
        public RunMode RunMode { get; set; } = RunMode.SetMode;

        public virtual void CheckMouseState(Point point)
        {
            if (State != ElementState.Selected)
            {
                if (IsMouseInSide(point))
                {
                    State = ElementState.MouseInSide;
                }
                else if (IsMouseHover(point))
                {
                    State = ElementState.MouseHover;
                }
                else
                {
                    State = ElementState.Normal;
                }
            }
        }
        #endregion

        #region 变化导致重绘事件
        protected void SetAndDraw<T>(ref T field, T value)
        {
            if (value != null)
            {
                if (!value.Equals(field))
                {
                    field = value;
                    Draw();
                }
            }
        }
        #endregion
    }
}