using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using FastReport.Utils;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;

namespace FastReport.Map
{
    /// <summary>
    /// Represents a map point.
    /// </summary>
    public partial class ShapePoint : ShapeBase
    {
        #region Fields
        private PointD point;
        private RectangleF largestBoundsRect;
        #endregion // Fields

        #region Properties
        /// <summary>
        /// Gets or sets the X-coordinate of the point.
        /// </summary>
        public double X
        {
            get { return point.X; }
            set { point.X = value; }
        }

        /// <summary>
        /// Gets or sets the Y-coordinate of the point.
        /// </summary>
        public double Y
        {
            get { return point.Y; }
            set { point.Y = value; }
        }
        #endregion // Properties

        #region Private Methods
        private PointF GetPoint()
        {
            float left = Map.AbsLeft + Map.Padding.Left + Map.OffsetXG;
            float top = Map.AbsTop + Map.Padding.Top + Map.OffsetYG;
            double minX = Layer.Box.MinX;
            double maxY = Layer.Box.MaxY;
            float scale = Map.ScaleG;
            return new PointF(
              left + CoordinateConverter.GetX(point.X + ShapeOffsetX, minX, scale),
              top + CoordinateConverter.GetY(point.Y + ShapeOffsetY, maxY, scale, Map.MercatorProjection));
        }
        #endregion

        #region Public Methods
        /// <inheritdoc/>
        public override void Assign(Base source)
        {
            base.Assign(source);
            ShapePoint src = source as ShapePoint;
            X = src.X;
            Y = src.Y;
        }

        /// <inheritdoc/>
        public override void Draw(FRPaintEventArgs e)
        {
            PointF point = GetPoint();
            point.X *= e.ScaleX;
            point.Y *= e.ScaleY;

            ShapeStyle style = UseCustomStyle ? CustomStyle : Layer.DefaultShapeStyle;
            float size = style.PointSize;

            Pen pen = e.Cache.GetPen(style.BorderColor, 1, DashStyle.Solid);
            Brush brush = e.Cache.GetBrush(style.FillColor);

            // get color & size from the layer's color & size ranges
            if (!IsValueEmpty)
            {
                brush = e.Cache.GetBrush(Layer.ColorRanges.GetColor(Value));
                float rangeSize = Layer.SizeRanges.GetSize(Value);
                if (rangeSize != 0)
                    size = rangeSize;
            }

            DrawDesign(e, ref brush, ref size);

            if (Map.Zoom >= Layer.LabelsVisibleAtZoom)
            {
                e.Graphics.FillAndDrawEllipse(pen, brush, point.X - size / 2, point.Y - size / 2, size, size);
            }
            largestBoundsRect = new RectangleF(point.X - 100, point.Y - 20, 200, 20);
        }

        /// <inheritdoc/>
        public override void DrawLabel(FRPaintEventArgs e)
        {
            ShapeStyle style = UseCustomStyle ? CustomStyle : Layer.DefaultShapeStyle;
            string text = "";
            if (Layer.LabelKind != MapLabelKind.Value)
                text = SpatialData.GetValue(Layer.LabelColumn);
            if (!IsValueEmpty)
            {
                if (Layer.LabelKind == MapLabelKind.NameAndValue || Layer.LabelKind == MapLabelKind.Value)
                    text += "\r\n" + Value.ToString(Layer.LabelFormat);
            }

            Font font = e.Cache.GetFont(style.Font.FontFamily,
              IsPrinting ? style.Font.Size : style.Font.Size * e.ScaleX * 96f / DrawUtils.ScreenDpi,
              style.Font.Style);
            RectangleF textBounds = largestBoundsRect;
            textBounds.Offset(CenterOffsetX * e.ScaleX, CenterOffsetY * e.ScaleY);
            StringFormat format = e.Cache.GetStringFormat(StringAlignment.Center, StringAlignment.Center, StringTrimming.None, StringFormatFlags.NoClip, 0, 0);
            SolidBrush brush = e.Cache.GetBrush(style.TextColor);
            e.Graphics.DrawString(text, font, brush, textBounds, format);
        }

        internal void Load(Stream stream)
        {
            point.Load(stream);
        }

        internal void Save(Stream stream)
        {
            point.Save(stream);
        }

        /// <inheritdoc/>
        public override void Serialize(FRWriter writer)
        {
            ShapePoint c = writer.DiffObject as ShapePoint;
            base.Serialize(writer);

            if (X != c.X)
                writer.WriteDouble("X", X);
            if (Y != c.Y)
                writer.WriteDouble("Y", Y);
        }

        /// <inheritdoc/>
        public override bool HitTest(PointF point)
        {
            PointF pt = GetPoint();
            RectangleF bounds = new RectangleF(pt.X - 16, pt.Y - 16, 16, 16);
            if (bounds.Contains(point))
                return true;
            return false;
        }
        #endregion // Public Methods

        /// <summary>
        /// Initializes a new instance of the <see cref="ShapePoint"/> class.
        /// </summary>
        public ShapePoint()
        {
            point = new PointD();
            BaseName = "Point";
        }
    }
}