using System;
using System.Drawing;
using System.Windows.Forms;
using GeoSigmaDrawLib;

namespace GeoSigma.SigmaDrawerStyle
{
    /// <summary>
    /// 符号列表
    /// </summary>
    public class MarkListBox : ListBox
    {
        private int padding = 2;
        private int itemHeight = 24;

        public event Action<string> LineTypeSelected;

        /// <summary>
        /// Initializes a new instance of the <see cref="MarkListBox"/> class.
        /// </summary>
        public MarkListBox()
        {
            this.DrawMode = DrawMode.OwnerDrawFixed;
            this.ItemHeight = itemHeight;

            if (GeoSigmaWellPoleXY.GetCurveFillSymbolNames(out string[] names))
            {
                this.Items.AddRange(names);
            }
        }

        /// <inheritdoc/>
        protected override void OnSelectedIndexChanged(EventArgs e)
        {
            base.OnSelectedIndexChanged(e);

            if (SelectedIndex >= 0 && SelectedIndex < Items.Count)
            {
                LineTypeSelected?.Invoke(SelectedItem.ToString());
            }
        }

        /// <inheritdoc/>
        protected override void OnDrawItem(DrawItemEventArgs e)
        {
            if (e.Index < 0 || e.Index >= Items.Count)
            {
                return;
            }

            string name = Items[e.Index].ToString();
            Rectangle bounds = e.Bounds;

            // 绘制背景（包括选中效果）
            e.DrawBackground();

            // 设置图标和文字区域
            int iconSize = bounds.Height - (2 * padding);
            Rectangle imageRect = new Rectangle(bounds.Left + padding, bounds.Top + padding, iconSize, iconSize);
            Rectangle textRect = new Rectangle(imageRect.Right + padding, bounds.Top, bounds.Width - imageRect.Width - (3 * padding), bounds.Height);

            // 绘制图标
            using (Bitmap bitmap = GetBitmap(name, imageRect.Width, imageRect.Height))
            {
                if (bitmap != null)
                {
                    e.Graphics.DrawImage(bitmap, imageRect);
                }
            }

            // 绘制文字
            TextRenderer.DrawText(
                e.Graphics,
                name,
                this.Font,
                textRect,
                (e.State & DrawItemState.Selected) != 0 ? SystemColors.HighlightText : this.ForeColor,
                TextFormatFlags.VerticalCenter | TextFormatFlags.Left);

            // 绘制焦点框
            e.DrawFocusRectangle();
        }

        private Bitmap GetBitmap(string name, int width, int height)
        {
            Bitmap bitmap = new Bitmap(width, height);
            using (Graphics image = Graphics.FromImage(bitmap))
            {
                IntPtr hdc = image.GetHdc();
                bool success = false;

                try
                {
                    success = GeoSigmaWellPoleXY.GetDrawCurveFillSymbol(name, hdc, width, height);
                }
                finally
                {
                    image.ReleaseHdc(hdc);
                }

                if (!success)
                {
                    bitmap.Dispose();
                    return null;
                }
            }

            return bitmap;
        }
    }
}