using FastReport.Utils;
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace FastReport.Controls
{
    internal class ToolStripLineStyleButton : ToolStripDropDownButton
    {
        private Control owner; // not used in Mono/WPF
        private LineStyleControl selector;
        
        public event EventHandler StyleSelected;

        public LineStyle LineStyle
        {
            get => selector.LineStyle;
            set => selector.LineStyle = value;
        }

        private void selector_ItemSelected(object sender, EventArgs e)
        {
            DropDown.Close();
            if (StyleSelected != null)
                StyleSelected(this, EventArgs.Empty);
        }

        private void UpdateDpiDependencies()
        {
            selector.Size = selector.LogicalToDevice(new Size(100, 127));
        }

        public ToolStripLineStyleButton(Control owner)
        {
            this.owner = owner;
            DisplayStyle = ToolStripItemDisplayStyle.Image;
            ImageAlign = ContentAlignment.MiddleLeft;
            if (!Config.IsRunningOnMono)
            {
                // better looking in Mono/Win. WPF will override this size
                AutoSize = false;
                Size = new Size(32, 22);
            }

            selector = new LineStyleControl(owner);
            selector.ItemSelected += selector_ItemSelected;
            DropDown = new FRToolStripDropDown(selector);
            DropDown.Opening += (s, e) => UpdateDpiDependencies();
        }

        private class LineStyleControl : ItemSelector
        {
            private LineStyle[] styles;

            public LineStyle LineStyle
            {
                get => (LineStyle)SelectedIndex;
                set => SelectedIndex = (int)value;
            }

            protected override void DrawItem(Graphics g, Rectangle rect, int index)
            {
                using (Pen pen = new Pen(Color.Black, Owner.LogicalToDevice(2)))
                {
                    int y = rect.Top + rect.Height / 2;
                    int _2 = Owner.LogicalToDevice(2);
                    if (styles[index] == LineStyle.Double)
                    {
                        y -= _2;
                        g.DrawLine(pen, rect.Left + _2, y, rect.Right - _2, y);
                        y += _2 + _2;
                    }
                    else
                    {
                        pen.DashStyle = (DashStyle)styles[index];
                    }
                    g.DrawLine(pen, rect.Left + _2, y, rect.Right - _2, y);
                }
            }

            public LineStyleControl(Control owner) : base(owner)
            {
                styles = new LineStyle[] { LineStyle.Solid, LineStyle.Dash, LineStyle.Dot, LineStyle.DashDot, LineStyle.DashDotDot, LineStyle.Double };
                ItemsCount = styles.Length;
                ItemHeight = 20;
            }
        }
    }
}