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

namespace FastReport.Controls
{
    internal class ToolStripLineWidthButton : ToolStripDropDownButton
    {
        private Control owner; // not used in Mono/WPF
        private LineWidthControl selector;
        
        public event EventHandler WidthSelected;

        public float LineWidth
        {
            get => selector.LineWidth;
            set => selector.LineWidth = value;
        }

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

        private void UpdateDpiDependencies()
        {
            selector.Size = selector.LogicalToDevice(new Size(100, 166));
            selector.Font = selector.LogicalToDevice(DrawUtils.DefaultFont);
        }

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

        private class LineWidthControl : ItemSelector
        {
            private float[] stdWidths;

            public float LineWidth
            {
                get => stdWidths[SelectedIndex];
                set
                {
                    for (int i = 0; i < stdWidths.Length; i++)
                    {
                        if (Math.Abs(value - stdWidths[i]) < 1e-4)
                        {
                            SelectedIndex = i;
                            break;
                        }
                    }
                }
            }

            protected override void DrawItem(Graphics g, Rectangle rect, int index)
            {
                using (Pen pen = new Pen(Color.Black, Owner.LogicalToDevice(stdWidths[index])))
                {
                    int _3 = Owner.LogicalToDevice(3);
                    int _6 = Owner.LogicalToDevice(6);
                    int lineWidth = Owner.LogicalToDevice(60) + (index >= 4 ? 1 : 0);
                    g.DrawLine(pen, rect.Left + _3, rect.Top + rect.Height / 2, rect.Left + lineWidth, rect.Top + rect.Height / 2);
                    TextRenderer.DrawText(g, stdWidths[index].ToString(), Font, new Point(rect.Left + lineWidth + _6, rect.Top + _3), SystemColors.WindowText);
                }
            }

            public LineWidthControl(Control owner) : base(owner)
            {
                stdWidths = new float[] { 0.25f, 0.5f, 1, 1.5f, 2, 3, 4, 5 };
                ItemsCount = stdWidths.Length;
                ItemHeight = 20;
            }
        }
    }
}