using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Reflection;
using System.Windows.Forms;
using System.ComponentModel;

namespace CPM.Datetimepicker
{
    [ToolboxItem(true)]
    public class LV_DATETIMEPICKER : DateTimePicker
    {
        // Aparência
        private Color skinColor = Color.MediumSlateBlue;
        private Color textColor = Color.White;
        private Color borderColor = Color.PaleVioletRed;
        private int borderSize = 0;

        // Auxiliares
        private bool droppedDown = false;
        private Image calendarIcon;
        private RectangleF iconButtonArea;
        private const int calendarIconWidth = 34;
        private const int arrowIconWidth = 17;

        public LV_DATETIMEPICKER()
        {
            SetStyle(ControlStyles.UserPaint, true);
            MinimumSize = new Size(0, 35);
            Font = new Font(Font.Name, 9.5F);

            calendarIcon =
                LoadEmbeddedImage("Imagens.calendarWhite.png")
                ?? SystemIcons.Information.ToBitmap();
        }

        // 🔹 Propriedades públicas
        public Color SkinColor
        {
            get => skinColor;
            set
            {
                skinColor = value;

                // Troca automática de ícone conforme o fundo
                calendarIcon =
                    skinColor.GetBrightness() >= 0.6F
                    ? LoadEmbeddedImage("Imagens.calendarDark.png")
                    : LoadEmbeddedImage("Imagens.calendarWhite.png")
                    ?? SystemIcons.Information.ToBitmap();

                Invalidate();
            }
        }

        public Color TextColor
        {
            get => textColor;
            set { textColor = value; Invalidate(); }
        }

        public Color BorderColor
        {
            get => borderColor;
            set { borderColor = value; Invalidate(); }
        }

        public int BorderSize
        {
            get => borderSize;
            set { borderSize = value; Invalidate(); }
        }

        // 🔹 Eventos
        protected override void OnDropDown(EventArgs e)
        {
            base.OnDropDown(e);
            droppedDown = true;
            Invalidate();
        }

        protected override void OnCloseUp(EventArgs e)
        {
            base.OnCloseUp(e);
            droppedDown = false;
            Invalidate();
        }

        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            base.OnKeyPress(e);
            e.Handled = true;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.SmoothingMode = SmoothingMode.AntiAlias;

            using var penBorder = new Pen(borderColor, borderSize) { Alignment = PenAlignment.Inset };
            using var skinBrush = new SolidBrush(skinColor);
            using var textBrush = new SolidBrush(textColor);
            using var openBrush = new SolidBrush(Color.FromArgb(50, 64, 64, 64));
            using var format = new StringFormat { LineAlignment = StringAlignment.Center };

            RectangleF client = new RectangleF(0, 0, Width - 0.5F, Height - 0.5F);
            RectangleF iconArea = new RectangleF(client.Width - calendarIconWidth, 0, calendarIconWidth, client.Height);

            // Fundo
            g.FillRectangle(skinBrush, client);

            // Texto
            g.DrawString("   " + Text, Font, textBrush, client, format);

            // Ícone
            if (calendarIcon != null)
            {
                g.DrawImage(calendarIcon,
                    Width - calendarIcon.Width - 9,
                    (Height - calendarIcon.Height) / 2);
            }

            // Destaque quando aberto
            if (droppedDown)
                g.FillRectangle(openBrush, iconArea);

            // Borda
            if (borderSize > 0)
                g.DrawRectangle(penBorder, client.X, client.Y, client.Width, client.Height);
        }

        protected override void OnHandleCreated(EventArgs e)
        {
            base.OnHandleCreated(e);

            int iconWidth = GetIconButtonWidth();
            iconButtonArea = new RectangleF(Width - iconWidth, 0, iconWidth, Height);
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            Cursor = iconButtonArea.Contains(e.Location) ? Cursors.Hand : Cursors.Default;
        }

        // 🔹 Métodos privados
        private int GetIconButtonWidth()
        {
            int textWidth = TextRenderer.MeasureText(Text, Font).Width;
            return textWidth <= Width - (calendarIconWidth + 20)
                ? calendarIconWidth
                : arrowIconWidth;
        }

        private Image LoadEmbeddedImage(string relativePath)
        {
            var asm = Assembly.GetExecutingAssembly();
            var resourceName = $"{asm.GetName().Name}.{relativePath}";

            using var stream = asm.GetManifestResourceStream(resourceName);
            return stream != null ? Image.FromStream(stream) : null;
        }
    }
}