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

namespace CPM
{
    /// <summary>
    /// ComboBox customizado do sistema LevelOS.
    /// Segue o mesmo padrão visual do LV_TEXTBOX1.
    /// </summary>
    public class LV_COMBOBOX : UserControl
    {
        // ── CAMPOS INTERNOS ───────────────────────────────────────────────────
        private ComboBox _combo;
        private bool _isFocused = false;

        // ── PROPRIEDADES VISUAIS ──────────────────────────────────────────────
        private Color _borderColor = Color.FromArgb(226, 232, 240);
        private Color _borderFocusColor = Color.FromArgb(37, 99, 235);
        private Color _arrowColor = Color.FromArgb(100, 116, 139);
        private int _borderRadius = 6;
        private int _borderSize = 1;

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

        public Color BorderFocusColor
        {
            get => _borderFocusColor;
            set { _borderFocusColor = value; Invalidate(); }
        }

        public Color ArrowColor
        {
            get => _arrowColor;
            set { _arrowColor = value; Invalidate(); }
        }

        public int BorderRadius
        {
            get => _borderRadius;
            set { _borderRadius = value; Invalidate(); }
        }

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

        // ── PROPRIEDADES DO COMBOBOX ──────────────────────────────────────────
        public ComboBoxStyle DropDownStyle
        {
            get => _combo.DropDownStyle;
            set => _combo.DropDownStyle = value;
        }

        public System.Windows.Forms.ComboBox.ObjectCollection Items => _combo.Items;

        public object? SelectedItem
        {
            get => _combo.SelectedItem;
            set => _combo.SelectedItem = value;
        }

        public int SelectedIndex
        {
            get => _combo.SelectedIndex;
            set => _combo.SelectedIndex = value;
        }

        public string Text
        {
            get => _combo.Text;
            set => _combo.Text = value;
        }

        public override Font Font
        {
            get => base.Font;
            set
            {
                base.Font = value;
                _combo.Font = value;
                AjustarAltura();
            }
        }

        public new bool Enabled
        {
            get => base.Enabled;
            set
            {
                base.Enabled = value;
                _combo.Enabled = value;
                BackColor = value ? Color.White : Color.FromArgb(241, 245, 249);
                Invalidate();
            }
        }

        // ── EVENTOS REPASSADOS ────────────────────────────────────────────────
        public event EventHandler? SelectedIndexChanged
        {
            add => _combo.SelectedIndexChanged += value;
            remove => _combo.SelectedIndexChanged -= value;
        }

        public new event EventHandler? TextChanged
        {
            add => _combo.TextChanged += value;
            remove => _combo.TextChanged -= value;
        }

        // ── CONSTRUTOR ────────────────────────────────────────────────────────
        public LV_COMBOBOX()
        {
            _combo = new ComboBox
            {
                DropDownStyle = ComboBoxStyle.DropDownList,
                FlatStyle = FlatStyle.Flat,
                Font = new Font("Segoe UI", 9f),
                BackColor = Color.White,
                ForeColor = Color.FromArgb(30, 41, 59),
                Dock = DockStyle.None,
                IntegralHeight = false
            };

            // Configura o controle pai
            Padding = new Padding(8, 0, 30, 0); // espaço para seta customizada
            BackColor = Color.White;
            ForeColor = Color.FromArgb(30, 41, 59);
            Font = new Font("Segoe UI", 9f);
            Size = new Size(200, 36);
            DoubleBuffered = true;

            Controls.Add(_combo);
            AjustarAltura();

            // Eventos de foco
            _combo.GotFocus += (s, e) => { _isFocused = true; Invalidate(); };
            _combo.LostFocus += (s, e) => { _isFocused = false; Invalidate(); };

            // Propaga clique na área do controle para o combo
            this.Click += (s, e) => _combo.Focus();

            _combo.DropDown += (s, e) => Invalidate();
            _combo.DropDownClosed += (s, e) => Invalidate();
        }

        // ── AJUSTE DE ALTURA ──────────────────────────────────────────────────
        private void AjustarAltura()
        {
            int altura = _combo.PreferredHeight;
            this.Height = altura + 10;
            _combo.Width = this.Width - 38; // reserva espaço para seta
            _combo.Left = 8;
            _combo.Top = (this.Height - _combo.Height) / 2;
        }

        // ── RESIZE ────────────────────────────────────────────────────────────
        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            _combo.Width = this.Width - 38;
            _combo.Left = 8;
            _combo.Top = (this.Height - _combo.Height) / 2;
            Invalidate();
        }

        // ── PAINT ─────────────────────────────────────────────────────────────
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            var g = e.Graphics;
            g.SmoothingMode = SmoothingMode.AntiAlias;

            var cor = _isFocused ? _borderFocusColor : _borderColor;
            var rect = new Rectangle(0, 0, Width - 1, Height - 1);
            var bgRect = new Rectangle(1, 1, Width - 2, Height - 2);

            // Fundo
            using var bgBrush = new SolidBrush(Enabled ? BackColor : Color.FromArgb(241, 245, 249));
            g.FillRoundedRectangle(bgBrush, bgRect, _borderRadius);

            // Borda
            using var pen = new Pen(cor, _borderSize);
            g.DrawRoundedRectangle(pen, rect, _borderRadius);

            // Seta customizada
            DesenharSeta(g);
        }

        private void DesenharSeta(Graphics g)
        {
            int arrowX = Width - 22;
            int arrowY = Height / 2;

            using var brush = new SolidBrush(_isFocused ? _borderFocusColor : _arrowColor);
            var pontos = new Point[]
            {
                new Point(arrowX - 5, arrowY - 3),
                new Point(arrowX + 5, arrowY - 3),
                new Point(arrowX,     arrowY + 4)
            };
            g.FillPolygon(brush, pontos);
        }
    }

    // ── EXTENSÕES DE GRAPHICS PARA ROUNDED RECT ───────────────────────────────
    internal static class GraphicsExtensions
    {
        public static void FillRoundedRectangle(this Graphics g, Brush brush, Rectangle rect, int radius)
        {
            using var path = GetRoundedPath(rect, radius);
            g.FillPath(brush, path);
        }

        public static void DrawRoundedRectangle(this Graphics g, Pen pen, Rectangle rect, int radius)
        {
            using var path = GetRoundedPath(rect, radius);
            g.DrawPath(pen, path);
        }

        private static GraphicsPath GetRoundedPath(Rectangle rect, int radius)
        {
            int r = Math.Min(radius, Math.Min(rect.Width, rect.Height) / 2);
            var d = r * 2;
            var path = new GraphicsPath();
            path.AddArc(rect.X, rect.Y, d, d, 180, 90);
            path.AddArc(rect.Right - d, rect.Y, d, d, 270, 90);
            path.AddArc(rect.Right - d, rect.Bottom - d, d, d, 0, 90);
            path.AddArc(rect.X, rect.Bottom - d, d, d, 90, 90);
            path.CloseFigure();
            return path;
        }
    }
}