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

namespace UI
{
    public class RoundTextBox : UserControl
    {
        private TextBox _textBox = null!;
        public int Radius { get; set; } = 4;
        public Color BorderColor { get; set; } = Color.LightGray;
        public Color FocusColor { get; set; } = Color.Blue;
        private bool _focused;

        public bool ReadOnly
        {
            get => _textBox.ReadOnly;
            set => _textBox.ReadOnly = value;
        }
        public char PasswordChar
        {
            get => _textBox.PasswordChar;
            set => _textBox.PasswordChar = value;
        }

        // ── Adiciona isso aqui ──
        public int SelectionStart
        {
            get => _textBox.SelectionStart;
            set => _textBox.SelectionStart = value;
        }
        public new event KeyEventHandler? KeyDown
        {
            add => _textBox.KeyDown += value;
            remove => _textBox.KeyDown -= value;
        }

        public bool Multiline
        {
            get => _textBox.Multiline;
            set
            {
                _textBox.Multiline = value;
                _textBox.ScrollBars = value ? ScrollBars.Vertical : ScrollBars.None;
                AjustarTextBox();
            }
        }

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

        public new Color BackColor
        {
            get => base.BackColor;
            set { base.BackColor = value; if (_textBox != null) _textBox.BackColor = value; }
        }

        //public RoundTextBox()
        //{
        //    DoubleBuffered = true;
        //    base.BackColor = Color.White;
        //    _textBox = new TextBox
        //    {
        //        BorderStyle = BorderStyle.None,
        //        Font = new Font("Segoe UI", 9f),
        //        Location = new Point(6, 6),
        //        Width = Width - 12,
        //        Height = Height - 12,
        //        BackColor = Color.White
        //    };
        //    _textBox.GotFocus += (s, e) => { _focused = true; Invalidate(); };
        //    _textBox.LostFocus += (s, e) => { _focused = false; Invalidate(); };
        //    Controls.Add(_textBox);
        //    SizeChanged += (s, e) => AjustarTextBox();
        //}
        public RoundTextBox()
        {
            DoubleBuffered = true;
            base.BackColor = Color.White;
            _textBox = new TextBox
            {
                BorderStyle = BorderStyle.None,
                Font = new Font("Segoe UI", 9f),
                Location = new Point(6, 6),
                Width = Width - 12,
                Height = Height - 12,
                BackColor = Color.White
            };

            _textBox.GotFocus += (s, e) => { _focused = true; Invalidate(); };
            _textBox.LostFocus += (s, e) => { _focused = false; Invalidate(); };
            _textBox.TextChanged += (s, e) => OnTextChanged(e);  // ← adiciona essa
            _textBox.Leave += (s, e) => OnLeave(e);         // ← e essa

            Controls.Add(_textBox);
            SizeChanged += (s, e) => AjustarTextBox();
        }

        // Ajusta largura e altura do TextBox interno conforme Multiline
        private void AjustarTextBox()
        {
            _textBox.Width = Width - 12;
            _textBox.Height = _textBox.Multiline ? Height - 12 : _textBox.PreferredHeight;
            // Recentraliza verticalmente quando não é multiline
            if (!_textBox.Multiline)
                _textBox.Location = new Point(6, (Height - _textBox.PreferredHeight) / 2);
            else
                _textBox.Location = new Point(6, 6);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            using var path = GetPath(new Rectangle(0, 0, Width - 1, Height - 1), Radius);
            using var brush = new SolidBrush(BackColor);
            e.Graphics.FillPath(brush, path);
            using var pen = new Pen(_focused ? FocusColor : BorderColor, _focused ? 1.5f : 1f);
            e.Graphics.DrawPath(pen, path);
        }

        private static GraphicsPath GetPath(Rectangle r, int rad)
        {
            var path = new GraphicsPath();
            int d = rad * 2;
            path.AddArc(r.X, r.Y, d, d, 180, 90);
            path.AddArc(r.Right - d, r.Y, d, d, 270, 90);
            path.AddArc(r.Right - d, r.Bottom - d, d, d, 0, 90);
            path.AddArc(r.X, r.Bottom - d, d, d, 90, 90);
            path.CloseFigure();
            return path;
        }
    }

    public class RoundButton : Button
    {
        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn(int nL, int nT, int nR, int nB, int nW, int nH);

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 8, 8));
            FlatStyle = FlatStyle.Flat;
            FlatAppearance.BorderSize = 0;
        }
    }
}