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

namespace QVCopier.Components.ProgressBarLabel
{
    public class ProgressBarLabelControl : ProgressBar
    {
        private readonly StringFormat _stringFormat = new() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };

        private ContentAlignment _textAlign = ContentAlignment.MiddleCenter;

        [DefaultValue(ContentAlignment.MiddleCenter), Browsable(true)]
        public virtual ContentAlignment TextAlign
        {
            get => _textAlign;
            set
            {
                _textAlign = value;

                switch (value)
                {
                    case ContentAlignment.TopLeft:
                        _stringFormat.LineAlignment = StringAlignment.Near;
                        _stringFormat.Alignment = StringAlignment.Near;
                        break;

                    case ContentAlignment.TopCenter:
                        _stringFormat.LineAlignment = StringAlignment.Near;
                        _stringFormat.Alignment = StringAlignment.Center;
                        break;

                    case ContentAlignment.TopRight:
                        _stringFormat.LineAlignment = StringAlignment.Near;
                        _stringFormat.Alignment = StringAlignment.Far;
                        break;

                    case ContentAlignment.MiddleLeft:
                        _stringFormat.LineAlignment = StringAlignment.Center;
                        _stringFormat.Alignment = StringAlignment.Near;
                        break;

                    case ContentAlignment.MiddleCenter:
                        _stringFormat.LineAlignment = StringAlignment.Center;
                        _stringFormat.Alignment = StringAlignment.Center;
                        break;

                    case ContentAlignment.MiddleRight:
                        _stringFormat.LineAlignment = StringAlignment.Center;
                        _stringFormat.Alignment = StringAlignment.Far;
                        break;

                    case ContentAlignment.BottomLeft:
                        _stringFormat.LineAlignment = StringAlignment.Far;
                        _stringFormat.Alignment = StringAlignment.Near;
                        break;

                    case ContentAlignment.BottomCenter:
                        _stringFormat.LineAlignment = StringAlignment.Far;
                        _stringFormat.Alignment = StringAlignment.Center;
                        break;

                    case ContentAlignment.BottomRight:
                        _stringFormat.LineAlignment = StringAlignment.Far;
                        _stringFormat.Alignment = StringAlignment.Far;
                        break;

                    default:
                        throw new ArgumentOutOfRangeException(nameof(value), value, null);
                }

                Invalidate();//redraw component after change value from VS Properties section
            }
        }

        [Browsable(true)]
        public override string Text { get => base.Text; set => base.Text = value; }

        public ProgressBarLabelControl()
        {
            Value = Minimum;
            FixComponentBlinking();
        }

        private void FixComponentBlinking()
        {
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
        }

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

            using var brush = new SolidBrush(ForeColor);
            var rect = ClientRectangle;

            ProgressBarRenderer.DrawHorizontalBar(g, rect);

            rect.Inflate(-3, -3);

            var progressBarRect = new Rectangle(rect.X, rect.Y, (int)Math.Round((float)Value / Maximum * rect.Width), rect.Height);

            if (Value > 0)
            {
                g.FillRectangle(brush, progressBarRect);
            }

            if (false == string.IsNullOrWhiteSpace(Text))
            {
                void DrawText(Color c)
                {
                    using var br = new SolidBrush(c);
                    g.DrawString(Text, Font, br, rect, _stringFormat);
                }

                g.SetClip(rect);
                DrawText(ForeColor);
                g.ResetClip();

                g.SetClip(progressBarRect);
                DrawText(BackColor);
                g.ResetClip();
            }
        }
    }
}