using System;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;

// The 'text' parameter will contain the text from the:
//   - Current Clipboard when run by HotKey
//   - History Item when run from the History Menu
// The returned string will be:
//   - Placed directly on the Clipboard
//   - Ignored by ClipboardFusion if it is 'null'
public static class ClipboardFusionHelper
{
	public static string ProcessText(string text)
	{
        Color c = ParseColor(text);
        String htmlColor = "#" + c.R.ToString("X2", CultureInfo.InvariantCulture) +
                                 c.G.ToString("X2", CultureInfo.InvariantCulture) +
                                 c.B.ToString("X2", CultureInfo.InvariantCulture);
        if (c.A < 255) htmlColor += c.A.ToString("X2", CultureInfo.InvariantCulture);
		return htmlColor;
	}

    public static Color ParseColor(string htmlColor)
    {
        htmlColor = htmlColor.Trim();

        if (htmlColor.StartsWith("rgb")) // rgb or rgba
        {
            int left = htmlColor.IndexOf('(');
            int right = htmlColor.IndexOf(')');

            if (left < 0 || right < 0)
                throw new FormatException("rgba format error");
			
            string noBrackets = htmlColor.Substring(left + 1, right - left - 1);

            string[] parts = noBrackets.Split(',');

            int r = int.Parse(parts[0], CultureInfo.InvariantCulture);
            int g = int.Parse(parts[1], CultureInfo.InvariantCulture);
            int b = int.Parse(parts[2], CultureInfo.InvariantCulture);

            if (parts.Length == 3)
            {
                return Color.FromArgb(r, g, b);
            }
            else if (parts.Length == 4)
            {
                float a = float.Parse(parts[3], CultureInfo.InvariantCulture);
                return Color.FromArgb((int)Math.Round(a * 255), r, g, b);
            }
        }
		else if ((htmlColor[0] == '#') &&
                ((htmlColor.Length == 9) || (htmlColor.Length == 5)))
		{
 			if (htmlColor.Length == 9) 
			{
				string r = htmlColor.Substring(1, 2);
				string g = htmlColor.Substring(3, 2);
				string b = htmlColor.Substring(5, 2);
				string a = htmlColor.Substring(7, 2);
				
				return Color.FromArgb(Convert.ToInt32(a, 16),
									  Convert.ToInt32(r, 16),
									  Convert.ToInt32(g, 16),
									  Convert.ToInt32(b, 16));
			}
			else 
			{
				string r = Char.ToString(htmlColor[1]);
				string g = Char.ToString(htmlColor[2]);
				string b = Char.ToString(htmlColor[3]);
				string a = Char.ToString(htmlColor[4]);
				
				return Color.FromArgb(Convert.ToInt32(a + a, 16),
									  Convert.ToInt32(r + r, 16),
									  Convert.ToInt32(g + g, 16),
									  Convert.ToInt32(b + b, 16));
			}
		}

		return ColorTranslator.FromHtml(htmlColor);
    }
}