using System;
using System.Web;
using System.Text;

namespace CustomerManagement.css
{
    /// <summary>
    /// Summary description for svg
    /// </summary>
    public class svg : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "image/svg+xml";

            string str = Input.GetQueryString<string>("stops");
            string[] values = str.Split(new Char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

            var sb = new StringBuilder();
            sb.Append("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"100%\" height=\"100%\">");
            sb.AppendLine();
            sb.Append("<defs>");
            sb.AppendLine();
            sb.Append("<linearGradient id=\"linear-gradient\" x1=\"0%\" y1=\"0%\" x2=\"0%\" y2=\"100%\">");
            sb.AppendLine();

            foreach (var val in values)
            {
                string[] items = val.Split(new Char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
                sb.Append("<stop offset=\"" + items[1] + "\" stop-color=\"" + items[0] + "\" stop-opacity=\"1\"/>");
                sb.AppendLine();                
            }

            sb.Append("</linearGradient>");
            sb.AppendLine();
            sb.Append("</defs>");
            sb.AppendLine();
            sb.Append("<rect width=\"100%\" height=\"100%\" fill=\"url(#linear-gradient)\"/>");
            sb.AppendLine();
            sb.Append("</svg>");
            sb.AppendLine();

            context.Response.Write(sb.ToString());
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

    public static class Input
    {
        public static T GetQueryString<T>(string key) where T : IConvertible
        {
            T result = default(T);

            if (String.IsNullOrEmpty(HttpContext.Current.Request.QueryString[key]) == false)
            {
                string value = HttpContext.Current.Request.QueryString[key];

                try
                {
                    result = (T)Convert.ChangeType(value, typeof(T));
                }
                catch
                {
                    //Could not convert.  Pass back default value...
                    result = default(T);
                }
            }

            return result;
        }
    }
}