// ****************************************************************

// Copyright 2008, Charlie Poole

// This is free software licensed under the NUnit license. You may

// obtain a copy of the license at http://nunit.org.

// ****************************************************************



using System;

using System.Reflection;

using System.Text;



namespace NUnit.Core

{

    public class MethodHelper

    {

        public static string GetDisplayName(MethodInfo method, object[] arglist)

        {

            StringBuilder sb = new StringBuilder(method.Name);



#if NET_2_0

            if (method.IsGenericMethod)

            {

                sb.Append("<");

                int cnt = 0;

                foreach (Type t in method.GetGenericArguments())

                {

                    if (cnt++ > 0) sb.Append(",");

                    sb.Append(t.Name);

                }

                sb.Append(">");

            }

#endif



            if (arglist != null)

            {

                sb.Append("(");



                for (int i = 0; i < arglist.Length; i++)

                {

                    if (i > 0) sb.Append(",");

                    sb.Append(GetDisplayString(arglist[i]));

                }



                sb.Append(")");

            }



            return sb.ToString();

        }



        private static string GetDisplayString(object arg)

        {

            string display = arg == null 

                ? "null" 

                : Convert.ToString( arg, System.Globalization.CultureInfo.InvariantCulture);



            if (arg is double)

            {

                double d = (double)arg;



                if (double.IsNaN(d))

                    display = "double.NaN";

                else if (double.IsPositiveInfinity(d))

                    display = "double.PositiveInfinity";

                else if (double.IsNegativeInfinity(d))

                    display = "double.NegativeInfinity";

                else if (d == double.MaxValue)

                    display = "double.MaxValue";

                else if (d == double.MinValue)

                    display = "double.MinValue";

                else

                {

                    if (display.IndexOf('.') == -1)

                        display += ".0";

                    display += "d";

                }

            }

            else if (arg is float)

            {

                float f = (float)arg;



                if (float.IsNaN(f))

                    display = "float.NaN";

                else if (float.IsPositiveInfinity(f))

                    display = "float.PositiveInfinity";

                else if (float.IsNegativeInfinity(f))

                    display = "float.NegativeInfinity";

                else if (f == float.MaxValue)

                    display = "float.MaxValue";

                else if (f == float.MinValue)

                    display = "float.MinValue";

                else

                {

                    if (display.IndexOf('.') == -1)

                        display += ".0";

                    display += "f";

                }

            }

            else if (arg is decimal)

            {

                decimal d = (decimal)arg;

                if (d == decimal.MinValue)

                    display = "decimal.MinValue";

                else if (d == decimal.MaxValue)

                    display = "decimal.MaxValue";

                else

                    display += "m";

            }

            else if (arg is long)

            {

                long l = (long)arg;

                if (l == long.MinValue)

                    display = "long.MinValue";

                else if (l == long.MinValue)

                    display = "long.MaxValue";

                else

                    display += "L";

            }

            else if (arg is ulong)

            {

                ulong ul = (ulong)arg;

                if (ul == ulong.MinValue)

                    display = "ulong.MinValue";

                else if (ul == ulong.MinValue)

                    display = "ulong.MaxValue";

                else

                    display += "UL";

            }

            else if (arg is string)

            {

                StringBuilder sb = new StringBuilder();

                sb.Append("\"");

                foreach (char c in (string)arg)

                    sb.Append(EscapeControlChar(c));

                sb.Append("\"");

                display = sb.ToString();

            }

            else if (arg is char)

            {

                display = "\'" + EscapeControlChar((char)arg) + "\'";

            }

            else if (arg is int)

            {

                int ival = (int)arg;

                if (ival == int.MaxValue)

                    display = "int.MaxValue";

                else if (ival == int.MinValue)

                    display = "int.MinValue";

            }



            return display;

        }



        private static string EscapeControlChar(char c)

        {

            switch (c)

            {

                case '\'':

                    return "\\\'";

                case '\"':

                    return "\\\"";

                case '\\':

                    return "\\\\";

                case '\0':

                    return "\\0";

                case '\a':

                    return "\\a";

                case '\b':

                    return "\\b";

                case '\f':

                    return "\\f";

                case '\n':

                    return "\\n";

                case '\r':

                    return "\\r";

                case '\t':

                    return "\\t";

                case '\v':

                    return "\\v";



                case '\x0085':

                case '\x2028':

                case '\x2029':

                    return string.Format("\\x{0:X4}", (int)c);



                default:

                    return char.IsControl(c) || (int)c > 128

                        ? string.Format("\\x{0:X4}", (int)c)

                        : c.ToString();

            }

        }

    }

}