using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;

namespace BizHawk
{
    public struct Tuple<T1,T2> : IEquatable<Tuple<T1, T2>>
    {
        private readonly T1 first;
        private readonly T2 second;
        public T1 First { get { return first; } }
        public T2 Second { get { return second; } }

        public Tuple(T1 o1, T2 o2)
        {
            first = o1;
            second = o2;
        }

        public bool Equals(Tuple<T1, T2> other)
        {
            return first.Equals(other.first) &&
            second.Equals(other.second);
        }

        public override bool Equals(object obj)
        {
            if (obj is Tuple<T1, T2>)
                    return this.Equals((Tuple<T1, T2>)obj);
            else
                    return false;
        }

        public override int GetHashCode()
        {
            return first.GetHashCode() ^ second.GetHashCode();
        }
    }

    public static class Extensions
    {
        public static bool IsBinary(this string str)
        {
            for (int i = 0; i < str.Length; i++)
            {
                char c = str[i];
                if (c == '0' || c == '1')
                    continue;
                return false;
            }
            return true;
        }

        public static bool In(this string str, params string[] options)
        {
            foreach (string opt in options)
            {
                if (opt.Equals(str, StringComparison.CurrentCultureIgnoreCase)) return true;
            }
            return false;
        }

        public static bool In(this string str, IEnumerable<string> options)
        {
            foreach (string opt in options)
            {
                if (opt.Equals(str,StringComparison.CurrentCultureIgnoreCase)) return true;
            }
            return false;
        }

        public static bool In<T>(this string str, IEnumerable<T> options, Func<T, string, bool> eval)
        {
            foreach (T opt in options)
            {
                if (eval(opt, str) == true)
                    return true;
            }
            return false;
        }

        public static bool NotIn(this string str, params string[] options)
        {
            foreach (string opt in options)
            {
                if (opt.ToLower() == str.ToLower()) return false;
            }
            return true;
        }

        public static bool NotIn(this string str, IEnumerable<string> options)
        {
            foreach (string opt in options)
            {
                if (opt.ToLower() == str.ToLower()) return false;
            }
            return true;
        }
        
        public static bool In(this int i, params int[] options)
        {
            foreach (int j in options)
            {
                if (i == j) return true;
            }
            return false;
        }

        public static bool In(this int i, IEnumerable<int> options)
        {
            foreach (int j in options)
            {
                if (i == j) return true;
            }
            return false;
        }

        public static bool ContainsStartsWith(this IEnumerable<string> options, string str)
        {
            foreach (string opt in options)
            {
                if (opt.StartsWith(str)) return true;
            }
            return false;
        }

        public static string GetOptionValue(this IEnumerable<string> options, string str)
        {
            try
            {
                foreach (string opt in options)
                {
                    if (opt.StartsWith(str))
                    {
                        return opt.Split('=')[1];
                    }
                }
            }
            catch (Exception) { }
            return null;
        }

        public static bool IsValidRomExtentsion(this string str, params string[] romExtensions)
        {
            string strUpper = str.ToUpper();
            foreach (string ext in romExtensions)
            {
                if (strUpper.EndsWith(ext.ToUpper())) return true;
            }
            return false;
        }

        public static string ToCommaSeparated(this List<string> list)
        {
            var sb = new StringBuilder();
            for (int i = 0; i < list.Count; i++)
            {
                if (i > 0) sb.Append(",");
                sb.Append(list[i]);
            }
            return sb.ToString();
        }

        public static void SaveAsHex(this byte[] buffer, TextWriter writer)
        {
            for (int i=0; i<buffer.Length; i++)
            {
                writer.Write("{0:X2}", buffer[i]);
            }
            writer.WriteLine();
        }

        public static void SaveAsHex(this byte[] buffer, TextWriter writer, int length)
        {
            for (int i = 0; i < length; i++)
            {
                writer.Write("{0:X2}", buffer[i]);
            }
            writer.WriteLine();
        }

        public static void SaveAsHex(this short[] buffer, TextWriter writer)
        {
            for (int i = 0; i < buffer.Length; i++)
            {
                writer.Write("{0:X4}", buffer[i]);
            }
            writer.WriteLine();
        }

        public static void SaveAsHex(this ushort[] buffer, TextWriter writer)
        {
            for (int i = 0; i < buffer.Length; i++)
            {
                writer.Write("{0:X4}", buffer[i]);
            }
            writer.WriteLine();
        }

        public static void ReadFromHex(this byte[] buffer, string hex)
        {
            if (hex.Length % 2 != 0)
                throw new Exception("Hex value string does not appear to be properly formatted.");
            for (int i=0; i<buffer.Length && i*2<hex.Length; i++)
            {
                string bytehex = "" + hex[i*2] + hex[i*2 + 1];
                buffer[i] = byte.Parse(bytehex, NumberStyles.HexNumber);
            }
        }

        public static void ReadFromHex(this short[] buffer, string hex)
        {
            if (hex.Length % 4 != 0)
                throw new Exception("Hex value string does not appear to be properly formatted.");
            for (int i = 0; i < buffer.Length && i * 4 < hex.Length; i++)
            {
                string shorthex = "" + hex[i * 4] + hex[(i * 4) + 1] + hex[(i * 4) + 2] + hex[(i * 4) + 3];
                buffer[i] = short.Parse(shorthex, NumberStyles.HexNumber);
            }
        }

        public static void ReadFromHex(this ushort[] buffer, string hex)
        {
            if (hex.Length % 4 != 0)
                throw new Exception("Hex value string does not appear to be properly formatted.");
            for (int i = 0; i < buffer.Length && i * 4 < hex.Length; i++)
            {
                string ushorthex = "" + hex[i*4] + hex[(i*4)+1] + hex[(i*4)+2] + hex[(i*4)+3];
                buffer[i] = ushort.Parse(ushorthex, NumberStyles.HexNumber);
            }
        }
    }

    public static class Colors
    {
        public static int ARGB(byte red, byte green, byte blue)
        {
            return (int) ((uint)((red << 0x10) | (green << 8) | blue | (0xFF << 0x18)));
        }

        public static int ARGB(byte red, byte green, byte blue, byte alpha)
        {
            return (int) ((uint)((red << 0x10) | (green << 8) | blue | (alpha << 0x18)));
        }

        public static int Luminosity(byte lum)
        {
            return (int)((uint)((lum << 0x10) | (lum << 8) | lum | (0xFF << 0x18)));
        }
    }

    public static class Util
    {
        public static int SaveRamBytesUsed(byte[] SaveRAM)
        {
            for (int j = SaveRAM.Length - 1; j >= 0; j--)
                if (SaveRAM[j] != 0)
                    return j + 1;
            return 0;
        }

		/// <summary>
		/// conerts bytes to an uppercase string of hex numbers in upper case without any spacing or anything
		/// </summary>
		public static string BytesToHexString(byte[] bytes)
		{
			StringBuilder sb = new StringBuilder();
			foreach (byte b in bytes)
				sb.AppendFormat("{0:X2}", b);
			return sb.ToString();
		}

    }


}