using System;
using System.Linq;

namespace BizHawk.Client.Common
{
	public static class StringHelpers
	{
		public static int HowMany(string str, char c)
		{
			if (!String.IsNullOrEmpty(str))
			{
				return str.Count(t => t == c);
			}
			else
			{
				return 0;
			}
		}

		public static int HowMany(string str, string s)
		{
			int count = 0;
			for (int x = 0; x < (str.Length - s.Length); x++)
			{
				if (str.Substring(x, s.Length) == s)
					count++;
			}
			return count;
		}
	}

	//TODO: put it in its own file
	public static class IntHelpers //TODO: a less lame name
	{
		public static int GetNumDigits(Int32 i)
		{
			//if (i == 0) return 0;
			//if (i < 0x10) return 1;
			if (i < 0x100) return 2;
			//if (i < 0x1000) return 3; //adelikat: let's only do even numbers
			if (i < 0x10000) return 4;
			if (i < 0x1000000) return 6;
			else return 8;
		}

		public static uint MaxHexValueFromMaxDigits(Int32 i)
		{
			switch (i)
			{
				case 0:
					return 0;
				case 1:
					return 0xF;
				case 2:
					return 0xFF;
				case 3:
					return 0xFFF;
				case 4:
					return 0xFFFF;
				case 5:
					return 0xFFFFF;
				case 6:
					return 0xFFFFFF;
				case 7:
					return 0xFFFFFFF;
				case 8:
					return 0xFFFFFFFF;
			}

			return int.MaxValue;
		}
    }
}