using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using Indy.IL2CPU.Plugs;

namespace Indy.IL2CPU.CustomImplementation.System {
	[Plug(Target = typeof(String))]
	public static class StringImpl {
		[MethodAlias(Name = "System.String System.String.FastAllocateString(System.Int32)")]
		[PlugMethod(Enabled = false)]
		public static String FastAllocateString(int aLength) {
			Char[] xItems = new Char[aLength];
			return new String(xItems);
		}

		[MethodAlias(Name = "System.Void System.String..ctor(System.Char[],System.Int32,System.Int32)")]
		[PlugMethod(Enabled = false)]
		public static void Ctor(String aThis, [FieldAccess(Name = "$$Storage$$")]ref Char[] aStorage, Char[] aChars, int aStartIndex, int aLength) {
			Char[] newChars = new Char[aLength];
			Array.Copy(aChars, aStartIndex, newChars, 0, aLength);
			aStorage = newChars;
		}

		[MethodAlias(Name = "System.Void System.String..ctor(System.Char[])")]
		[PlugMethod(Enabled = false)]
		public static void Ctor(String aThis, [FieldAccess(Name = "$$Storage$$")] ref Char[] aStorage, Char[] aChars) {
			aStorage = aChars;
		}

		public static string Format(object aFormatProvider, string aFormat, object[] aArgs) {
			string[] xStrings = new string[1 + 2 + (aArgs.Length * 7) - 1];
			xStrings[0] = aFormat;
			xStrings[1] = "(";
			for (int i = 0; i < aArgs.Length; i++) {
				xStrings[2 + (i *7)] = "Param";
				xStrings[3 + (i *7)] = i.ToString();
				xStrings[4 + (i *7)] = "=";
				xStrings[5 + (i *7)] = "\"";
				xStrings[6 + (i * 7)] = aArgs[i].ToString();
				xStrings[7 + (i * 7)] = "\"";
				if (i < (aArgs.Length - 1)) {
					xStrings[8 + (i * 7)] = ",";
				}
			}
			xStrings[xStrings.Length - 1] = ")";
			return String.Concat(xStrings);
		}

		public static int IndexOf(string aThis, char c) {
			for (int i = 0; i < aThis.Length; i++) {
				if (aThis[i] == c) {
					return i;
				}
			}
			return -1;
		}

		public static string Substring(string aThis, int startpos) {
			char[] cs = new char[aThis.Length - startpos];

			int j = 0;
			for (int i = startpos; i < aThis.Length; i++)
				cs[j++] = aThis[i];

			return new string(cs);
		}

		public static string Substring(string aThis, int startpos, int length) {
			if (startpos + length > aThis.Length)
				length = aThis.Length - startpos;

			char[] cs = new char[length];

			int j = 0;
			for (int i = startpos; i < startpos + length; i++)
				cs[j++] = aThis[i];

			return new string(cs);
		}

		// HACK: We need to redo this once char support is complete (only returns 0, -1).
		public static int CompareTo(string aThis, string other) {
			if (aThis.Length != other.Length)
				return -1;
			for (int i = 0; i < aThis.Length; i++)
				if (aThis[i] != other[i])
					return -1;
			return 0;
		}

		[PlugMethod(Enabled = false)]
		public static uint GetStorage(string aString) {
			return 0;
		}
	}
}