using System;
using System.Runtime.CompilerServices;

#if LOCALTEST
namespace System_.Text {
#else
namespace System.Text {
#endif
	public sealed class StringBuilder {

		private const int defaultMaxCapacity = int.MaxValue;
		private const int defaultInitialCapacity = 16;

		private int length;
		private int capacity;
		private char[] data;

		#region Constructors

		public StringBuilder() : this(defaultInitialCapacity, defaultMaxCapacity) { }

		public StringBuilder(int initialCapacity) : this(initialCapacity, defaultMaxCapacity) { }

		public StringBuilder(int initialCapacity, int maxCapacity) {
			this.capacity = Math.Max(initialCapacity, 2);
			this.length = 0;
			this.data = new char[this.capacity];
		}

		public StringBuilder(string value)
			: this((value != null) ? value.Length : defaultInitialCapacity, defaultMaxCapacity) {
			if (value != null) {
				this.Append(value);
			}
		}

		public StringBuilder(string value, int initialCapacity)
			: this(initialCapacity, defaultMaxCapacity) {
			if (value != null) {
				this.Append(value);
			}
		}

		public StringBuilder(string value, int startIndex, int length, int initialCapacity)
			: this(initialCapacity, defaultMaxCapacity) {
			if (value == null) {
				value = string.Empty;
			}
			if (startIndex < 0 || length < 0 || startIndex + length > value.Length) {
				throw new ArgumentOutOfRangeException();
			}
			this.Append(value, startIndex, length);
		}

		#endregion

		public override string ToString() {
			return new string(this.data, 0, this.length);
		}

		public string ToString(int startIndex, int length) {
			if (startIndex < 0 || length < 0 || startIndex + length > this.length) {
				throw new ArgumentOutOfRangeException();
			}
			return new string(this.data, startIndex, length);
		}

		private void EnsureSpace(int space) {
			if (this.length + space > this.capacity) {
				do {
					this.capacity <<= 1;
				} while (this.capacity < this.length + space);
				char[] newData = new char[capacity];
				Array.Copy(this.data, 0, newData, 0, this.length);
				this.data = newData;
			}
		}

		public int Length {
			get {
				return this.length;
			}
			set {
				if (value < 0) {
					throw new ArgumentOutOfRangeException();
				}
				if (value > this.length) {
					this.EnsureSpace(this.length - value);
					for (int i = this.length; i < value; i++) {
						this.data[i] = '\x0000';
					}
				}
				this.length = value;
			}
		}

		public int Capacity {
			get {
				return this.capacity;
			}
		}

		[IndexerName("Chars")]
		public char this[int index] {
			get {
				if (index < 0 || index >= this.length) {
					throw new IndexOutOfRangeException();
				}
				return this.data[index];
			}
			set {
				if (index < 0 || index >= this.length) {
					throw new IndexOutOfRangeException();
				}
				this.data[index] = value;
			}
		}

		public void CopyTo(int srcIndex, char[] dst, int dstIndex, int count) {
			if (dst == null) {
				throw new ArgumentNullException("destination");
			}
			if (srcIndex < 0 || count < 0 || dstIndex < 0 ||
				srcIndex + count > this.length || dstIndex + count > dst.Length) {
				throw new ArgumentOutOfRangeException();
			}
			Array.Copy(this.data, srcIndex, dst, dstIndex, count);
		}

		public void EnsureCapacity(int capacity) {
			if (this.capacity < capacity) {
				// This is not quite right, as it will often over-allocate memory
				this.EnsureSpace(capacity - this.capacity);
			}
		}

		public StringBuilder Remove(int startIndex, int length) {
			if (startIndex < 0 || length < 0 || startIndex + length > this.length) {
				throw new ArgumentOutOfRangeException();
			}
			Array.Copy(this.data, startIndex + length, this.data, startIndex, this.length - length - startIndex);
			this.length -= length;
			return this;
		}

		#region Append Methods

		public StringBuilder Append(string value) {
			int len = value.Length;
			this.EnsureSpace(len);
			for (int i = 0; i < len; i++) {
				this.data[this.length++] = value[i];
			}
			return this;
		}

		public StringBuilder Append(string value, int startIndex, int count) {
			if (value == null) {
				return this;
			}
			if (startIndex < 0 || count < 0 || value.Length < startIndex + count) {
				throw new ArgumentOutOfRangeException();
			}
			this.EnsureSpace(count);
			for (int i = 0; i < count; i++) {
				this.data[this.length++] = value[startIndex + i];
			}
			return this;
		}

		public StringBuilder Append(char value) {
			EnsureSpace(1);
			data[length++] = value;
			return this;
		}

		public StringBuilder Append(char value, int repeatCount) {
			if (repeatCount < 0) {
				throw new ArgumentOutOfRangeException();
			}
			EnsureSpace(repeatCount);
			for (int i = 0; i < repeatCount; i++) {
				this.data[this.length++] = value;
			}
			return this;
		}

		public StringBuilder Append(char[] value) {
			if (value == null) {
				return this;
			}
			int addLen = value.Length;
			this.EnsureSpace(addLen);
			Array.Copy(value, 0, this.data, this.length, addLen);
			this.length += addLen;
			return this;
		}

		public StringBuilder Append(char[] value, int startIndex, int charCount) {
			if (value == null) {
				return this;
			}
			if (charCount < 0 || startIndex < 0 || value.Length < (startIndex + charCount)) {
				throw new ArgumentOutOfRangeException();
			}
			this.EnsureSpace(charCount);
			Array.Copy(value, startIndex, this.data, this.length, charCount);
			this.length += charCount;
			return this;
		}

		public StringBuilder Append(object value) {
			if (value == null) {
				return this;
			}
			return Append(value.ToString());
		}

		public StringBuilder Append(bool value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(byte value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(decimal value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(double value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(short value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(int value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(long value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(sbyte value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(float value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(ushort value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(uint value) {
			return Append(value.ToString());
		}

		public StringBuilder Append(ulong value) {
			return Append(value.ToString());
		}

		#endregion

		#region AppendFormat Methods

		public StringBuilder AppendFormat(string format, object obj0) {
			StringHelper.FormatHelper(this, null, format, obj0);
			return this;
		}

		public StringBuilder AppendFormat(string format, object obj0, object obj1) {
			StringHelper.FormatHelper(this, null, format, obj0, obj1);
			return this;
		}

		public StringBuilder AppendFormat(string format, object obj0, object obj1, object obj2) {
			StringHelper.FormatHelper(this, null, format, obj0, obj1, obj2);
			return this;
		}

		public StringBuilder AppendFormat(string format, params object[] objs) {
			StringHelper.FormatHelper(this, null, format, objs);
			return this;
		}

		public StringBuilder AppendFormat(IFormatProvider provider, string format, params object[] objs) {
			StringHelper.FormatHelper(this, provider, format, objs);
			return this;
		}

		#endregion

		#region AppendLine Methods

		public StringBuilder AppendLine() {
			return this.Append(Environment.NewLine);
		}

		public StringBuilder AppendLine(string value) {
			return this.Append(value).Append(Environment.NewLine);
		}

		#endregion

		#region Insert Methods

		public StringBuilder Insert(int index, string value) {
			if (index < 0 || index > this.length) {
				throw new ArgumentOutOfRangeException();
			}
			if (string.IsNullOrEmpty(value)) {
				return this;
			}
			int len = value.Length;
			EnsureSpace(len);
			Array.Copy(this.data, index, this.data, index + len, this.length - index);
			for (int i = 0; i < len; i++) {
				this.data[index + i] = value[i];
			}
			this.length += len;
			return this;
		}

		public StringBuilder Insert(int index, bool value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, byte value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, char value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, char[] value) {
			return this.Insert(index, new string(value));
		}

		public StringBuilder Insert(int index, decimal value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, double value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, short value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, int value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, long value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, object value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, sbyte value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, float value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, ushort value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, uint value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, ulong value) {
			return this.Insert(index, value.ToString());
		}

		public StringBuilder Insert(int index, string value, int count) {
			if (count < 0) {
				throw new ArgumentOutOfRangeException();
			}
			if (count == 0 || string.IsNullOrEmpty(value)) {
				return this;
			}
			StringBuilder toInsert = new StringBuilder(value.Length * count);
			for (; count > 0; count--) {
				toInsert.Append(value);
			}
			return this.Insert(index, toInsert.ToString());
		}

		public StringBuilder Insert(int index, char[] value, int startIndex, int charCount) {
			if (value == null && (startIndex != 0 || charCount != 0)) {
				throw new ArgumentNullException("value");
			}
			if (startIndex < 0 || charCount < 0 || startIndex + charCount > value.Length) {
				throw new ArgumentOutOfRangeException();
			}
			return this.Insert(index, new string(value, startIndex, charCount));
		}

		#endregion

		#region Replace Methods

		public StringBuilder Replace(char oldChar, char newChar) {
			return this.Replace(oldChar, newChar, 0, this.length);
		}

		public StringBuilder Replace(string oldValue, string newValue) {
			return this.Replace(oldValue, newValue, 0, this.length);
		}

		public StringBuilder Replace(char oldChar, char newChar, int startIndex, int count) {
			if (startIndex < 0 || count < 0 || startIndex + count > this.length) {
				throw new ArgumentOutOfRangeException();
			}
			for (int i = 0; i < count; i++) {
				if (this.data[startIndex + i] == oldChar) {
					this.data[startIndex + i] = newChar;
				}
			}
			return this;
		}

		public StringBuilder Replace(string oldValue, string newValue, int startIndex, int count) {
			string subStr = this.ToString(startIndex, count);
			subStr = subStr.Replace(oldValue, newValue);
			this.Remove(startIndex, count);
			this.Insert(startIndex, subStr);
			return this;
		}

		#endregion
	}
}