using System;
using System.Text;

namespace sharp.json
{
	public class JSONString : JSON
	{
		static System.Tuple<char,char>[] escapeCharacters = {
			System.Tuple.Create('\\','\\'),
			System.Tuple.Create('/','/'),
			System.Tuple.Create('"','"'),
			System.Tuple.Create('b','\b'),
			System.Tuple.Create('f','\f'),
			System.Tuple.Create('n','\n'),
			System.Tuple.Create('r','\r'),
			System.Tuple.Create('t','\t'),
		};

		string value;

		public JSONString()
			:base(JSONTypes.String)
		{
			this.value = "";
		}

		public JSONString(String value)
			:base(JSONTypes.String)
		{
			this.value = value;
		}

		public override string prettyPrint(int d = 0)
		{
			return string.Format("\"{0}\"",escape(value));
		}

		public override string ToString()
		{
			return prettyPrint();
		}

		public static string escape(string source){
			StringBuilder sb = new StringBuilder();
			foreach (char ch in source){
				if ((ch >= 0x20) && (ch < 128)){
					sb.Append(ch);
				} else if (ch < 0x20){
					foreach (Tuple<char,char> repl in escapeCharacters){
						if (repl.Item2 == ch){
							sb.Append("\\");
							sb.Append(repl.Item1);
							break;
						}
					}
				} else {
					int iv = (int)ch;
					sb.Append("\\u");
					sb.Append("____");
					Console.WriteLine("JSON WARNING: UNICODE ESCAPE SEQUENCES ARE NOT IMPLEMENTED YET");
				}
			}
			return sb.ToString();
		}
	}
}