using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;

namespace Sog
{
    public class JsonUtils
    {
        private static string TrimSpace(string json)
        {
            int i = 0, j = 0;
            while (json[i] != '\0')
            {
                if (json[i] == ' ')
                {
                    json.Replace(json[j++], json[i]);
                }
                i++;
            }

            return json;
        }
        private static string indent(int num)
        {
            string result = "";
            for (int i = 0; i < num; i++)
            {
                result += "    ";
            }
            return result;
        }

        public static string FormatJson(string json)
        {
            json.Trim(' ');
            string result = "";
            int length = json.Length;
            int number = 0;
            char key;
            for (int i = 0; i < length; i++)
            {
                key = json[i];
                if (key == '[' || key == '{')
                {
                    if ((i - 1) > 0 && json[i - 1] == ':')
                    {
                        result += '\n';
                        result += indent(number);
                    }

                    result += key;
                    result += '\n';
                    number++;
                    result += indent(number);
                    continue;
                }

                if (key == ']' || key == '}')
                {
                    if ((i - 1 >= 0) && (json[i - 1] == ']' || json[i - 1] == '}'))
                    {
                        number--;
                        result += indent(number);
                        result += key;
                    }
                    else
                    {
                        result += '\n';
                        number--;

                        result += indent(number);
                        result += key;
                    }

                    if (i + 1 < length && json[i + 1] != ',')
                    {
                        result += '\n';
                    }
                    continue;
                }

                if (key == ',')
                {
                    result += key;
                    result += '\n';
                    result += indent(number);
                    continue;
                }

                result += key;
            }
            return result;
        }
    }
}