using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Security.Cryptography;
using System.Text;
using TurfCS;

namespace OnlineUserPool.Unility
{
    public class CommonHelper
    {
        public static double GetDistances(double lon, double lat, double lon1, double lat1)
        {
            var pt1 = Turf.Point(new double[] { lon, lat });
            var pt2 = Turf.Point(new double[] { lon1, lat1 });

            var value = Turf.Distance(pt1, pt2, "kilometers") * 1000;
            return Math.Round(value, 2);
        }

        public static int GenerateRandomInteger(int min = 0, int max = int.MaxValue)
        {
            var randomNumberBuffer = new byte[10];
            new RNGCryptoServiceProvider().GetBytes(randomNumberBuffer);
            return new Random(BitConverter.ToInt32(randomNumberBuffer, 0)).Next(min, max);
        }

        public static byte[] Compress(string text)
        {
            var bytes = Encoding.UTF8.GetBytes(text);
            return Compress(bytes);
        }

        public static byte[] Compress(byte[] bytes)
        {
            //var bytes = Encoding.Unicode.GetBytes(text);
            using (var mso = new MemoryStream())
            {
                using (var gs = new GZipStream(mso, CompressionMode.Compress))
                {
                    gs.Write(bytes, 0, bytes.Length);
                }
                return mso.ToArray();
            }
        }

        public static string Decompress(byte[] data)
        {
            // Read the last 4 bytes to get the length
            byte[] lengthBuffer = new byte[4];
            Array.Copy(data, data.Length - 4, lengthBuffer, 0, 4);
            int uncompressedSize = BitConverter.ToInt32(lengthBuffer, 0);

            var buffer = new byte[uncompressedSize];
            using (var ms = new MemoryStream(data))
            {
                using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
                {
                    gzip.Read(buffer, 0, uncompressedSize);
                }
            }
            return Encoding.UTF8.GetString(buffer);
        }
    }
}