using System;
using System.IO;
using System.IO.Compression;
using System.Net;
using System.Text;

namespace FNZCM.ConHost.Ver2
{
    internal static class ExtensionMethods
    {
        public static string SecondsToHumanRead(this int seconds)
        {
            var s = TimeSpan.FromSeconds(seconds);
            if (s.TotalHours < 1) return $"{ Math.Floor(s.TotalMinutes):00}:{s.Seconds:00}";
            return $"{ Math.Floor(s.TotalHours):00}:{ s.Minutes:00}:{s.Seconds:00}";
        }

        public static void WriteM3U8Header(this StringBuilder me)
        {
            me.AppendLine("#EXTM3U");
            me.AppendLine("#EXTENC: UTF-8");
        }

        public static string UrlEscape(this string input)
        {
            if (input == null) return null;
            return input
                .Replace("[", "%5B")
                .Replace("]", "%5D")
                .Replace("'", "%27")
                .Replace(" ", "%20")
                .Replace("#", "%23")
                ;
        }

        public static string FormatDuration(this int second)
        {
            var sbd = new StringBuilder();
            var ts = TimeSpan.FromSeconds(second);
            if (ts.TotalHours > 1) sbd.Append($"{ts.TotalHours:00}:");
            sbd.Append($"{ts.Minutes:00}:{ts.Seconds:00}");
            return sbd.ToString();
        }

        public static string FormatFileSize(this long length)
        {
            string[] sizes = { "B", "KB", "MB", "GB", "TB" };
            double len = length;
            int order = 0;
            while (len >= 1024 && order < sizes.Length - 1)
            {
                order++;
                len = len / 1024;
            }

            // Adjust the format string to your preferences. For example "{0:0.#}{1}" would
            // show a single decimal place, and no space.
            string result = $"{len:000.00} {sizes[order]}";
            return result;
        }

        public static void WriteTextUtf8(this HttpListenerContext context, string content, string contentType = Const.TextHtml)
        {
            var bytes = Encoding.UTF8.GetBytes(content);
            context.Response.ContentEncoding = Encoding.UTF8;
            context.Response.ContentType = contentType;

            if (true == context.Request.Headers["Accept-Encoding"]?.Contains("gzip"))
            {
                context.Response.AddHeader("Content-Encoding", "gzip");

                var memoryStream = new MemoryStream(bytes);
                var gZipStream = new GZipStream(context.Response.OutputStream, CompressionMode.Compress, false);
                memoryStream.CopyTo(gZipStream);
                gZipStream.Flush();
            }
            else
            {
                context.Response.OutputStream.Write(bytes);
            }

        }
    }
}