using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Attributes.Jobs;
using BenchmarkDotNet.Running;
using System.IO;
using System.Text.RegularExpressions;
using System.Xml.Linq;
using System.Xml.Serialization;

namespace Benchmark
{
    //// * Summary *

    //BenchmarkDotNet=v0.10.14, OS=Windows 10.0.17134
    //Intel Core i7 CPU 920 2.67GHz(Nehalem), 1 CPU, 8 logical and 4 physical cores
    //Frequency=2610645 Hz, Resolution=383.0471 ns, Timer=TSC
    //  [Host]     : .NET Framework 4.7.1 (CLR 4.0.30319.42000), 32bit LegacyJIT-v4.7.3131.0
    //  DefaultJob : .NET Framework 4.7.1 (CLR 4.0.30319.42000), 32bit LegacyJIT-v4.7.3131.0


    //           Method |      Mean |    Error |    StdDev | Scaled | ScaledSD |
    //----------------- |----------:|---------:|----------:|-------:|---------:|
    //         UseRegex |  93.30 ms | 1.843 ms | 1.6333 ms |   1.00 |     0.00 |
    //      UseLinq2Xml | 100.67 ms | 1.931 ms | 2.3715 ms |   1.08 |     0.03 |
    // UseXmlSerializer | 133.20 ms | 1.013 ms | 0.7911 ms |   1.43 |     0.02 |


    //Regexが一番早いのかぁ。。。
    //Linq2Xmlはこのくらいの差なら見易さ的に選択したい
    //XmlSerializerは1.4倍となると選択しにくいか クラス定義も面倒だし。。
    //  StringReader分が不利なのかもしれないが今回はstringからやりたかったので

    class Program
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<ChatBenchmark>();

            //var c = new ChatBenchmark();
            //var r1 = c.UseRegex();
            //var r2 = c.UseXmlSerializer();
            //var r3 = c.UseLinq2Xml();
        }
    }

    //[ShortRunJob]
    public class ChatBenchmark
    {
        // chatからno vpos user_id 本文を読み取る

        string chat = @"<chat thread=""1234567890"" no=""12"" vpos=""123456"" date=""12345678"" date_usec=""12345"" user_id=""1234567"" locale=""ja-jp"">コメント</chat>";
        int count = 10_000;


        [Benchmark(Baseline = true)]
        public int UseRegex()
        {
            var accum = 0;

            for(var i = 0; i < count; i++)
            {
                var no = int.Parse(Regex.Match(chat, "no=\"(.*?)\"").Groups[1].Value);
                var vpos = long.Parse(Regex.Match(chat, "vpos=\"(.*?)\"").Groups[1].Value);
                var id = Regex.Match(chat, "user_id=\"(.*?)\"").Groups[1].Value;
                var comment = Regex.Match(chat, ">(.*)<").Groups[1].Value;

                accum += no;
            }

            return accum;
        }

        [Benchmark]
        public int UseLinq2Xml()
        {
            var accum = 0;

            for(var i = 0; i < count; i++)
            {
                var element = XElement.Parse(chat);
                var no = int.Parse(element.Attribute("no").Value);
                var vpos = long.Parse(element.Attribute("vpos").Value);
                var id = element.Attribute("no").Value;
                var comment = element.FirstNode.ToString();

                accum += no;
            }

            return accum;
        }

        [Benchmark]
        public int UseXmlSerializer()
        {
            var accum = 0;
            var serializer = new XmlSerializer(typeof(Chat));

            for(var i = 0; i < count; i++)
            {
                var c = serializer.Deserialize(new StringReader(chat)) as Chat;

                accum += c.No;
            }

            return accum;
        }
        [XmlRoot("chat")]
        public class Chat
        {
            [XmlAttribute("no")] public int No { get; set; }
            [XmlAttribute("vpos")] public long Vpos { get; set; }
            [XmlAttribute("user_id")] public string UserId { get; set; }
            [XmlText] public string Text { get; set; }
        }
    }
}