using System;
using System.Text.RegularExpressions;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;

namespace Benchmark
{
    [MemoryDiagnoser]
    //[SimpleJob(RuntimeMoniker.Net472, baseline: true)]
    [SimpleJob(RuntimeMoniker.NetCoreApp31)]
    [SimpleJob(RuntimeMoniker.NetCoreApp50)]
    public class IdentityParser
    {
        private const string TestIdentity = "ABZ0000001-1";
        private char[] TestIdentityChars;

        private readonly Regex _regex = new Regex(@"^(\w{3,})(\d{7})-(\d+)$", RegexOptions.Compiled);

        [GlobalSetup]
        public void GlobalSetup()
        {
            TestIdentityChars = TestIdentity.ToCharArray();
        }

        [Benchmark]
        public Identity? ParseWithRegex()
        {
            var match = _regex.Match(TestIdentity);
            if (!match.Success) return default;
            var prefix = match.Groups[1].Value;
            var index = int.Parse(match.Groups[2].Value);
            var revision = int.Parse(match.Groups[2].Value);
            return new Identity(prefix, index, revision);
        }

        [Benchmark]
        public Identity? ParseWithoutRegex()
        {
            return Identity.TryParse(TestIdentity, out var identity) ? identity : default(Identity?);
        }

        [Benchmark]
        public Identity? ParseWithSpanT()
        {
            return Identity.TryParse(TestIdentityChars, out var identity) ? identity : default(Identity?);
        }
    }
}