using System;
using System.Globalization;
using System.Runtime.InteropServices;

namespace INetMock.Client.IntegrationTest
{
    internal static class DockerEndpoint
    {
        private const string DockerHostEnvName = "DOCKER_HOST";
        private const string DockerTlsVerifyEnvName = "DOCKER_TLS_VERIFY";

        internal static string DetermineFromEnv() => DetermineEndpoint(
            Environment.GetEnvironmentVariable(DockerHostEnvName),
            Environment.GetEnvironmentVariable(DockerTlsVerifyEnvName)
        );

        internal static string DetermineEndpoint(string? dockerHost, string? tlsVerify)
        {
            dockerHost ??= "";
            var dockerTlsVerify = int.TryParse(tlsVerify, out var verify) && verify == 1;
            var isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
            return (dockerHost, dockerTlsVerify, isWindows) switch
            {
                ("", _, true) => "npipe://./pipe/docker_engine",
                ("", _, false) => "unix:/var/run/docker.sock",
                (_, false, _) => dockerHost,
                (var h, true, _) when h.StartsWith("tcp") => h.Replace(
                    "tcp",
                    "https",
                    true,
                    CultureInfo.InvariantCulture),
                _ => "",
            };
        }
    }
}