using System;
using System.Reflection;
using Microsoft.AspNetCore.Hosting;

namespace Landmark.OLA.Application
{
    public interface IStatus
    {
        string Application { get; }
        DateTime CurrentDate { get; }
        string BuildVersion { get; }
        DateTime BuildDate { get; }
        string Environment { get; }
    }

    public class Status : IStatus
    {
        public string Application => _env.ApplicationName;
        public DateTime CurrentDate => DateTime.Now;
        public string BuildVersion => Assembly.GetExecutingAssembly().GetName().Version.ToString();
        public DateTime BuildDate => AssemblyBuildDate();
        public string Environment => _env.EnvironmentName;

        private readonly IWebHostEnvironment _env;

        public Status(IWebHostEnvironment env)
        {
            _env = env;
        }

        public static DateTime AssemblyBuildDate()
        {
            //https://stackoverflow.com/a/804310/266594
            //TODO #246: Look up this value at start up to avoid hitting the filesystem repeatedly
            Assembly assembly = Assembly.GetExecutingAssembly();
            System.IO.FileInfo fileInfo = new(assembly.Location);
            DateTime lastModified = fileInfo.LastWriteTime;

            return lastModified;
        }

    }
}