using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using System.Threading.Tasks;

namespace Remotely.Server.Services
{
    public interface IUpgradeService
    {
        Version GetCurrentVersion();
        Task<bool> IsNewVersionAvailable();
    }

    public class UpgradeService : IUpgradeService
    {
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly ILogger<UpgradeService> _logger;
        private Version _currentVersion;

        public UpgradeService(IHttpClientFactory httpClientFactory, ILogger<UpgradeService> logger)
        {
            _httpClientFactory = httpClientFactory;
            _logger = logger;
        }

        public Version GetCurrentVersion()
        {
            try
            {
                if (_currentVersion is not null)
                {
                    return _currentVersion;
                }

                var fileVersion = System.Diagnostics.FileVersionInfo.GetVersionInfo("Remotely_Server.dll").FileVersion;
                if (Version.TryParse(fileVersion, out var result))
                {
                    _currentVersion = result;
                    return _currentVersion;
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error while getting current version.");
            }

            _currentVersion = new(1, 0);
            return _currentVersion;
        }
        public async Task<bool> IsNewVersionAvailable()
        {

            try
            {
                using var client = _httpClientFactory.CreateClient();
                var response = await client.GetAsync("https://github.com/immense/Remotely/releases/latest");
                var versionString = response.RequestMessage.RequestUri.ToString().Split("/").Last()[1..];
                var remoteVersion = Version.Parse(versionString);
                var filePath = Directory.GetFiles(Directory.GetCurrentDirectory(), "Remotely_Server.dll", SearchOption.AllDirectories).First();
                var localVersion = Version.Parse(System.Diagnostics.FileVersionInfo.GetVersionInfo(filePath).FileVersion);
                if (remoteVersion > localVersion)
                {
                    return true;
                }
            }
            catch (Exception ex)
            {
                _logger.LogWarning(ex, "Failed to retrieve latest version info.");
            }

            return false;
        }
    }
}