using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.Reflection;

namespace ModpackUpdater;

public class AppUpdater
{
    private class UpdateInfo
    {
        [JsonConverter(typeof(VersionConverter))]
        public Version Version { get; set; }
        public string DownloadUrl { get; set; }
    }

    private const string UPDATE_URL = "https://git.pilzinsel64.de/gaming/minecraft/minecraft-modpack-updater/-/snippets/3/raw/main/updates.json";
    private readonly HttpClient httpClient = new();
    private UpdateInfo info;

    public async Task<bool> Check()
    {
        var hasUpdate = false;

        try
        {
            var appVersion = Assembly.GetExecutingAssembly().GetName().Version;
            string result = await httpClient.GetStringAsync(UPDATE_URL);
            info = JsonConvert.DeserializeObject<UpdateInfo>(result);

            if (info is not null && info.Version > appVersion)
                hasUpdate = true;
        }
        catch
        {
        }

        return hasUpdate;
    }

    public async Task Install()
    {
        var client = new HttpClient();
        var tempFileName = Path.GetTempFileName();
        var appFileName = Pilz.IO.Extensions.GetExecutablePath();
        var oldFileName = appFileName + ".old";

        // Delete old file
        try
        {
            File.Delete(oldFileName);
        }
        catch
        {
        }

        // Download the new file
        using (var tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite))
        {
            Stream downloadStream = null;
            try
            {
                downloadStream = await client.GetStreamAsync(info.DownloadUrl);
                await downloadStream.CopyToAsync(tempFileStream);
            }
            catch
            {
            }
            finally
            {
                downloadStream?.Dispose();
            }
        }

        // Replace current application file with new file
        File.Move(appFileName, oldFileName, true);
        File.Move(tempFileName, appFileName);
    }
}