using System.Windows;

using Bloxstrap.Models.SettingTasks.Base;

namespace Bloxstrap.Models.SettingTasks
{
    public class EmojiModPresetTask : EnumBaseTask<EmojiType>
    {
        private string _filePath => Path.Combine(Paths.Modifications, @"content\fonts\TwemojiMozilla.ttf");

        private IEnumerable<KeyValuePair<EmojiType, string>>? QueryCurrentValue()
        {
            if (!File.Exists(_filePath))
                return null;

            using var fileStream = File.OpenRead(_filePath);
            string hash = MD5Hash.Stringify(App.MD5Provider.ComputeHash(fileStream));

            return EmojiTypeEx.Hashes.Where(x => x.Value == hash);
        }

        public EmojiModPresetTask() : base("ModPreset", "EmojiFont")
        {
            var query = QueryCurrentValue();

            if (query is not null)
                OriginalState = query.FirstOrDefault().Key;
        }

        public override async void Execute()
        {
            const string LOG_IDENT = "EmojiModPresetTask::Execute";

            var query = QueryCurrentValue();

            if (NewState != EmojiType.Default && (query is null || query.FirstOrDefault().Key != NewState))
            {
                try
                {
                    var response = await App.HttpClient.GetAsync(NewState.GetUrl());

                    response.EnsureSuccessStatusCode();

                    Directory.CreateDirectory(Path.GetDirectoryName(_filePath)!);

                    await using var fileStream = new FileStream(_filePath, FileMode.CreateNew);
                    await response.Content.CopyToAsync(fileStream);

                    OriginalState = NewState;
                }
                catch (Exception ex)
                {
                    App.Logger.WriteException(LOG_IDENT, ex);

                    Frontend.ShowConnectivityDialog(
                        String.Format(Strings.Dialog_Connectivity_UnableToConnect, "GitHub"),
                        $"{Strings.Menu_Mods_Presets_EmojiType_Error}\n\n{Strings.Dialog_Connectivity_TryAgainLater}",
                        MessageBoxImage.Warning,
                        ex
                    );
                }
            }
            else if (query is not null && query.Any())
            {
                Filesystem.AssertReadOnly(_filePath);
                File.Delete(_filePath);

                OriginalState = NewState;
            }
        }
    }
}