// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using System.Threading.Tasks;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Database;
using osu.Game.Scoring;
using osu.Game.Graphics.UserInterface;
using osu.Game.Online;
using osuTK;

namespace osu.Game.Screens.Play
{
    public class SaveFailedScoreButton : CompositeDrawable
    {
        private readonly Bindable<DownloadState> state = new Bindable<DownloadState>();

        private readonly Func<Task<ScoreInfo>> importFailedScore;

        private ScoreInfo? importedScore;

        private DownloadButton button = null!;

        public SaveFailedScoreButton(Func<Task<ScoreInfo>> importFailedScore)
        {
            Size = new Vector2(50, 30);

            this.importFailedScore = importFailedScore;
        }

        [BackgroundDependencyLoader]
        private void load(OsuGame? game, Player? player, RealmAccess realm)
        {
            InternalChild = button = new DownloadButton
            {
                RelativeSizeAxes = Axes.Both,
                State = { BindTarget = state },
                Action = () =>
                {
                    switch (state.Value)
                    {
                        case DownloadState.LocallyAvailable:
                            game?.PresentScore(importedScore, ScorePresentType.Gameplay);
                            break;

                        case DownloadState.NotDownloaded:
                            state.Value = DownloadState.Importing;
                            Task.Run(importFailedScore).ContinueWith(t =>
                            {
                                importedScore = realm.Run(r => r.Find<ScoreInfo>(t.GetResultSafely().ID)?.Detach());
                                Schedule(() => state.Value = importedScore != null ? DownloadState.LocallyAvailable : DownloadState.NotDownloaded);
                            });
                            break;
                    }
                }
            };

            if (player != null)
            {
                importedScore = realm.Run(r => r.Find<ScoreInfo>(player.Score.ScoreInfo.ID)?.Detach());
                if (importedScore != null)
                    state.Value = DownloadState.LocallyAvailable;
            }

            state.BindValueChanged(state =>
            {
                switch (state.NewValue)
                {
                    case DownloadState.LocallyAvailable:
                        button.TooltipText = @"watch replay";
                        button.Enabled.Value = true;
                        break;

                    case DownloadState.Importing:
                        button.TooltipText = @"importing score";
                        button.Enabled.Value = false;
                        break;

                    default:
                        button.TooltipText = @"save score";
                        button.Enabled.Value = true;
                        break;
                }
            }, true);
        }
    }
}