// 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.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using osu.Framework.Logging;
using osu.Framework.Platform;
using osu.Game.Beatmaps;
using osu.Game.Database;
using osu.Game.IO.Archives;
using osu.Game.Rulesets;
using osu.Game.Scoring.Legacy;

namespace osu.Game.Scoring
{
    public class ScoreModelManager : ArchiveModelManager<ScoreInfo, ScoreFileInfo>
    {
        public override IEnumerable<string> HandledExtensions => new[] { ".osr" };

        protected override string[] HashableFileTypes => new[] { ".osr" };

        protected override string ImportFromStablePath => Path.Combine("Data", "r");

        private readonly RulesetStore rulesets;
        private readonly Func<BeatmapManager> beatmaps;

        public ScoreModelManager(RulesetStore rulesets, Func<BeatmapManager> beatmaps, Storage storage, IDatabaseContextFactory contextFactory, IIpcHost importHost = null)
            : base(storage, contextFactory, new ScoreStore(contextFactory, storage), importHost)
        {
            this.rulesets = rulesets;
            this.beatmaps = beatmaps;
        }

        protected override ScoreInfo CreateModel(ArchiveReader archive)
        {
            if (archive == null)
                return null;

            using (var stream = archive.GetStream(archive.Filenames.First(f => f.EndsWith(".osr", StringComparison.OrdinalIgnoreCase))))
            {
                try
                {
                    return new DatabasedLegacyScoreDecoder(rulesets, beatmaps()).Parse(stream).ScoreInfo;
                }
                catch (LegacyScoreDecoder.BeatmapNotFoundException e)
                {
                    Logger.Log(e.Message, LoggingTarget.Information, LogLevel.Error);
                    return null;
                }
            }
        }

        public Score GetScore(ScoreInfo score) => new LegacyDatabasedScore(score, rulesets, beatmaps(), Files.Store);

        public List<ScoreInfo> GetAllUsableScores() => ModelStore.ConsumableItems.Where(s => !s.DeletePending).ToList();

        public IEnumerable<ScoreInfo> QueryScores(Expression<Func<ScoreInfo, bool>> query) => ModelStore.ConsumableItems.AsNoTracking().Where(query);

        public ScoreInfo Query(Expression<Func<ScoreInfo, bool>> query) => ModelStore.ConsumableItems.AsNoTracking().FirstOrDefault(query);

        protected override Task Populate(ScoreInfo model, ArchiveReader archive, CancellationToken cancellationToken = default)
            => Task.CompletedTask;

        protected override bool CheckLocalAvailability(ScoreInfo model, IQueryable<ScoreInfo> items)
            => base.CheckLocalAvailability(model, items)
               || (model.OnlineScoreID != null && items.Any(i => i.OnlineScoreID == model.OnlineScoreID));

        public override void ExportModelTo(ScoreInfo model, Stream outputStream)
        {
            var file = model.Files.SingleOrDefault();
            if (file == null)
                return;

            using (var inputStream = Files.Storage.GetStream(file.FileInfo.StoragePath))
                inputStream.CopyTo(outputStream);
        }

        protected override IEnumerable<string> GetStableImportPaths(Storage storage)
            => storage.GetFiles(ImportFromStablePath).Where(p => HandledExtensions.Any(ext => Path.GetExtension(p)?.Equals(ext, StringComparison.OrdinalIgnoreCase) ?? false))
                      .Select(path => storage.GetFullPath(path));
    }
}
