// 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.Threading.Tasks;
using osu.Framework.Allocation;
using osu.Framework.Audio;
using osu.Framework.Audio.Sample;
using osu.Framework.Audio.Track;
using osu.Framework.Bindables;
using osu.Framework.Graphics.Textures;
using osu.Framework.IO.Stores;
using osu.Game.Rulesets.Configuration;

namespace osu.Game.Rulesets.UI
{
    public class DrawableRulesetDependencies : DependencyContainer, IDisposable
    {
        /// <summary>
        /// The texture store to be used for the ruleset.
        /// </summary>
        public TextureStore TextureStore { get; }

        /// <summary>
        /// The sample store to be used for the ruleset.
        /// </summary>
        /// <remarks>
        /// This is the local sample store pointing to the ruleset sample resources,
        /// the cached sample store (<see cref="FallbackSampleStore"/>) retrieves from
        /// this store and falls back to the parent store if this store doesn't have the requested sample.
        /// </remarks>
        public ISampleStore SampleStore { get; }

        /// <summary>
        /// The ruleset config manager.
        /// </summary>
        public IRulesetConfigManager RulesetConfigManager { get; private set; }

        public DrawableRulesetDependencies(Ruleset ruleset, IReadOnlyDependencyContainer parent)
            : base(parent)
        {
            var resources = ruleset.CreateResourceStore();

            if (resources != null)
            {
                TextureStore = new TextureStore(new TextureLoaderStore(new NamespacedResourceStore<byte[]>(resources, @"Textures")));
                TextureStore.AddStore(parent.Get<TextureStore>());
                Cache(TextureStore);

                SampleStore = parent.Get<AudioManager>().GetSampleStore(new NamespacedResourceStore<byte[]>(resources, @"Samples"));
                SampleStore.PlaybackConcurrency = OsuGameBase.SAMPLE_CONCURRENCY;
                CacheAs<ISampleStore>(new FallbackSampleStore(SampleStore, parent.Get<ISampleStore>()));
            }

            RulesetConfigManager = parent.Get<RulesetConfigCache>().GetConfigFor(ruleset);
            if (RulesetConfigManager != null)
                Cache(RulesetConfigManager);
        }

        #region Disposal

        ~DrawableRulesetDependencies()
        {
            Dispose(false);
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        private bool isDisposed;

        protected void Dispose(bool disposing)
        {
            if (isDisposed)
                return;

            isDisposed = true;

            SampleStore?.Dispose();
            RulesetConfigManager = null;
        }

        #endregion
    }

    /// <summary>
    /// A sample store which adds a fallback source.
    /// </summary>
    /// <remarks>
    /// This is a temporary implementation to workaround ISampleStore limitations.
    /// </remarks>
    public class FallbackSampleStore : ISampleStore
    {
        private readonly ISampleStore primary;
        private readonly ISampleStore secondary;

        public FallbackSampleStore(ISampleStore primary, ISampleStore secondary)
        {
            this.primary = primary;
            this.secondary = secondary;
        }

        public SampleChannel Get(string name) => primary.Get(name) ?? secondary.Get(name);

        public Task<SampleChannel> GetAsync(string name) => primary.GetAsync(name) ?? secondary.GetAsync(name);

        public Stream GetStream(string name) => primary.GetStream(name) ?? secondary.GetStream(name);

        public IEnumerable<string> GetAvailableResources() => throw new NotSupportedException();

        public void AddAdjustment(AdjustableProperty type, BindableNumber<double> adjustBindable) => throw new NotSupportedException();

        public void RemoveAdjustment(AdjustableProperty type, BindableNumber<double> adjustBindable) => throw new NotSupportedException();

        public BindableNumber<double> Volume => throw new NotSupportedException();

        public BindableNumber<double> Balance => throw new NotSupportedException();

        public BindableNumber<double> Frequency => throw new NotSupportedException();

        public BindableNumber<double> Tempo => throw new NotSupportedException();

        public IBindable<double> GetAggregate(AdjustableProperty type) => throw new NotSupportedException();

        public IBindable<double> AggregateVolume => throw new NotSupportedException();

        public IBindable<double> AggregateBalance => throw new NotSupportedException();

        public IBindable<double> AggregateFrequency => throw new NotSupportedException();

        public IBindable<double> AggregateTempo => throw new NotSupportedException();

        public int PlaybackConcurrency
        {
            get => throw new NotSupportedException();
            set => throw new NotSupportedException();
        }

        public void Dispose()
        {
        }
    }
}