using System;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.Pool;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class ConstructionSiteManager : GameSystem, IInitializable, IDisposable, IUpdatable
    {
        private const int SpatialLookupCellSize = 5;

        private const int StorageCapacity = 100;

        [InjectService]
        private GameConfig _config;

        [InjectService]
        private IScene _scene;

        [InjectService]
        private ISignalBus _signalBus;

        [InjectService]
        private IEntityCollection _entityCollection;

        [InjectService]
        private ITileSpace _tileSpace;

        [InjectService]
        private IProductStorageManager _productStorageManager;

        [InjectService]
        private IProductCatalog _productCatalog;

        [InjectService]
        private IProductStackFactory _productStackFactory;

        [InjectService]
        private IAgentFactory _agentFactory;

        private Dictionary<int, GameObject> _visualizations = new();

        private SpatialLookup<(ConstructionSite, GameObject)> _spatialLookup = new(SpatialLookupCellSize);

        private MaterialPropertyBlock _materialPropertyBlock;

        public ConstructionSiteManager(IServiceLocator serviceLocator) : base(serviceLocator)
        {
        }

        public UniTask InitializeAsync()
        {
            _signalBus.Subscribe<BuildingPlacementAnimationCompletedSignal>(OnBuildingPlaced);
            _signalBus.Subscribe<CollectDeletedGameObjectsSignal>(OnCollectDeletedGameObjects);
            _signalBus.Subscribe<DoDeleteToolSignal>(OnDoDeleteTool);

            return UniTask.CompletedTask;
        }

        public void Dispose()
        {
            _signalBus.Unsubscribe<BuildingPlacementAnimationCompletedSignal>(OnBuildingPlaced);
            _signalBus.Unsubscribe<CollectDeletedGameObjectsSignal>(OnCollectDeletedGameObjects);
            _signalBus.Unsubscribe<DoDeleteToolSignal>(OnDoDeleteTool);
        }

        private void OnBuildingPlaced(BuildingPlacementAnimationCompletedSignal signal)
        {
            var constructionSite = _entityCollection.Create<ConstructionSite>();

            constructionSite.Building = signal.Building;
            constructionSite.Rect = signal.Rect;
            constructionSite.Orientation = signal.Orientation;
            _productStorageManager.InitializeProductStorage(constructionSite, StorageCapacity);
            _agentFactory.InitializeAgentSource(constructionSite);

            _entityCollection.Add(constructionSite);

            _ = CreateVisualizationAsync(constructionSite);
        }

        private async UniTask CreateVisualizationAsync(ConstructionSite constructionSite)
        {
            var position = _tileSpace.GetRectWorldCenter(constructionSite.Rect);
            var rotation = constructionSite.Orientation.ToQuaternion();
            var folder = _scene.SceneFolders.Buildings;

            var visualization = await constructionSite.Building.Visualization.InstantiateAsync(position, rotation, folder);
            ReplaceMaterials(visualization);

            _visualizations.Add(constructionSite.Id, visualization);
            _spatialLookup.Add((constructionSite, visualization), constructionSite.Rect, constructionSite.Id);
        }

        private void ReplaceMaterials(GameObject gameObject)
        {
            var material = _config.Buildings.ConstructionSiteMaterial;

            using var renderersScope = ListPool<Renderer>.Get(out var renderers);
            gameObject.GetComponentsInChildren(renderers);

            _materialPropertyBlock ??= new MaterialPropertyBlock();

            foreach (var renderer in renderers) MaterialReplacementCache.ReplaceRendererMaterials(renderer, material, _materialPropertyBlock);
        }

        public void Update()
        {
            using var toCompleteScope = ListPool<ConstructionSite>.Get(out var toComplete);

            foreach (ConstructionSite constructionSite in _entityCollection.GetInternalEntityList(typeof(ConstructionSite)))
                if (_visualizations.ContainsKey(constructionSite.Id) && AllBuildingMaterialsFetched(constructionSite))
                    toComplete.Add(constructionSite);

            foreach (var constructionSite in toComplete)
            {
                _entityCollection.Remove(constructionSite.Id);

                _visualizations.Remove(constructionSite.Id, out var visualization);
                _spatialLookup.Remove(constructionSite.Rect, constructionSite.Id);

                constructionSite.Building.Visualization.ReleaseInstance(visualization);

                _signalBus.Raise(new ConstructionCompletedSignal(constructionSite));
            }
        }

        private bool AllBuildingMaterialsFetched(ConstructionSite constructionSite)
        {
            ref var storage = ref constructionSite.GetStorageRW();

            foreach (var (product, amount) in constructionSite.Building.BuildingMaterials)
            {
                var handle = _productCatalog.GetHandle(product);
                if (storage.AvailableNow(handle) < amount) return false;
            }

            return true;
        }

        private void OnCollectDeletedGameObjects(CollectDeletedGameObjectsSignal signal)
        {
            if ((signal.Filter & DeletedGameObjectsFilter.Buildings) == 0) return;

            using var lookupResultScope = ListPool<(ConstructionSite, GameObject)>.Get(out var lookupResult);
            _spatialLookup.Find(signal.Rect, lookupResult);

            foreach (var (_, visualization) in lookupResult) signal.GameObjects.Add(visualization);
        }

        private void OnDoDeleteTool(DoDeleteToolSignal signal)
        {
            using var lookupResultScope = ListPool<(ConstructionSite, GameObject)>.Get(out var lookupResult);
            _spatialLookup.Find(signal.Rect, lookupResult);

            foreach (var (constructionSite, visualization) in lookupResult)
            {
                _productStackFactory.CreateProductStacksFrom(constructionSite);

                _entityCollection.Remove(constructionSite.Id);
                _visualizations.Remove(constructionSite.Id);
                _spatialLookup.Remove(constructionSite.Rect, constructionSite.Id);

                constructionSite.Building.Visualization.ReleaseInstance(visualization);

                _signalBus.Raise(new ConstructionSiteDeletedSignal(constructionSite));
            }
        }
    }
}