using NewHorizons.External.Modules.Props;
using NewHorizons.External.Modules.Props.EchoesOfTheEye;
using NewHorizons.Handlers;
using NewHorizons.Utility;
using NewHorizons.Utility.Files;
using NewHorizons.Utility.OWML;
using OWML.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using UnityEngine;

namespace NewHorizons.Builder.Props
{
    public static class ProjectionBuilder
    {
        private static GameObject _slideReelPrefab;
        private static GameObject _autoPrefab;
        private static GameObject _visionTorchDetectorPrefab;
        private static GameObject _standingVisionTorchPrefab;
        private static readonly int EmissionMap = Shader.PropertyToID("_EmissionMap");

        private static bool _isInit;

        internal static void InitPrefabs()
        {
            if (_isInit) return;

            _isInit = true;

            if (_slideReelPrefab == null)
            {
                _slideReelPrefab = SearchUtilities.Find("RingWorld_Body/Sector_RingInterior/Sector_Zone1/Sector_SlideBurningRoom_Zone1/Interactables_SlideBurningRoom_Zone1/Prefab_IP_SecretAlcove/RotationPivot/SlideReelSocket/Prefab_IP_Reel_1_LibraryPath")?.gameObject?.InstantiateInactive()?.Rename("Prefab_IP_Reel")?.DontDestroyOnLoad();
                if (_slideReelPrefab == null)
                    NHLogger.LogWarning($"Tried to make slide reel prefab but couldn't. Do you have the DLC installed?");
                else
                    _slideReelPrefab.AddComponent<DestroyOnDLC>()._destroyOnDLCNotOwned = true;
            }

            if (_autoPrefab == null)
            {
                _autoPrefab = SearchUtilities.Find("RingWorld_Body/Sector_RingInterior/Sector_Zone4/Sector_BlightedShore/Sector_JammingControlRoom_Zone4/Interactables_JammingControlRoom_Zone4/AutoProjector_SignalJammer/Prefab_IP_AutoProjector_SignalJammer")?.gameObject?.InstantiateInactive()?.Rename("Prefab_IP_AutoProjector")?.DontDestroyOnLoad();
                if (_autoPrefab == null)
                    NHLogger.LogWarning($"Tried to make auto projector prefab but couldn't. Do you have the DLC installed?");
                else
                    _autoPrefab.AddComponent<DestroyOnDLC>()._destroyOnDLCNotOwned = true;
            }

            if (_visionTorchDetectorPrefab == null)
            {
                _visionTorchDetectorPrefab = SearchUtilities.Find("DreamWorld_Body/Sector_DreamWorld/Sector_Underground/Sector_PrisonCell/Ghosts_PrisonCell/GhostDirector_Prisoner/Prefab_IP_GhostBird_Prisoner/Ghostbird_IP_ANIM/Ghostbird_Skin_01:Ghostbird_Rig_V01:Base/Ghostbird_Skin_01:Ghostbird_Rig_V01:Root/Ghostbird_Skin_01:Ghostbird_Rig_V01:Spine01/Ghostbird_Skin_01:Ghostbird_Rig_V01:Spine02/Ghostbird_Skin_01:Ghostbird_Rig_V01:Spine03/Ghostbird_Skin_01:Ghostbird_Rig_V01:Spine04/Ghostbird_Skin_01:Ghostbird_Rig_V01:Neck01/Ghostbird_Skin_01:Ghostbird_Rig_V01:Neck02/Ghostbird_Skin_01:Ghostbird_Rig_V01:Head/PrisonerHeadDetector")?.gameObject?.InstantiateInactive()?.Rename("Prefab_IP_VisionTorchDetector")?.DontDestroyOnLoad();
                if (_visionTorchDetectorPrefab == null)
                    NHLogger.LogWarning($"Tried to make vision torch detector prefab but couldn't. Do you have the DLC installed?");
                else
                    _visionTorchDetectorPrefab.AddComponent<DestroyOnDLC>()._destroyOnDLCNotOwned = true;
            }

            if (_standingVisionTorchPrefab == null)
            {
                _standingVisionTorchPrefab = SearchUtilities.Find("RingWorld_Body/Sector_RingWorld/Sector_SecretEntrance/Interactibles_SecretEntrance/Experiment_1/VisionTorchApparatus/VisionTorchRoot/Prefab_IP_VisionTorchProjector")?.gameObject?.InstantiateInactive()?.Rename("Prefab_IP_VisionTorchProjector")?.DontDestroyOnLoad();
                if (_standingVisionTorchPrefab == null)
                    NHLogger.LogWarning($"Tried to make standing vision torch prefab but couldn't. Do you have the DLC installed?");
                else
                    _standingVisionTorchPrefab.AddComponent<DestroyOnDLC>()._destroyOnDLCNotOwned = true;
            }
        }

        public static void Make(GameObject go, Sector sector, ProjectionInfo info, IModBehaviour mod)
        {
            switch (info.type)
            {
                case ProjectionInfo.SlideShowType.AutoProjector:
                    MakeAutoProjector(go, sector, info, mod);
                    break;
                case ProjectionInfo.SlideShowType.SlideReel:
                    MakeSlideReel(go, sector, info, mod);
                    break;
                case ProjectionInfo.SlideShowType.VisionTorchTarget:
                    MakeMindSlidesTarget(go, sector, info, mod);
                    break;
                case ProjectionInfo.SlideShowType.StandingVisionTorch:
                    MakeStandingVisionTorch(go, sector, info, mod);
                    break;
                default:
                    NHLogger.LogError($"Invalid projection type {info.type}");
                    break;
            }
        }

        private static GameObject MakeSlideReel(GameObject planetGO, Sector sector, ProjectionInfo info, IModBehaviour mod)
        {
            InitPrefabs();

            if (_slideReelPrefab == null) return null;

            var slideReelObj = GeneralPropBuilder.MakeFromPrefab(_slideReelPrefab, $"Prefab_IP_Reel_{mod.ModHelper.Manifest.Name}", planetGO, sector, info);

            var slideReel = slideReelObj.GetComponent<SlideReelItem>();
            slideReel.SetSector(sector);
            slideReel.SetVisible(true);

            var slideCollectionContainer = slideReelObj.GetRequiredComponent<SlideCollectionContainer>();

            foreach (var renderer in slideReelObj.GetComponentsInChildren<Renderer>())
            {
                renderer.enabled = true;
            }

            // Now we replace the slides
            int slidesCount = info.slides.Length;
            var slideCollection = new SlideCollection(slidesCount);
            slideCollection.streamingAssetIdentifier = string.Empty; // NREs if null

            // The base game ones only have 15 slides max
            var textures = new Texture2D[slidesCount >= 15 ? 15 : slidesCount];

            var imageLoader = AddAsyncLoader(slideReelObj, mod, info.slides, ref slideCollection);

            // this variable just lets us track how many of the first 15 slides have been loaded.
            // this way as soon as the last one is loaded (due to async loading, this may be
            // slide 7, or slide 3, or whatever), we can build the slide reel texture. This allows us
            // to avoid doing a "is every element in the array `textures` not null" check every time a texture finishes loading
            int displaySlidesLoaded = 0;
            imageLoader.imageLoadedEvent.AddListener(
                (Texture2D tex, int index) => 
                { 
                    slideCollection.slides[index]._image = ImageUtilities.Invert(tex); 

                    // Track the first 15 to put on the slide reel object
                    if (index < textures.Length) 
                    {
                        textures[index] = tex;
                        if (Interlocked.Increment(ref displaySlidesLoaded) == textures.Length)
                        {
                            // all textures required to build the reel's textures have been loaded
                            var slidesBack = slideReelObj.transform.Find("Props_IP_SlideReel_7/Slides_Back").GetComponent<MeshRenderer>();
                            var slidesFront = slideReelObj.transform.Find("Props_IP_SlideReel_7/Slides_Front").GetComponent<MeshRenderer>();

                            // Now put together the textures into a 4x4 thing for the materials
                            var reelTexture = ImageUtilities.MakeReelTexture(textures);
                            slidesBack.material.mainTexture = reelTexture;
                            slidesBack.material.SetTexture(EmissionMap, reelTexture);
                            slidesFront.material.mainTexture = reelTexture;
                            slidesFront.material.SetTexture(EmissionMap, reelTexture);
                        }
                    }
                }
            );

            // Else when you put them down you can't pick them back up
            slideReelObj.GetComponent<OWCollider>()._physicsRemoved = false;

            slideCollectionContainer.slideCollection = slideCollection;

            LinkShipLogFacts(info, slideCollectionContainer);

            StreamingHandler.SetUpStreaming(slideReelObj, sector);

            slideReelObj.SetActive(true);

            return slideReelObj;
        }

        public static GameObject MakeAutoProjector(GameObject planetGO, Sector sector, ProjectionInfo info, IModBehaviour mod)
        {
            InitPrefabs();

            if (_autoPrefab == null) return null;

            var projectorObj = GeneralPropBuilder.MakeFromPrefab(_autoPrefab, $"Prefab_IP_AutoProjector_{mod.ModHelper.Manifest.Name}", planetGO, sector, info);

            var autoProjector = projectorObj.GetComponent<AutoSlideProjector>();
            autoProjector._sector = sector;

            var slideCollectionContainer = autoProjector.GetRequiredComponent<SlideCollectionContainer>();

            // Now we replace the slides
            int slidesCount = info.slides.Length;
            var slideCollection = new SlideCollection(slidesCount);
            slideCollection.streamingAssetIdentifier = string.Empty; // NREs if null

            var imageLoader = AddAsyncLoader(projectorObj, mod, info.slides, ref slideCollection);
            imageLoader.imageLoadedEvent.AddListener((Texture2D tex, int index) => { slideCollection.slides[index]._image = ImageUtilities.Invert(tex); });

            slideCollectionContainer.slideCollection = slideCollection;

            StreamingHandler.SetUpStreaming(projectorObj, sector);

            // Change the picture on the lens
            var lens = projectorObj.transform.Find("Spotlight/Prop_IP_SingleSlideProjector/Projector_Lens").GetComponent<MeshRenderer>();
            lens.materials[1].mainTexture = slideCollection.slides[0]._image;
            lens.materials[1].SetTexture(EmissionMap, slideCollection.slides[0]._image);

            projectorObj.SetActive(true);

            return projectorObj;
        }

        // Makes a target for a vision torch to scan
        public static GameObject MakeMindSlidesTarget(GameObject planetGO, Sector sector, ProjectionInfo info, IModBehaviour mod)
        {
            InitPrefabs();

            if (_visionTorchDetectorPrefab == null) return null;

            // spawn a trigger for the vision torch
            var g = DetailBuilder.Make(planetGO, sector, _visionTorchDetectorPrefab, new DetailInfo(info) { scale = 2, rename = !string.IsNullOrEmpty(info.rename) ? info.rename : "VisionStaffDetector" });

            if (g == null)
            {
                NHLogger.LogWarning($"Tried to make a vision torch target but couldn't. Do you have the DLC installed?");
                return null;
            }

            // The number of slides is unlimited, 15 is only for texturing the actual slide reel item. This is not a slide reel item
            var slides = info.slides;
            var slidesCount = slides.Length;
            var slideCollection = new SlideCollection(slidesCount); // TODO: uh I think that info.slides[i].playTimeDuration is not being read here... note to self for when I implement support for that: 0.7 is what to default to if playTimeDuration turns out to be 0
            slideCollection.streamingAssetIdentifier = string.Empty; // NREs if null

            var imageLoader = AddAsyncLoader(g, mod, info.slides, ref slideCollection);
            imageLoader.imageLoadedEvent.AddListener((Texture2D tex, int index) => { slideCollection.slides[index]._image = tex; });

            // attach a component to store all the data for the slides that play when a vision torch scans this target
            var target = g.AddComponent<VisionTorchTarget>();
            var slideCollectionContainer = g.AddComponent<SlideCollectionContainer>();
            slideCollectionContainer.slideCollection = slideCollection;
            target.slideCollection = g.AddComponent<MindSlideCollection>();
            target.slideCollection._slideCollectionContainer = slideCollectionContainer;

            LinkShipLogFacts(info, slideCollectionContainer);

            g.SetActive(true);

            return g;
        }

        public static GameObject MakeStandingVisionTorch(GameObject planetGO, Sector sector, ProjectionInfo info, IModBehaviour mod)
        {
            InitPrefabs();

            if (_standingVisionTorchPrefab == null) return null;

            // Spawn the torch itself
            var standingTorch = DetailBuilder.Make(planetGO, sector, _standingVisionTorchPrefab, new DetailInfo(info));

            if (standingTorch == null)
            {
                NHLogger.LogWarning($"Tried to make a vision torch target but couldn't. Do you have the DLC installed?");
                return null;
            }

            // Set some required properties on the torch
            var mindSlideProjector = standingTorch.GetComponent<MindSlideProjector>();
            mindSlideProjector._mindProjectorImageEffect = SearchUtilities.Find("Player_Body/PlayerCamera").GetComponent<MindProjectorImageEffect>();
            
            // Setup for visually supporting async texture loading
            mindSlideProjector.enabled = false;	
            var visionBeamEffect = standingTorch.FindChild("VisionBeam");
            visionBeamEffect.SetActive(false);

            // Set up slides
            // The number of slides is unlimited, 15 is only for texturing the actual slide reel item. This is not a slide reel item
            var slides = info.slides;
            var slidesCount = slides.Length;
            var slideCollection = new SlideCollection(slidesCount);
            slideCollection.streamingAssetIdentifier = string.Empty; // NREs if null

            var imageLoader = AddAsyncLoader(standingTorch, mod, slides, ref slideCollection);

            // This variable just lets us track how many of the slides have been loaded.
            // This way as soon as the last one is loaded (due to async loading, this may be
            // slide 7, or slide 3, or whatever), we can enable the vision torch. This allows us
            // to avoid doing a "is every element in the array `slideCollection.slides` not null" check every time a texture finishes loading
            int displaySlidesLoaded = 0;
            imageLoader.imageLoadedEvent.AddListener(
                (Texture2D tex, int index) => 
                { 
                    slideCollection.slides[index]._image = tex;

                    if (Interlocked.Increment(ref displaySlidesLoaded) == slides.Length)
                    {
                        mindSlideProjector.enabled = true;
                        visionBeamEffect.SetActive(true);
                    }
                }
            );

            // Set up the containers for the slides
            var slideCollectionContainer = standingTorch.AddComponent<SlideCollectionContainer>();
            slideCollectionContainer.slideCollection = slideCollection;

            var mindSlideCollection = standingTorch.AddComponent<MindSlideCollection>();
            mindSlideCollection._slideCollectionContainer = slideCollectionContainer;

            // Make sure that these slides play when the player wanders into the beam
            slideCollectionContainer._initialized = true; // Hack to avoid initialization in the following call (it would throw NRE)
            mindSlideProjector.SetMindSlideCollection(mindSlideCollection);
            slideCollectionContainer._initialized = false;


            LinkShipLogFacts(info, slideCollectionContainer);

            standingTorch.SetActive(true);

            return standingTorch;
        }

        private static ImageUtilities.AsyncImageLoader AddAsyncLoader(GameObject gameObject, IModBehaviour mod, SlideInfo[] slides, ref SlideCollection slideCollection)
        {
            var imageLoader = gameObject.AddComponent<ImageUtilities.AsyncImageLoader>();
            for (int i = 0; i < slides.Length; i++)
            {
                var slide = new Slide();
                var slideInfo = slides[i];

                if (string.IsNullOrEmpty(slideInfo.imagePath))
                {
                    imageLoader.imageLoadedEvent?.Invoke(Texture2D.blackTexture, i);
                }
                else
                {
                    imageLoader.PathsToLoad.Add((i, Path.Combine(mod.ModHelper.Manifest.ModFolderPath, slideInfo.imagePath)));
                }

                AddModules(slideInfo, ref slide, mod);

                slideCollection.slides[i] = slide;
            }

            return imageLoader;
        }

        private static void AddModules(SlideInfo slideInfo, ref Slide slide, IModBehaviour mod)
        {
            var modules = new List<SlideFunctionModule>();
            if (!String.IsNullOrEmpty(slideInfo.beatAudio))
            {
                var audioBeat = new SlideBeatAudioModule
                {
                    _audioType = AudioTypeHandler.GetAudioType(slideInfo.beatAudio, mod),
                    _delay = slideInfo.beatDelay
                };
                modules.Add(audioBeat);
            }
            if (!String.IsNullOrEmpty(slideInfo.backdropAudio))
            {
                var audioBackdrop = new SlideBackdropAudioModule
                {
                    _audioType = AudioTypeHandler.GetAudioType(slideInfo.backdropAudio, mod),
                    _fadeTime = slideInfo.backdropFadeTime
                };
                modules.Add(audioBackdrop);
            }
            if (slideInfo.ambientLightIntensity > 0)
            {
                var ambientLight = new SlideAmbientLightModule
                {
                    _intensity = slideInfo.ambientLightIntensity,
                    _range = slideInfo.ambientLightRange,
                    _color = slideInfo.ambientLightColor.ToColor(),
                    _spotIntensityMod = slideInfo.spotIntensityMod
                };
                modules.Add(ambientLight);
            }
            if (slideInfo.playTimeDuration != 0)
            {
                var playTime = new SlidePlayTimeModule
                {
                    _duration = slideInfo.playTimeDuration
                };
                modules.Add(playTime);
            }
            if (slideInfo.blackFrameDuration != 0)
            {
                var blackFrame = new SlideBlackFrameModule
                {
                    _duration = slideInfo.blackFrameDuration
                };
                modules.Add(blackFrame);
            }
            if (!String.IsNullOrEmpty(slideInfo.reveal))
            {
                var shipLogEntry = new SlideShipLogEntryModule
                {
                    _entryKey = slideInfo.reveal
                };
                modules.Add(shipLogEntry);
            }

            Slide.WriteModules(modules, ref slide._modulesList, ref slide._modulesData, ref slide.lengths);
        }
        
        private static void LinkShipLogFacts(ProjectionInfo info, SlideCollectionContainer slideCollectionContainer)
        {
            // Idk why but it wants reveals to be comma delimited not a list
            if (info.reveals != null) slideCollectionContainer._shipLogOnComplete = string.Join(",", info.reveals);
            // Don't use null value, NRE in SlideCollectionContainer.Initialize
            slideCollectionContainer._playWithShipLogFacts = info.playWithShipLogFacts ?? Array.Empty<string>();
        }
    }

    public class VisionTorchTarget : MonoBehaviour
    {
        public MindSlideCollection slideCollection;

        // This Callback is never used in NH itself.
        // It exists for addons that want to trigger events when the mind slide show starts.
        public OWEvent.OWCallback onSlidesStart;

        // This Callback is never used in NH itself.
        // It exists for addons that want to trigger events after the mind slide show is complete.
        public OWEvent.OWCallback onSlidesComplete;
    }
}