using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Ichni.RhythmGame.Beatmap;
using UniRx;
using UnityEngine;
using UnityEngine.Rendering.Universal;
using UnityEngine.Serialization;

namespace Ichni.RhythmGame
{
    public partial class GameCamera : GameElement, IHaveTransformSubmodule, IHaveTimeDurationSubmodule
    {
        [FormerlySerializedAs("camera")] public new Camera gameCamera;
        public Transform rotationPoint;
        public Transform positionPoint;
        public Transform cameraTransform;

        public CameraViewType cameraViewType;
        public float perspectiveAngle;
        public float orthographicSize;

        public TransformSubmodule transformSubmodule { get; set; }
        public TimeDurationSubmodule timeDurationSubmodule { get; set; }
        private static CameraManager cameraManager => GameManager.instance.cameraManager;

        public static GameCamera GenerateElement(string elementName, Guid id,
            List<string> tags, bool isFirstGenerated, GameElement parentElement,
            CameraViewType cameraViewType, float perspectiveAngle, float orthographicSize)
        {
            GameCamera gameCamera = Instantiate(GameManager.instance.basePrefabs.gameCamera).GetComponent<GameCamera>();

            gameCamera.Initialize(elementName, id, tags, isFirstGenerated, parentElement);

            cameraManager.gameCamera = gameCamera;
            
            gameCamera.parentElement = parentElement;
            gameCamera.cameraViewType = cameraViewType;
            gameCamera.gameCamera.orthographic = cameraViewType == CameraViewType.Orthographic;
            gameCamera.perspectiveAngle = perspectiveAngle;
            gameCamera.orthographicSize = orthographicSize;
            gameCamera.cameraTransform = gameCamera.transform;

            return gameCamera;
        }

        public override void AfterInitialize()
        {
            base.AfterInitialize();
            gameCamera.GetComponent<UniversalAdditionalCameraData>().cameraStack.Add(cameraManager.uiCamera);
            GameManager.instance.backgroundController.backgroundCanvas.worldCamera = gameCamera;
        }

        public override void SetDefaultSubmodules()
        {
            transformSubmodule = new TransformSubmodule(this);
        }
    }

    public partial class GameCamera
    {
        public enum CameraViewType
        {
            Perspective = 0,
            Orthographic = 1
        }
    }

    public partial class GameCamera
    {
        private Vector3 GetWorldEulerAngles()
        {
            Vector3 output = transformSubmodule.originalEulerAngles;
            GameElement element = this;
            while (element != null)
            {
                if (element is IHaveTransformSubmodule)
                {
                    output += ((TransformSubmodule)element.submoduleList.Where(r => r is TransformSubmodule).First()).currentEulerAngles;
                }
                element = element.parentElement;
            }


            return output;
        }
        public void SetTransformObserver()
        {
            Observable.EveryLateUpdate().Subscribe(_ =>
            {
                if (!GameManager.instance.audioManager.isUpdating && transformSubmodule == null)
                {
                    return;
                }
                
                bool willRefresh = false;
                
                if (transformSubmodule.eulerAnglesOffsetLock)
                {
                    transform.localEulerAngles = transformSubmodule.originalEulerAngles;
                }
                else if (transformSubmodule.eulerAnglesDirtyMark)
                {
                    Vector3 offset = Vector3.zero;
                    foreach (Vector3 eulerOffset in transformSubmodule.eulerAnglesOffset)
                    {
                        offset += eulerOffset;
                    }

                    transformSubmodule.currentEulerAngles = transformSubmodule.originalEulerAngles + offset;
                    transform.localEulerAngles = transformSubmodule.currentEulerAngles;
                    transformSubmodule.eulerAnglesDirtyMark = false;
                    willRefresh = true;
                }

                if (transformSubmodule.positionDirtyMark)
                {
                    Vector3 offset = Vector3.zero;
                    foreach (Vector3 posOffset in transformSubmodule.positionOffset)
                    {
                        offset += posOffset;
                    }

                    transformSubmodule.currentPosition = transformSubmodule.originalPosition + offset;
                    transform.localPosition = transformSubmodule.currentPosition;
                    transformSubmodule.positionDirtyMark = false;
                    willRefresh = true;
                }
                
                if(willRefresh)
                {
                    this.Refresh();
                }
                
                transformSubmodule.eulerAnglesOffset.Clear();
                transformSubmodule.positionOffset.Clear();
                
            }).AddTo(gameObject);
        }
    }

    public partial class GameCamera
    {
        public override void SaveBM()
        {
            matchedBM = new GameCamera_BM(elementName, elementGuid, tags,
                parentElement.matchedBM as GameElement_BM, cameraViewType, perspectiveAngle, orthographicSize);
        }
    }

    namespace Beatmap
    {
        public class GameCamera_BM : GameElement_BM
        {
            public GameCamera.CameraViewType cameraViewType;
            public float perspectiveAngle;
            public float orthographicSize;

            public GameCamera_BM()
            {

            }

            public GameCamera_BM(string elementName, Guid elementGuid, List<string> tags,
                GameElement_BM attachedElement, GameCamera.CameraViewType cameraViewType,
                float perspectiveAngle, float orthographicSize)
                : base(elementName, elementGuid, tags, attachedElement)
            {
                this.cameraViewType = cameraViewType;
                this.perspectiveAngle = perspectiveAngle;
                this.orthographicSize = orthographicSize;
            }

            public override void ExecuteBM()
            {
                matchedElement = GameCamera.GenerateElement(elementName, elementGuid, tags, false,
                    GetElement(attachedElementGuid), cameraViewType, perspectiveAngle, orthographicSize);
            }

            public override GameElement DuplicateBM(GameElement parent)
            {
                return GameCamera.GenerateElement(elementName, Guid.NewGuid(), tags, false,
                    parent, cameraViewType, perspectiveAngle, orthographicSize);
            }
        }
    }
}