using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Ichni.RhythmGame.Beatmap;
using UniRx;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.Events;

namespace Ichni.RhythmGame
{
    public class TransformSubmodule : SubmoduleBase
    {
        public Vector3 originalPosition;
        public Vector3 originalEulerAngles;
        public Vector3 originalScale;

        public List<Vector3> positionOffset;
        public List<Vector3> eulerAnglesOffset;
        public List<Vector3> scaleOffset;

        public Vector3 currentPosition;
        public Vector3 currentEulerAngles;
        public Vector3 currentScale;

        public bool positionDirtyMark;
        public bool eulerAnglesDirtyMark;
        public bool scaleDirtyMark;

        public bool eulerAnglesOffsetLock;


        public TransformSubmodule(GameElement attachedGameElement) : base(attachedGameElement)
        {
            this.originalPosition = Vector3.zero;
            this.originalEulerAngles = Vector3.zero;
            this.originalScale = Vector3.one;

            positionOffset = new List<Vector3>();
            eulerAnglesOffset = new List<Vector3>();
            scaleOffset = new List<Vector3>();

            currentPosition = Vector3.zero;
            currentEulerAngles = Vector3.zero;
            currentScale = Vector3.one;

            positionDirtyMark = false;
            eulerAnglesDirtyMark = false;
            scaleDirtyMark = false;

            eulerAnglesOffsetLock = false;

            // (attachedGameElement as IHaveTransformSubmodule).SetTransformObserver();
        }

        public TransformSubmodule(GameElement attachedGameElement,
            Vector3 originalPosition, Vector3 originalEulerAngles, Vector3 originalScale) : base(attachedGameElement)
        {
            this.originalPosition = originalPosition;
            this.originalEulerAngles = originalEulerAngles;
            this.originalScale = originalScale;

            positionOffset = new List<Vector3>();
            eulerAnglesOffset = new List<Vector3>();
            scaleOffset = new List<Vector3>();

            currentPosition = originalPosition;
            currentEulerAngles = originalEulerAngles;
            currentScale = originalScale;

            positionDirtyMark = false;
            eulerAnglesDirtyMark = false;
            scaleDirtyMark = false;

            eulerAnglesOffsetLock = false;

            // (attachedGameElement as IHaveTransformSubmodule).SetTransformObserver();
        }

        public override void SaveBM()
        {
            matchedBM = new TransformSubmodule_BM(attachedGameElement);
        }
    }

    public interface IHaveTransformSubmodule
    {
        TransformSubmodule transformSubmodule { get; set; }

        public void SetTransformObserver()
        {
            GameElement attachedGameElement = transformSubmodule.attachedGameElement;
            
            Observable.EveryUpdate().Subscribe(_ =>
            {
                if (transformSubmodule == null)
                {
                    return;
                }

                if (transformSubmodule.scaleDirtyMark)
                {
                    Vector3 offset = Vector3.zero;
                    foreach (Vector3 scaleOffset in transformSubmodule.scaleOffset)
                    {
                        offset += scaleOffset;
                    }

                    transformSubmodule.currentScale = transformSubmodule.originalScale + offset;
                    attachedGameElement.transform.localScale = transformSubmodule.currentScale;
                    transformSubmodule.scaleDirtyMark = false;
                }

                if (transformSubmodule.eulerAnglesDirtyMark)
                {
                    Vector3 offset = Vector3.zero;
                    foreach (Vector3 eulerOffset in transformSubmodule.eulerAnglesOffset)
                    {
                        offset += eulerOffset;
                    }

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

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

                    transformSubmodule.currentPosition = transformSubmodule.originalPosition + offset;
                    attachedGameElement.transform.localPosition = transformSubmodule.currentPosition;
                    transformSubmodule.positionDirtyMark = false;
                }

                transformSubmodule.scaleOffset.Clear();
                transformSubmodule.eulerAnglesOffset.Clear();
                transformSubmodule.positionOffset.Clear();
            }).AddTo(attachedGameElement);
        }
    }

    namespace Beatmap
    {
        public class TransformSubmodule_BM : Submodule_BM
        {
            public Vector3 originalPosition;
            public Vector3 originalEulerAngles;
            public Vector3 originalScale;

            public TransformSubmodule_BM()
            {

            }

            public TransformSubmodule_BM(GameElement attachedElement) : base(attachedElement)
            {
                TransformSubmodule transformSubmodule = (attachedElement as IHaveTransformSubmodule).transformSubmodule;
                this.originalPosition = transformSubmodule.originalPosition;
                this.originalEulerAngles = transformSubmodule.originalEulerAngles;
                this.originalScale = transformSubmodule.originalScale;
            }

            public override void ExecuteBM()
            {
                attachedElement = GameElement_BM.GetElement(attachedElementGuid);
                (attachedElement as IHaveTransformSubmodule).transformSubmodule =
                    new TransformSubmodule(attachedElement, originalPosition, originalEulerAngles, originalScale);
            }

            public override void DuplicateBM(GameElement attached)
            {
                (attached as IHaveTransformSubmodule).transformSubmodule =
                    new TransformSubmodule(attached, originalPosition, originalEulerAngles, originalScale);
            }
        }
    }
}