/**
[EasyMotionRecorder]

Copyright (c) 2018 Duo.inc

This software is released under the MIT License.
http://opensource.org/licenses/mit-license.php
*/

using UnityEngine;
using System;

namespace Entum
{
    /// <summary>
    /// 모션 데이터 재생 클래스
    /// SpringBone, DynamicBone, BulletPhysicsImpl 등의 흔들리는 에셋의 Script Execution Order를 20000 등
    /// 큰 값으로 설정해주세요.
    /// DefaultExecutionOrder(11000)은 VRIK계보다 처리 순서를 느리게 한다는 의도입니다
    /// </summary>
    [DefaultExecutionOrder(11000)]
    public class MotionDataPlayer : MonoBehaviour
    {
        [SerializeField]
        private KeyCode _playStartKey = KeyCode.S;
        [SerializeField]
        private KeyCode _playStopKey = KeyCode.T;

        [SerializeField]
        protected HumanoidPoses RecordedMotionData;
        [SerializeField]
        private Animator _animator;

        [SerializeField, Tooltip("재생 시작 프레임을 지정합니다. 0이면 파일 시작부터 시작합니다")]
        private int _startFrame;
        [SerializeField]
        private bool _playing;
        [SerializeField]
        private int _frameIndex;

        [SerializeField, Tooltip("普段はOBJECTROOTで問題ないです。特殊な機材の場合は変更してください")]
        private MotionDataSettings.Rootbonesystem _rootBoneSystem = MotionDataSettings.Rootbonesystem.Objectroot;
        [SerializeField, Tooltip("rootBoneSystemがOBJECTROOTの時は使われないパラメータです。")]
        private HumanBodyBones _targetRootBone = HumanBodyBones.Hips;

        [HideInInspector, SerializeField] private string instanceID = "";
        [HideInInspector, SerializeField] private bool useDontDestroyOnLoad = false;

        private HumanPoseHandler _poseHandler;
        private Action _onPlayFinish;
        private float _playingTime;

        private void Awake()
        {
            if (_animator == null)
            {
                Debug.LogError("MotionDataPlayerにanimatorがセットされていません。MotionDataPlayerを削除します。");
                Destroy(this);
                return;
            }

            // 인스턴스 ID가 비어있으면 자동 생성
            if (string.IsNullOrEmpty(instanceID))
            {
                instanceID = System.Guid.NewGuid().ToString().Substring(0, 8);
            }

            // DontDestroyOnLoad 설정 (선택적)
            if (useDontDestroyOnLoad)
            {
                DontDestroyOnLoad(gameObject);
            }

            _poseHandler = new HumanPoseHandler(_animator.avatar, _animator.transform);
            _onPlayFinish += StopMotion;
        }

        // 매 프레임마다 호출
        private void Update()
        {
            if (Input.GetKeyDown(_playStartKey))
            {
                PlayMotion();
            }

            if (Input.GetKeyDown(_playStopKey))
            {
                StopMotion();
            }
        }

        private void LateUpdate()
        {
            if (!_playing)
            {
                return;
            }

            _playingTime += Time.deltaTime;
            SetHumanPose();
        }

        /// <summary>
        /// 모션 데이터 재생 시작
        /// </summary>
        private void PlayMotion()
        {
            if (_playing)
            {
                return;
            }

            if (RecordedMotionData == null)
            {
                Debug.LogError("재생할 모션 데이터가 없습니다.");
                return;
            }

            _playing = true;
            _frameIndex = _startFrame;
            _playingTime = 0f;

            Debug.Log($"모션 재생 시작 - 인스턴스: {instanceID}, 시작 프레임: {_startFrame}");
        }

        private void StopMotion()
        {
            if (!_playing)
            {
                return;
            }

            _playing = false;
            Debug.Log($"모션 재생 중지 - 인스턴스: {instanceID}, 재생된 프레임: {_frameIndex}");
        }

        private void SetHumanPose()
        {
            if (RecordedMotionData == null || RecordedMotionData.Poses == null || RecordedMotionData.Poses.Count == 0)
            {
                StopMotion();
                return;
            }

            if (_frameIndex >= RecordedMotionData.Poses.Count)
            {
                StopMotion();
                _onPlayFinish?.Invoke();
                return;
            }

            var pose = RecordedMotionData.Poses[_frameIndex];
            var humanPose = new HumanPose();

            // 본 데이터 설정
            if (pose.HumanoidBones != null)
            {
                foreach (var bone in pose.HumanoidBones)
                {
                    // HumanBodyBones enum으로 변환
                    HumanBodyBones bodyBone;
                    if (System.Enum.TryParse(bone.Name, out bodyBone))
                    {
                        var boneTransform = _animator.GetBoneTransform(bodyBone);
                        if (boneTransform != null)
                        {
                            boneTransform.localPosition = bone.LocalPosition;
                            boneTransform.localRotation = bone.LocalRotation;
                        }
                    }
                }
            }

            // 근육 데이터 설정
            if (pose.Muscles != null && pose.Muscles.Length > 0)
            {
                humanPose.muscles = pose.Muscles;
            }

            // 루트 본 설정
            switch (_rootBoneSystem)
            {
                case MotionDataSettings.Rootbonesystem.Objectroot:
                    _animator.transform.localPosition = pose.BodyRootPosition;
                    _animator.transform.localRotation = pose.BodyRootRotation;
                    break;

                case MotionDataSettings.Rootbonesystem.Hipbone:
                    var hipBone = _animator.GetBoneTransform(_targetRootBone);
                    if (hipBone != null)
                    {
                        hipBone.position = pose.BodyRootPosition;
                        hipBone.rotation = pose.BodyRootRotation;
                    }
                    break;
            }

            // HumanPose 적용
            _poseHandler.SetHumanPose(ref humanPose);

            _frameIndex++;
        }

        public void SetInstanceID(string id)
        {
            instanceID = id;
        }

        public void SetUseDontDestroyOnLoad(bool use)
        {
            useDontDestroyOnLoad = use;
        }

        public string GetInstanceID()
        {
            return instanceID;
        }
    }
}