// ***********************************************************************
// Assembly         : Unity
// Author           : Kimch
// Created          : 2018-2-29
// Description      : 战骑
// Last Modified By : 
// Last Modified On : 
// ***********************************************************************
// <copyright file= "Pet_eagle" company=""></copyright>
// <summary></summary>
// ***********************************************************************
using UnityEngine;

namespace G
{
    public class Pet_eagle : MonoBehaviour
    {
        #region Field

        private Transform _cha;

        private Vector3 _rndPos;

        private float _skillDelay = 2f;

        private bool _skillOn;

        private Vector3 _direction;

        private Transform _findItem;

        private int _itemBehaviour;

        private Quaternion _rotate;

        private Vector3 _edgePos;

        private bool _aniSpeedChange;

        private float _flySpeed = 0.5f;

        private float _finishDelay = -3f;

        private float _getItemDelay;

        private Animation _animation;

        #endregion

        #region Method

        public void LoadDir()
        {
            _rndPos = _cha.position + _edgePos;
            _direction = _rndPos - transform.position;
            _direction.y = 0f;
            if (_direction != Vector3.zero)
            {
                _rotate = Quaternion.LookRotation(_direction);
            }
        }

        public void SetRndPosition()
        {
            _edgePos = Random.insideUnitSphere * 0.1f;
            _edgePos.y = 0.3f;
            var currentMotion = Random.Range(0, 10);
            if (currentMotion < 7 || _skillOn)
            {
                _animation.CrossFade("fly_flap");
            }
            else
            {
                _animation.CrossFade("fly_glide");
            }
        }

        public void SkillOn()
        {
            _skillOn = true;
            _aniSpeedChange = true;
        }

        public void SkillOff()
        {
            _skillOn = false;
            _aniSpeedChange = true;
        }

        public void GetItem(Transform findItem)
        {
            if (_itemBehaviour == 0 && !_skillOn)
            {
                _finishDelay = 5.5f;
                _itemBehaviour = 1;
                _findItem = findItem;

                _direction = _findItem.position - transform.position;
                _direction.y = 0f;
                CancelInvoke(nameof(LoadDir));
                CancelInvoke(nameof(SetRndPosition));
            }
        }

        #endregion

        #region Unity

        private void Awake()
        {
            _animation = this.GetComponent<Animation>();
            _cha = GameObject.FindWithTag("Player").transform;

        }

        public void OnEnable()
        {
            InvokeRepeating(nameof(LoadDir), 0.1f, 0.1f);
            InvokeRepeating(nameof(SetRndPosition), 0.1f, 2f);

            _finishDelay = 0f;
            float x = 2 * Random.Range(0, 2) - 1;
            float z = 2 * Random.Range(0, 2) - 1;
            _edgePos = new Vector3(x * 0.6f, 0.3f, z * 0.5f);
            this.transform.position = _cha.position + _edgePos;
            _flySpeed = 0.5f;
            _animation.CrossFade("fly_flap");
        }

        private void Start()
        {
            _animation["fly_glide"].layer = 1;
            _animation["fly_glide"].speed = 0.4f;

            _animation["fly_flap"].layer = 1;
            _animation["fly_flap"].speed = 0.4f;
            _finishDelay = -3f;

        }

        private void Update()
        {
            if (_skillOn)
            {
                if (_skillDelay > 0f)
                {
                    transform.position = Vector3.Lerp(transform.position, _cha.position + Vector3.up * 0.3f, Time.deltaTime * 6f);
                    _skillDelay -= Time.deltaTime;
                    var tochaV = _cha.position - transform.position;
                    tochaV.y = 0f;
                    if (tochaV != Vector3.zero)
                    {
                        transform.rotation = Quaternion.LookRotation(tochaV);
                    }
                }
                else
                {
                    transform.position = _cha.position + Vector3.up * 0.3f;
                    transform.rotation = Quaternion.Lerp(transform.rotation, _cha.rotation, Time.deltaTime * 3f);
                    if (_aniSpeedChange)
                    {
                        _animation["fly_flap"].speed = 0.7f;
                        _aniSpeedChange = false;
                    }
                }
                return;
            }

            if (_itemBehaviour == 1)
            {
                if (_findItem.gameObject.activeSelf)
                {
                    _animation.CrossFade("fly_flap");
                    _getItemDelay += Time.deltaTime;
                    if (_getItemDelay > 2.5f)
                    {
                        _getItemDelay = 0f;
                        _itemBehaviour = 2;
                    }
                    else if (_getItemDelay > 2.2f)
                    {
                        _findItem.position = Vector3.MoveTowards(_findItem.position, transform.position, Time.deltaTime);
                    }
                    transform.position = Vector3.Lerp(transform.position, _findItem.position, Time.deltaTime * 2f);
                    if (_direction != Vector3.zero)
                    {
                        transform.rotation = Quaternion.LookRotation(_direction);
                    }
                }
                else
                {
                    _itemBehaviour = 0;
                }
                return;
            }

            if (_itemBehaviour == 2)
            {
                if (_findItem.gameObject.activeSelf)
                {
                    _getItemDelay += Time.deltaTime;
                    if (_getItemDelay > 2f)
                    {
                        _itemBehaviour = 0;
                        _getItemDelay = 0f;
                        return;
                    }

                    if (_getItemDelay > 1f)
                    {
                        _findItem.position = Vector3.MoveTowards(_findItem.position, _cha.position, Time.deltaTime * 1.2f);
                        transform.position += transform.forward * Time.deltaTime * 0.8f;
                        return;
                    }

                    _direction = _cha.position - transform.position;
                    _direction.y = 0f;
                    if (_direction != Vector3.zero)
                    {
                        transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.LookRotation(_direction), Time.deltaTime * 3f);
                    }
                    transform.position = Vector3.Lerp(transform.position, _cha.position + Vector3.up * 0.3f, Time.deltaTime * 2f);
                    _findItem.position = transform.position - Vector3.up * 0.1f;
                }
                else
                {
                    _itemBehaviour = 0;
                }
                return;
            }

            _finishDelay += Time.deltaTime;
            if (_finishDelay > 8f)
            {
                _flySpeed = 1f;
                CancelInvoke(nameof(LoadDir));
                CancelInvoke(nameof(SetRndPosition));

                if (_finishDelay > 9.5f)
                {
                    this.gameObject.SetActive(false);
                    this.transform.position = Vector3.one * 8f;
                }
            }

            if (_aniSpeedChange)
            {
                _animation["fly_flap"].speed = 0.4f;
                _aniSpeedChange = false;
            }

            _skillDelay = 2f;
            this.transform.rotation = Quaternion.Lerp(transform.rotation, _rotate, Time.deltaTime * 1.6f);
            this.transform.position += transform.forward * Time.deltaTime * _flySpeed;
        }

        #endregion
    }
}