using DG.Tweening;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace UnityCommon
{
    public abstract class CameraState
    {
        public Action onExit;
        public CameraState preCameraState;
        protected float speedScaleFactor = 1;
        public CameraState(Camera camera)
        {
            m_camera = camera;
        }

        public virtual void Enter()
        {
            speedScaleFactor = 1;
            m_camera.enabled = true;
        }

        public virtual void Exit()
        {
            m_camera.enabled = false;
            onExit?.Invoke();
        }
        public virtual void Update() { }

        protected Camera m_camera { get; set; }
        /// <summary>
        /// 切换完毕
        /// </summary>
        public bool m_isAllReady { get; set; }
        /// <summary>
        /// 镜头前后、左右、上下移动
        /// </summary>
        /// <param name="vecDir">x前后 y左右 z上下</param>
        public virtual void OnMove(Vector3 vecDir) { }
        /// <summary>
        /// 镜头旋转
        /// </summary>
        /// <param name="vector2">x左右 y上下</param>
        public virtual void OnRotate(Vector2 vector2) { }
        /// <summary>
        /// 缩放
        /// </summary>
        /// <param name="zoom"></param>
        public virtual void OnZoom(float zoom) { }
        /// <summary>
        /// 平移
        /// </summary>
        /// <param name="vector2"></param>
        public virtual void OnTranlation(Vector2 vector2) { }
        /// <summary>
        /// 加速
        /// </summary>
        /// <param name="isAdd"></param>
        public virtual void OnAddSpeed(float addSpeed) { }
        /// <summary>
        /// 缩放速度因子，移动、旋转、镜头推拉的速度缩放比例
        /// </summary>
        /// <param name="speedScale"></param>
        public virtual void OnChangeSpeedScale(float speedScale)
        {
            if (speedScale > 0) Math.Clamp(speedScaleFactor *= 2, 0.125f, 16);
            else if (speedScale < 0) Math.Clamp(speedScaleFactor /= 2, 0.125f, 16);
        }



        public void SetAnimDuration(float duration)
        {
            animDuration = duration;
        }

        float animDuration = 1;
        Sequence sequence;

        protected void SetCameraPosition(Vector3 position, Quaternion rotation, Action onCompleted = null)
        {
            if (animDuration <= 0)
            {
                m_camera.transform.position = position;
                m_camera.transform.rotation = rotation;
                m_isAllReady = true;
                onCompleted?.Invoke();
            }
            else
            {
                m_isAllReady = false;
                sequence?.Kill();
                sequence = DOTween.Sequence();
                sequence.Join(m_camera.transform.DOMove(position, animDuration));
                sequence.Join(m_camera.transform.DORotate(rotation.eulerAngles, animDuration));
                sequence.OnComplete(() =>
                {
                    m_isAllReady = true;
                    onCompleted?.Invoke();
                });
            }
        }
    }
}