using UnityCommon;
using UnityEngine;
using UnityGameFramework.Runtime;
using Cinemachine;

namespace GFMain
{
    public class CameraCtrlComponent : GameFrameworkComponent
    {
        [SerializeField]
        private GameObject goCameraController;
        [HideInInspector]
        public CameraController cameraController;

        /// <summary>
        /// 当前相机状态
        /// </summary>
        public UnityCommon.CameraState cameraStateCurrent
        {
            get { return cameraController.cameraStateCurrent; }
        }

        protected override void Awake()
        {
            base.Awake();
            goCameraController = Instantiate(goCameraController, transform);
            cameraController = goCameraController.GetComponent<CameraController>();
            stateNone = new NoneState(cameraController.cameraMain);
        }
        private NoneState stateNone;
        /// <summary>
        /// 飞行视角
        /// </summary>
        /// <param name="p"></param>
        /// <param name="q"></param>
        public void ToFly(Vector3 p, Quaternion q)
        {
            var flyState = new FlyState(cameraController.cameraMain, p, q);
            cameraController.Enter(flyState);
        }
        /// <summary>
        /// 飞行视角，注视目标对象
        /// </summary>
        /// <param name="pFocus"></param>
        /// <param name="distance"></param>
        public void ToFly_lookat(Vector3 pFocus, float distance)
        {
            Vector3 pOrignal = pFocus + ((cameraController.cameraMain.transform.position - pFocus).normalized * distance);

            //var r = Quaternion.Euler(pFocus - pOrignal);
            var r = Quaternion.LookRotation(pFocus - pOrignal, Vector3.up);
            ToFly(pOrignal, r);
        }
        /// <summary>
        /// 特写视角
        /// </summary>
        /// <param name="pFocus">目标对象位置</param>
        /// <param name="pOrignal">初始相机位置</param>
        public void ToCloseUp(Vector3 pFocus, Vector3 pOrignal)
        {
            var closeUpState = new CloseUpState(cameraController.cameraMain, pFocus, pOrignal);
            cameraController.Enter(closeUpState);
        }
        /// <summary>
        /// 特写视角
        /// </summary>
        /// <param name="pFocus">目标对象位置</param>
        /// <param name="distance">离目标对象的初始距离</param>
        public void ToCloseUp(Vector3 pFocus, float distance)
        {
            Vector3 pOrignal = pFocus + ((cameraController.cameraMain.transform.position - pFocus).normalized * distance);
            ToCloseUp(pFocus, pOrignal);
        }
        /// <summary>
        /// 特写视角，根据目标Transform包围盒自动计算合适距离
        /// </summary>
        /// <param name="tf">目标对象</param>
        public void ToCloseUp(Transform tf)
        {
            var p = Utility.GetCenterPosition(tf);
            var bounds = Utility.GetBounds(tf);
            MainEntry.CameraCtrl.ToCloseUp(p, Mathf.Max(bounds.size.x, bounds.size.y, bounds.size.z) + 1);
        }
        /// <summary>
        /// 第一人称视角
        /// </summary>
        /// <param name="p">位置</param>
        /// <param name="q">旋转</param>
        public void ToFP(Vector3 p, Quaternion q)
        {
            var fpState = new FPState(cameraController.cameraMain, p, q, cameraController.fpsController);
            cameraController.Enter(fpState);
        }
        /// <summary>
        /// 第一人称视角
        /// </summary>
        /// <param name="tfTarget">目标对象</param>
        public void ToFP(Transform tfTarget)
        {
            ToFP(tfTarget.position, tfTarget.rotation);
        }
        /// <summary>
        /// 跟随视角
        /// </summary>
        /// <param name="tfTarget">跟随对象</param>
        public void ToFollow(Transform tfTarget)
        {
            var follow = new FollowState(cameraController.cameraMain, tfTarget);
            cameraController.Enter(follow);
        }
        /// <summary>
        /// 切换相机状态
        /// </summary>
        /// <param name="state"></param>
        public void To(UnityCommon.CameraState state)
        {
            cameraController.Enter(state);
        }
        /// <summary>
        /// 相机关闭
        /// </summary>
        public void ToNone()
        {
            cameraController.Enter(stateNone);
        }

        public void ToCinemachine()
        {
            cameraController.Enter(new CinemachineState(cameraController.cameraMain));
        }
        /// <summary>
        /// 返回前一个相机控制状态
        /// </summary>
        public void ToPreCamerastate()
        {
            cameraController.Enter(cameraStateCurrent?.preCameraState);
        }

        public UnityCommon.CameraState ToMotionless(Transform tfTarget)
        {
            return ToMotionless(tfTarget.position, tfTarget.rotation);
        }

        public UnityCommon.CameraState ToMotionless(Vector3 p, Quaternion r)
        {
            var state = new MotionlessState(cameraController.cameraMain, p, r);
            cameraController.Enter(state);
            return state;
        }
    }
}