using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Cinemachine;
using MoreMountains.Feedbacks;

namespace MoreMountains.FeedbacksForThirdParty
{
    /// <summary>
    /// Add this to a Cinemachine virtual camera and it'll let you control its near and far clipping planes
    /// </summary>
    [AddComponentMenu("More Mountains/Feedbacks/Shakers/Cinemachine/MMCinemachineClippingPlanesShaker")]
    [RequireComponent(typeof(CinemachineVirtualCamera))]
    public class MMCinemachineClippingPlanesShaker : MMShaker
    {
        [Header("Clipping Planes")]
        /// whether or not to add to the initial value
        public bool RelativeClippingPlanes = false;

        [Header("Near Plane")]
        /// the curve used to animate the intensity value on
        [Tooltip("the curve used to animate the intensity value on")]
        public AnimationCurve ShakeNear = new AnimationCurve(new Keyframe(0, 0), new Keyframe(0.5f, 1), new Keyframe(1, 0));
        /// the value to remap the curve's 0 to        
        [Tooltip("the value to remap the curve's 0 to")]
        public float RemapNearZero = 0.3f;
        /// the value to remap the curve's 1 to        
        [Tooltip("the value to remap the curve's 1 to")]
        public float RemapNearOne = 100f;

        [Header("Far Plane")]
        /// the curve used to animate the intensity value on
        [Tooltip("the curve used to animate the intensity value on")]
        public AnimationCurve ShakeFar = new AnimationCurve(new Keyframe(0, 0), new Keyframe(0.5f, 1), new Keyframe(1, 0));
        /// the value to remap the curve's 0 to        
        [Tooltip("the value to remap the curve's 0 to")]
        public float RemapFarZero = 1000f;
        /// the value to remap the curve's 1 to        
        [Tooltip("the value to remap the curve's 1 to")]
        public float RemapFarOne = 1000f;

        protected CinemachineVirtualCamera _targetCamera;
        protected float _initialNear;
        protected float _initialFar;
        protected float _originalShakeDuration;
        protected bool _originalRelativeClippingPlanes;
        protected AnimationCurve _originalShakeNear;
        protected float _originalRemapNearZero;
        protected float _originalRemapNearOne;
        protected AnimationCurve _originalShakeFar;
        protected float _originalRemapFarZero;
        protected float _originalRemapFarOne;

        /// <summary>
        /// On init we initialize our values
        /// </summary>
        protected override void Initialization()
        {
            base.Initialization();
            _targetCamera = this.gameObject.GetComponent<CinemachineVirtualCamera>();
        }

        /// <summary>
        /// When that shaker gets added, we initialize its shake duration
        /// </summary>
        protected virtual void Reset()
        {
            ShakeDuration = 0.5f;
        }

        /// <summary>
        /// Shakes values over time
        /// </summary>
        protected override void Shake()
        {
            float newNear = ShakeFloat(ShakeNear, RemapNearZero, RemapNearOne, RelativeClippingPlanes, _initialNear);
            _targetCamera.m_Lens.NearClipPlane = newNear;
            float newFar = ShakeFloat(ShakeFar, RemapFarZero, RemapFarOne, RelativeClippingPlanes, _initialFar);
            _targetCamera.m_Lens.FarClipPlane = newFar;
        }

        /// <summary>
        /// Collects initial values on the target
        /// </summary>
        protected override void GrabInitialValues()
        {
            _initialNear = _targetCamera.m_Lens.NearClipPlane;
            _initialFar = _targetCamera.m_Lens.FarClipPlane;
        }

        /// <summary>
        /// When we get the appropriate event, we trigger a shake
        /// </summary>
        /// <param name="distortionCurve"></param>
        /// <param name="duration"></param>
        /// <param name="amplitude"></param>
        /// <param name="relativeDistortion"></param>
        /// <param name="feedbacksIntensity"></param>
        /// <param name="channel"></param>
        public virtual void OnMMCameraClippingPlanesShakeEvent(AnimationCurve animNearCurve, float duration, float remapNearMin, float remapNearMax, AnimationCurve animFarCurve, float remapFarMin, float remapFarMax, bool relativeValues = false,
            float feedbacksIntensity = 1.0f, int channel = 0, bool resetShakerValuesAfterShake = true, bool resetTargetValuesAfterShake = true, bool forwardDirection = true, TimescaleModes timescaleMode = TimescaleModes.Scaled)
        {
            if (!CheckEventAllowed(channel) || (!Interruptible && Shaking))
            {
                return;
            }
            
            _resetShakerValuesAfterShake = resetShakerValuesAfterShake;
            _resetTargetValuesAfterShake = resetTargetValuesAfterShake;

            if (resetShakerValuesAfterShake)
            {
                _originalShakeDuration = ShakeDuration;
                _originalShakeNear = ShakeNear;
                _originalShakeFar = ShakeFar;
                _originalRemapNearZero = RemapNearZero;
                _originalRemapNearOne = RemapNearOne;
                _originalRemapFarZero = RemapFarZero;
                _originalRemapFarOne = RemapFarOne;
                _originalRelativeClippingPlanes = RelativeClippingPlanes;
            }

            TimescaleMode = timescaleMode;
            ShakeDuration = duration;
            ShakeNear = animNearCurve;
            RemapNearZero = remapNearMin * feedbacksIntensity;
            RemapNearOne = remapNearMax * feedbacksIntensity;
            ShakeFar = animFarCurve;
            RemapFarZero = remapFarMin * feedbacksIntensity;
            RemapFarOne = remapFarMax * feedbacksIntensity;
            RelativeClippingPlanes = relativeValues;
            ForwardDirection = forwardDirection;

            Play();
        }

        /// <summary>
        /// Resets the target's values
        /// </summary>
        protected override void ResetTargetValues()
        {
            base.ResetTargetValues();
            _targetCamera.m_Lens.NearClipPlane = _initialNear;
            _targetCamera.m_Lens.FarClipPlane = _initialFar;
        }

        /// <summary>
        /// Resets the shaker's values
        /// </summary>
        protected override void ResetShakerValues()
        {
            base.ResetShakerValues();
            ShakeDuration = _originalShakeDuration;
            ShakeNear = _originalShakeNear;
            ShakeFar = _originalShakeFar;
            RemapNearZero = _originalRemapNearZero;
            RemapNearOne = _originalRemapNearOne;
            RemapFarZero = _originalRemapFarZero;
            RemapFarOne = _originalRemapFarOne;
            RelativeClippingPlanes = _originalRelativeClippingPlanes;
        }

        /// <summary>
        /// Starts listening for events
        /// </summary>
        public override void StartListening()
        {
            base.StartListening();
            MMCameraClippingPlanesShakeEvent.Register(OnMMCameraClippingPlanesShakeEvent);
        }

        /// <summary>
        /// Stops listening for events
        /// </summary>
        public override void StopListening()
        {
            base.StopListening();
            MMCameraClippingPlanesShakeEvent.Unregister(OnMMCameraClippingPlanesShakeEvent);
        }
    }
}