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 field of view over time, can be piloted by a MMFeedbackCameraFieldOfView
    /// </summary>
    [AddComponentMenu("More Mountains/Feedbacks/Shakers/Cinemachine/MMCinemachineFieldOfViewShaker")]
    [RequireComponent(typeof(CinemachineVirtualCamera))]
    public class MMCinemachineFieldOfViewShaker : MMShaker
    {
        [Header("Field of View")]
        /// whether or not to add to the initial value
        [Tooltip("whether or not to add to the initial value")]
        public bool RelativeFieldOfView = false;
        /// the curve used to animate the intensity value on
        [Tooltip("the curve used to animate the intensity value on")]
        public AnimationCurve ShakeFieldOfView = 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")]
        [Range(0f, 179f)]
        public float RemapFieldOfViewZero = 60f;
        /// the value to remap the curve's 1 to
        [Tooltip("the value to remap the curve's 1 to")]
        [Range(0f, 179f)]
        public float RemapFieldOfViewOne = 120f;

        protected CinemachineVirtualCamera _targetCamera;
        protected float _initialFieldOfView;
        protected float _originalShakeDuration;
        protected bool _originalRelativeFieldOfView;
        protected AnimationCurve _originalShakeFieldOfView;
        protected float _originalRemapFieldOfViewZero;
        protected float _originalRemapFieldOfViewOne;

        /// <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 newFieldOfView = ShakeFloat(ShakeFieldOfView, RemapFieldOfViewZero, RemapFieldOfViewOne, RelativeFieldOfView, _initialFieldOfView);
            _targetCamera.m_Lens.FieldOfView = newFieldOfView;
        }

        /// <summary>
        /// Collects initial values on the target
        /// </summary>
        protected override void GrabInitialValues()
        {
            _initialFieldOfView = _targetCamera.m_Lens.FieldOfView;
        }

        /// <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 OnMMCameraFieldOfViewShakeEvent(AnimationCurve distortionCurve, float duration, float remapMin, float remapMax, bool relativeDistortion = 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;
                _originalShakeFieldOfView = ShakeFieldOfView;
                _originalRemapFieldOfViewZero = RemapFieldOfViewZero;
                _originalRemapFieldOfViewOne = RemapFieldOfViewOne;
                _originalRelativeFieldOfView = RelativeFieldOfView;
            }

            TimescaleMode = timescaleMode;
            ShakeDuration = duration;
            ShakeFieldOfView = distortionCurve;
            RemapFieldOfViewZero = remapMin * feedbacksIntensity;
            RemapFieldOfViewOne = remapMax * feedbacksIntensity;
            RelativeFieldOfView = relativeDistortion;
            ForwardDirection = forwardDirection;

            Play();
        }

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

        /// <summary>
        /// Resets the shaker's values
        /// </summary>
        protected override void ResetShakerValues()
        {
            base.ResetShakerValues();
            ShakeDuration = _originalShakeDuration;
            ShakeFieldOfView = _originalShakeFieldOfView;
            RemapFieldOfViewZero = _originalRemapFieldOfViewZero;
            RemapFieldOfViewOne = _originalRemapFieldOfViewOne;
            RelativeFieldOfView = _originalRelativeFieldOfView;
        }

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

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