using System;
using RebootKit.Engine.Foundation;
using RebootKit.Engine.Services.Simulation.Sensors;
using RebootReality.jelycho.Main;
using Unity.Cinemachine;
using UnityEngine;
using UnityEngine.Assertions;

namespace RebootReality.jelycho.Player {
    [AddComponentMenu(GameConsts.k_AddComponentMenu + "Player/First Person Camera")]
    public class FPPCamera : MonoBehaviour {
        [ConfigVar("fpp.camera.fov", 60.0f, "Field of view for the first person camera.")]
        static ConfigVar s_cameraFOV;
        
        [Header("Base")]
        [field: SerializeField]
        public float Sensitivity { get; set; }

        [SerializeField] float m_PitchMin = -80f;
        [SerializeField] float m_PitchMax = 80f;
        
        [field: SerializeField]
        public CinemachineCamera Camera { get; private set; }

        CinemachineBasicMultiChannelPerlin m_BobbingNoiseComponent;
        
        [SerializeField] float m_BobbingFrequency = 0.5f;
        [SerializeField] float m_BobbingAmplitude = 0.75f;
       
        [Header("Picking")]
        [SerializeField] float m_PickDistance = 5.0f;
        [SerializeField] LayerMask m_PickLayer;

        readonly RaycastSensor m_RaycastSensor = new RaycastSensor();

        [NonSerialized] public float Pitch;
        [NonSerialized] public float Yaw;

        public ISensor Sensor {
            get {
                m_RaycastSensor.ray = new Ray(Camera.transform.position, Camera.transform.forward);
                m_RaycastSensor.maxDistance = m_PickDistance;
                m_RaycastSensor.layerMask = m_PickLayer;
                return m_RaycastSensor;
            }
        }

        void Awake() {
            m_BobbingNoiseComponent =
                Camera.GetCinemachineComponent(CinemachineCore.Stage.Noise) as CinemachineBasicMultiChannelPerlin;
            Assert.IsNotNull(m_BobbingNoiseComponent);

            SetBobbing(0.0f);
        }

        public void Tick() {
            Camera.Lens.FieldOfView = s_cameraFOV.FloatValue;
            // Camera.transform.localRotation = Quaternion.Euler(Pitch, 0f, 0f);
        }

        public void Rotate(float x, float y) {
            float sens = Sensitivity;

            Pitch -= y * sens;
            Pitch = Mathf.Clamp(Pitch, m_PitchMin, m_PitchMax);

            Yaw += x * sens;
        }

        public void SetLookDirection(Vector3 forward) {
            Pitch = Mathf.Asin(-forward.y) * Mathf.Rad2Deg;
            Yaw = Mathf.Atan2(forward.x, forward.z) * Mathf.Rad2Deg;
        }

        public void SetBobbing(float t) {
            m_BobbingNoiseComponent.AmplitudeGain = m_BobbingAmplitude * t;
            m_BobbingNoiseComponent.FrequencyGain = m_BobbingFrequency * t;
        }
    }
}