using UnityEngine;
using Fusion;

namespace TPSBR
{
	[DefaultExecutionOrder(6000)]
	public sealed class Jetpack : ContextBehaviour
	{
		// CONSTANTS

		private const int BIT_IS_ACTIVE   = 0;
		private const int BIT_FULL_THRUST = 1;
		private const int BIT_HAS_STARTED = 2;

		// PUBLIC MEMBERS

		public bool IsActive   { get { return _state.IsBitSet(BIT_IS_ACTIVE);   } set { byte state = _state; state.SetBit(BIT_IS_ACTIVE,   value); _state = state; } }
		public bool FullThrust { get { return _state.IsBitSet(BIT_FULL_THRUST); } set { byte state = _state; state.SetBit(BIT_FULL_THRUST, value); _state = state; } }
		public bool HasStarted { get { return _state.IsBitSet(BIT_HAS_STARTED); } set { byte state = _state; state.SetBit(BIT_HAS_STARTED, value); _state = state; } }

		public bool  IsRunning => IsActive == true && _fuel > 0f;
		public float Fuel      => _fuel;
		public float MaxFuel   => _maxFuel;

		// PRIVATE MEMBERS

		[SerializeField]
		private float _initialFuel = 100f;
		[SerializeField]
		private float _maxFuel = 100f;
		[SerializeField]
		private float _idleThrustConsumption = 7f;
		[SerializeField]
		private float _fullThrustConsumption = 15f;
		[SerializeField]
		private GameObject _jetpackObject;
		[SerializeField]
		private Animation _jetpackAnimation;
		[SerializeField]
		private Transform _visualsRoot;
		[SerializeField]
		private Vector3 _centerOfGravityOffset = new Vector3(0f, 1.5f, 0f);
		[SerializeField]
		private ShakeSetup _cameraPositionShake;
		[SerializeField]
		private ShakeSetup _cameraRotationShake;
		[SerializeField]
		private float _fullThrustShakeMultiplier = 2f;

		[Header("Propellers")]
		[SerializeField]
		private Transform _rightMount;
		[SerializeField]
		private Transform _leftMount;
		[SerializeField]
		private Transform _rightPropeller;
		[SerializeField]
		private Transform _leftPropeller;
		[SerializeField]
		private float _mountForwardAngle = 30f;
		[SerializeField]
		private float _mountBackwardAngle = -15;
		[SerializeField]
		private float _mountChangeSpeed = 8f;
		[SerializeField]
		private float _idlePropellerSpeed = 720f;
		[SerializeField]
		private float _fullPropellerSpeed = 3500f;
		[SerializeField]
		private float _propellerSpeedChange = 8f;

		[Header("Audio")]
		[SerializeField]
		private AudioSource _engineSound;
		[SerializeField]
		private float _engineSoundChangeSpeed = 8f;
		[SerializeField]
		private float _fullThrustPitch = 1.5f;
		[SerializeField]
		private float _idleThrustVolume = 0.6f;
		[SerializeField]
		private float _fullThrustVolume = 1f;

		[Networked, HideInInspector]
		private byte _state { get; set; }

		[Networked]
		private float _fuel { get; set; }

		private Agent _agent;
		private byte  _localState;

		private float _mountAngle;
		private float _propellerSpeed;

		private float _defaultPitch;

		private float _positionShakeMagnitude;
		private float _rotationShakeMagnitude;

		private Vector3 _tiltAngles;

		// PUBLIC METHODS

		public void OnSpawned(Agent agent)
		{
			_agent      = agent;
			_localState = default;

			_jetpackObject.SetActive(false);

			AddFuel(_initialFuel);

			UpdateLocalState();
		}

		public void OnFixedUpdate()
		{
			if (IsActive == false)
				return;

			if (_agent.Health.IsAlive == false)
			{
				Deactivate();
				return;
			}

			bool isGrounded = _agent.Character.CharacterController.Data.IsGrounded;
			if (HasStarted == false)
			{
				HasStarted = isGrounded == false;
			}
			else if (isGrounded == true)
			{
				Deactivate();
				return; // Deactivate after touch down
			}

			HasStarted |= _agent.Character.CharacterController.Data.IsGrounded == false;

			UpdateLocalState();

			// Ensure no weapon can be held
			_agent.Weapons.DisarmCurrentWeapon();

			float consumption = FullThrust == true ? _fullThrustConsumption : _idleThrustConsumption;
			_fuel -= consumption * Runner.DeltaTime;

			if (_fuel <= 0f)
			{
				_fuel = 0f;
				//Deactivate();
			}
		}

		public void OnDespawned()
		{
			Deactivate();
		}

		public bool AddFuel(float fuel)
		{
			if (_fuel >= _maxFuel)
				return false;

			_fuel = Mathf.Min(_fuel + fuel, _maxFuel);

			return true;
		}

		public bool Activate()
		{
			if (IsActive == true)
				return false;

			if (_fuel <= 0)
				return false;

			IsActive = true;

			UpdateLocalState();

			return true;
		}

		public void Deactivate()
		{
			if (IsActive == false)
				return;

			IsActive = false;
			FullThrust = false;
			HasStarted = false;

			UpdateLocalState();
		}

		public override void Render()
		{
			UpdateLocalState();

			float moveDirectionY = _agent.HasInputAuthority == true ? _agent.AgentInput.AccumulatedInput.MoveDirection.y : default;

			float targetMountAngle = MathUtility.Map(-1, 1, _mountBackwardAngle, _mountForwardAngle, moveDirectionY);
			_mountAngle = Mathf.Lerp(_mountAngle, targetMountAngle, Time.deltaTime * _mountChangeSpeed);

			_rightMount.localRotation = Quaternion.Euler(new Vector3(_mountAngle, 0f, 0f));
			_leftMount.localRotation = _rightMount.localRotation;

			float targetPropellerSpeed = _fuel > 0f ? (FullThrust == true ? _fullPropellerSpeed : _idlePropellerSpeed) : 0f;
			_propellerSpeed = Mathf.Lerp(_propellerSpeed, targetPropellerSpeed, Time.deltaTime * _propellerSpeedChange);

			_rightPropeller.Rotate(Vector3.up, _propellerSpeed * Time.deltaTime, Space.Self);
			_leftPropeller.Rotate(Vector3.up, _propellerSpeed * Time.deltaTime, Space.Self);

			float targetVolume = IsRunning == true ? (FullThrust == true ? _fullThrustVolume : _idleThrustVolume) : 0f;
			float targetPitch = IsRunning == true && FullThrust == true ? _fullThrustPitch : _defaultPitch;

			_engineSound.volume = Mathf.Lerp(_engineSound.volume, targetVolume, Time.deltaTime * _engineSoundChangeSpeed);
			_engineSound.pitch = Mathf.Lerp(_engineSound.pitch, targetPitch, Time.deltaTime * _engineSoundChangeSpeed);

			_visualsRoot.localPosition = Vector3.zero;
			_visualsRoot.localRotation = Quaternion.identity;

			var localVelocity = IsRunning == true ? Quaternion.Inverse(transform.rotation) * _agent.Character.CharacterController.Data.RealVelocity : Vector3.zero;

			_tiltAngles.x = Mathf.Lerp(_tiltAngles.x, -localVelocity.x, Time.deltaTime * 8f);
			_tiltAngles.z = Mathf.Lerp(_tiltAngles.z, localVelocity.z * 2f, Time.deltaTime * 8f);

			_visualsRoot.RotateAround(transform.position + _centerOfGravityOffset, transform.forward, _tiltAngles.x);
			_visualsRoot.RotateAround(transform.position + _centerOfGravityOffset, transform.right, _tiltAngles.z);

			_cameraPositionShake.Magnitude = FullThrust == true ? _positionShakeMagnitude * _fullThrustShakeMultiplier : _positionShakeMagnitude;
			_cameraRotationShake.Magnitude = FullThrust == true ? _rotationShakeMagnitude * _fullThrustShakeMultiplier : _rotationShakeMagnitude;
		}

		// MONOBEHAVIOUR

		private void Awake()
		{
			_positionShakeMagnitude = _cameraPositionShake.Magnitude;
			_rotationShakeMagnitude = _cameraRotationShake.Magnitude;

			_defaultPitch = _engineSound.pitch;
		}

		// PRIVATE METHODS

		private void Activate_Internal()
		{
			_jetpackAnimation.PlayForward();
			_engineSound.Play();

			if (HasInputAuthority == true)
			{
				var shake = Context.Camera.ShakeEffect;

				shake.Play(_cameraPositionShake);
				shake.Play(_cameraRotationShake);
			}
		}

		private void Deactivate_Internal()
		{
			_jetpackAnimation.Play(_jetpackAnimation.clip.name, -3f);
			_engineSound.Stop();

			if (HasInputAuthority == true)
			{
				var shake = Context.Camera.ShakeEffect;

				shake.Stop(_cameraPositionShake);
				shake.Stop(_cameraRotationShake);
			}
		}

		// NETWORK CALLBACKS

		private void UpdateLocalState()
		{
			bool stateIsActive      = _state.IsBitSet(BIT_IS_ACTIVE);
			bool localStateIsActive = _localState.IsBitSet(BIT_IS_ACTIVE);

			_localState = _state;

			if (stateIsActive != localStateIsActive)
			{
				if (stateIsActive == true)
				{
					Activate_Internal();
				}
				else
				{
					Deactivate_Internal();
				}
			}
		}
	}
}