using UnityEngine;
using System.Collections;
using WaterSystem;
using Unity.Mathematics;
using Unity.Entities;

namespace BoatAttack.Boat
{
    public class Engine : MonoBehaviour//, IConvertGameObjectToEntity
	{
		private Rigidbody RB; // The rigid body attatched to the boat
		public Vector3 vel; // Boats velocity

		public AudioSource engineSound; // Engine sound clip
		public AudioSource waterSound; // Water sound clip

		//engine stats
		public float torque = 5f;
		public float horsePower = 15f;
		private float3[] point = new float3[1]; // engine submerged check
		private float3[] heights = new float3[1]; // engine submerged check
		private int _guid;
		private float yHeight;

		public Vector3 enginePosition;
		private Vector3 engineDir;

		void Awake()
        {
			RB = gameObject.GetComponent<Rigidbody>(); // get the RB
			engineSound.time = UnityEngine.Random.Range(0f, engineSound.clip.length); // randomly start the engine sound
			waterSound.time = UnityEngine.Random.Range(0f, waterSound.clip.length); // randomly start the water sound

			_guid = this.GetInstanceID(); // Get the engines GUID for the buoyancy system
		}

        void FixedUpdate()
        {
			vel = RB.velocity; // store the velocity
			float velMag = vel.sqrMagnitude; // get the sqr mag
			engineSound.pitch = Mathf.Max(velMag * 0.01f, 0.3f); // use some magice numbers to control the pitch of the engine sound

			// Get the water level from the engines position and store it
			point[0] = transform.TransformPoint(enginePosition);
			GerstnerWavesJobs.UpdateSamplePoints(point, _guid, false);
			GerstnerWavesJobs.GetData(_guid, ref heights);
			yHeight = heights[0].y - point[0].y;
		}

        /// <summary>
        /// Controls the acceleration of the boat
        /// </summary>
        /// <param name="modifier">Acceleration modifier, adds force in the 0-1 range</param>
        public void Accel(float modifier)
        {
			if (yHeight > -0.1f) // if the engine is deeper than 0.1
			{
				modifier = Mathf.Clamp(modifier, 0f, 1f); // clamp for reasonable values
				Vector3 forward = transform.forward;
				forward.y = 0f;
				forward.Normalize();
				RB.AddForce(forward * modifier * horsePower, ForceMode.Acceleration); // add force forward based on input and horsepower
				RB.AddRelativeTorque(-Vector3.right * modifier, ForceMode.Acceleration);
			}
		}

        /// <summary>
        /// Controls the turning of the boat
        /// </summary>
        /// <param name="modifier">Steering modifier, positive for right, negative for negative</param>
        public void Turn(float modifier)
        {
			if (yHeight > -0.1f) // if the engine is deeper than 0.1
			{
				modifier = Mathf.Clamp(modifier, -1f, 1f); // clamp for reasonable values
				RB.AddRelativeTorque(new Vector3(0f, torque, -torque * 0.5f) * modifier, ForceMode.Acceleration); // add torque based on input and torque amount
			}
		}

        // Draw some helper gizmos
        void OnDrawGizmosSelected()
        {
            Gizmos.color = Color.green;
            Gizmos.matrix = transform.localToWorldMatrix;
            Gizmos.DrawCube(enginePosition, new Vector3(0.1f, 0.2f, 0.3f)); // Draw teh engine position with sphere
        }

		//Called by parent BuoyantObject_DOTS
		public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
		{
			//Set up driving data
			bool isHuman = GetComponent<BoatController>().Human;

			if(!isHuman)
				AIController_DOTS.Register(entity);

			var data = new DrivingData {
				isHuman = isHuman,
				torque = torque,
				horsePower = horsePower,
				engineOffset = transform.TransformPoint(enginePosition) - transform.position
			};

			dstManager.AddComponentData(entity, data);
		}
	}
}