/******************************************************************************/
/*
  Project   - Boing Kit
  Publisher - Long Bunny Labs
              http://LongBunnyLabs.com
  Author    - Ming-Lun "Allen" Chou
              http://AllenChou.net
*/
/******************************************************************************/

using UnityEngine;

namespace MudBun
{
  public class MudFloater : MonoBehaviour
  {
    [Range(0.0f, 10.0f)] public float Hover = 1.0f;
    [Range(0.0f, 10.0f)] public float Omega = 1.0f; // angular velocity in radians
    public bool UseLocalSpace = false;
    private Vector3 m_hoverCenter;
    private Quaternion m_hoverRot;
    private float m_hoverPhase;

    public enum RandomSeedEnum
    {
      Random, 
      Position, 
      Custom
    }

    public RandomSeedEnum RandomSeed = RandomSeedEnum.Random;
    [ConditionalField("RandomSeed", (int) RandomSeedEnum.Random, Label = "  Value")] public int CustomRandomSeed = 0;

    void Start()
    {
      m_hoverCenter = UseLocalSpace ? transform.localPosition : transform.position;
      m_hoverRot = UseLocalSpace ? transform.localRotation : transform.rotation;

      switch (RandomSeed)
      {
        case RandomSeedEnum.Position:
          Random.InitState(Codec.Hash(transform.position));
          break;

        case RandomSeedEnum.Custom:
          Random.InitState(CustomRandomSeed);
          break;
      }

      m_hoverPhase = Random.value * 1000.0f;
    }

    private void OnEnable()
    {
      Start();
    }

    void FixedUpdate()
    {
      m_hoverPhase += Omega * Time.deltaTime;
      Vector3 hoverVec = 
          0.05f * Mathf.Sin(1.37f * m_hoverPhase) * Vector3.right 
        + 0.05f * Mathf.Sin(1.93f * m_hoverPhase + 1.234f) * Vector3.forward 
        + 0.04f * Mathf.Sin(0.97f * m_hoverPhase + 4.321f) * Vector3.up;
      hoverVec *= Hover;
      Quaternion hoverQuat = Quaternion.FromToRotation(Vector3.up, hoverVec + Vector3.up);
      if (UseLocalSpace)
      {
        transform.localPosition = m_hoverCenter + hoverVec;
        transform.localRotation = m_hoverRot * hoverQuat;
      }
      else
      {
        transform.position = m_hoverCenter + hoverVec;
        transform.rotation = m_hoverRot * hoverQuat;
      }
    }
  }
}