using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Lightbug.Utilities;


namespace Lightbug.CharacterControllerPro.Demo
{

    public class RigidbodyModifier : MonoBehaviour
    {
        [SerializeField]
        AddMode mode = AddMode.AddForce;

        [SerializeField]
        Vector3 localAddVector = Vector3.zero;

        [Min(0.01f)]
        [SerializeField]
        float dragMultiplier = 1f;

        [Min(0.01f)]
        [SerializeField]
        float massMultiplier = 1f;

        enum AddMode
        {
            AddForce,
            Accelerate,
            AddVelocity
        }

        Vector3 worldAddVector = default(Vector3);

        Dictionary<Transform, Rigidbody> rigidbodies = new Dictionary<Transform, Rigidbody>();

        void OnTriggerEnter(Collider otherCollider)
        {

            Rigidbody rigidbody = rigidbodies.GetOrRegisterValue<Transform, Rigidbody>(otherCollider.transform);

            if (rigidbody == null)
                return;

            rigidbody.mass *= massMultiplier;
            rigidbody.drag *= dragMultiplier;

        }


        void OnTriggerExit(Collider otherCollider)
        {
            Rigidbody rigidbody;
            rigidbodies.TryGetValue(otherCollider.transform, out rigidbody);

            if (rigidbody == null)
                return;

            rigidbody.mass /= massMultiplier;
            rigidbody.drag /= dragMultiplier;

            rigidbodies.Remove(otherCollider.transform);

        }

        void Start()
        {
            worldAddVector = transform.TransformDirection(localAddVector);
        }

        void FixedUpdate()
        {
            foreach (var rigidbody in rigidbodies)
            {
                switch (mode)
                {
                    case AddMode.AddForce:
                        rigidbody.Value.AddForce(worldAddVector);
                        break;
                    case AddMode.Accelerate:
                        rigidbody.Value.velocity += worldAddVector * Time.deltaTime;
                        break;
                    case AddMode.AddVelocity:
                        rigidbody.Value.velocity += worldAddVector;
                        break;
                }

            }
        }
    }

}