using System.Collections.Generic;
using System.Reflection;
using log4net;
using UnityEngine;

public class ForceField : MonoBehaviour
{
	private static ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

	[Tooltip("Multiplied by the current gravity strength factor for the ship.")]
	[Range(0, 10)]
	public float StrengthFactor = 2;

	private List<Ship> ships = new();


	private void FixedUpdate()
	{
		foreach (Ship ship in ships)
		{
			// Direction towards center
			var direction = transform.up;
			ship._body.AddForce(direction * ship.Props.GravitStrength * StrengthFactor
				, ForceMode.Acceleration);
		}
	}


	/// <summary>
	/// Adds a ship to the force field when in range
	/// </summary>
	/// <param name="collider"></param>
	private void OnTriggerEnter(Collider collider)
	{
		if (collider.tag == "Ship")
		{
			if (!collider.TryGetComponent(out Ship shipComponent))
			{
				Log.Error($"Collider: {collider} was tagged as Ship, but has no Ship component.");
				return;
			}
			ships.Add(shipComponent);
		}
	}

	/// <summary>
	/// Removes the player when he leaves the force field
	/// </summary>
	/// <param name="collider"></param>
	private void OnTriggerExit(Collider collider)
	{
		if (collider.tag == "Ship")
		{
			if (!collider.TryGetComponent(out Ship shipComponent))
			{
				Log.Error($"Collider: {collider} was tagged as Ship, but has no Ship component.");
				return;
			}
			ships.Remove(shipComponent);
		}
	}
}