using System;
using UnityEngine;

/// <summary>
/// Used on vulnerable trigger zones for ships.
/// </summary>
public class HitDetection : MonoBehaviour
{
	[SerializeField] private TackleKind tackleKind;
	public Action<TackleKind, Collider> TackledResponse;
	public Action TacklingResponse;
	[SerializeField] private HitKind hitKind = HitKind.IncomingNormal;
	public Action<HitKind, ProjectileDamage> HitResponse;
	//ID of Owner GameObject of this hit detecting zone 
	[HideInInspector]
	public int OwnerId = 0;

	void Awake()
	{
		OwnerId = transform.parent.gameObject.GetInstanceID();
	}

	/// <summary>
	/// Invokes the fitting tackle response on trigger entered.
	/// </summary>
	/// <param name="collider"></param>
	void OnTriggerEnter(Collider collider)
	{
		if (!(collider.tag == "Spike" ||
		 	collider.tag == "Bumper" ||
		  	collider.tag == "Vulnerable"))
		{
			return;
		}

		switch (collider.tag)
		{
			case "Spike":
				// Critical for weak spots
				TackledResponse.Invoke(tackleKind, collider);
				break;
			case "Bumper":
				// Always normal tackle
				TackledResponse.Invoke(TackleKind.IncomingNormal, collider);
				break;
			case "Vulnerable":
				if (tackleKind == TackleKind.OutgoingCritical ||
				tackleKind == TackleKind.OutgoingNormal)
					TacklingResponse.Invoke();
				break;
		}
	}
	public void RegisterHit(ProjectileDamage damage)
	{
		HitResponse(hitKind, damage);
	}
}

public enum TackleKind { IncomingCritical, IncomingNormal, OutgoingCritical, OutgoingNormal }
public enum HitKind { IncomingCritical, IncomingNormal }

public struct ProjectileDamage
{
	public float DamageValue;
	public float ImpactMagnitude;
	public Vector3 ImpactPoint;
	public Vector3 ImpactDirection;
}