using System;
using System.Collections.Generic;
using UnityEngine;

public class StraightBullet : BulletBase
{
    [SerializeField] float maxDistance = 0f;

    float flyingDistance = 0.0f;
    HashSet<Collider2D> currentColliders = new();

    protected override bool UpdateBullet(float deltaTime)
    {
        float moveUnit = Speed * deltaTime;

        if (!UpdateFlyingDistance(moveUnit)) return false;

        transform.position += (Vector3)HeadDirection * moveUnit;
        return true;
    }

    private bool UpdateFlyingDistance(float moveUnit)
    {
        if(flyingDistance <= 0) return true;
        flyingDistance += moveUnit;
        return flyingDistance < maxDistance;
    }

    public override void Fire(Transform target = null, bool resetLifeTime = true)
    {
        base.Fire(target, resetLifeTime);
        flyingDistance = 0;
    }

    public void CheckColliding(Action<Collider2D> collided)
    {
        foreach (var target in currentColliders)
        {
            collided.Invoke(target);
        }
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if(!other.TryGetComponent<Entity>(out var entity)) return;

        currentColliders.Add(other);
        OnEnterCollider?.Invoke(entity);
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        currentColliders.Remove(collision);
    }
}