using ActionGameFramework.Health;
using Core.Health;
using UnityEngine;

namespace TowerDefense.Towers.Projectiles
{
	/// <summary>
	/// Component that will apply splash damage on collision enter
	/// </summary>
	public class SplashDamager : MonoBehaviour
	{
		/// <summary>
		/// The Area this projectile will attack in
		/// </summary>
		public float attackRange = 0.6f;

		/// <summary>
		/// The amount of damage done, a percentage of the damager damage
		/// </summary>
		public float damageAmount;

		/// <summary>
		/// The physics layer mask to search on
		/// </summary>
		public LayerMask mask = -1;

		/// <summary>
		/// The alignment of the projectile
		/// </summary>
		public SerializableIAlignmentProvider alignment;

		static readonly Collider[] s_Enemies = new Collider[64];

		public float damage
		{
			get { return damageAmount; }
		}

		/// <summary>
		/// Gets this damager's alignment
		/// </summary>
		public IAlignmentProvider alignmentProvider
		{
			get { return alignment != null ? alignment.GetInterface() : null; }
		}

		/// <summary>
		/// Searches for Targetables within a radius of <see cref="attackRange"/>
		/// and damages them if valid
		/// </summary>
		protected virtual void OnCollisionEnter(Collision other)
		{
			int number = Physics.OverlapSphereNonAlloc(transform.position, attackRange, s_Enemies, mask);
			for (int index = 0; index < number; index++)
			{
				Collider enemy = s_Enemies[index];
				var damageable = enemy.GetComponent<Targetable>();
				if (damageable == null)
				{
					continue;
				}
				damageable.TakeDamage(damageAmount, damageable.position, alignmentProvider);
			}
		}

		/// <summary>
		/// 看看Trigger的加入能不能有助于处理:
		/// </summary>
		/// <param name="other"></param>
        protected void OnTriggerEnter(Collider other)
        {
			int number = Physics.OverlapSphereNonAlloc(transform.position, attackRange, s_Enemies, mask);
			for (int index = 0; index < number; index++)
			{
				Collider enemy = s_Enemies[index];
				var damageable = enemy.GetComponent<Targetable>();
				if (damageable == null)
				{
					continue;
				}
				damageable.TakeDamage(damageAmount, damageable.position, alignmentProvider);
			}
		}
    }
}