using UnityEngine;

public class ShieldGuardSkill : UnitSkill
{
    [Header("盾牌参数")]
    [Min(1f)]
    public float shieldDurability = 220f;

    [Min(0.1f)]
    public float shieldDuration = 4f;

    [Range(0f, 1f)]
    public float damageReduction = 0.35f;

    public Vector3 shieldLocalPosition = new Vector3(0f, 1f, 0.7f);

    public Vector3 shieldSize = new Vector3(1.5f, 1.8f, 0.12f);

    private ShieldBarrier shield;

    public ShieldBarrier ActiveShield => shield;

    public override void ReleaseSkill()
    {
        EnsureShield();
        shield.Refresh(shieldDurability, shieldDuration, shieldLocalPosition, shieldSize);
    }

    public override float ModifyIncomingDamage(float damage, GameObject attacker)
    {
        if (shield == null || !shield.IsActive)
        {
            return damage;
        }

        if (shield.TryBlock(attacker, damage))
        {
            return damage * (1f - damageReduction);
        }

        return damage;
    }

    private void EnsureShield()
    {
        if (shield != null)
        {
            return;
        }

        GameObject shieldObject = new GameObject("ShieldBarrier");
        shieldObject.transform.SetParent(unit.transform, false);

        BoxCollider boxCollider = shieldObject.AddComponent<BoxCollider>();
        boxCollider.isTrigger = true;
        boxCollider.size = shieldSize;

        shield = shieldObject.AddComponent<ShieldBarrier>();
        shield.Configure(unit, boxCollider);
        shieldObject.SetActive(false);
    }
}