using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;
using BaseGames.Combat;

namespace BaseGames.Tests.EditMode.Combat
{
    public class HurtBoxMultiplierTests
    {
        /// <summary>测试期建出的宿主对象；在 TearDown 统一销毁，断言失败也不会残留到编辑器场景。</summary>
        private GameObject _host;

        [SetUp]
        public void SetUp() => LogAssert.ignoreFailingMessages = true;

        [TearDown]
        public void TearDown()
        {
            // 项目关闭了 Domain/Scene Reload：断言失败会跳过用例后续语句，
            // 清理必须放在 TearDown，否则失败一次就往编辑器场景里漏一个对象。
            if (_host != null) Object.DestroyImmediate(_host);
            _host = null;
            LogAssert.ignoreFailingMessages = false;
        }

        /// <summary>
        /// HurtBox 标了 [RequireComponent(typeof(Collider2D))]，而 Collider2D 是抽象类，
        /// Unity 无法自动补齐——裸 AddComponent&lt;HurtBox&gt;() 会返回真 null。
        /// 必须先挂一个具体碰撞体。
        /// </summary>
        private HurtBox CreateHurtBox()
        {
            _host = new GameObject("hurtbox");
            _host.AddComponent<BoxCollider2D>();
            var hb = _host.AddComponent<HurtBox>();
            Assert.IsNotNull(hb, "HurtBox 需要先有具体 Collider2D 才能挂载");
            return hb;
        }

        [Test]
        public void DefaultMultiplier_IsOne()
        {
            var hb = CreateHurtBox();
            Assert.AreEqual(1f, hb.DamageMultiplier);
        }

        [Test]
        public void SetDamageMultiplier_ClampsToNonNegative()
        {
            var hb = CreateHurtBox();

            hb.SetDamageMultiplier(2.5f);
            Assert.AreEqual(2.5f, hb.DamageMultiplier);

            hb.SetDamageMultiplier(-3f);
            Assert.AreEqual(0f, hb.DamageMultiplier, "负倍率无意义，钳到 0");
        }

        [Test]
        public void ApplyMultiplier_ScalesRawAmount_AndFloorsAtOne()
        {
            var hb = CreateHurtBox();

            hb.SetDamageMultiplier(2f);
            Assert.AreEqual(20, hb.ApplyDamageMultiplier(10));

            hb.SetDamageMultiplier(0f);
            Assert.AreEqual(1, hb.ApplyDamageMultiplier(10), "倍率 0 也至少造成 1 点，与防御减免同规则");

            hb.SetDamageMultiplier(1f);
            Assert.AreEqual(10, hb.ApplyDamageMultiplier(10), "倍率 1 时数值原样通过");
            // 倍率 1 必须是"原样通过"，而不是"乘完再钳最低 1"：10 在两种实现下都得 10，
            // 只有 0 能把二者区分开。这条断言守住"默认倍率不改变任何既有伤害数值"。
            Assert.AreEqual(0, hb.ApplyDamageMultiplier(0), "倍率 1 时原样通过，不引入最低 1 的钳制");
        }
    }
}