using System.Collections;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.TestTools;
using BaseGames.UI;

namespace BaseGames.Tests.PlayMode
{
    /// <summary>
    /// UITween 静态库测试：验证补间在终态吸附、零时长立即返回、null 安全。
    /// </summary>
    public class UITweenTests
    {
        private GameObject _go;

        [SetUp]    public void SetUp()    { _go = new GameObject("TweenHost", typeof(RectTransform), typeof(CanvasGroup)); }
        [TearDown] public void TearDown() { Object.DestroyImmediate(_go); }

        [UnityTest]
        public IEnumerator MoveAnchored_ReachesTarget()
        {
            var rect = _go.GetComponent<RectTransform>();
            rect.anchoredPosition = Vector2.zero;
            yield return _go.AddComponent<TestRunner>().Run(UITween.MoveAnchored(rect, new Vector2(100, 50), 0.05f));
            Assert.AreEqual(new Vector2(100, 50), rect.anchoredPosition);
        }

        [UnityTest]
        public IEnumerator FadeCanvasGroup_ReachesTarget()
        {
            var cg = _go.GetComponent<CanvasGroup>();
            cg.alpha = 0f;
            yield return _go.AddComponent<TestRunner>().Run(UITween.FadeCanvasGroup(cg, 1f, 0.05f));
            Assert.AreEqual(1f, cg.alpha, 0.001f);
        }

        [UnityTest]
        public IEnumerator ZeroDuration_SnapsImmediately()
        {
            var rect = _go.GetComponent<RectTransform>();
            yield return _go.AddComponent<TestRunner>().Run(UITween.MoveAnchored(rect, new Vector2(7, 7), 0f));
            Assert.AreEqual(new Vector2(7, 7), rect.anchoredPosition);
        }

        [UnityTest]
        public IEnumerator NullTarget_NoException()
        {
            yield return _go.AddComponent<TestRunner>().Run(UITween.MoveAnchored(null, Vector2.one, 0.05f));
            yield return _go.AddComponent<TestRunner>().Run(UITween.FadeCanvasGroup(null, 1f, 0.05f));
            Assert.Pass();
        }

        /// <summary>挂宿主跑协程的辅助 MonoBehaviour（测试场景无 EventSystem）。</summary>
        private class TestRunner : MonoBehaviour
        {
            public IEnumerator Run(IEnumerator inner) { yield return StartCoroutine(inner); }
        }
    }
}