using NUnit.Framework;
using BaseGames.Enemies;

namespace BaseGames.Tests.EditMode.Enemies
{
    /// <summary>
    /// StallDetector：窗口内净位移不足即判停滞。
    /// 该逻辑原本在 3 处各写一遍（巡逻 Pace / 导航层 / 冲锋），此处集中钉住行为。
    /// </summary>
    public class StallDetectorTests
    {
        const float Window = 0.5f, MinProgress = 0.05f;

        [Test]
        public void BeforeWindowElapses_NeverStalled()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsFalse(d.Tick(0f, 0.1f));   // 完全没动，但窗口未到
            Assert.IsFalse(d.Tick(0f, 0.1f));
        }

        [Test]
        public void NoProgressOverWindow_Stalled()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsFalse(d.Tick(0f, 0.4f));
            Assert.IsTrue (d.Tick(0f, 0.2f));   // 累计 0.6s ≥ 窗口，净位移 0
        }

        [Test]
        public void EnoughProgressOverWindow_NotStalled()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsFalse(d.Tick(1f, 0.6f));   // 位移 1m 远超阈值
        }

        [Test]
        public void ProgressJustBelowThreshold_Stalled()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsTrue(d.Tick(0.04f, 0.6f)); // 0.04 < 0.05
        }

        [Test]
        public void ProgressCountsBothDirections()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsFalse(d.Tick(-1f, 0.6f));  // 向左移动同样算推进
        }

        [Test]
        public void AfterStalled_WindowRestartsFromCurrentPosition()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            Assert.IsTrue (d.Tick(0f, 0.6f));   // 第一次判停滞
            Assert.IsFalse(d.Tick(0f, 0.1f));  // 窗口已重开，未到期
            Assert.IsTrue (d.Tick(0f, 0.6f));  // 再次到期且仍无推进
        }

        [Test]
        public void Reset_ClearsAccumulatedTime()
        {
            var d = new StallDetector(Window, MinProgress);
            d.Reset(0f);
            d.Tick(0f, 0.4f);
            d.Reset(0f);                        // 重开窗口
            Assert.IsFalse(d.Tick(0f, 0.2f));  // 只累计了 0.2s
        }

        [Test]
        public void WithoutReset_FirstTickInitializes()
        {
            var d = new StallDetector(Window, MinProgress);
            Assert.IsFalse(d.Tick(5f, 1f));     // 未 Reset 时首帧只做初始化，不误判
        }
    }
}