using NUnit.Framework;
using ProjectM.Simulation;

namespace ProjectM.Tests
{
    /// <summary>
    /// Pure-function tests for <see cref="RespawnMath"/> (no ECS world), mirroring PlayerSpawnRingTests /
    /// EnemyAIMathTests. Pins the deterministic player respawn-timer math.
    /// </summary>
    public class RespawnMathTests
    {
        [Test]
        public void RespawnTick_AddsDelay()
        {
            Assert.AreEqual(1180u, RespawnMath.RespawnTick(1000u, 180));
        }

        [Test]
        public void RespawnTick_ClampsDelayToAtLeastOne()
        {
            Assert.AreEqual(1001u, RespawnMath.RespawnTick(1000u, 0));
            Assert.AreEqual(1001u, RespawnMath.RespawnTick(1000u, -5));
        }

        [Test]
        public void RespawnTick_NeverReturnsZeroSentinel()
        {
            // A death exactly at tick 0 must still schedule a non-zero recovery tick.
            Assert.AreNotEqual(0u, RespawnMath.RespawnTick(0u, 1));
        }

        [Test]
        public void IsDue_FalseBefore_TrueAtOrAfter()
        {
            Assert.IsFalse(RespawnMath.IsDue(1100u, 1180u));
            Assert.IsTrue(RespawnMath.IsDue(1180u, 1180u));
            Assert.IsTrue(RespawnMath.IsDue(1200u, 1180u));
        }

        [Test]
        public void IsDue_FalseWhenNoneScheduled()
        {
            Assert.IsFalse(RespawnMath.IsDue(99999u, 0u));
        }
    }
}