using NUnit.Framework;
using ProjectM.Server;
using ProjectM.Simulation;
using Unity.Collections;
using Unity.Core;
using Unity.Entities;
using Unity.Mathematics;
using Unity.NetCode;
using Unity.Transforms;

namespace ProjectM.Tests
{
    /// <summary>
    /// Plain-Entities EditMode tests for <see cref="RoomEnemyDirectorSystem"/> (the Step-6 successor of the retired
    /// ZoneEnemyDirectorSystem). Pins: the per-RoomEpoch reseed sized by ZoneEnemyMath on the room's DifficultyEpoch;
    /// spawns at the ACTIVE sub-slot origin carrying the full tag stack (RegionTag{Expedition} + ZoneEnemyTag +
    /// RoomTag) with baked Scale preserved; the Boss room's single scaled boss; the MaxAlive pack-fit wait; and the
    /// ExpeditionObjective Cleared/Idle latch written above the early-returns.
    /// </summary>
    public class RoomEnemyDirectorSystemTests
    {
        const uint Seed = 777u;
        const uint T0 = 500;

        static (World world, SimulationSystemGroup group, Entity runDir, Entity zoneDir) MakeWorld(
            int currentRoom, int currentNodeId, byte activeSubSlot, int maxAlive = 10)
        {
            var world = new World("RoomEnemyTest");
            var group = world.GetOrCreateSystemManaged<SimulationSystemGroup>();
            group.AddSystemToUpdateList(world.GetOrCreateSystem<RoomEnemyDirectorSystem>());
            group.SortSystems();
            world.SetTime(new TimeData(elapsedTime: 0f, deltaTime: 1f / 60f));
            var em = world.EntityManager;

            var nt = em.CreateEntity(typeof(NetworkTime));
            em.SetComponentData(nt, new NetworkTime { ServerTick = new NetworkTick(T0) });

            var map = RunMapMath.Generate(Seed);
            var runDir = em.CreateEntity(typeof(RunInfo), typeof(RunRuntime), typeof(ExpeditionObjective));
            em.SetComponentData(runDir, new RunInfo
            {
                Lifecycle = RunLifecycle.InRoom,
                CurrentRoom = currentRoom,
                RoomCount = map.LayerCount,
            });
            em.SetComponentData(runDir, new RunRuntime
            {
                RunSeed = Seed,
                RoomEpoch = 1,
                CurrentNodeId = currentNodeId,
                ActiveSubSlot = activeSubSlot,
            });

            var grunt = MakeEnemyPrefab(em);
            var charger = MakeEnemyPrefab(em);
            var zoneDir = em.CreateEntity(typeof(ZoneEnemyDirector), typeof(ZoneEnemyState));
            em.SetComponentData(zoneDir, new ZoneEnemyDirector
            {
                MaxAlive = maxAlive, RingRadius = 14f, RingSlots = 10, SpawnIntervalTicks = 10,
                GruntsPerWave = 4, ChargersPerWave = 1, SwarmerPackSize = 3, ClusterTightRadius = 1.5f, RewardOre = 25,
            });
            var buf = em.AddBuffer<ZoneEnemyPrefab>(zoneDir);
            buf.Add(new ZoneEnemyPrefab { Prefab = grunt });
            buf.Add(new ZoneEnemyPrefab { Prefab = charger });
            return (world, group, runDir, zoneDir);
        }

        static Entity MakeEnemyPrefab(EntityManager em)
        {
            var e = em.CreateEntity(typeof(LocalTransform), typeof(EnemyTag), typeof(Health));
            em.SetComponentData(e, LocalTransform.Identity); // Scale = 1 so WithPosition keeps it
            em.SetComponentData(e, new Health { Current = 50f, Max = 50f });
            em.AddComponent<Prefab>(e);
            return e;
        }

        static MixBands Bands() => new MixBands { GruntBase = 4, ChargerBase = 1 };

        static int Alive(EntityManager em)
        {
            using var q = em.CreateEntityQuery(typeof(ZoneEnemyTag));
            return q.CalculateEntityCount();
        }

        static void AdvanceTick(EntityManager em, uint tick)
        {
            using var q = em.CreateEntityQuery(typeof(NetworkTime));
            em.SetComponentData(q.GetSingletonEntity(), new NetworkTime { ServerTick = new NetworkTick(tick) });
        }

        [Test]
        public void Seeds_ByRoomDifficulty_AndSpawnsTaggedAtActiveSlotOrigin()
        {
            var (world, group, runDir, zoneDir) = MakeWorld(currentRoom: 0, currentNodeId: RunMap.NodeId(0, 0), activeSubSlot: 0);
            using (world)
            {
            var em = world.EntityManager;
            var map = RunMapMath.Generate(Seed);
            var plan = RoomLayoutMath.Plan(map.NodeAt(RunMap.NodeId(0, 0)), 0, map.LayerCount);
            int slots = ZoneEnemyMath.WaveSlots(plan.DifficultyEpoch, Bands());

            group.Update(); // seeds; the landing grace holds the first slot (demo polish)
            Assert.AreEqual(slots, em.GetComponentData<ZoneEnemyState>(zoneDir).RemainingToSpawn,
                "grace: nothing spawns on the seed tick");
            AdvanceTick(em, T0 + Tuning.RoomEntryGraceTicks + 1);
            group.Update(); // grace elapsed -> the first slot drips

            var zs = em.GetComponentData<ZoneEnemyState>(zoneDir);
            Assert.AreEqual(1, zs.SeededEpoch, "seeded for RoomEpoch 1");
            Assert.AreEqual(slots - 1, zs.RemainingToSpawn, "wave sized by ZoneEnemyMath on the room's DifficultyEpoch");
            Assert.AreEqual(1, Alive(em), "first slot drip-spawned");

            var q = em.CreateEntityQuery(typeof(ZoneEnemyTag), typeof(RoomTag), typeof(RegionTag), typeof(LocalTransform));
            Assert.AreEqual(1, q.CalculateEntityCount(), "spawn carries the FULL tag stack (Zone + Room + Region)");
            var xfs = q.ToComponentDataArray<LocalTransform>(Allocator.Temp);
            var regs = q.ToComponentDataArray<RegionTag>(Allocator.Temp);
            var rooms = q.ToComponentDataArray<RoomTag>(Allocator.Temp);
            Assert.AreEqual(RegionId.Expedition, regs[0].Region);
            Assert.AreEqual(0, rooms[0].Room);
            Assert.AreEqual(1f, xfs[0].Scale, 1e-4f, "baked Scale preserved");
            float3 origin = RegionMath.ExpeditionRoomOrigin(new float3(0f, 1f, 0f), 0);
            Assert.LessOrEqual(math.distance(xfs[0].Position.xz, origin.xz), 14f + 0.01f,
                "ring-spawned around the ACTIVE sub-slot origin");
            xfs.Dispose(); regs.Dispose(); rooms.Dispose(); q.Dispose(); // dispose BEFORE the worldispose();
            }
        }

        [Test]
        public void BossRoom_SpawnsSingleScaledBoss()
        {
            var map = RunMapMath.Generate(Seed);
            int bossLayer = map.LayerCount - 1;
            var (world, group, runDir, zoneDir) = MakeWorld(bossLayer, map.BossNodeId, activeSubSlot: (byte)(bossLayer & 1));
            using (world)
            {
            var em = world.EntityManager;

            group.Update(); // seed tick (the landing grace holds the boss)
            AdvanceTick(em, T0 + Tuning.RoomEntryGraceTicks + 1);
            group.Update(); // grace elapsed -> the boss spawns

            var zs = em.GetComponentData<ZoneEnemyState>(zoneDir);
            Assert.AreEqual(0, zs.RemainingToSpawn, "a boss room is a single-slot wave, fully spawned");
            Assert.AreEqual(1, Alive(em), "exactly one boss");

            var q = em.CreateEntityQuery(typeof(ZoneEnemyTag), typeof(Health), typeof(LocalTransform));
            var hps = q.ToComponentDataArray<Health>(Allocator.Temp);
            var xfs = q.ToComponentDataArray<LocalTransform>(Allocator.Temp);
            Assert.AreEqual(50f * Tuning.BossHealthMultiplier, hps[0].Max, 1e-3f, "boss health scaled");
            Assert.AreEqual(Tuning.BossScaleMultiplier, xfs[0].Scale, 1e-3f, "boss visual scale bumped");
            hps.Dispose(); xfs.Dispose(); q.Dispose(); // dispose BEFORE the world (a using-var here outlives it);
            }
        }

        [Test]
        public void Objective_ClearedLatch_AndIdleOutsideRooms()
        {
            var (world, group, runDir, zoneDir) = MakeWorld(0, RunMap.NodeId(0, 0), 0);
            using (world)
            {
            var em = world.EntityManager;

            // Fabricate a fully-spawned, fully-dead wave for the CURRENT room epoch.
            em.SetComponentData(zoneDir, new ZoneEnemyState { SeededEpoch = 1, RemainingToSpawn = 0, SpawnCounter = 5 });
            group.Update();
            Assert.AreEqual(ExpeditionObjectiveState.Cleared, em.GetComponentData<ExpeditionObjective>(runDir).State,
                "fully-spawned + zero-alive latches Cleared for the seeded epoch");

            var info = em.GetComponentData<RunInfo>(runDir);
            info.Lifecycle = RunLifecycle.Staging;
            em.SetComponentData(runDir, info);
            group.Update();
            Assert.AreEqual(ExpeditionObjectiveState.Idle, em.GetComponentData<ExpeditionObjective>(runDir).State,
                "no active room -> Idle (objective still written above the early-return)");
            }
        }

        [Test]
        public void MaxAlive_PackFitWaits_WithoutConsumingTheSlot()
        {
            var (world, group, runDir, zoneDir) = MakeWorld(0, RunMap.NodeId(0, 0), 0, maxAlive: 1);
            using (world)
            {
            var em = world.EntityManager;
            // One zone enemy already alive fills the cap.
            var blocker = em.CreateEntity(typeof(ZoneEnemyTag));
            // Pre-seed so the tick goes straight to the drip branch.
            em.SetComponentData(zoneDir, new ZoneEnemyState { SeededEpoch = 1, RemainingToSpawn = 2, NextSpawnTick = 0 });

            group.Update();

            var zs = em.GetComponentData<ZoneEnemyState>(zoneDir);
            Assert.AreEqual(1, Alive(em), "cap full -> nothing spawned");
            Assert.AreEqual(2, zs.RemainingToSpawn, "the slot WAITS (not consumed) until the pack fits");
            }
        }
    }
}