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

namespace ProjectM.Tests
{
    /// <summary>
    /// Pins the boon pool math (<see cref="BoonMath.PickBoons"/>: deterministic, 3 distinct, class-filtered,
    /// weight-0 excluded) and <see cref="BoonOfferSystem"/> (one deal per RoomEpoch; expedition players only;
    /// owner-seeded per player so co-op offers differ).
    /// </summary>
    public class BoonOfferTests
    {
        [Test]
        public void PickBoons_Deterministic_Distinct_ClassFiltered()
        {
            var blob = BoonCatalogData.BuildDefault(Allocator.Temp);
            ref var pool = ref blob.Value;

            for (byte classId = 0; classId <= 1; classId++)
            {
                for (uint seed = 1; seed < 200; seed += 7)
                {
                    int n = BoonMath.PickBoons(seed, classId, ref pool, out byte a0, out byte a1, out byte a2);
                    Assert.AreEqual(3, n, "the default pool always fills 3 options");
                    Assert.AreNotEqual(a0, a1, "distinct");
                    Assert.AreNotEqual(a1, a2, "distinct");
                    Assert.AreNotEqual(a0, a2, "distinct");

                    // Deterministic re-draw.
                    BoonMath.PickBoons(seed, classId, ref pool, out byte b0, out byte b1, out byte b2);
                    Assert.AreEqual(a0, b0);
                    Assert.AreEqual(a1, b1);
                    Assert.AreEqual(a2, b2);

                    // Every option is class-legal.
                    byte bit = BoonMath.MaskFor(classId);
                    foreach (var id in new[] { a0, a1, a2 })
                    {
                        int idx = BoonMath.FindDef(ref pool, id);
                        Assert.GreaterOrEqual(idx, 0, "offered id exists");
                        Assert.AreNotEqual(0, pool.Defs[idx].ClassMask & bit,
                            $"boon {id} offered to class {classId} must pass its ClassMask");
                    }
                }
            }
            blob.Dispose();
        }

        [Test]
        public void OfferSystem_DealsOncePerRoom_ExpeditionOnly_PerPlayerSeeds()
        {
            var world = new World("BoonOfferTest");
            var group = world.GetOrCreateSystemManaged<SimulationSystemGroup>();
            group.AddSystemToUpdateList(world.GetOrCreateSystem<BoonOfferSystem>());
            group.SortSystems();
            world.SetTime(new TimeData(elapsedTime: 0f, deltaTime: 1f / 60f));
            var em = world.EntityManager;

            var dir = em.CreateEntity(typeof(RunInfo), typeof(RunRuntime));
            em.SetComponentData(dir, new RunInfo { Lifecycle = RunLifecycle.RoomReward, CurrentRoom = 1 });
            em.SetComponentData(dir, new RunRuntime { RunSeed = 4242u, RoomEpoch = 2 });

            var catalog = em.CreateEntity(typeof(BoonCatalog));
            em.SetComponentData(catalog, new BoonCatalog { Value = BoonCatalogData.BuildDefault() });

            Entity MakePlayer(int netId, byte region, byte classId)
            {
                var e = em.CreateEntity(typeof(PlayerTag), typeof(BoonOffer), typeof(GhostOwner),
                    typeof(RegionTag), typeof(PlayerClass));
                em.SetComponentData(e, new GhostOwner { NetworkId = netId });
                em.SetComponentData(e, new RegionTag { Region = region });
                em.SetComponentData(e, new PlayerClass { ClassId = classId });
                return e;
            }
            var out1 = MakePlayer(1, RegionId.Expedition, 0);
            var out2 = MakePlayer(2, RegionId.Expedition, 1);
            var home = MakePlayer(3, RegionId.Base, 0);

            group.Update(); // one-shot state attach
            group.Update(); // deal

            var offer1 = em.GetComponentData<BoonOffer>(out1);
            var offer2 = em.GetComponentData<BoonOffer>(out2);
            Assert.AreEqual(1, offer1.Pending, "expedition player 1 dealt");
            Assert.AreEqual(1, offer2.Pending, "expedition player 2 dealt");
            Assert.AreEqual(0, em.GetComponentData<BoonOffer>(home).Pending, "home player dealt NOTHING");
            bool differ = offer1.Option0 != offer2.Option0 || offer1.Option1 != offer2.Option1
                || offer1.Option2 != offer2.Option2;
            Assert.IsTrue(differ, "per-player seeds -> co-op offers differ (seed folds NetworkId)");

            // Same epoch -> no re-deal (clear one offer and confirm it stays cleared).
            em.SetComponentData(out1, default(BoonOffer));
            group.Update();
            Assert.AreEqual(0, em.GetComponentData<BoonOffer>(out1).Pending, "one deal per RoomEpoch (latch)");

            world.Dispose();
        }
    }
}