using System.Collections;
using System.Reflection;
using BumpCombat.Combat;
using BumpCombat.Constants;
using BumpCombat.Defense.Comparison;
using BumpCombat.Enemies;
using BumpCombat.Player;
using BumpCombat.Progression;
using NUnit.Framework;
using UnityEditor;
using UnityEngine;
using UnityEngine.TestTools;
using Object = UnityEngine.Object;

namespace BumpCombat.Tests
{
    public sealed class Defense25DRelicReplayPlayModeTests
    {
        private const string SettingsPath = "Assets/_Project/Constants/Defense25DComparison/ComparisonSettings.asset";
        private GameplayConstants originalConstants;
        private GameplayConstants testConstants;
        private PassiveRelicConstants testRelicTuning;
        private Defense25DComparisonSettings settings;
        private Defense25DComparison world;
        private Defense25DEnemy enemy;
        private ActiveArtifactDefinition phoenix;
        private int ordinaryHits;
        private int replayHits;
        private int ordinaryHitFrame = -1;
        private int replayHitFrame = -1;
        private float previousTimeScale;

        [UnitySetUp]
        public IEnumerator SetUp()
        {
            previousTimeScale = Time.timeScale;
            Time.timeScale = 1f;
            ordinaryHits = replayHits = 0;
            ordinaryHitFrame = replayHitFrame = -1;
            originalConstants = GameplayConstants.Current;
            testConstants = Object.Instantiate(originalConstants);
            testRelicTuning = Object.Instantiate(originalConstants.PassiveRelics);
            testRelicTuning.ResonanceEchoChance = 1f;
            testRelicTuning.ResonantCrystalChance = 1f;
            testRelicTuning.ResonantCrystalDelaySeconds = .1f;
            typeof(GameplayConstants).GetField("passiveRelics", BindingFlags.Instance | BindingFlags.NonPublic)
                .SetValue(testConstants, testRelicTuning);
            GameplayConstants.SetCurrentForTests(testConstants);

            settings = Object.Instantiate(AssetDatabase.LoadAssetAtPath<Defense25DComparisonSettings>(SettingsPath));
            Assert.That(settings, Is.Not.Null);
            world = new GameObject("Relic replay integration world").AddComponent<Defense25DComparison>();
            world.Initialize(settings);
            world.AutoSpawn = false;
            world.ReadInput = false;
            world.Player.ResetAt(Vector2.zero);
            phoenix = world.Loadout.FindArtifact(ActiveArtifactEffect.Phoenix);
            Assert.That(world.Loadout.TryAddArtifact(phoenix), Is.True);
            testRelicTuning.ResonantCrystalDelaySeconds = .5f;
            enemy = world.Enemies[0];
            enemy.Actor.SetEnemyMaximumHealth(1000f);
            enemy.Spawn(Vector2.right * .45f);
            Physics.SyncTransforms();
            CombatEvents.OnValidHit += OnValidHit;
            yield return new WaitForFixedUpdate();
        }

        [UnityTearDown]
        public IEnumerator TearDown()
        {
            CombatEvents.OnValidHit -= OnValidHit;
            if (world != null) Object.Destroy(world.gameObject);
            if (settings != null) Object.Destroy(settings);
            if (testRelicTuning != null) Object.Destroy(testRelicTuning);
            if (testConstants != null) Object.Destroy(testConstants);
            GameplayConstants.SetCurrentForTests(originalConstants);
            Time.timeScale = previousTimeScale;
            yield return null;
        }

        [UnityTest]
        public IEnumerator ResonanceCoreReplaysImmediatelyWithoutExtraGaugeOrRelicRecursion()
        {
            Assert.That(world.Loadout.TryAcquireRelic(PassiveRelicId.ResonanceCore), Is.True);
            world.Loadout.AddGauge(phoenix.NormalGaugeCost);
            Assert.That(world.Loadout.Gauge, Is.GreaterThanOrEqualTo(phoenix.NormalGaugeCost));
            float initialHealth = enemy.Actor.CurrentHealth;
            float initialGauge = world.Loadout.Gauge;

            Assert.That(world.Loadout.TryUse(false), Is.True);
            Assert.That(ordinaryHits, Is.EqualTo(1));
            Assert.That(replayHits, Is.EqualTo(1));
            Assert.That(replayHitFrame, Is.EqualTo(ordinaryHitFrame),
                "Echo damage must be applied synchronously in the original hit's frame.");
            Assert.That(world.ArtifactExecutor.IsExecutingArtifact, Is.False);

            float expectedDamage = DamageCalculator.FinalizeDamage(
                    world.Player.CalculateDamage(phoenix.NormalDamage, phoenix.DamageTag))
                + DamageCalculator.FinalizeDamage(world.Player.CalculateDamage(
                    phoenix.NormalDamage * testRelicTuning.ResonanceEchoDamageMultiplier, phoenix.DamageTag));
            Assert.That(initialHealth - enemy.Actor.CurrentHealth,
                Is.EqualTo(expectedDamage).Within(.02f));
            Assert.That(ordinaryHits, Is.EqualTo(1));
            Assert.That(replayHits, Is.EqualTo(1));
            Assert.That(world.Loadout.Gauge,
                Is.EqualTo(initialGauge - phoenix.NormalGaugeCost).Within(.001f));

            yield return null;
        }

        [UnityTest]
        public IEnumerator ResonantCrystalReplaysImmediatelyWhenDelayExpiresWithoutExtraGaugeOrAnotherPendingRepeat()
        {
            Assert.That(world.Loadout.TryAcquireRelic(PassiveRelicId.ResonantCrystal), Is.True);
            world.Loadout.AddGauge(phoenix.NormalGaugeCost);
            Assert.That(world.Loadout.Gauge, Is.GreaterThanOrEqualTo(phoenix.NormalGaugeCost));
            float initialHealth = enemy.Actor.CurrentHealth;
            float initialGauge = world.Loadout.Gauge;

            Assert.That(world.Loadout.TryUse(false), Is.True);
            Assert.That(world.RelicRuntime.IsRepeatPending, Is.True);
            Assert.That(ordinaryHits, Is.EqualTo(1));
            Assert.That(replayHits, Is.Zero);
            Assert.That(world.Loadout.Gauge,
                Is.EqualTo(initialGauge - phoenix.NormalGaugeCost).Within(.001f));

            float timeout = Time.realtimeSinceStartup + 2f;
            while (world.RelicRuntime.IsRepeatPending && Time.realtimeSinceStartup < timeout)
            {
                yield return new WaitForFixedUpdate();
                Assert.That(world.Player.IsAlive, Is.True, "The player must remain alive throughout the repeat delay.");
                Assert.That(enemy.Actor.IsAlive, Is.True, "The target must survive the initial Phoenix hit and ignite ticks.");
                Assert.That(Vector2.Distance(world.Player.Position, enemy.Actor.Position),
                    Is.LessThanOrEqualTo(phoenix.NormalRange), "The target must stay within the replay ray during its delay.");
            }

            float expectedDamage = DamageCalculator.FinalizeDamage(
                    world.Player.CalculateDamage(phoenix.NormalDamage, phoenix.DamageTag))
                + DamageCalculator.FinalizeDamage(world.Player.CalculateDamage(
                    phoenix.NormalDamage * testRelicTuning.ResonantCrystalDamageFraction, phoenix.DamageTag));
            Assert.That(world.RelicRuntime.IsRepeatPending, Is.False);
            Assert.That(replayHits, Is.EqualTo(1));
            Assert.That(replayHitFrame, Is.GreaterThan(ordinaryHitFrame));
            Assert.That(replayHitFrame, Is.EqualTo(Time.frameCount),
                "Repeat damage must land in the frame the relic delay expires, not in a later cast step.");
            Assert.That(world.ArtifactExecutor.IsExecutingArtifact, Is.False);
            Assert.That(initialHealth - enemy.Actor.CurrentHealth,
                Is.EqualTo(expectedDamage).Within(.02f));
            Assert.That(ordinaryHits, Is.EqualTo(1));
            Assert.That(replayHits, Is.EqualTo(1));
            Assert.That(world.Loadout.Gauge,
                Is.EqualTo(initialGauge - phoenix.NormalGaugeCost).Within(.001f));

            yield return null;
        }

        private void OnValidHit(CombatHitResult hit)
        {
            if (hit.Target != enemy?.gameObject || !hit.IsArtifactHit) return;
            if (hit.SourceId == Defense25DRelicRuntime.EchoSourceId)
            {
                replayHits++;
                replayHitFrame = Time.frameCount;
            }
            else if (hit.SourceId == phoenix?.ArtifactId)
            {
                ordinaryHits++;
                ordinaryHitFrame = Time.frameCount;
            }
        }
    }
}