using SepCore.Entity;
using UnityEngine;

namespace SepCore.Simulation
{
    public sealed partial class SimulationWorld
    {
        #region Simulation State Lifecycle

        public void ClearSimulationState()
        {
            _enemies.Clear();
            _projectiles.Clear();
            _pickups.Clear();
            _projectileRecycleEntityIds.Clear();
            _projectileResolvedEntityIds.Clear();
            _areaCollisionRequests.Clear();
            _areaCollisionHitEvents.Clear();
            _areaCollisionHitDedupKeys.Clear();
            _fixedStepAccumulator = 0d;
            ClearJobDataChannels();
            ClearPlayerMovementState();
        }

        #endregion

        #region Enemy Simulation State

        public int EnemyCount => _enemies.Count;

        public bool TryGetEnemySnapshot(int entityId, out EnemySimData snapshot)
        {
            if (!_enemies.TryGetSimulationIndex(entityId, out int index))
            {
                snapshot = default;
                return false;
            }

            EnemyTransformSim transform = _enemies.Transform[index];
            EnemyMoveInputSim moveInput = _enemies.MoveInput[index];
            EnemyMoveConfigSim moveConfig = _enemies.MoveConfig[index];
            EnemyAttackSim attack = _enemies.Attack[index];
            EnemyBehaviorSim behavior = _enemies.Behavior[index];
            snapshot = new EnemySimData
            {
                EntityId = entityId,
                Position = ToVector3(transform.Position),
                Forward = ToVector3(transform.Forward),
                Rotation = ToQuaternion(transform.Rotation),
                Speed = moveInput.Speed,
                AttackRange = attack.AttackRange,
                AvoidEnemyOverlap = moveConfig.AvoidOverlap,
                EnemyBodyRadius = moveConfig.BodyRadius,
                SeparationIterations = moveConfig.SeparationIterations,
                State = behavior.State
            };
            return true;
        }

        private int AddEnemy(in EnemySimData simData)
        {
            InitializeJobDataChannels();

            int index = _enemies.Add(
                new EnemyIdentitySim { EntityId = simData.EntityId },
                new EnemyTransformSim
                {
                    Position = ToFloat3(simData.Position),
                    Forward = ToFloat3(simData.Forward),
                    Rotation = ToQuaternion(simData.Rotation)
                },
                new EnemyMoveInputSim { Speed = simData.Speed },
                new EnemyMoveConfigSim
                {
                    AvoidOverlap = simData.AvoidEnemyOverlap,
                    BodyRadius = simData.EnemyBodyRadius,
                    SeparationIterations = simData.SeparationIterations
                },
                new EnemyAttackSim { AttackRange = simData.AttackRange },
                new EnemyBehaviorSim { State = simData.State });
            MarkEnemyTargetSpatialIndexDirty();
            return index;
        }

        internal int UpsertEnemy(in EnemySimData simData)
        {
            if (!_enemies.TryGetSimulationIndex(simData.EntityId, out int index))
            {
                return AddEnemy(in simData);
            }

            _enemies.Identity[index] = new EnemyIdentitySim { EntityId = simData.EntityId };
            _enemies.Transform[index] = new EnemyTransformSim
            {
                Position = ToFloat3(simData.Position),
                Forward = ToFloat3(simData.Forward),
                Rotation = ToQuaternion(simData.Rotation)
            };
            _enemies.MoveInput[index] = new EnemyMoveInputSim { Speed = simData.Speed };
            _enemies.MoveConfig[index] = new EnemyMoveConfigSim
            {
                AvoidOverlap = simData.AvoidEnemyOverlap,
                BodyRadius = simData.EnemyBodyRadius,
                SeparationIterations = simData.SeparationIterations
            };
            _enemies.Attack[index] = new EnemyAttackSim { AttackRange = simData.AttackRange };
            _enemies.Behavior[index] = new EnemyBehaviorSim { State = simData.State };
            MarkEnemyTargetSpatialIndexDirty();
            return index;
        }

        private bool RemoveEnemyByEntityId(int entityId)
        {
            if (!_enemies.RemoveByEntityId(entityId))
            {
                return false;
            }

            MarkEnemyTargetSpatialIndexDirty();
            return true;
        }

        private void RegisterEnemyLifecycle(EnemyBase enemy, object userData)
        {
            if (enemy == null || enemy.CachedTransform == null)
            {
                return;
            }

            EnemyData enemyData = userData as EnemyData;
            UpsertEnemy(CreateEnemyInitialSimData(enemy, enemyData));
        }

        private void UnregisterEnemyLifecycle(int entityId)
        {
            RemoveEnemyByEntityId(entityId);
        }

        public void SyncEnemyMovementInput(int entityId, bool isMoving, in Vector3 direction, float speed,
            bool avoidEnemyOverlap, float enemyBodyRadius, int separationIterations)
        {
            if (!_enemies.TryGetSimulationIndex(entityId, out int index))
            {
                return;
            }

            _enemies.MoveInput[index] = new EnemyMoveInputSim
            {
                Speed = isMoving ? Mathf.Max(0f, speed) : 0f
            };
            _enemies.MoveConfig[index] = new EnemyMoveConfigSim
            {
                AvoidOverlap = avoidEnemyOverlap,
                BodyRadius = Mathf.Max(0.01f, enemyBodyRadius),
                SeparationIterations = Mathf.Max(1, separationIterations)
            };

            Vector3 planarDirection = direction;
            planarDirection.y = 0f;
            if (planarDirection.sqrMagnitude > Mathf.Epsilon)
            {
                planarDirection.Normalize();
                EnemyTransformSim transform = _enemies.Transform[index];
                transform.Forward = ToFloat3(planarDirection);
                _enemies.Transform[index] = transform;
            }
        }

        #endregion

        #region Projectile Simulation State

        public int ProjectileCount => _projectiles.Count;

        public bool TryGetProjectileSnapshot(int entityId, out ProjectileSimData snapshot)
        {
            if (!_projectiles.TryGetSimulationIndex(entityId, out int index))
            {
                snapshot = default;
                return false;
            }

            ProjectileIdentitySim identity = _projectiles.Identity[index];
            ProjectileTransformSim transform = _projectiles.Transform[index];
            ProjectileVelocitySim velocity = _projectiles.Velocity[index];
            ProjectileLifeSim life = _projectiles.Life[index];
            snapshot = new ProjectileSimData
            {
                EntityId = identity.EntityId,
                OwnerEntityId = identity.OwnerEntityId,
                Position = ToVector3(transform.Position),
                Forward = ToVector3(transform.Forward),
                Velocity = ToVector3(velocity.Velocity),
                LifeTime = life.LifeTime,
                Age = life.Age,
                Active = life.Active
            };
            return true;
        }

        private int AddProjectile(in ProjectileSimData simData)
        {
            InitializeJobDataChannels();

            return _projectiles.Add(
                new ProjectileIdentitySim
                {
                    EntityId = simData.EntityId,
                    OwnerEntityId = simData.OwnerEntityId
                },
                new ProjectileTransformSim
                {
                    Position = ToFloat3(simData.Position),
                    Forward = ToFloat3(simData.Forward)
                },
                new ProjectileVelocitySim { Velocity = ToFloat3(simData.Velocity) },
                new ProjectileLifeSim
                {
                    Age = simData.Age,
                    LifeTime = simData.LifeTime,
                    Active = simData.Active
                });
        }

        internal int UpsertProjectile(in ProjectileSimData simData)
        {
            if (!_projectiles.TryGetSimulationIndex(simData.EntityId, out int index))
            {
                return AddProjectile(in simData);
            }

            _projectiles.Identity[index] = new ProjectileIdentitySim
            {
                EntityId = simData.EntityId,
                OwnerEntityId = simData.OwnerEntityId
            };
            _projectiles.Transform[index] = new ProjectileTransformSim
            {
                Position = ToFloat3(simData.Position),
                Forward = ToFloat3(simData.Forward)
            };
            _projectiles.Velocity[index] = new ProjectileVelocitySim { Velocity = ToFloat3(simData.Velocity) };
            _projectiles.Life[index] = new ProjectileLifeSim
            {
                Age = simData.Age,
                LifeTime = simData.LifeTime,
                Active = simData.Active
            };
            return index;
        }

        private bool RemoveProjectileByEntityId(int entityId)
        {
            return _projectiles.RemoveByEntityId(entityId);
        }

        private void RegisterProjectileLifecycle(EntityBase projectileEntity, object userData)
        {
            if (projectileEntity == null || projectileEntity.CachedTransform == null)
            {
                return;
            }

            UpsertProjectile(CreateProjectileInitialSimData(projectileEntity, userData));
        }

        private void UnregisterProjectileLifecycle(int entityId)
        {
            RemoveProjectileByEntityId(entityId);
        }

        #endregion

        #region Pickup Simulation State

        public int PickupCount => _pickups.Count;

        public bool TryGetPickupSnapshot(int entityId, out PickupSimData snapshot)
        {
            if (!_pickups.TryGetSimulationIndex(entityId, out int index))
            {
                snapshot = default;
                return false;
            }

            PickupTransformSim transform = _pickups.Transform[index];
            PickupRadiusSim radius = _pickups.Radius[index];
            PickupStateSim state = _pickups.State[index];
            snapshot = new PickupSimData
            {
                EntityId = entityId,
                Position = ToVector3(transform.Position),
                PickupRadius = radius.Radius,
                State = state.State
            };
            return true;
        }

        private int AddPickup(in PickupSimData simData)
        {
            InitializeJobDataChannels();

            return _pickups.Add(
                new PickupIdentitySim { EntityId = simData.EntityId },
                new PickupTransformSim { Position = ToFloat3(simData.Position) },
                new PickupRadiusSim { Radius = simData.PickupRadius },
                new PickupStateSim { State = simData.State });
        }

        internal int UpsertPickup(in PickupSimData simData)
        {
            if (!_pickups.TryGetSimulationIndex(simData.EntityId, out int index))
            {
                return AddPickup(in simData);
            }

            _pickups.Identity[index] = new PickupIdentitySim { EntityId = simData.EntityId };
            _pickups.Transform[index] = new PickupTransformSim { Position = ToFloat3(simData.Position) };
            _pickups.Radius[index] = new PickupRadiusSim { Radius = simData.PickupRadius };
            _pickups.State[index] = new PickupStateSim { State = simData.State };
            return index;
        }

        public void TriggerFullMapMagnet()
        {
            int pickupCount = _pickups.Count;
            for (int i = 0; i < pickupCount; i++)
            {
                _pickups.State[i] = new PickupStateSim { State = PickupStateSim.StateAbsorbing };
            }
        }

        private bool RemovePickupByEntityId(int entityId)
        {
            return _pickups.RemoveByEntityId(entityId);
        }

        private void RegisterPickupLifecycle(EntityBase pickupEntity)
        {
            if (pickupEntity == null || pickupEntity.CachedTransform == null)
            {
                return;
            }

            UpsertPickup(CreatePickupInitialSimData(pickupEntity));
        }

        private void UnregisterPickupLifecycle(int entityId)
        {
            RemovePickupByEntityId(entityId);
        }

        #endregion
    }
}