using Unity.Netcode;
using UnityEngine;
using UnityEngine.AI;

namespace Northbound
{
    [RequireComponent(typeof(Animator))]
    [RequireComponent(typeof(EnemyAIController))]
    public class MonsterAnimationController : NetworkBehaviour
    {
        [Header("Animation Parameters")]
        [Tooltip("Speed parameter name in Animator")]
        public string speedParam = "Speed";

        [Tooltip("Attack trigger parameter name in Animator")]
        public string attackTriggerParam = "Attack";

        [Tooltip("IsMoving bool parameter name in Animator")]
        public string isMovingParam = "IsMoving";

        [Tooltip("Death trigger parameter name in Animator")]
        public string dieTriggerParam = "Die";

        [Header("Settings")]
        [Tooltip("Auto-load animator controller from MonsterData")]
        public bool autoLoadFromMonsterData = true;

        [Tooltip("Debug logging")]
        public bool debugLogging = false;

        private Animator _animator;
        private EnemyAIController _aiController;
        private EnemyUnit _enemyUnit;
        private NavMeshAgent _agent;

        private NetworkVariable<float> _networkSpeed = new NetworkVariable<float>(
            0f,
            NetworkVariableReadPermission.Everyone,
            NetworkVariableWritePermission.Owner
        );

        private NetworkVariable<bool> _networkIsMoving = new NetworkVariable<bool>(
            false,
            NetworkVariableReadPermission.Everyone,
            NetworkVariableWritePermission.Owner
        );

        public override void OnNetworkSpawn()
        {
            base.OnNetworkSpawn();

            _animator = GetComponent<Animator>();
            _aiController = GetComponent<EnemyAIController>();
            _enemyUnit = GetComponent<EnemyUnit>();
            _agent = GetComponent<NavMeshAgent>();

            _aiController.OnAttackPerformed += HandleAttackPerformed;
            if (_enemyUnit != null)
            {
                _enemyUnit.OnDeath += HandleDeath;
            }

            if (autoLoadFromMonsterData)
            {
                LoadAnimatorController();
            }
        }

        public override void OnNetworkDespawn()
        {
            if (_aiController != null)
            {
                _aiController.OnAttackPerformed -= HandleAttackPerformed;
            }
            if (_enemyUnit != null)
            {
                _enemyUnit.OnDeath -= HandleDeath;
            }
            base.OnNetworkDespawn();
        }

        private void HandleAttackPerformed(GameObject target)
        {
            if (!IsServer) return;
            TriggerAttackClientRpc();
            if (debugLogging)
                Debug.Log($"[MonsterAnimationController] Triggered attack animation for {target.name}", this);
        }

        private void HandleDeath(ulong killerId)
        {
            if (!IsServer) return;
            TriggerDeathClientRpc();
            if (debugLogging)
                Debug.Log($"[MonsterAnimationController] Triggered death animation (killer: {killerId})", this);
        }

        private void LoadAnimatorController()
        {
            var monsterDataComponent = GetComponent<MonsterDataComponent>();
            if (monsterDataComponent != null && monsterDataComponent.monsterData != null)
            {
                string animatorPath = monsterDataComponent.monsterData.animationControllerPath;
                if (!string.IsNullOrEmpty(animatorPath))
                {
                    RuntimeAnimatorController controller = Resources.Load<RuntimeAnimatorController>(animatorPath);
                    if (controller != null)
                    {
                        _animator.runtimeAnimatorController = controller;
                        if (debugLogging)
                            Debug.Log($"[MonsterAnimationController] Loaded animator from {animatorPath}", this);
                    }
                    else if (debugLogging)
                    {
                        Debug.LogWarning($"[MonsterAnimationController] Could not load animator from {animatorPath}", this);
                    }
                }
            }
        }

        private void Update()
        {
            if (!IsSpawned) return;

            if (IsServer && IsOwner)
            {
                UpdateServerSide();
            }

            UpdateClientSide();
        }

        private void UpdateServerSide()
        {
            // 사망 상태면 이동 애니메이션 중지
            if (_aiController != null && _aiController.GetCurrentState() == EnemyAIState.Dead)
            {
                _networkSpeed.Value = 0f;
                _networkIsMoving.Value = false;
                return;
            }

            if (_agent == null) return;

            float currentSpeed = _agent.velocity.magnitude;
            bool isMoving = currentSpeed > 0.1f && _agent.isOnNavMesh && !_agent.isStopped;

            _networkSpeed.Value = currentSpeed;
            _networkIsMoving.Value = isMoving;
        }

        private void UpdateClientSide()
        {
            if (_animator == null) return;

            _animator.SetFloat(speedParam, _networkSpeed.Value);
            _animator.SetBool(isMovingParam, _networkIsMoving.Value);
        }

        [Rpc(SendTo.ClientsAndHost)]
        private void TriggerAttackClientRpc()
        {
            if (_animator != null)
            {
                _animator.SetTrigger(attackTriggerParam);
            }
        }

        [Rpc(SendTo.ClientsAndHost)]
        private void TriggerDeathClientRpc()
        {
            if (_animator != null)
            {
                _animator.SetTrigger(dieTriggerParam);
            }
        }

        public void ResetAttackTrigger()
        {
            if (_animator != null)
            {
                _animator.ResetTrigger(attackTriggerParam);
            }
        }
    }
}