using System;
using UnityEngine;
using Unity.Netcode;
using Colosseum.Stats;
using Colosseum.Combat;

namespace Colosseum.Player
{
    /// <summary>
    /// 플레이어 네트워크 상태 관리 (HP, MP 등)
    /// </summary>
    public class PlayerNetworkController : NetworkBehaviour, IDamageable
    {
        [Header("References")]
        [Tooltip("CharacterStats 컴포넌트 (없으면 자동 검색)")]
        [SerializeField] private CharacterStats characterStats;

        // 네트워크 동기화 변수
        private NetworkVariable<float> currentHealth = new NetworkVariable<float>(100f);
        private NetworkVariable<float> currentMana = new NetworkVariable<float>(50f);

        public float Health => currentHealth.Value;
        public float Mana => currentMana.Value;
        public float MaxHealth => characterStats != null ? characterStats.MaxHealth : 100f;
        public float MaxMana => characterStats != null ? characterStats.MaxMana : 50f;
        public CharacterStats Stats => characterStats;

        // 체력/마나 변경 이벤트
        public event Action<float, float> OnHealthChanged; // (oldValue, newValue)
        public event Action<float, float> OnManaChanged; // (oldValue, newValue)

        // IDamageable 구현
        public float CurrentHealth => currentHealth.Value;
        public bool IsDead => currentHealth.Value <= 0f;

        public override void OnNetworkSpawn()
        {
            // CharacterStats 참조 확인
            if (characterStats == null)
            {
                characterStats = GetComponent<CharacterStats>();
            }

            // 네트워크 변수 변경 콜백 등록
            currentHealth.OnValueChanged += HandleHealthChanged;
            currentMana.OnValueChanged += HandleManaChanged;

            // 초기화
            if (IsServer)
            {
                currentHealth.Value = MaxHealth;
                currentMana.Value = MaxMana;
            }
        }

        public override void OnNetworkDespawn()
        {
            // 콜백 해제
            currentHealth.OnValueChanged -= HandleHealthChanged;
            currentMana.OnValueChanged -= HandleManaChanged;
        }

        private void HandleHealthChanged(float oldValue, float newValue)
        {
            OnHealthChanged?.Invoke(oldValue, newValue);
        }

        private void HandleManaChanged(float oldValue, float newValue)
        {
            OnManaChanged?.Invoke(oldValue, newValue);
        }

        /// <summary>
        /// 대미지 적용 (서버에서만 실행)
        /// </summary>
        [Rpc(SendTo.Server)]
        public void TakeDamageRpc(float damage)
        {
            currentHealth.Value = Mathf.Max(0f, currentHealth.Value - damage);

            if (currentHealth.Value <= 0f)
            {
                HandleDeath();
            }
        }

        /// <summary>
        /// 마나 소모 (서버에서만 실행)
        /// </summary>
        [Rpc(SendTo.Server)]
        public void UseManaRpc(float amount)
        {
            currentMana.Value = Mathf.Max(0f, currentMana.Value - amount);
        }

        /// <summary>
        /// 체력 회복 (서버에서만 실행)
        /// </summary>
        [Rpc(SendTo.Server)]
        public void RestoreHealthRpc(float amount)
        {
            currentHealth.Value = Mathf.Min(MaxHealth, currentHealth.Value + amount);
        }

        /// <summary>
        /// 마나 회복 (서버에서만 실행)
        /// </summary>
        [Rpc(SendTo.Server)]
        public void RestoreManaRpc(float amount)
        {
            currentMana.Value = Mathf.Min(MaxMana, currentMana.Value + amount);
        }

        private void HandleDeath()
        {
            // TODO: 사망 처리 로직
            Debug.Log($"Player {OwnerClientId} died!");
        }

        #region IDamageable
        /// <summary>
        /// 대미지 적용 (서버에서만 호출)
        /// </summary>
        public float TakeDamage(float damage, object source = null)
        {
            if (!IsServer) return 0f;

            float actualDamage = Mathf.Min(damage, currentHealth.Value);
            currentHealth.Value = Mathf.Max(0f, currentHealth.Value - damage);

            if (currentHealth.Value <= 0f)
            {
                HandleDeath();
            }

            return actualDamage;
        }

        /// <summary>
        /// 체력 회복 (서버에서만 호출)
        /// </summary>
        public float Heal(float amount)
        {
            if (!IsServer) return 0f;

            float actualHeal = Mathf.Min(amount, MaxHealth - currentHealth.Value);
            currentHealth.Value = Mathf.Min(MaxHealth, currentHealth.Value + amount);

            return actualHeal;
        }
        #endregion
    }
}