using UnityEngine;
using UnityEngine.InputSystem;
using Unity.Netcode;

using Colosseum.Skills;
using Colosseum.Weapons;

namespace Colosseum.Player
{
    /// <summary>
    /// 플레이어 스킬 입력 처리.
    /// 논타겟 방식: 입력 시 즉시 스킬 시전
    /// </summary>
    [RequireComponent(typeof(PlayerActionState))]
    public class PlayerSkillInput : NetworkBehaviour
    {
        [Header("Skill Slots")]
        [Tooltip("각 슬롯에 등록할 스킬 데이터 (6개 + 추가 슬롯)")]
        [SerializeField] private SkillData[] skillSlots = new SkillData[7];

        [Header("References")]
        [Tooltip("SkillController (없으면 자동 검색)")]
        [SerializeField] private SkillController skillController;
        [Tooltip("PlayerNetworkController (없으면 자동 검색)")]
        [SerializeField] private PlayerNetworkController networkController;
        [Tooltip("WeaponEquipment (없으면 자동 검색)")]
        [SerializeField] private WeaponEquipment weaponEquipment;
        [Tooltip("행동 상태 관리자 (없으면 자동 검색)")]
        [SerializeField] private PlayerActionState actionState;

        private InputSystem_Actions inputActions;

        public SkillData[] SkillSlots => skillSlots;

        public override void OnNetworkSpawn()
        {
            if (!IsOwner)
            {
                enabled = false;
                return;
            }

            // SkillController 참조 확인
            if (skillController == null)
            {
                skillController = GetComponent<SkillController>();
                if (skillController == null)
                {
                    Debug.LogError("PlayerSkillInput: SkillController not found!");
                    enabled = false;
                    return;
                }
            }

            // PlayerNetworkController 참조 확인
            if (networkController == null)
            {
                networkController = GetComponent<PlayerNetworkController>();
            }

            // WeaponEquipment 참조 확인
            if (weaponEquipment == null)
            {
                weaponEquipment = GetComponent<WeaponEquipment>();
            }

            if (actionState == null)
            {
                actionState = GetOrCreateActionState();
            }

            InitializeInputActions();
        }

        private void InitializeInputActions()
        {
            if (inputActions == null)
            {
                inputActions = new InputSystem_Actions();
                inputActions.Player.Skill1.performed += OnSkill1Performed;
                inputActions.Player.Skill2.performed += OnSkill2Performed;
                inputActions.Player.Skill3.performed += OnSkill3Performed;
                inputActions.Player.Skill4.performed += OnSkill4Performed;
                inputActions.Player.Skill5.performed += OnSkill5Performed;
                inputActions.Player.Skill6.performed += OnSkill6Performed;
                inputActions.Player.Evade.performed += OnEvadePerformed;
            }

            inputActions.Player.Enable();
        }

        public override void OnNetworkDespawn()
        {
            CleanupInputActions();
        }

        private void OnDisable()
        {
            CleanupInputActions();
        }

        private void OnEnable()
        {
            if (IsOwner && inputActions != null)
            {
                inputActions.Player.Enable();
            }
        }

        private void CleanupInputActions()
        {
            if (inputActions != null)
            {
                inputActions.Player.Disable();
            }
        }

        /// <summary>
        /// 스킬 입력 처리
        /// </summary>
        private void OnSkillInput(int slotIndex)
        {
            if (slotIndex < 0 || slotIndex >= skillSlots.Length)
                return;

            SkillData skill = skillSlots[slotIndex];
            if (skill == null)
            {
                Debug.Log($"Skill slot {slotIndex + 1} is empty");
                return;
            }

            // 사망 상태 체크
            if (actionState != null && !actionState.CanStartSkill(skill))
                return;

            // 로컬 체크 (빠른 피드백용)
            if (skillController.IsExecutingSkill)
            {
                Debug.Log($"Already executing skill");
                return;
            }

            if (skillController.IsOnCooldown(skill))
            {
                Debug.Log($"Skill {skill.SkillName} is on cooldown");
                return;
            }

            // 마나 비용 체크 (무기 배율 적용)
            float actualManaCost = GetActualManaCost(skill);
            if (networkController != null && networkController.Mana < actualManaCost)
            {
                Debug.Log($"Not enough mana for skill: {skill.SkillName}");
                return;
            }

            // 서버에 스킬 실행 요청
            RequestSkillExecutionRpc(slotIndex);
        }

        /// <summary>
        /// 서버에 스킬 실행 요청
        /// </summary>
        [Rpc(SendTo.Server)]
        private void RequestSkillExecutionRpc(int slotIndex)
        {
            if (slotIndex < 0 || slotIndex >= skillSlots.Length)
                return;

            SkillData skill = skillSlots[slotIndex];
            if (skill == null) return;

            // 서버에서 다시 검증
            if (actionState != null && !actionState.CanStartSkill(skill))
                return;

            if (skillController.IsExecutingSkill || skillController.IsOnCooldown(skill))
                return;

            // 마나 비용 체크 (무기 배율 적용)
            float actualManaCost = GetActualManaCost(skill);
            if (networkController != null && networkController.Mana < actualManaCost)
                return;

            // 마나 소모 (무기 배율 적용)
            if (networkController != null && actualManaCost > 0)
            {
                networkController.UseManaRpc(actualManaCost);
            }

            // 모든 클라이언트에 스킬 실행 전파
            BroadcastSkillExecutionRpc(slotIndex);
        }

        /// <summary>
        /// 모든 클라이언트에 스킬 실행 전파
        /// </summary>
        [Rpc(SendTo.ClientsAndHost)]
        private void BroadcastSkillExecutionRpc(int slotIndex)
        {
            if (slotIndex < 0 || slotIndex >= skillSlots.Length)
                return;

            SkillData skill = skillSlots[slotIndex];
            if (skill == null) return;

            // 모든 클라이언트에서 스킬 실행 (애니메이션 포함)
            skillController.ExecuteSkill(skill);
        }

        /// <summary>
        /// 무기 마나 배율이 적용된 실제 마나 비용 계산
        /// </summary>
        private float GetActualManaCost(SkillData skill)
        {
            if (skill == null) return 0f;

            float baseCost = skill.ManaCost;
            float multiplier = weaponEquipment != null ? weaponEquipment.ManaCostMultiplier : 1f;

            return baseCost * multiplier;
        }

        /// <summary>
        /// 스킬 슬롯 접근자
        /// </summary>
        public SkillData GetSkill(int slotIndex)
        {
            if (slotIndex < 0 || slotIndex >= skillSlots.Length)
                return null;
            return skillSlots[slotIndex];
        }

        /// <summary>
        /// 스킬 슬롯 변경
        /// </summary>
        public void SetSkill(int slotIndex, SkillData skill)
        {
            if (slotIndex < 0 || slotIndex >= skillSlots.Length)
                return;

            skillSlots[slotIndex] = skill;
        }

        /// <summary>
        /// 남은 쿨타임 조회
        /// </summary>
        public float GetRemainingCooldown(int slotIndex)
        {
            SkillData skill = GetSkill(slotIndex);
            if (skill == null) return 0f;

            return skillController.GetRemainingCooldown(skill);
        }

        /// <summary>
        /// 스킬 사용 가능 여부
        /// </summary>
        public bool CanUseSkill(int slotIndex)
        {
            SkillData skill = GetSkill(slotIndex);
            if (skill == null) return false;

            if (actionState != null && !actionState.CanStartSkill(skill))
                return false;

            return !skillController.IsOnCooldown(skill) && !skillController.IsExecutingSkill;
        }

        /// <summary>
        /// 디버그용 스킬 시전 진입점입니다.
        /// 로컬 플레이어 검증 시 지정한 슬롯의 스킬을 즉시 요청합니다.
        /// </summary>
        public void DebugCastSkill(int slotIndex)
        {
            if (!IsOwner)
                return;

            OnSkillInput(slotIndex);
        }

        private void OnSkill1Performed(InputAction.CallbackContext context) => OnSkillInput(0);

        private void OnSkill2Performed(InputAction.CallbackContext context) => OnSkillInput(1);

        private void OnSkill3Performed(InputAction.CallbackContext context) => OnSkillInput(2);

        private void OnSkill4Performed(InputAction.CallbackContext context) => OnSkillInput(3);

        private void OnSkill5Performed(InputAction.CallbackContext context) => OnSkillInput(4);

        private void OnSkill6Performed(InputAction.CallbackContext context) => OnSkillInput(5);

        private void OnEvadePerformed(InputAction.CallbackContext context) => OnSkillInput(6);

        private PlayerActionState GetOrCreateActionState()
        {
            var foundState = GetComponent<PlayerActionState>();
            if (foundState != null)
                return foundState;

            return gameObject.AddComponent<PlayerActionState>();
        }
    }
}