using UnityEngine;
using UnityEngine.InputSystem;
using Synty.AnimationBaseLocomotion.Samples.InputSystem;

public class MeleeCombatLayerController : MonoBehaviour
{
    [Header("References")]
    [Tooltip("The InputReader on your character - same one the player controller uses")]
    [SerializeField] private InputReader _inputReader;

    [Tooltip("The Animator on your character")]
    [SerializeField] private Animator _animator;

    [Tooltip("Your main camera's transform - used to know where you're looking")]
    [SerializeField] private Transform _cameraTransform;

    [Header("Weapon Management")]
    [Tooltip("The active weapon used for damage and stats.")]
    [SerializeField] private Weapon _currentWeapon;

    [Tooltip("The Transform socket where the weapon is held when equipped (e.g., Prop_R)")]
    [SerializeField] private Transform _equippedSocket;

    [Tooltip("The Transform socket where the weapon rests when put away (e.g., Spine_03 or a Back Socket)")]
    [SerializeField] private Transform _unequippedSocket;

    [Header("Layer Settings")]
    [Tooltip("The name of the Animator layer containing the melee override (e.g. 'Melee')")]
    [SerializeField] private string _meleeLayerName = "Melee";
    
    [Tooltip("How fast the melee layer blends in and out when equipping. Higher = snappier.")]
    [SerializeField] private float _equipBlendSpeed = 5f;

    [Header("Combat Settings")]
    [Tooltip("Layers to consider as targets when attacking")]
    [SerializeField] private LayerMask _targetLayers;

    [Header("Input Actions")]
    [Tooltip("Input action for attacking")]
    [SerializeField] private InputAction _attackAction = new InputAction("Attack", binding: "<Mouse>/leftButton");
    [Tooltip("Input action for blocking")]
    [SerializeField] private InputAction _blockAction = new InputAction("Block", binding: "<Mouse>/rightButton");

    // Animation Hashes
    private readonly int _powerUpHash = Animator.StringToHash("PowerUp");
    private readonly int _attackHash = Animator.StringToHash("Attack");
    private readonly int _isBlockingHash = Animator.StringToHash("IsBlocking");
    private readonly int _takeDamageHash = Animator.StringToHash("TakeDamage");

    // Runtime state
    private bool _isEquipped;
    private bool _isBlocking;
    private bool _isPoweringUp;
    private float _equipWeight;
    private int _meleeLayerIndex;


    private void Start()
    {
        _meleeLayerIndex = _animator.GetLayerIndex(_meleeLayerName);
        
        // If the referenced weapon is a prefab asset (not in the scene), instantiate it
        if (_currentWeapon != null && !_currentWeapon.gameObject.scene.IsValid())
        {
            _currentWeapon = Instantiate(_currentWeapon);
        }

        // Start with weapon in correct socket
        UpdateWeaponSocket();

        // Try getting the main camera if not set
        if (_cameraTransform == null && Camera.main != null)
        {
            _cameraTransform = Camera.main.transform;
        }
    }

    private void OnEnable()
    {
        _attackAction.started += OnAttackStarted;
        _attackAction.canceled += OnAttackCanceled;
        _blockAction.started += OnBlockStarted;
        _blockAction.canceled += OnBlockCanceled;

        _attackAction.Enable();
        _blockAction.Enable();
    }

    private void OnDisable()
    {
        _attackAction.started -= OnAttackStarted;
        _attackAction.canceled -= OnAttackCanceled;
        _blockAction.started -= OnBlockStarted;
        _blockAction.canceled -= OnBlockCanceled;

        _attackAction.Disable();
        _blockAction.Disable();
    }

    private void Update()
    {
        // Blend the melee layer weight based on equip state
        float equipTarget = _isEquipped ? 1f : 0f;
        _equipWeight = Mathf.MoveTowards(_equipWeight, equipTarget, _equipBlendSpeed * Time.deltaTime);

        if (_meleeLayerIndex != -1)
        {
            _animator.SetLayerWeight(_meleeLayerIndex, _equipWeight);
        }

        // Send parameters to animator
        if (_animator != null)
        {
            _animator.SetBool(_isBlockingHash, _isBlocking);
        }
    }

    public bool IsEquipped => _isEquipped;
    
    public System.Collections.IEnumerator EquipWeapon()
    {
        if (_isEquipped) yield break;

        _isEquipped = true;
        
        if (_meleeLayerIndex != -1)
        {
            _animator.Play("Equip", _meleeLayerIndex, 0f);
        }

        // Wait for the hand to reach the weapon on the back before snapping it to the hand
        yield return new WaitForSeconds(0.3f);

        UpdateWeaponSocket();
    }

    public System.Collections.IEnumerator UnequipWeapon()
    {
        if (!_isEquipped) yield break;

        // Cancel block and power up
        if (_isBlocking)
        {
            _isBlocking = false;
            _inputReader.onWalkToggled?.Invoke();
        }
        if (_isPoweringUp)
        {
            _isPoweringUp = false;
            if (_animator != null) _animator.SetBool(_powerUpHash, false);
        }

        // Play the Unequip animation
        if (_meleeLayerIndex != -1)
        {
            _animator.Play("Unequip", _meleeLayerIndex, 0f);
        }

        // Wait for the unequip animation to finish before snapping to the back
        // Adjust this 0.5f duration to match the length of your actual unequip animation!
        yield return new WaitForSeconds(0.5f);

        _isEquipped = false;
        UpdateWeaponSocket();
    }

    private void UpdateWeaponSocket()
    {
        if (_currentWeapon == null) return;

        Transform targetSocket = _isEquipped ? _equippedSocket : _unequippedSocket;
        
        if (targetSocket != null)
        {
            _currentWeapon.transform.SetParent(targetSocket, false);
            
            if (_isEquipped)
            {
                _currentWeapon.transform.localPosition = _currentWeapon.equippedPositionOffset;
                _currentWeapon.transform.localRotation = Quaternion.Euler(_currentWeapon.equippedRotationOffset);
            }
            else
            {
                _currentWeapon.transform.localPosition = _currentWeapon.unequippedPositionOffset;
                _currentWeapon.transform.localRotation = Quaternion.Euler(_currentWeapon.unequippedRotationOffset);
            }
        }
    }

    #region Input Handlers

    private void OnAttackStarted(InputAction.CallbackContext context)
    {
        if (!_isEquipped || _isBlocking) return; 

        _isPoweringUp = true;
        if (_animator != null)
        {
            _animator.SetBool(_powerUpHash, true);
        }
    }

    private void OnAttackCanceled(InputAction.CallbackContext context)
    {
        if (_isPoweringUp)
        {
            _isPoweringUp = false;
            
            if (_animator != null)
            {
                _animator.SetBool(_powerUpHash, false);
            }
            
            Attack();
        }
    }

    private void OnBlockStarted(InputAction.CallbackContext context)
    {
        // Don't allow blocking if the weapon is put away
        if (!_isEquipped) return;
        _isBlocking = true;
        
        // Slow down to walk speed while blocking
        _inputReader.onWalkToggled?.Invoke();
    }

    private void OnBlockCanceled(InputAction.CallbackContext context)
    {
        if (_isBlocking)
        {
            _isBlocking = false;
            
            // Return to normal speed
            _inputReader.onWalkToggled?.Invoke();
        }
    }

    #endregion

    #region Combat Actions

    public void Attack()
    {
        if (_animator != null)
        {
            _animator.SetTrigger(_attackHash);
        }
    }

    /// <summary>
    ///     Performs hit detection. Call this from an Animation Event on the Attack animation.
    /// </summary>
    /// <summary>
    /// Alias for Synty's built-in "Hit" animation event.
    /// </summary>
    public void Hit()
    {
        DealDamage();
    }

    public void DealDamage()
    {
        if (_currentWeapon == null)
        {
            Debug.LogWarning("No weapon assigned to deal damage!");
            return;
        }

        Collider[] hitColliders;

        if (_currentWeapon.hitShape == Weapon.HitShape.Sphere)
        {
            hitColliders = Physics.OverlapSphere(_currentWeapon.GetHitCenter(), _currentWeapon.attackRadius, _targetLayers);
        }
        else
        {
            hitColliders = Physics.OverlapBox(_currentWeapon.GetHitCenter(), _currentWeapon.hitBoxHalfExtents, _currentWeapon.GetHitRotation(), _targetLayers);
        }
        
        foreach (Collider hit in hitColliders)
        {
            Debug.Log($"Melee hit {hit.name} for {_currentWeapon.damage} damage!");
            hit.GetComponent<WorldObject>()?.TakeDamage(_currentWeapon.damage);
        }
    }

    public void TakeDamage(float amount)
    {
        if (_isBlocking)
        {
            Debug.Log($"Blocked {amount} damage!");
            return;
        }

        Debug.Log($"Took {amount} damage!");
        if (_animator != null)
        {
            _animator.SetTrigger(_takeDamageHash);
        }
    }

    #endregion


    }