using System;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;

namespace DDD
{
    public enum ButtonState
    {
        Normal,
        Highlighted,
        Pressed,
        Selected,
        Disabled
    }

    public enum ButtonType
    {
        Normal = 0,
        Toggle
    }
    
    [RequireComponent(typeof(Button))]
    public class CommonButton : MonoBehaviour, IInteractableUi, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler, 
        IPointerDownHandler, IPointerUpHandler, ISelectHandler, IDeselectHandler, ISubmitHandler
    {
        [SerializeField] private Button _button;
        [SerializeField] private Animator _animator;
        [SerializeField] private bool _isEnabled = true;
        [SerializeField] private bool _synchronizeStates = true;
        [SerializeField] private ButtonType _buttonType;
        
        private bool _isPressed;
        private bool _isHighlighted;
        private bool _isSelected;
        private bool _isToggled;

        private readonly int _normalHash = Animator.StringToHash("Normal");
        private readonly int _highlightedHash = Animator.StringToHash("Highlighted");
        private readonly int _pressedHash = Animator.StringToHash("Pressed");
        private readonly int _selectedHash = Animator.StringToHash("Selected");
        private readonly int _toggleHash = Animator.StringToHash("Toggled");
        private readonly int _disabledHash = Animator.StringToHash("Disabled");
        private readonly int _isEnabledHash = Animator.StringToHash("Enabled");

        private void OnEnable()
        {
            _isPressed = false;
            _isHighlighted = false;
            _isSelected = false;
            _isToggled = false;
            
            UpdateVisualState();
        }

        private void OnDestroy()
        {
            if (_button)
            {
                _button.onClick.RemoveAllListeners();
            }
        }
        
        private void UpdateVisualState()
        {
            if (gameObject.activeInHierarchy == false || _synchronizeStates == false) return;
            
            var currentState = GetCurrentState();
            ApplyVisualState(currentState);
        }
        
        private ButtonState GetCurrentState()
        {
            if (_buttonType == ButtonType.Normal)
            {
                if (_button.interactable == false)
                {
                    return ButtonState.Disabled;
                }
                if (_isPressed)
                {
                    return ButtonState.Pressed;
                }
                if (_isSelected)
                {
                    return ButtonState.Selected;
                }
                return ButtonState.Normal;
            }
            if (_buttonType == ButtonType.Toggle)
            {
                if (_isToggled)
                {
                    return ButtonState.Selected;
                }
                if (_isPressed)
                {
                    return ButtonState.Pressed;
                }
                if (_isSelected || _isHighlighted)
                {
                    return ButtonState.Highlighted;
                }
                if (_button.interactable == false)
                {
                    return ButtonState.Disabled;
                }
            }

            return ButtonState.Normal;
        }
        
        private void ApplyVisualState(ButtonState state)
        {
            if (_animator && _animator.runtimeAnimatorController)
            {
                ApplyAnimatorState(state);
            }
        }
        
        private void ApplyAnimatorState(ButtonState state)
        {
            _animator.SetBool(_isEnabledHash, _isEnabled);
            _animator.SetBool(_highlightedHash, _isHighlighted);
            _animator.SetBool(_pressedHash, _isPressed);
            _animator.SetBool(_selectedHash, _isSelected);
            _animator.SetBool(_toggleHash, _isToggled);
            _animator.SetBool(_disabledHash, !_button.interactable);
        }
        
        public void OnInteract()
        {
            _button.onClick.Invoke();
        }
        
        public void OnPointerClick(PointerEventData eventData)
        {
            UpdateVisualState();
        }
        
        public void OnPointerEnter(PointerEventData eventData)
        {
            if (_button.interactable == false) return;
            
            if (_buttonType == ButtonType.Normal)
            {
                _isSelected = true;
                EventSystem.current.SetSelectedGameObject(gameObject);
            }
            else if (_buttonType == ButtonType.Toggle)
            {
                _isHighlighted = true;
            }
            UpdateVisualState();
        }
        
        public void OnPointerExit(PointerEventData eventData)
        {
            if (_button.interactable == false) return;
            
            if (_buttonType == ButtonType.Normal)
            {
                _isSelected = false;
            }
            else if (_buttonType == ButtonType.Toggle)
            {
                _isHighlighted = false;
            }
            UpdateVisualState();
        }
        
        public void OnPointerDown(PointerEventData eventData)
        {
            if (_button.interactable == false) return;
            
            if (eventData.button == PointerEventData.InputButton.Left)
            {
                _isPressed = true;
                UpdateVisualState();
            }
        }
        
        public void OnPointerUp(PointerEventData eventData)
        {
            if (_button.interactable == false) return;
            
             if (eventData.button == PointerEventData.InputButton.Left)
            {
                _isPressed = false;
                if (_buttonType == ButtonType.Normal)
                {
                    _isSelected = false;
                }
                else if (_buttonType == ButtonType.Toggle)
                {
                    _isHighlighted = false;
                    _isToggled = true;
                }
                UpdateVisualState();
            }
        }
        
        public void OnSelect(BaseEventData eventData)
        {
            if (_button.interactable == false) return;
            
            if (_buttonType == ButtonType.Normal)
            {
                _isSelected = true;
            }
            else if (_buttonType == ButtonType.Toggle)
            {
                _isHighlighted = true;
            }
            UpdateVisualState();
        }
        
        public void OnDeselect(BaseEventData eventData)
        {
            if (_button.interactable == false) return;
            
            if (_buttonType == ButtonType.Normal)
            {
                _isSelected = false;
            }
            else if (_buttonType == ButtonType.Toggle)
            {
                _isHighlighted = false;
            }
            UpdateVisualState();
        }
        
        public void OnSubmit(BaseEventData eventData)
        {
            _button.onClick.Invoke();
        }
        
        public void AddListener(UnityAction action) => _button.onClick.AddListener(action);
        public void RemoveListener(UnityAction action) => _button?.onClick.RemoveListener(action);
        public void RemoveAllListeners() => _button.onClick.RemoveAllListeners();

        public bool IsEnabled => _isEnabled;
        public bool IsInteractable => _button.interactable;

        public void SetInteractable(bool interactable)
        {
            _button.interactable = interactable;
            UpdateVisualState();
        }
        
        public void SetToggle(bool isSelected)
        {
            if (_buttonType == ButtonType.Toggle)
            {
                _isToggled = isSelected;
                _isHighlighted = false;
                _button.interactable = !isSelected;
            }
            
            UpdateVisualState();
        }
        
        public void ForceUpdateState()
        {
            UpdateVisualState();
        }
        
        public bool UseToggle
        {
            get => _buttonType == ButtonType.Toggle;
            set => _buttonType = value ? ButtonType.Toggle : ButtonType.Normal;
        }
        
        public bool IsToggled => _isToggled;
        
        public void SetToggleState(bool toggled)
        {
            if (_buttonType != ButtonType.Toggle) return;
            
            _isToggled = toggled;
            _isPressed = false;
            if (!toggled)
            {
                _isSelected = false;
            }
            
            UpdateVisualState();
        }
    }
}