using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using TMPro;
using Northbound.Data;

namespace Northbound
{
    /// <summary>
    /// 개별 건물 슬롯 버튼
    /// </summary>
    [RequireComponent(typeof(EventTrigger))]
    public class BuildingSlotButton : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        [Header("UI References")]
        [SerializeField] private Image iconImage;
        [SerializeField] private TextMeshProUGUI nameText;
        [SerializeField] private TextMeshProUGUI hotkeyText;
        [SerializeField] private Image backgroundImage;
        [SerializeField] private Button button;

        [Header("Visual Settings")]
        [SerializeField] private Color normalColor = new Color(0.2f, 0.2f, 0.2f, 0.8f);
        [SerializeField] private Color selectedColor = new Color(0.3f, 0.6f, 0.3f, 1f);
        [SerializeField] private Color hoverColor = new Color(0.3f, 0.3f, 0.3f, 1f);

        private TowerData buildingData;
        private int slotIndex;
        private BuildingQuickslotUI quickslotUI;
        private bool isSelected = false;

        private void Awake()
        {
            if (button == null)
                button = GetComponent<Button>();

            if (button != null)
            {
                button.onClick.AddListener(OnButtonClicked);
            }
        }

        /// <summary>
        /// 슬롯 초기화
        /// </summary>
        public void Initialize(TowerData data, int index, BuildingQuickslotUI ui)
        {
            buildingData = data;
            slotIndex = index;
            quickslotUI = ui;

            UpdateVisuals();
        }

        /// <summary>
        /// UI 업데이트
        /// </summary>
        private void UpdateVisuals()
        {
            if (buildingData == null) return;

            // 아이콘 설정
            if (iconImage != null && buildingData.icon != null)
            {
                iconImage.sprite = buildingData.icon;
                iconImage.enabled = true;
            }
            else if (iconImage != null)
            {
                iconImage.enabled = false;
            }

            // 이름 설정
            if (nameText != null)
            {
                nameText.text = buildingData.buildingName;
            }

            // 배경 색상
            UpdateBackgroundColor();
        }

        /// <summary>
        /// 핫키 텍스트 설정
        /// </summary>
        public void SetHotkeyText(string text)
        {
            if (hotkeyText != null)
            {
                hotkeyText.text = text;
            }
        }

        /// <summary>
        /// 버튼 클릭 이벤트
        /// </summary>
        private void OnButtonClicked()
        {
            if (quickslotUI != null)
            {
                quickslotUI.SelectBuilding(slotIndex);
            }
        }

        /// <summary>
        /// 선택 상태 설정
        /// </summary>
        public void SetSelected(bool selected)
        {
            isSelected = selected;
            UpdateBackgroundColor();
        }

        /// <summary>
        /// 배경 색상 업데이트
        /// </summary>
        private void UpdateBackgroundColor()
        {
            if (backgroundImage != null)
            {
                backgroundImage.color = isSelected ? selectedColor : normalColor;
            }
        }

        /// <summary>
        /// 마우스 호버 시 (IPointerEnterHandler)
        /// </summary>
        public void OnPointerEnter(PointerEventData eventData)
        {
            if (backgroundImage != null && !isSelected)
            {
                backgroundImage.color = hoverColor;
            }
        }

        /// <summary>
        /// 마우스 호버 해제 시 (IPointerExitHandler)
        /// </summary>
        public void OnPointerExit(PointerEventData eventData)
        {
            if (backgroundImage != null && !isSelected)
            {
                backgroundImage.color = normalColor;
            }
        }

        /// <summary>
        /// 건물 이름 반환
        /// </summary>
        public string GetBuildingName()
        {
            return buildingData != null ? buildingData.buildingName : "Unknown";
        }
    }
}