using System;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using YachtDice.Modifiers.Core;
using YachtDice.Modifiers.Definition;

namespace YachtDice.Shop
{
    public class ShopItemView : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        [SerializeField] private Image iconImage;
        [SerializeField] private TMP_Text nameText;
        [SerializeField] private TMP_Text descriptionText;
        [SerializeField] private TMP_Text priceText;
        [SerializeField] private TMP_Text rarityText;
        [SerializeField] private Button buyButton;
        [SerializeField] private TMP_Text buyButtonText;
        [SerializeField] private Image background;

        [Header("Rarity Colors")]
        [SerializeField] private Color commonColor = Color.white;
        [SerializeField] private Color uncommonColor = new(0.4f, 0.8f, 0.4f);
        [SerializeField] private Color rareColor = new(0.4f, 0.6f, 1f);
        [SerializeField] private Color epicColor = new(0.8f, 0.4f, 1f);

        private IShopItem _data;

        public event Action<IShopItem> OnBuyClicked;
        public event Action<IShopItem, RectTransform> OnHoverEnter;
        public event Action OnHoverExit;

        private void Awake()
        {
            if (buyButton != null)
                buyButton.onClick.AddListener(() => OnBuyClicked?.Invoke(_data));
        }

        public void Setup(IShopItem item, ShopItemState state)
        {
            _data = item;

            if (nameText != null) nameText.text = _data.DisplayName;
            if (descriptionText != null) descriptionText.text = _data.Description;
            if (priceText != null) priceText.text = _data.ShopPrice.ToString();
            if (iconImage != null && _data.Icon != null) iconImage.sprite = _data.Icon;

            if (rarityText != null)
            {
                if (_data is ModifierDefinition mod)
                {
                    rarityText.gameObject.SetActive(true);
                    rarityText.text = mod.Rarity.ToString();
                    rarityText.color = GetRarityColor(mod.Rarity);
                }
                else
                {
                    rarityText.gameObject.SetActive(false);
                }
            }

            SetState(state);
        }

        public void SetState(ShopItemState state)
        {
            if (buyButton == null) return;

            switch (state)
            {
                case ShopItemState.Available:
                    buyButton.interactable = true;
                    if (buyButtonText != null) buyButtonText.text = "Buy";
                    break;
                case ShopItemState.RepurchaseAvailable:
                    buyButton.interactable = true;
                    if (buyButtonText != null) buyButtonText.text = "Buy";
                    break;
                case ShopItemState.TooExpensive:
                    buyButton.interactable = false;
                    if (buyButtonText != null) buyButtonText.text = "Buy";
                    break;
                case ShopItemState.Owned:
                    buyButton.interactable = false;
                    if (buyButtonText != null) buyButtonText.text = "Owned";
                    break;
            }
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            OnHoverEnter?.Invoke(_data, transform as RectTransform);
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            OnHoverExit?.Invoke();
        }

        private Color GetRarityColor(ModifierRarity rarity)
        {
            return rarity switch
            {
                ModifierRarity.Common => commonColor,
                ModifierRarity.Uncommon => uncommonColor,
                ModifierRarity.Rare => rareColor,
                ModifierRarity.Epic => epicColor,
                _ => commonColor
            };
        }
    }
}