using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public sealed class ShopView : MonoBehaviour
{
    [SerializeField] private Transform itemContainer;
    [SerializeField] private ShopItemView itemPrefab;
    [SerializeField] private TMP_Text currencyText;
    [SerializeField] private Button closeButton;

    private readonly List<ShopItemView> spawnedItems = new();

    public event Action<ModifierData> OnBuyClicked;

    private void Awake()
    {
        if (closeButton != null)
            closeButton.onClick.AddListener(Hide);
    }

    private void OnDestroy()
    {
        if (closeButton != null)
            closeButton.onClick.RemoveListener(Hide);
    }

    public void Show() => gameObject.SetActive(true);
    public void Hide() => gameObject.SetActive(false);
    public bool IsVisible => gameObject.activeSelf;

    public void Populate(IReadOnlyList<ModifierData> catalog, ShopModel model)
    {
        ClearItems();

        for (int i = 0; i < catalog.Count; i++)
        {
            var data = catalog[i];
            if (data == null) continue;

            var item = Instantiate(itemPrefab, itemContainer);
            var state = model.GetItemState(data);
            item.Setup(data, state);
            item.OnBuyClicked += HandleBuy;
            spawnedItems.Add(item);
        }
    }

    public void RefreshStates(IReadOnlyList<ModifierData> catalog, ShopModel model)
    {
        for (int i = 0; i < spawnedItems.Count && i < catalog.Count; i++)
        {
            var state = model.GetItemState(catalog[i]);
            spawnedItems[i].SetState(state);
        }
    }

    public void UpdateCurrencyDisplay(int currency)
    {
        if (currencyText != null)
            currencyText.text = currency.ToString();
    }

    private void ClearItems()
    {
        for (int i = 0; i < spawnedItems.Count; i++)
        {
            spawnedItems[i].OnBuyClicked -= HandleBuy;
            Destroy(spawnedItems[i].gameObject);
        }
        spawnedItems.Clear();
    }

    private void HandleBuy(ModifierData data) => OnBuyClicked?.Invoke(data);
}