using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using VRShopping.Items;
using VRShopping.Player;
using VRShopping.Shopping;
using VRShopping.UI;

namespace VRShopping.Interact
{
    public class CheckoutMachine : MonoBehaviour
    {
        public int CheckoutSum { get; private set; }

        [SerializeField] private Transform _rowContainer;
        [SerializeField] private CheckoutProductionRow _rowPrefab;
        private readonly Dictionary<string, CheckoutProductionRow> _rowByItemId = new();
        private int _nextOrderNum = 1;

        [SerializeField] private TMP_Text _checkoutSumField;

        private void Start()
        {
            UpdateSumUI();
        }

        public void UpdateSumUI()
        {
            if (_checkoutSumField != null)
                _checkoutSumField.text = CheckoutSum.ToString("N0");
        }

        public void AddCheckoutProduction(ItemData itemData)
        {
            if (itemData == null) return;

            if (_rowByItemId.TryGetValue(itemData.ItemId, out CheckoutProductionRow row))
            {
                row.Bind(itemData, row.Quantity + 1);
            }
            else
            {
                row = Instantiate(_rowPrefab, _rowContainer);
                row.gameObject.SetActive(false);              // OnEnable 지연
                row.Bind(itemData, 1);
                row.SetOrderNum(_nextOrderNum++);

                Canvas.ForceUpdateCanvases();
                LayoutRebuilder.ForceRebuildLayoutImmediate(_rowContainer as RectTransform);

                row.gameObject.SetActive(true);               // 바운드 확정 후 OnEnable
                row.OnAddClicked += AddCheckoutProduction;
                row.OnRemoveClicked += RemoveCheckoutProduction;

                _rowByItemId[itemData.ItemId] = row;
            }

            CheckoutSum += itemData.FinalPrice;

            UpdateSumUI();
        }

        public void RemoveCheckoutProduction(ItemData itemData)
        {
            if (itemData == null) return;
            if (!_rowByItemId.TryGetValue(itemData.ItemId, out CheckoutProductionRow row)) return;

            CheckoutSum -= itemData.FinalPrice;

            if (row.Quantity <= 1)
            {
                _rowByItemId.Remove(itemData.ItemId);
                Destroy(row.gameObject);
            }
            else
            {
                row.Bind(itemData, row.Quantity - 1);
            }

            UpdateSumUI();
        }

        public List<CheckoutProductionRow> GetCheckoutList()
        {
            var list = new List<CheckoutProductionRow>(_rowByItemId.Values);
            list.Sort((a, b) => a.OrderNum.CompareTo(b.OrderNum));
            return list;
        }
    }
}