using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace TcgEngine.UI
{
    /// <summary>
    /// 卡组分帧加载器
    /// </summary>
    public class CardUILoading : MonoBehaviour
    {
        public CardGrid grid_content;
        public GameObject card_prefab;

        private List<CollectionCard> all_list = new List<CollectionCard>();

        private bool spawned = false;

        // 分帧加载
        private Coroutine spawnRoutine;

        private static CardUILoading instance;

        protected void Awake()
        {
            instance = this;
        }

        private void Start()
        {
            grid_content = CollectionPanel.Get().grid_content;
            card_prefab = CollectionPanel.Get().card_prefab;

            if (!spawned)
            {
                if (spawnRoutine != null)
                    StopCoroutine(spawnRoutine);
                spawnRoutine = StartCoroutine(SpawnCardsCoroutine());
            }

        }

        private IEnumerator SpawnCardsCoroutine()
        {
            spawned = true;
            foreach (CollectionCard card in all_list)
                Destroy(card.gameObject);
            all_list.Clear();
            
            // 首帧压力大，先让出 帧
            for (int i = 0; i < 5; i++)
                yield return null;

            int batchSize = 15; // 每帧生成
            int counter = 0;

            List<VariantData> variants = VariantData.GetAll();
            List<CardData> cards = CardData.GetAll();

            foreach (VariantData variant in variants)
            {
                foreach (CardData card in cards)
                {
                    GameObject nCard = Instantiate(card_prefab, grid_content.transform);
                    CollectionCard dCard = nCard.GetComponent<CollectionCard>();
                    dCard.SetCard(card, variant, 0);

                    all_list.Add(dCard);
                    nCard.SetActive(false);

                    counter++;
                    if (counter % batchSize == 0)
                    {
                        yield return null;
                    }
                }
            }
        }
        
        public List<CollectionCard> CardList()
        {
            return all_list;
        }
        
        public static CardUILoading Get()
        {
            return instance;
        }
    }

}