using System.Collections.Generic;
using GameFramework.ObjectPool;
using GeometryTD.CustomEvent;
using GeometryTD.PoolObjectBase;
using TMPro;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.UI
{
    public class CombatFinishForm : UGuiForm
    {
        [SerializeField] private TMP_Text _enemyKilledText;
        [SerializeField] private TMP_Text _goldGainedText;
        [SerializeField] private Transform _itemGainedParent;
        [SerializeField] private RepoItem _itemTemplate;
        [SerializeField] private int _instancePoolCapacity = 16;

        private readonly List<RepoItem> _activeItems = new List<RepoItem>();
        private IObjectPool<RepoItemObject> _itemPool;
        private string _poolName;
        private CombatFinishFormContext _context;

        public void RefreshUI(CombatFinishFormContext context)
        {
            _context = context;

            if (_enemyKilledText != null)
            {
                _enemyKilledText.text = context?.EnemyKilledText ?? "0";
            }

            if (_goldGainedText != null)
            {
                _goldGainedText.text = context?.GoldGainedText ?? "0";
            }

            RefreshRewardItems(context?.RewardItems);
        }

        public void OnReturnButtonClick()
        {
            if (_context != null && !_context.CanReturn)
            {
                return;
            }

            GameEntry.Event.Fire(this, CombatFinishReturnEventArgs.Create());
        }

        protected override void OnOpen(object userData)
        {
            base.OnOpen(userData);

            if (userData is CombatFinishFormContext context)
            {
                RefreshUI(context);
                return;
            }

            Log.Warning("CombatFinishForm requires CombatFinishFormContext as userData.");
        }

        protected override void OnClose(bool isShutdown, object userData)
        {
            _context = null;

            if (_enemyKilledText != null)
            {
                _enemyKilledText.text = string.Empty;
            }

            if (_goldGainedText != null)
            {
                _goldGainedText.text = string.Empty;
            }

            ClearRewardItems();
            base.OnClose(isShutdown, userData);
        }

        private void OnDestroy()
        {
            ClearRewardItems();
            _itemPool?.ReleaseAllUnused();
        }

        private void EnsurePool()
        {
            if (_itemPool != null)
            {
                return;
            }

            _poolName = $"CombatFinishRepoItemPool_{GetInstanceID()}";
            _itemPool = GameEntry.ObjectPool.CreateSingleSpawnObjectPool<RepoItemObject>(_poolName, _instancePoolCapacity);
        }

        private void RefreshRewardItems(RepoItemContext[] rewardItems)
        {
            ClearRewardItems();

            if (rewardItems == null || rewardItems.Length <= 0)
            {
                return;
            }

            EnsurePool();

            for (int i = 0; i < rewardItems.Length; i++)
            {
                RepoItem item = CreateOrSpawnItem();
                if (item == null)
                {
                    continue;
                }

                item.gameObject.SetActive(true);
                item.OnInit(rewardItems[i]);
                _activeItems.Add(item);
            }
        }

        private void ClearRewardItems()
        {
            for (int i = _activeItems.Count - 1; i >= 0; i--)
            {
                RepoItem item = _activeItems[i];
                if (item == null)
                {
                    continue;
                }

                item.OnReset();
                item.gameObject.SetActive(false);
                _itemPool?.Unspawn(item);
            }

            _activeItems.Clear();
        }

        private RepoItem CreateOrSpawnItem()
        {
            if (_itemGainedParent == null)
            {
                Log.Warning("CombatFinishForm requires an item gained parent.");
                return null;
            }

            if (_itemPool == null)
            {
                return null;
            }

            RepoItemObject itemObject = _itemPool.Spawn();
            RepoItem item = itemObject != null ? (RepoItem)itemObject.Target : null;
            if (item == null)
            {
                if (_itemTemplate == null)
                {
                    Log.Warning("CombatFinishForm requires an item template.");
                    return null;
                }

                item = Instantiate(_itemTemplate);
                _itemPool.Register(RepoItemObject.Create(item), true);
            }

            item.transform.SetParent(_itemGainedParent, false);
            return item;
        }
    }
}