using System.Collections.Generic;
using SepCore.Event;
using UnityGameFramework.Runtime;

namespace SepCore.UI
{
    public partial class LevelUpForm : UGuiForm
    {
        private readonly List<LevelUpRewardItem> _rewardItems = new List<LevelUpRewardItem>();

        private LevelUpContext _context;

        private bool _listenersBound;

        public void RefreshUI(LevelUpContext context)
        {
            EnsureButtonListeners();

            _context = context;

            if (View.levelUpRewardTemplate.gameObject.activeSelf)
            {
                View.levelUpRewardTemplate.gameObject.SetActive(false);
            }

            int count = _context.Props?.Count ?? 0;
            EnsureRewardItemCount(count);

            for (int i = 0; i < _rewardItems.Count; i++)
            {
                LevelUpRewardItem item = _rewardItems[i];
                if (i < count)
                {
                    item.Init(_context.Props[i]);
                    item.gameObject.SetActive(true);
                }
                else
                {
                    item.gameObject.SetActive(false);
                }
            }

            // 刷新 -20 <sprite name="coin" index=0>
            View.refreshCostFormatText.Set(context.RefreshPrice);
        }

        #region Lifecycle

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

            if (userData is not LevelUpContext context)
            {
                Log.Error("LevelUpForm requires LevelUpContext as userData.");
                return;
            }

            RefreshUI(context);
        }

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

        #endregion

        private void EnsureButtonListeners()
        {
            if (_listenersBound)
            {
                return;
            }

            _listenersBound = true;

            View.refreshButton.onClick.AddListener(OnRefreshButtonClick);
        }

        private void EnsureRewardItemCount(int count)
        {
            while (_rewardItems.Count < count)
            {
                int index = _rewardItems.Count;
                LevelUpRewardItem item = Instantiate(View.levelUpRewardTemplate, View.rewardAreaRoot);
                CommonButton button = item.GetComponentInChildren<CommonButton>();
                if (button != null)
                {
                    button.onClick.AddListener(() => OnSelectButtonClick(index));
                }

                _rewardItems.Add(item);
            }
        }

        public void OnSelectButtonClick(int index)
        {
            GameEntry.Event.Fire(this, LevelUpPropSelectedEventArgs.Create(index));
        }

        public void OnRefreshButtonClick()
        {
            GameEntry.Event.Fire(this, LevelUpRefreshEventArgs.Create(_context.RefreshPrice));
        }
    }
}