using System.Collections.Generic;
using EnhancedUI.EnhancedScroller;
using TMPro;
using UI.PartnerGather.ScrollItems;
using UnityEngine;
using UnityEngine.UI;
using ScrollViewItemInfo = EventPartnerScrollViewItem.ScrollViewItemInfo;

public class EventPartnerScrollViewTitle : EnhancedScrollerCellView
{
    public TMP_Text textTitle;
    [SerializeField] private RectTransform itemContainer;
    [SerializeField] private EventPartnerGatherScrollViewItem itemPrefab;

    private readonly List<EventPartnerGatherScrollViewItem> _itemViews = new();

    /// <param name="itemHeight">单行 Item 高度，须与邀请面板 jiandaItemHeight 一致。</param>
    /// <param name="itemSpacing">行间距，须与邀请面板 sectionItemSpacing 及 GetCellViewSize 中 Section 高度公式一致。</param>
    public void Init(ScrollViewItemInfo sectionInfo, float itemHeight, float itemSpacing = 0f)
    {
        textTitle.text = sectionInfo.Title;

        var items = sectionInfo.SectionItems;
        var count = items?.Count ?? 0;

        while (_itemViews.Count < count)
        {
            var item = Instantiate(itemPrefab, itemContainer);
            var rt = item.transform as RectTransform;
            rt.anchorMin = new Vector2(0, 1);
            rt.anchorMax = new Vector2(1, 1);
            rt.pivot = new Vector2(0.5f, 1);
            _itemViews.Add(item);
        }

        var stride = itemHeight + itemSpacing;
        for (var i = 0; i < _itemViews.Count; i++)
        {
            if (i < count)
            {
                _itemViews[i].gameObject.SetActive(true);
                _itemViews[i].Init(items[i]);
                var rt = _itemViews[i].transform as RectTransform;
                rt.anchoredPosition = new Vector2(0, -i * stride);
                rt.sizeDelta = new Vector2(0, itemHeight);
            }
            else
            {
                _itemViews[i].gameObject.SetActive(false);
            }
        }

        if (itemContainer != null)
        {
            var contentH = count <= 0 ? 0f : count * itemHeight + (count - 1) * itemSpacing;
            var w = itemContainer.sizeDelta.x;
            itemContainer.sizeDelta = new Vector2(w, contentH);
            LayoutRebuilder.ForceRebuildLayoutImmediate(itemContainer);
        }
    }
}