geometry-tower-defense/Assets/GameMain/Scripts/UI/General/View/RewardItem.cs

using System.Collections.Generic;
using GeometryTD.CustomEvent;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace GeometryTD.UI
{
    public class RewardItem : MonoBehaviour
    {
        [SerializeField] private IconArea _iconArea;
        
        [SerializeField] private TMP_Text _titleText;
        
        [SerializeField] private TMP_Text _typeText;
        
        [SerializeField] private TMP_Text _descriptionText;

        [SerializeField] private RectTransform _descriptionScrollView;

        [SerializeField] private RectTransform _descriptionContent;

        [SerializeField] private float _maxDescriptionViewportHeight = 0f;

        [SerializeField] private Transform _tagItemParent;
        
        [SerializeField] private TagItem _tagItemTemplate;

        private readonly List<TagItem> _runtimeTagItems = new List<TagItem>();
        
        private RewardItemContext _context;
        

        public void OnInit(RewardItemContext context)
        {
            if (context == null)
            {
                OnReset();
                gameObject.SetActive(false);
                return;
            }

            _context = context;
            gameObject.SetActive(true);

            if (_iconArea != null)
            {
                if (context.IconArea != null)
                {
                    _iconArea.OnInit(context.IconArea);
                }
                else
                {
                    _iconArea.OnReset();
                }
            }

            if (_titleText != null)
            {
                _titleText.text = context.Title ?? string.Empty;
            }

            if (_typeText != null)
            {
                _typeText.text = context.TypeText ?? string.Empty;
            }

            if (_descriptionText != null)
            {
                _descriptionText.text = context.Description ?? string.Empty;
            }

            ResizeDescriptionArea();

            RefreshTags(context.Tags);
        }

        public void OnReset()
        {
            _context = null;

            if (_iconArea != null)
            {
                _iconArea.OnReset();
            }

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

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

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

            ResetDescriptionScroll();

            ClearTags();
        }

        public void OnClick()
        {
            if (_context == null)
            {
                return;
            }

            GameEntry.Event.Fire(this, RewardSelectItemSelectedEventArgs.Create(_context.Index));
        }

        private void RefreshTags(TagItemContext[] tagContexts)
        {
            ClearTags();

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

            TagItem template = ResolveTagTemplate();
            if (template == null)
            {
                return;
            }

            for (int i = 0; i < tagContexts.Length; i++)
            {
                TagItemContext tagContext = tagContexts[i];
                if (tagContext == null || string.IsNullOrWhiteSpace(tagContext.TagName))
                {
                    continue;
                }

                TagItem tagItem = Instantiate(template, _tagItemParent);
                tagItem.gameObject.SetActive(true);
                tagItem.OnInit(tagContext);
                _runtimeTagItems.Add(tagItem);
            }
        }

        private void ResizeDescriptionArea()
        {
            if (_descriptionText == null)
            {
                return;
            }

            _descriptionText.ForceMeshUpdate();
            float descriptionHeight = Mathf.Max(0f, _descriptionText.preferredHeight);
            SetRectHeight(_descriptionText.rectTransform, descriptionHeight);

            if (_descriptionContent != null)
            {
                SetRectHeight(_descriptionContent, descriptionHeight);
            }

            if (_descriptionScrollView != null)
            {
                float viewportHeight = _maxDescriptionViewportHeight > 0f
                    ? Mathf.Min(descriptionHeight, _maxDescriptionViewportHeight)
                    : descriptionHeight;
                SetRectHeight(_descriptionScrollView, viewportHeight);
            }

            ResetDescriptionScroll();
        }

        private void ResetDescriptionScroll()
        {
            if (_descriptionScrollView != null &&
                _descriptionScrollView.TryGetComponent(out ScrollRect scrollRect))
            {
                scrollRect.verticalNormalizedPosition = 1f;
            }
        }

        private static void SetRectHeight(RectTransform rectTransform, float height)
        {
            if (rectTransform == null)
            {
                return;
            }

            Vector2 size = rectTransform.sizeDelta;
            size.y = height;
            rectTransform.sizeDelta = size;
        }

        private TagItem ResolveTagTemplate()
        {
            if (_tagItemTemplate != null)
            {
                return _tagItemTemplate;
            }

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

            _tagItemTemplate = _tagItemParent.GetComponentInChildren<TagItem>(true);
            if (_tagItemTemplate != null)
            {
                _tagItemTemplate.gameObject.SetActive(false);
            }

            return _tagItemTemplate;
        }

        private void ClearTags()
        {
            for (int i = _runtimeTagItems.Count - 1; i >= 0; i--)
            {
                TagItem tagItem = _runtimeTagItems[i];
                if (tagItem != null)
                {
                    Destroy(tagItem.gameObject);
                }
            }

            _runtimeTagItems.Clear();
        }
    }
}