using GeometryTD.CustomEvent;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace GeometryTD.UI
{
    public class GoodsItem : 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 _tagsParent;

        [SerializeField] private TMP_Text _purchaseButtonText;
        
        [SerializeField] private GameObject _tagItemPrefab;

        [SerializeField] private int _index;

        private GoodsItemContext _context;

        public void OnInit(GoodsItemContext context)
        {
            _context = context;
            _index = context?.GoodsIndex ?? -1;

            _iconArea?.OnInit(context?.IconAreaContext ?? new IconAreaContext());

            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();

            if (_purchaseButtonText != null)
            {
                _purchaseButtonText.text = context?.PurchaseButtonText ?? string.Empty;
            }

            RefreshTags(context?.TagTexts);
        }

        public void OnReset()
        {
            _context = null;
            _index = -1;
            _iconArea?.OnReset();

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

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

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

            ResetDescriptionScroll();

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

            ClearTags();
        }
        
        public void OnPurchaseButtonClick()
        {
            if (_context == null || !_context.CanPurchase || _index < 0)
            {
                return;
            }

            GameEntry.Event.Fire(this, ShopPurchaseRequestedEventArgs.Create(_index));
        }

        private void RefreshTags(string[] tagTexts)
        {
            ClearTags();
            if (_tagsParent == null || _tagItemPrefab == null || tagTexts == null)
            {
                return;
            }

            for (int i = 0; i < tagTexts.Length; i++)
            {
                if (string.IsNullOrEmpty(tagTexts[i]))
                {
                    continue;
                }

                GameObject tagItemObject = Instantiate(_tagItemPrefab, _tagsParent);
                TagItem tagItem = tagItemObject.GetComponent<TagItem>();
                if (tagItem != null)
                {
                    tagItem.OnInit(new TagItemContext
                    {
                        TagName = tagTexts[i]
                    });
                }
            }
        }

        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 void ClearTags()
        {
            if (_tagsParent == null)
            {
                return;
            }

            for (int i = _tagsParent.childCount - 1; i >= 0; i--)
            {
                Destroy(_tagsParent.GetChild(i).gameObject);
            }
        }
    }
}