using System;
using UnityEngine;

namespace ZXLA
{
    class FileSystemUIDisplay : MonoBehaviour
    {
        [SerializeField]
        private UnityEngine.UI.ScrollRect _scrollRect;

        [SerializeField]
        private FileSystemItem _itemPrefab;

        private FileSystem _fileSystem;

        void Start()
        {
            _fileSystem = GameObject.FindObjectOfType<FileSystem>();
            _fileSystem.OnFileSystemChanged += OnRepaint;
        }

        private void OnRepaint(FileSystemOperation obj)
        {
            if (!_itemPrefab)
                throw new NullReferenceException("_itemPrefab is null");
            var contentTransform = _scrollRect.content.transform;
            var componentsInChildren = contentTransform.GetComponentsInChildren<FileSystemItem>();
            foreach (var componentsInChild in componentsInChildren)
            {
                GameObject.Destroy(componentsInChild.gameObject);
            }

            var readOnlyDictionary = _fileSystem.GetAllObjects();
            foreach (var kv in readOnlyDictionary)
            {
                if (!kv.Value.isDisplay)
                    continue;
                var fileSystemItem = GameObject.Instantiate(_itemPrefab,contentTransform);
                fileSystemItem.SetObject(kv.Value);
            }
        }
    }
}