using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace lab1.CollectionGenericObjects;
/// <summary>
/// Класс-хранилище коллекций
/// </summary>
/// <typeparam name="T"></typeparam>
public class StorageCollection<T>
    where T : class
{
    /// <summary>
    /// Словарь (хранилище) с коллекциями
    /// </summary>
    readonly Dictionary<string, ICollectionGenericObjects<T>> _storages;

    /// <summary>
    /// Возвращение списка названий коллекций
    /// </summary>
    public List<string> Keys => _storages.Keys.ToList();

    /// <summary>
    /// Конструктор
    /// </summary>
    public StorageCollection()
    {
        _storages = new Dictionary<string, ICollectionGenericObjects<T>>();
    }

    /// <summary>
    /// Добавление коллекции в хранилище
    /// </summary>
    /// <param name="name">Название коллекции</param>
    /// <param name="collectionType">тип коллекции</param>
    public void AddCollection(string name, CollectionType collectionType)
    {

        if (_storages.ContainsKey(name)) return;
        if (collectionType == CollectionType.None) return;
        else if (collectionType == CollectionType.Massive)
            _storages[name] = new MassiveGenericObjects<T>();
        else if (collectionType == CollectionType.List)
            _storages[name] = new ListGenericObjects<T>();
    }

    /// <summary>
    /// Удаление коллекции
    /// </summary>
    /// <param name="name">Название коллекции</param>
    public void DelCollection(string name)
    {
        if (_storages.ContainsKey(name))
            _storages.Remove(name);
    }

    /// <summary>
    /// Доступ к коллекции
    /// </summary>
    /// <param name="name">Название коллекции</param>
    /// <returns></returns>
    public ICollectionGenericObjects<T>? this[string name]
    {
        get
        {
            if (_storages.ContainsKey(name))
                return _storages[name];
            return null;
        }
    }
}