PIbd-14_Rachek_A.S._Base/lab_0/CollectionGenericObject/StorageCollection.cs

using ProjectBus.Drawnings;
using ProjectBus.Exceptions;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ProjectBus.CollectionGenericObject;

/// <summary>
/// Класс-хранилище коллекций
/// </summary>
/// <typeparam name="T"></typeparam>

public class StorageCollection<T>
    where T : DrawningSimpleBus
{

    readonly Dictionary<CollectionInfo, ICollectionGenericObjects<T>> _storages;


    public List<CollectionInfo> Keys => _storages.Keys.ToList();

    public StorageCollection()
    {
        _storages = new Dictionary<CollectionInfo, ICollectionGenericObjects<T>>();
    }
    public void AddCollection(CollectionInfo collectionInfo)
    {
        if (_storages.ContainsKey(collectionInfo)) throw new CollectionAlreadyExistsException(collectionInfo);
        if (collectionInfo.CollectionType == CollectionType.None)
            throw new CollectionTypeException("Пустой тип коллекции");
        if (collectionInfo.CollectionType == CollectionType.Massive)
            _storages[collectionInfo] = new MassiveGenericObjects<T>();
        else if (collectionInfo.CollectionType == CollectionType.List)
            _storages[collectionInfo] = new ListGenericObjects<T>();
    }
    public void DelCollection(CollectionInfo collectionInfo)
    {
        if (_storages.ContainsKey(collectionInfo))
            _storages.Remove(collectionInfo);
    }

    public ICollectionGenericObjects<T>? this[CollectionInfo collectionInfo]
    {
        get
        {
            if (_storages.ContainsKey(collectionInfo))
                return _storages[collectionInfo];
            return null;
        }
    }
    private readonly string _collectionKey = "CollectionsStorage";
    /// <summary>
    /// Разделитель для записи ключа и значения элемента словаря
    /// </summary>
    private readonly string _separatorForKeyValue = "|";
    /// <summary>
    /// Разделитель для записей коллекции данных в файл
    /// </summary>
    private readonly string _separatorItems = ";";
    public bool SaveData(string filename)
    {
        if (_storages.Count == 0)
        {
            throw new EmptyFileExeption();
        }

        if (File.Exists(filename))
        {
            File.Delete(filename);
        }

        using (StreamWriter writer = new StreamWriter(filename))
        {
            writer.Write(_collectionKey);
            foreach (KeyValuePair<CollectionInfo, ICollectionGenericObjects<T>> value in _storages)
            {
                StringBuilder sb = new();
                sb.Append(Environment.NewLine);

                // не сохраняем пустые коллекции
                if (value.Value.Count == 0)
                {
                    continue;
                }

                sb.Append(value.Key);
                sb.Append(_separatorForKeyValue);
                sb.Append(value.Value.GetCollectionType);
                sb.Append(_separatorForKeyValue);
                sb.Append(value.Value.MaxCount);
                sb.Append(_separatorForKeyValue);
                foreach (T? item in value.Value.GetItems())
                {
                    string data = item?.GetDataForSave() ?? string.Empty;
                    if (string.IsNullOrEmpty(data))
                    {
                        continue;
                    }
                    sb.Append(data);
                    sb.Append(_separatorItems);
                }
                writer.Write(sb);
            }

        }
        return true;

    }

    /// <summary>
    /// Загрузка информации по автомобилям в хранилище из файла
    /// </summary>
    /// <param name="filename">Путь и имя файла</param>
    /// <returns>true - загрузка прошла успешно, false - ошибка при загрузке данных</returns>
    public void LoadData(string filename)
    {
        if (!File.Exists(filename))
        {
            throw new FileNotFoundException(filename);
        }

        using (StreamReader fs = File.OpenText(filename))
        {
            string str = fs.ReadLine();
            if (string.IsNullOrEmpty(str))
            {
                throw new EmptyFileExeption(filename);
            }

            if (!str.StartsWith(_collectionKey))
            {
                throw new FileFormatException(filename);
            }

            _storages.Clear();
            string strs = "";
            while ((strs = fs.ReadLine()) != null)
            {
                string[] record = strs.Split(_separatorForKeyValue, StringSplitOptions.RemoveEmptyEntries);
                if (record.Length != 3)
                {
                    continue;
                }

                CollectionInfo? collectionInfo =
                    CollectionInfo.GetCollectionInfo(record[0]) ??
                    throw new CollectionInfoException("Не удалось определить информацию коллекции:" + record[0]);

                ICollectionGenericObjects<T>? collection =
                    StorageCollection<T>.CreateCollection(collectionInfo.CollectionType) ??
                    throw new CollectionTypeException("Не удалось определить тип коллекции:" + record[1]);
                collection.MaxCount = Convert.ToInt32(record[1]);

                string[] set = record[2].Split(_separatorItems, StringSplitOptions.RemoveEmptyEntries);
                foreach (string elem in set)
                {
                    if (elem?.CreateDrawningSimpleBus() is T ship)
                    {
                        try
                        {
                            collection.Insert(ship);
                        }
                        catch (Exception ex)
                        {
                            throw new FileFormatException(filename, ex);
                        }
                    }
                }

                _storages.Add(collectionInfo, collection);
            }
        }
    }
    private static ICollectionGenericObjects<T>? CreateCollection(CollectionType collectionType)
    {
        return collectionType switch
        {
            CollectionType.Massive => new MassiveGenericObjects<T>(),
            CollectionType.List => new ListGenericObjects<T>(),
            _ => null,
        };
    }
}