using System.Text;

namespace ElectricLocomotive;

public class LocosGenericStorage    
{
    readonly Dictionary<LocomotivCollectionInfo, LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv>> _electricLocoStorages;
    public List<LocomotivCollectionInfo> Keys => _electricLocoStorages.Keys.ToList();

    private readonly int _pictureWidth;

    private readonly int _pictureHeight;
    private static readonly char _separatorForKeyValue = '|';

    private readonly char _separatorRecords = ';';

    private static readonly char _separatorForObject = ':';

    public LocosGenericStorage(int pictureWidth, int pictureHeight)
    {
        _electricLocoStorages = new Dictionary<LocomotivCollectionInfo, 
            LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv>>();
        _pictureWidth = pictureWidth;
        _pictureHeight = pictureHeight;
    }

    public void AddSet(string name)
    {
        _electricLocoStorages.Add(new LocomotivCollectionInfo(name, string.Empty), new LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv> (_pictureWidth, _pictureHeight));
    }

    public void DelSet(string name)
    {
        if (!_electricLocoStorages.ContainsKey(new LocomotivCollectionInfo(name, string.Empty)))
            return;
        _electricLocoStorages.Remove(new LocomotivCollectionInfo(name, string.Empty));
    }
    
    public LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv>? this[string ind]
    {
        get
        {
            LocomotivCollectionInfo indObj = new LocomotivCollectionInfo(ind, string.Empty);
            if (_electricLocoStorages.ContainsKey(indObj))
                return _electricLocoStorages[indObj];
            return null;
        }
    }
    public bool SaveData(string filename)
    {
        if (File.Exists(filename))
        {
            File.Delete(filename);
        }
        StringBuilder data = new();
        foreach (KeyValuePair<LocomotivCollectionInfo,
                     LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv>> record in _electricLocoStorages)
        {
            StringBuilder records = new();
            foreach (DrawingLocomotiv? elem in record.Value.GetLocos)
            {
                records.Append($"{elem?.GetDataForSave(_separatorForObject)}{_separatorRecords}");
            }
            data.AppendLine($"{record.Key}{_separatorForKeyValue}{records}");
        }

        if (data.Length == 0)
        {
            throw new Exception("Невалиданя операция, нет данных длясохранения");
        }
        string toWrite = $"LocoStorage{Environment.NewLine}{data}";
        var strs = toWrite.Split(new char[] { '\n', '\r' },
            StringSplitOptions.RemoveEmptyEntries);

        using (StreamWriter sw = new(filename))
        {
            foreach (var str in strs)
            {
                sw.WriteLine(str);
            }
        }
        return true;
    }
    public bool LoadData(string filename)
    {
        if (!File.Exists(filename))
        {
            throw new Exception("Файл не найден");
        }
        using (StreamReader sr = new(filename))
        {
            string str = sr.ReadLine();
            var strs = str.Split(new char[] { '\n', '\r' },
                StringSplitOptions.RemoveEmptyEntries);
            if (strs == null || strs.Length == 0)
            {
                throw new Exception("Нет данных для загрузки");
            }
            if (!strs[0].StartsWith("LocoStorage"))
            {
                throw new Exception("Неверный формат данных");
            }
            _electricLocoStorages.Clear();
            do
            {
                string[] record = str.Split(_separatorForKeyValue,
                    StringSplitOptions.RemoveEmptyEntries);
                if (record.Length != 2)
                {
                    str = sr.ReadLine();
                    continue;
                }
                LocosGenericCollection<DrawingLocomotiv, DrawingObjectLocomotiv>
                    collection = new(_pictureWidth, _pictureHeight);
                string[] set = record[1].Split(_separatorRecords,
                    StringSplitOptions.RemoveEmptyEntries);
                foreach (string elem in set)
                {
                    DrawingLocomotiv? monorail =
                        elem?.CreateDrawingLoco(_separatorForObject, _pictureWidth, _pictureHeight);
                    if (monorail != null)
                    {
                        if (!(collection + monorail))
                        {
                            throw new Exception("Ошибка добавления в коллекцию");
                        }
                    }
                }
                _electricLocoStorages.Add(new LocomotivCollectionInfo(record[0], string.Empty), collection);

                str = sr.ReadLine();
            } while (str != null);
            
        }
        return true;
    }
    
}