using AirBomber.MovementStrategy;
using AirBomber.Rendering;
using System.Text;

namespace AirBomber.Generics
{
    internal class EntitiesGenericStorage
    {
        readonly Dictionary<string, EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer>> _entityStorages;

        public List<string> Keys => _entityStorages.Keys.ToList();

        private readonly int _pictureWidth;
        private readonly int _pictureHeight;

        private readonly char _keyValueDelimiter = '|';
        private readonly char _recordsDelimiter = ';';
        private readonly char _entityDelimiter = ':';

        public EntitiesGenericStorage(int PictureWidth, int PictureHeight)
        {
            _entityStorages = new Dictionary<string, EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer>>();

            _pictureWidth = PictureWidth;
            _pictureHeight = PictureHeight;
        }

        public void AddSet(string Name)
        {
            var NewCollection =
                new EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer>(_pictureWidth, _pictureHeight);

            if (Keys.Contains(Name))
            {
                MessageBox.Show("Набор с таким именем уже существует", "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            _entityStorages.Add(Name, NewCollection);
        }

        public void RemoveSet(string Name)
        {
            _entityStorages.Remove(Name);
        }

        public EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer>? this[string Index]
        {
            get
            {
                if (!_entityStorages.ContainsKey(Index))
                    return null;

                return _entityStorages[Index];
            }
        }

        public void SaveData(string FileName)
        {
            if (_entityStorages.Count == 0)
                throw new Exception("Невалидная операция: нет данных для сохранения");

            using (StreamWriter writer = new StreamWriter(FileName, false))
            {
                writer.WriteLine("BomberStorage");

                foreach (KeyValuePair<string, EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer>> Record in _entityStorages)
                {
                    StringBuilder Records = new StringBuilder();

                    foreach (BomberRendererBase? Element in Record.Value.Entities)
                        Records.Append($"{Element?.SerializeRenderer(_entityDelimiter)}{_recordsDelimiter}");

                    writer.WriteLine($"{Record.Key}{_keyValueDelimiter}{Records}");
                }
            }
        }

        public void LoadData(string FileName)
        {
            if (!File.Exists(FileName))
                throw new Exception("Файл не найден");

            using (StreamReader reader = new StreamReader(FileName))
            {
                if (reader.ReadLine() != "BomberStorage")
                    throw new Exception("Неверный формат данных");

                _entityStorages.Clear();

                string? Data;
                while ((Data = reader.ReadLine()) != null)
                {
                    string[] Record = Data.Split(_keyValueDelimiter, StringSplitOptions.RemoveEmptyEntries);

                    if (Record.Length != 2)
                        continue;

                    EntitiesGenericCollection<BomberRendererBase, ObjectEntityRenderer> Collection = new(_pictureWidth, _pictureHeight);
                    string[] Set = Record[1].Split(_recordsDelimiter, StringSplitOptions.RemoveEmptyEntries);

                    foreach (string Element in Set)
                    {
                        BomberRendererBase? Renderer = Element?.DeserializeRenderer(_entityDelimiter, _pictureWidth, _pictureHeight);

                        if (Renderer != null)
                        {
                            if ((Collection + Renderer) == -1)
                                throw new Exception("Ошибка добавления в коллекцию");
                        }
                    }

                    _entityStorages.Add(Record[0], Collection);
                }
            }
        }
    }
}