using Lab.DrawningObjects;
using Lab.MovementStrategy;
using Lab.Generics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Lab.Generics
{
    internal class CarsGenericStorage
    {
        readonly Dictionary<string, CarsGenericCollection<DrawTanker, DrawingObjectTanker>> _carStorages;
        public List<string> Keys => _carStorages.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 CarsGenericStorage(int pictureWidth, int pictureHeight)
        {
            _carStorages = new Dictionary<string, CarsGenericCollection<DrawTanker, DrawingObjectTanker>>();
            _pictureWidth = pictureWidth;
            _pictureHeight = pictureHeight;
        }
        public void AddSet(string name)
        {
            if (_carStorages.ContainsKey(name)) return;
            _carStorages[name] = new CarsGenericCollection<DrawTanker, DrawingObjectTanker>(_pictureWidth, _pictureHeight);
        }

        public void DelSet(string name)
        {
            if (!_carStorages.ContainsKey(name)) return;
            _carStorages.Remove(name);
        }

        public CarsGenericCollection<DrawTanker, DrawingObjectTanker>?
        this[string ind]
        {
            get
            {
                if (_carStorages.ContainsKey(ind)) return _carStorages[ind];
                return null;
            }
        }
        public void SaveData(string filename)
        {
            if (File.Exists(filename))
            {
                File.Delete(filename);
            }
            StringBuilder data = new();
            foreach (KeyValuePair<string, CarsGenericCollection<DrawTanker, DrawingObjectTanker>> record in _carStorages)
            {
                StringBuilder records = new();
                foreach (DrawTanker? elem in record.Value.GetCars)
                {
                    records.Append($"{elem?.GetDataForSave(_separatorForObject)}{_separatorRecords}");
                }
                data.AppendLine($"{record.Key}{_separatorForKeyValue}{records}");
                
            }
            if (data.Length == 0)
            {
                throw new Exception("Невалидная операция, нет данных для сохранения");
            }
            using (StreamWriter writer = new StreamWriter(filename))
            {
                writer.WriteLine("CarStorage");
                writer.Write(data.ToString());
            }
            
        }

        public void LoadData(string filename)
        {
            if (!File.Exists(filename))
            {
                throw new Exception("Файл не найден");
            }
            using (StreamReader reader = new StreamReader(filename))
            {
                string checker = reader.ReadLine();
                if (checker == null)
                    throw new Exception("Нет данных для загрузки");
                if (!checker.StartsWith("CarStorage"))
                    throw new Exception("Неверный формат ввода");
                _carStorages.Clear();
                string strs;
                bool firstinit = true;
                while ((strs = reader.ReadLine()) != null)
                {
                    if (strs == null && firstinit)
                        throw new Exception("Нет данных для загрузки");
                    if (strs == null )
                        break;
                    firstinit = false;
                    string name = strs.Split('|')[0];
                    CarsGenericCollection<DrawTanker, DrawingObjectTanker> collection = new(_pictureWidth, _pictureHeight);
                    foreach (string data in strs.Split('|')[1].Split(';'))
                    {                
                        DrawTanker? car =
                        data?.CreateDrawTanker(_separatorForObject, _pictureWidth, _pictureHeight);
                        if (car != null)
                        {
                            try {_ = collection + car; }
                            catch (CarNotFoundException e)
                            {
                                throw e;
                            }
                            catch (StorageOverflowException e)
                            {
                                throw e;
                            }
                        }                       
                    }
                    _carStorages.Add(name, collection);
                }
            }
        }

    }
}