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 bool 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)
            {
                return false;
            }
            using FileStream fs = new(filename, FileMode.Create);
            byte[] info = new
            UTF8Encoding(true).GetBytes($"CarStorage{Environment.NewLine}{data}");
            fs.Write(info, 0, info.Length);
            return true;
        }

        public bool LoadData(string filename)
        {
            if (!File.Exists(filename))
            {
                return false;
            }
            string bufferTextFromFile = "";
            using (FileStream fs = new(filename, FileMode.Open))
            {
                byte[] b = new byte[fs.Length];
                UTF8Encoding temp = new(true);
                while (fs.Read(b, 0, b.Length) > 0)
                {
                    bufferTextFromFile += temp.GetString(b);
                }
            }
            var strs = bufferTextFromFile.Split(new char[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);
            if (strs == null || strs.Length == 0)
            {
                return false;
            }
            if (!strs[0].StartsWith("CarStorage"))
            {
                return false;
            }
            _carStorages.Clear();
            foreach (string data in strs)
            {
                string[] record = data.Split(_separatorForKeyValue, StringSplitOptions.RemoveEmptyEntries);
                if (record.Length != 2)
                {
                    continue;
                }
                CarsGenericCollection<DrawTanker, DrawingObjectTanker> collection = new(_pictureWidth, _pictureHeight);
                string[] set = record[1].Split(_separatorRecords, StringSplitOptions.RemoveEmptyEntries);
                foreach (string elem in set)
                {
                    DrawTanker? car =
                    elem?.CreateDrawTanker(_separatorForObject, _pictureWidth, _pictureHeight);
                    if (car != null)
                    {
                        if (!(collection + car))
                        {
                            return false;
                        }
                    }
                }
                _carStorages.Add(record[0], collection);
            }
            return true;
        }


    }
}