using System;
using System.Collections.Generic;
using System.Diagnostics.Tracing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Artilleries
{
    internal class MapsCollection
    {
        readonly Dictionary<string, MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>> _mapsStorage;
        public List<string> Keys => _mapsStorage.Keys.ToList();

        private readonly int _pictureWidth;
        private readonly int _pictureHeight;

        private readonly char separatorDict = '|';
        private readonly char separatorData = ';';

        public MapsCollection(int pictureWidth, int pictureHeight)
        {
            _mapsStorage = new Dictionary<string, MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>>();
            _pictureWidth = pictureWidth;
            _pictureHeight = pictureHeight;
        }

        public void AddMap(string name, AbstractMap map)
        {
            if (!_mapsStorage.ContainsKey(name))
            {
                _mapsStorage.Add(name, new MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>(_pictureWidth, _pictureHeight, map));
            }
        }

        public void DelMap(string name)
        {
            if (_mapsStorage.ContainsKey(name))
            {
                _mapsStorage.Remove(name);
            }
        }

        public MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap> this[string index]
        {
            get
            {
                return _mapsStorage.ContainsKey(index) ? _mapsStorage[index] : null;
            }
        }

        public bool SaveData(string filename)
        {
            if (File.Exists(filename))
            {
                File.Delete(filename);
            }

            using (FileStream fs = new FileStream(filename, FileMode.Create))
            using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
            {
                sw.WriteLine("MapsCollection");
                foreach (var storage in _mapsStorage)
                {
                    sw.WriteLine($"{storage.Key}{separatorDict}{storage.Value.GetData(separatorDict, separatorData)}");
                }
            }

            return true;
        }

        public bool LoadData(string filename)
        {
            if (!File.Exists(filename))
            {
                return false;
            }

            using (FileStream fs = new FileStream(filename, FileMode.Open))
            using (StreamReader sr = new StreamReader(fs, Encoding.UTF8))
            {
                string current_line = sr.ReadLine();

                if (current_line == null || !current_line.Contains("MapsCollection"))
                {
                    return false;
                }

                _mapsStorage.Clear();
                while ((current_line = sr.ReadLine()) != null)
                {
                    var elements = current_line.Split(separatorDict);
                    AbstractMap map = null;

                    switch (elements[1])
                    {
                        case "SimpleMap":
                            map = new SimpleMap();
                            break;
                        case "ForestMap":
                            map = new ForestMap();
                            break;
                    }

                    _mapsStorage.Add(elements[0], new MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>(_pictureWidth, _pictureHeight, map));
                    _mapsStorage[elements[0]].LoadData(elements[2].Split(separatorData, StringSplitOptions.RemoveEmptyEntries));
                }

                return true;
            }
        }
    }
}