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

namespace ContainerShip.Generic
{
    internal class ShipsGenericCollection<T, U>
    where T : DrawningShip
    where U : IMoveableObject
    {
        private readonly int _pictureWidth;
        private readonly int _pictureHeight;
        private readonly int _placeSizeWidth = 210;
        private readonly int _placeSizeHeight = 90;
        private readonly SetGeneric<T> _collection;
        public ShipsGenericCollection(int picWidth, int picHeight)
        {
            int width = picWidth / _placeSizeWidth;
            int height = picHeight / _placeSizeHeight;
            _pictureWidth = picWidth;
            _pictureHeight = picHeight;
            _collection = new SetGeneric<T>(width * height);
        }
        public static int operator +(ShipsGenericCollection<T, U> collect, T? obj)
        {
            if (obj != null)
            {
                return collect._collection.Insert(obj);
            }
            return -1;
        }
        public static bool operator -(ShipsGenericCollection<T, U> collect, int pos)
        {
            if (collect._collection[pos] == null)
            {
                return false;
            }
            return collect?._collection.Remove(pos) ?? false;
        }
        public U? GetU(int pos)
        {
            return (U?)_collection[pos]?.GetMoveableObject;
        }
        public Bitmap ShowShips()
        {
            Bitmap bmp = new(_pictureWidth, _pictureHeight);
            Graphics gr = Graphics.FromImage(bmp);
            DrawBackground(gr);
            DrawObjects(gr);
            return bmp;
        }
        private void DrawBackground(Graphics g)
        {
            Pen pen = new(Color.Black, 3);
            for (int i = 0; i < _pictureWidth / _placeSizeWidth; i++)
            {
                for (int j = 0; j < _pictureHeight / _placeSizeHeight +
                1; ++j)
                {
                    g.DrawLine(pen, i * _placeSizeWidth, j *
                    _placeSizeHeight, i * _placeSizeWidth + _placeSizeWidth / 2, j *
                    _placeSizeHeight);
                }
                g.DrawLine(pen, i * _placeSizeWidth, 0, i *
                _placeSizeWidth, _pictureHeight / _placeSizeHeight * _placeSizeHeight);
            }
        }
        private void DrawObjects(Graphics g)
        {
            int x = _pictureWidth / _placeSizeWidth - 1;
            int y = _pictureHeight / _placeSizeHeight - 1;

            for (int i = 0; i < _collection.Count; i++)
            {
                DrawningShip _ship = _collection[i];
                if (_ship != null) {
                    if (x < 0)
                    {
                        x = _pictureWidth / _placeSizeWidth - 1;
                        y--;
                    }
                    _ship.SetPosition(_placeSizeWidth * x, _placeSizeHeight * y);
                    _ship.DrawTransport(g);
                    x--;
                }
            }
        }
    }

}