using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.VisualBasic;
using WarmlyShip.DrawningObjects;
using WarmlyShip.MovementStrategy;

namespace WarmlyShip.Generics
{
    /// <summary>
    /// Параметризованный класс для набора объектов DrawningShip
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <typeparam name="U"></typeparam>
    internal class ShipsGenericCollection<T, U>
        where T : DrawningShip
        where U : IMoveableObject
    {
        /// <summary>
        /// Получение объектов коллекции
        /// </summary>
        public IEnumerable<T?> GetShips => _collection.GetShips();

        /// <summary>
        /// Ширина окна прорисовки
        /// </summary>
        private readonly int _pictureWidth;

        /// <summary>
        /// Высота окна прорисовки
        /// </summary>
        private readonly int _pictureHeight;

        /// <summary>
        /// Размер занимаемого объектом места (ширина)
        /// </summary>
        private readonly int _placeSizeWidth = 210;

        /// <summary>
        /// Размер занимаемого объектом места (высота)
        /// </summary>
        private readonly int _placeSizeHeight = 90;

        /// <summary>
        /// Набор объектов
        /// </summary>
        private readonly SetGeneric<T> _collection;

        /// <summary>
        /// Конструктор
        /// </summary>
        /// <param name="picWidth"></param>
        /// <param name="picHeight"></param>
        public ShipsGenericCollection(int picWidth, int picHeight)
        {
            int width = picWidth / _placeSizeWidth;
            int height = picHeight / _placeSizeHeight;
            _pictureWidth = picWidth;
            _pictureHeight = picHeight;
            _collection = new SetGeneric<T>(width * height);
        }

        /// <summary>
        /// Перегрузка оператора сложения
        /// </summary>
        /// <param name="collect"></param>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static bool operator +(ShipsGenericCollection<T, U> collect, T? obj)
        {
            if (obj == null || collect == null)
            {
                return false;
            }
            collect?._collection.Insert(obj);
            return true;
        }

        /// <summary>
        /// Перегрузка оператора вычитания
        /// </summary>
        /// <param name="collect"></param>
        /// <param name="pos"></param>
        /// <returns></returns>
        public static T? operator -(ShipsGenericCollection<T, U> collect, int pos)
        {
            T? obj = collect._collection[pos];
            collect._collection.Remove(pos);
            return obj;
        }

        /// <summary>
        /// Получение объекта IMoveableObject
        /// </summary>
        /// <param name="pos"></param>
        /// <returns></returns>
        public U? GetU(int pos)
        {
            return (U?)_collection[pos]?.GetMoveableObject;
        }

        /// <summary>
        /// Вывод всего набора объектов
        /// </summary>
        /// <returns></returns>
        public Bitmap ShowShips()
        {
            Bitmap bmp = new(_pictureWidth, _pictureHeight);
            Graphics gr = Graphics.FromImage(bmp);
            DrawBackground(gr);
            DrawObjects(gr);
            return bmp;
        }

        /// <summary>
        /// Метод отрисовки фона
        /// </summary>
        /// <param name="g"></param>
        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)
                {//линия рамзетки места
                    g.DrawLine(pen, i * _placeSizeWidth, j * _placeSizeHeight,
                    i * _placeSizeWidth + _placeSizeWidth / 2, j * _placeSizeHeight);
                }
                g.DrawLine(pen, i * _placeSizeWidth, 0, i * _placeSizeWidth,
                _pictureHeight / _placeSizeHeight * _placeSizeHeight);
            }
        }

        /// <summary>
        /// Метод прорисовки объектов
        /// </summary>
        /// <param name="g"></param>
        private void DrawObjects(Graphics g)
        {
            int i = 0;
            foreach (var ship in _collection.GetShips())
            {
                if (ship != null)
                {
                    int inRow = _pictureWidth / _placeSizeWidth;
                    ship.SetPosition((inRow - 1 - (i % inRow)) * _placeSizeWidth, i / inRow * _placeSizeHeight);
                    ship.DrawTransport(g);
                }
                i++;
            }
        }
    }
}