using Liner.MovingStrategies;
using Liner.Drawing;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Liner.Generics
{
    /// <summary>
    /// Параметризованный класс для набора объектов DrawningCar
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <typeparam name="U"></typeparam>
    public class LinerGenericCollection<T, U>
    where T : DrawingLiner
    where U : IMoveableObject
    {
        /// <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 = 100;
        /// <summary>
        /// Размер занимаемого объектом места (высота)
        /// </summary>
        private readonly int _placeSizeHeight = 80;
        /// <summary>
        /// Набор объектов
        /// </summary>
        private readonly SetGeneric<T> _collection;
        /// <summary>
        /// Конструктор
        /// </summary>
        /// <param name="picWidth"></param>
        /// <param name="picHeight"></param>
        public LinerGenericCollection(int picWidth, int picHeight)
        {
            int width = picWidth / _placeSizeWidth;
            int height = picHeight / _placeSizeHeight;
            _pictureWidth = picWidth;
            _pictureHeight = picHeight;
            _collection = new SetGeneric<T>(width * height);
        }
        /// </summary>
        /// Получение объектов коллекции
        /// <summary>
        public IEnumerable<T?> GetLiners => _collection.GetLiners();
        
        /// Перегрузка оператора сложения
        /// </summary>
        /// <param name="collect"></param>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static int? operator +(LinerGenericCollection<T, U> collect, T? obj)
        {
            if (obj == null)
            {
                return -1;
            }
            return collect?._collection.Insert(obj);
        }
        /// <summary>
        /// Перегрузка оператора вычитания
        /// </summary>
        /// <param name="collect"></param>
        /// <param name="pos"></param>
        /// <returns></returns>
        public static bool operator -(LinerGenericCollection<T, U> collect, int pos)
        {
            if (collect._collection[pos] != null)
            {
                collect._collection.Remove(pos);
                return true;
            }
            return false;
        }
        /// <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 ShowLiners()
        {
            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; j++)
                {
                    g.DrawRectangle(pen, i * _placeSizeWidth, j * _placeSizeHeight, _placeSizeWidth, _placeSizeHeight);
                }
            }
        }
        /// <summary>
        /// Метод прорисовки объектов
        /// </summary>
        /// <param name="g"></param>
        private void DrawObjects(Graphics g)
        {
            int iX = ((_pictureWidth / _placeSizeWidth) - 1) * _placeSizeWidth;
            int iY = 0;
            foreach (var liner in _collection.GetLiners())
            {
                liner?.SetPosition(iX, iY);
                liner?.DrawTransport(g);
                iX -= _placeSizeWidth;
                if (iX < 0)
                {
                    iX = ((_pictureWidth / _placeSizeWidth) - 1) * _placeSizeWidth;
                    iY += _placeSizeHeight;
                }
            }
        }
    }
}