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

namespace ElectricLocomotive
{
    internal class DrawningElectricLocomotive
    {
        /// <summary>
        /// Класс-сущность
        /// </summary>
        public EntityElectricLocomotive? EntityElectricLocomotive { get; private set; }
        /// <summary>
        /// Ширина окна
        /// </summary>
        private int _pictureWidth;
        /// <summary>
        /// Высота окна
        /// </summary>
        private int _pictureHeight;
        /// <summary>
        /// Левая координата прорисовки автомобиля
        /// </summary>
        private int _startPosX;
        /// <summary>
        /// Верхняя кооридната прорисовки автомобиля
        /// </summary>
        private int _startPosY;
        /// <summary>
        /// Ширина прорисовки автомобиля
        /// </summary>
        private readonly int _locomotiveWidth = 120;
        /// <summary>
        /// Высота прорисовки автомобиля
        /// </summary>
        private readonly int _locomotiveHeight = 70;
        /// <summary>
        /// Инициализация свойств
        /// </summary>
        /// <param name="speed">Скорость</param>
        /// <param name="weight">Вес</param>
        /// <param name="bodyColor">Цвет кузова</param>
        /// <param name="additionalColor">Дополнительный цвет</param>
        /// <param name="horns">Признак наличия рогов</param>
        /// <param name="battery">Признак наличия отсека для батарей</param>
        /// <param name="width">Ширина картинки</param>
        /// <param name="height">Высота картинки</param>
        /// <returns>true - объект создан, false - проверка не пройдена, нельзя создать объект в этих размерах</returns>

        public bool Init(int speed, double weight, Color bodyColor, Color
        additionalColor, bool horns, bool battery, int width, int height)
        {
            if (width < _locomotiveWidth || height < _locomotiveHeight)
            {
                return false;
            }
            _pictureWidth = width;
            _pictureHeight = height;
            EntityElectricLocomotive = new EntityElectricLocomotive();
            EntityElectricLocomotive.Init(speed, weight, bodyColor, additionalColor,
            horns, battery);
            return true;
        }
        /// <summary>
        /// Установка позиции
        /// </summary>
        /// <param name="x">Координата X</param>
        /// <param name="y">Координата Y</param>
        public void SetPosition(int x, int y)
        {
            x = Math.Min(Math.Max(0, x), _pictureWidth - _locomotiveWidth);
            y = Math.Min(Math.Max(0, y), _pictureHeight - _locomotiveHeight);
            _startPosX = x;
            _startPosY = y;
        }
        /// <summary>
        /// Изменение направления перемещения
        /// </summary>
        /// <param name="direction">Направление</param>
        public void MoveTransport(DirectionType direction)
        {
            if (EntityElectricLocomotive == null)
            {
                return;
            }
            switch (direction)
            {
                //влево
                case DirectionType.Left:
                    if (_startPosX - EntityElectricLocomotive.Step > 0)
                    {
                        _startPosX -= (int)EntityElectricLocomotive.Step;
                    }
                    break;
                //вверх
                case DirectionType.Up:
                    if (_startPosY - EntityElectricLocomotive.Step > 0)
                    {
                        _startPosY -= (int)EntityElectricLocomotive.Step;
                    }
                    break;
                // вправо
                case DirectionType.Right:
                    if (_startPosX + _locomotiveWidth + EntityElectricLocomotive.Step < _pictureWidth)
                    {
                        _startPosX += (int)EntityElectricLocomotive.Step;
                    }
                    break;
                //вниз
                case DirectionType.Down:
                    if (_startPosY + _locomotiveHeight + EntityElectricLocomotive.Step < _pictureHeight)
                    {
                        _startPosY += (int)EntityElectricLocomotive.Step;
                    }
                    break;
            }
        }
        /// <summary>
        /// Прорисовка объекта
        /// </summary>
        /// <param name="g"></param>
        public void DrawTransport(Graphics g)
        {
            if (EntityElectricLocomotive == null)
            {
                return;
            }

            // корпус электровоза
            Pen pen = new(Color.Black, 5);
            Brush brush = new SolidBrush(EntityElectricLocomotive.BodyColor);
            Point[] points = new Point[5];
            points[0] = new Point(_startPosX, _startPosY + 40);
            points[1] = new Point(_startPosX + 10, _startPosY + 20);
            points[2] = new Point(_startPosX + 120, _startPosY + 20);
            points[3] = new Point(_startPosX + 120, _startPosY + 60);
            points[4] = new Point(_startPosX, _startPosY + 60);

            g.FillPolygon(brush, points);
            g.DrawLine(pen,
                new Point(_startPosX, _startPosY + 40),
                new Point(_startPosX + 120, _startPosY + 40));

            // окна
            brush = new SolidBrush(Color.FromArgb(0, 162, 232));
            g.FillRectangle(brush, _startPosX + 12, _startPosY + 24, 30, 11);
            g.FillEllipse(brush, _startPosX + 55, _startPosY + 24, 11, 11);
            g.FillEllipse(brush, _startPosX + 75, _startPosY + 24, 11, 11);
            g.FillEllipse(brush, _startPosX + 95, _startPosY + 24, 11, 11);

            // колёса
            brush = new SolidBrush(Color.Black);
            g.FillEllipse(brush, _startPosX + 10, _startPosY + 55, 15, 15);
            g.FillEllipse(brush, _startPosX + 25, _startPosY + 55, 15, 15);
            g.FillEllipse(brush, _startPosX + 80, _startPosY + 55, 15, 15);
            g.FillEllipse(brush, _startPosX + 95, _startPosY + 55, 15, 15);

            // рога
            if (EntityElectricLocomotive.Horns)
            {
                pen = new(Color.Black, 2);
                points = new Point[4];
                points[0] = new Point(_startPosX + 50, _startPosY + 20);
                points[1] = new Point(_startPosX + 40, _startPosY + 10);
                points[2] = new Point(_startPosX + 50, _startPosY);
                points[3] = new Point(_startPosX + 60, _startPosY + 10);
                g.DrawPolygon(pen, points);
            }
            // отсек для батарей
            if (EntityElectricLocomotive.Battery)
            {
                brush = new SolidBrush(EntityElectricLocomotive.AdditionalColor);
                g.FillRectangle(brush, _startPosX + 80, _startPosY + 45, 35, 9);
            }
        }

        /// <summary>
        /// Изменение размера поля
        /// </summary>
        /// <param name="newSize">Новый размер</param>
        public void SetPictureSize(Size newSize)
        {
            _pictureHeight = newSize.Height;
            _pictureWidth = newSize.Width;
        }

    }
}