using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Threading.Tasks;
using PIbd_21_Potapov_N.S._Catamaran_Base;

namespace PIbd_21_Potapov_N.S._Catamaran_Base
{
    /// <summary>
    /// Класс, отвечающий за прорисовку и перемещение объекта-сущности
    /// </summary>
    internal class DrawingCatamaran
    {
        /// <summary>
        /// Класс-сущность
        /// </summary>
        public EntityCatamaran Catamaran { protected set; get; }
        /// <summary>
        /// Левая координата отрисовки катамарана
        /// </summary>
        private float _startPosX;
        /// <summary>
        /// Верхняя кооридната отрисовки катамарана
        /// </summary>
        private float _startPosY;
        /// <summary>
        /// Ширина окна отрисовки
        /// </summary>
        private int? _pictureWidth = null;
        /// <summary>
        /// Высота окна отрисовки
        /// </summary>
        private int? _pictureHeight = null;
        /// <summary>
        /// Ширина отрисовки катамарана
        /// </summary>
        private readonly int _catamaranWidth = 100;
        /// <summary>
        /// Высота отрисовки катамарана
        /// </summary>
        private readonly int _catamaranHeight = 40;
        /// <summary>
        /// Инициализация свойств
        /// </summary>
        /// <param name="speed">Скорость</param>
        /// <param name="weight">Вес катамарана</param>
        /// <param name="bodyColor">Цвет корпуса</param>
        public void Init(int speed, float weight, Color bodyColor)
        {
            Catamaran = new EntityCatamaran();
            Catamaran.Init(speed, weight, bodyColor);
        }
        /// <summary>
        /// Установка позиции катамарана
        /// </summary>
        /// <param name="x">Координата X</param>
        /// <param name="y">Координата Y</param>
        /// <param name="width">Ширина картинки</param>
        /// <param name="height">Высота картинки</param>
        public void SetPosition(int x, int y, int width, int height)
        {
            // TODO проверки
            _startPosX = x;
            _startPosY = y;
            _pictureWidth = width;
            _pictureHeight = height;
        }
        /// <summary>
        /// Изменение направления перемещения
        /// </summary>
        /// <param name="direction">Направление</param>
        public void MoveTransport(Direction direction)
        {
            if (!_pictureWidth.HasValue || !_pictureHeight.HasValue)
            {
                return;
            }
            switch (direction)
            {
                // вправо
                case Direction.Right:
                    if (_startPosX + _catamaranWidth + Catamaran.Step < _pictureWidth)
                    {
                        _startPosX += Catamaran.Step;
                    }
                    break;
                //влево
                case Direction.Left:
                    if (_startPosX - Catamaran.Step > 0)
                    {
                        _startPosX -= Catamaran.Step;
                    }
                    break;
                //вверх
                case Direction.Up:
                    if (_startPosY - Catamaran.Step > 0)
                    {
                        _startPosY -= Catamaran.Step;
                    }
                    break;
                //вниз
                case Direction.Down:
                    if (_startPosY + _catamaranHeight + Catamaran.Step < _pictureHeight)
                    {
                        _startPosY += Catamaran.Step;
                    }
                    break;
            }
        }
        /// <summary>
        /// Отрисовка катамарана
        /// </summary>
        /// <param name="g"></param>
        public void DrawTransport(Graphics g)
        {
            if (_startPosX < 0 || _startPosY < 0 
                || !_pictureHeight.HasValue || !_pictureWidth.HasValue)
            {
                return;
            }

            SolidBrush brush = new SolidBrush(Catamaran.BodyColor);

            PointF[] bodyPoints = new PointF[5];
            bodyPoints[0] = new PointF(_startPosX, _startPosY);
            bodyPoints[1] = new PointF(_startPosX + _catamaranWidth - _catamaranWidth / 4, _startPosY);
            bodyPoints[2] = new PointF(_startPosX + _catamaranWidth, _startPosY + _catamaranHeight / 2);
            bodyPoints[3] = new PointF(_startPosX + _catamaranWidth - _catamaranWidth / 4, _startPosY + _catamaranHeight);
            bodyPoints[4] = new PointF(_startPosX, _startPosY + _catamaranHeight);

            // Отрисовка корпуса катамарана
            g.FillPolygon(brush, bodyPoints);
            g.DrawPolygon(Pens.Black, bodyPoints);

            // Отрисовка головы катамарана
            g.FillEllipse(Brushes.White, _startPosX + _catamaranWidth / 8, _startPosY + _catamaranHeight / 8,
                _catamaranWidth / 2, _catamaranHeight - _catamaranHeight / 4);
            g.DrawEllipse(Pens.Black, _startPosX + _catamaranWidth / 8, _startPosY + _catamaranHeight / 8,
                _catamaranWidth / 2, _catamaranHeight - _catamaranHeight / 4);
        }
    }
}