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

namespace Catamaran
{
   internal class DrawingCatamaran
    {
        /// <summary>
        /// Класс-сущность
        /// </summary>
        public EntityCatamaran Catamaran { private set; get; }
        /// <summary>
        /// Левая координата отрисовки лодки
        /// </summary>
        private float _startPosX;
        /// <summary>
        /// Верхняя кооридната отрисовки лодки
        /// </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 лодки
        /// </summary>
        private readonly int _catamaranWidth = 80;
        /// <summary>
        /// Высота отрисовки лодки
        /// </summary>
        private readonly int _catamaranHeight = 50;
        /// <summary>
        /// Инициализация свойств
        /// </summary>
        /// <param name="speed">Скорость</param>
        /// <param name="weight">Вес лодки</param>
        /// <param name="bodyColor">Цвет лодки</param>
        public void Init(int speed, float weight, Color bodyColor)
        {
            Catamaran = new EntityCatamaran();
            Catamaran.Init(speed, weight, bodyColor);
        }
        /// <summary>
        /// Установка позиции лодки
        /// </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)
        {
            if (x < 0 || y < 0 || x + _catamaranWidth > width || y + _catamaranHeight > height) return;
            _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 лодки
        /// </summary>
        /// <param name="g"></param>
        public void DrawTransport(Graphics g)
        {
            if (_startPosX < 0 || _startPosY < 0
            || !_pictureHeight.HasValue || !_pictureWidth.HasValue)
            {
                return;
            }
            Pen pen = new Pen(Color.Black);
            //границы
            g.DrawRectangle(pen, _startPosX, _startPosY, _catamaranWidth * 3 / 4, _catamaranHeight);

            Point point_1 = new Point((int)(_startPosX + _catamaranWidth * 3 / 4), (int)_startPosY);
            Point point_2 = new Point((int)(_startPosX + _catamaranWidth), (int)(_startPosY + _catamaranHeight / 2));
            Point point_3 = new Point((int)(_startPosX + _catamaranWidth * 3 / 4), (int)(_startPosY + _catamaranHeight));
            Point[] pointsArray = {point_1, point_2, point_3};
            g.DrawPolygon(pen, pointsArray);
            Brush br = new SolidBrush(Catamaran?.BodyColor ?? Color.Black);
            g.FillRectangle(br, _startPosX, _startPosY, _catamaranWidth * 3 / 4, _catamaranHeight);
            g.FillPolygon(br, pointsArray);

            // середина
            g.DrawEllipse(pen, _startPosX +  5, _startPosY +  5, _catamaranWidth - 15, _catamaranHeight - 15);
            Brush brBlue = new SolidBrush(Color.LightBlue);
            g.FillEllipse(brBlue, _startPosX + 5, _startPosY + 5, _catamaranWidth - 15, _catamaranHeight - 15);
        }
        /// <summary>
        /// Смена границ формы отрисовки
        /// </summary>
        /// <param name="width">Ширина картинки</param>
        /// <param name="height">Высота картинки</param>
        public void ChangeBorders(int width, int height)
        {
            _pictureWidth = width;
            _pictureHeight = height;
            if (_pictureWidth <= _catamaranWidth || _pictureHeight <= _catamaranHeight)
            {
                _pictureWidth = null;
                _pictureHeight = null;
                return;
            }
            if (_startPosX + _catamaranWidth > _pictureWidth)
            {
                _startPosX = _pictureWidth.Value - _catamaranWidth;
            }
            if (_startPosY + _catamaranHeight > _pictureHeight)
            {
                _startPosY = _pictureHeight.Value - _catamaranHeight;
            }
        }
    }
}