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

namespace ProjectMonorail.Drawings;

/// <summary>
/// Класс, отвечающий за прорисовку и перемещение базового объекта-сущности
/// </summary>
public class DrawingTrain
{
    /// <summary>
    /// Класс-сущность "монорельс"
    /// </summary>
    public EntityTrain? EntityTrain { get; protected set; }

    /// <summary>
    /// Высота окна
    /// </summary>
    private int? _pictureHeight;

    /// <summary>
    /// Ширина окна
    /// </summary>
    private int? _pictureWidth;

    /// <summary>
    /// Левая координата прорисовки монорельса
    /// </summary>
    protected int? _startPosX;

    /// <summary>
    /// Верхняя координата прорисовки монорельса
    /// </summary>
    protected int? _startPosY;

    /// <summary>
    /// Высота прорисовки монорельса
    /// </summary>
    private readonly int _drawingMonorailHeight = 40;

    /// <summary>
    /// Ширина прорисовки монорельса
    /// </summary>
    private readonly int _drawingMonorailWidth = 95;

    /// <summary>
    /// Координата X объекта
    /// </summary>
    public int? GetPosX => _startPosX;

    /// <summary>
    /// Координата Y объекта
    /// </summary>
    public int? GetPosY => _startPosY;

    /// <summary>
    /// Ширина объекта
    /// </summary>
    public int GetWidth => _drawingMonorailWidth;

    /// <summary>
    /// Высота объекта
    /// </summary>
    public int GetHeight => _drawingMonorailHeight;

    /// <summary>
    /// Пустой конструктор
    /// </summary>
    public DrawingTrain()
    {
        _pictureHeight = null;
        _pictureWidth = null;
        _startPosX = null;
        _startPosY = null;
    }

    /// <summary>
    /// Конструктор
    /// </summary>
    /// <param name="speed">Скорость</param>
    /// <param name="weight">Вес</param>
    /// <param name="mainColor">Основной цвет</param>
    public DrawingTrain(int speed, double weight, Color mainColor) : this()
    {
        EntityTrain = new EntityTrain(speed, weight, mainColor);
    }

    public DrawingTrain(EntityTrain? entityTrain)
    {
        if (entityTrain != null)
        {
            EntityTrain = entityTrain;
        }
    }

    /// <summary>
    /// Конструктор для наследников
    /// </summary>
    /// <param name="drawingMonorailHeight">Высота</param>
    /// <param name="drawingMonorailWidth">Ширина</param>
    protected DrawingTrain(int drawingMonorailHeight, int drawingMonorailWidth) : this()
    {
        _drawingMonorailHeight = drawingMonorailHeight;
        _drawingMonorailWidth = drawingMonorailWidth;
    }

    /// <summary>
    /// Установка границ поля
    /// </summary>
    /// <param name="width">Ширина поля</param>
    /// <param name="height">Высота поля</param>
    /// <returns></returns>
    public bool SetPictureSize(int width, int height)
    {
        if (_drawingMonorailWidth <= width && _drawingMonorailHeight <= height)
        {
            _pictureWidth = width;
            _pictureHeight = height;
            if (_startPosX.HasValue && _startPosY.HasValue)
            {
                if (_startPosX + _drawingMonorailWidth > _pictureWidth)
                {
                    _startPosX = _pictureWidth - _drawingMonorailWidth;
                }
                if (_startPosY + _drawingMonorailHeight > _pictureHeight)
                {
                    _startPosY = _pictureHeight - _drawingMonorailHeight;
                }
            }
            return true;
        }
        return false;
    }

    /// <summary>
    /// Установка позиции
    /// </summary>
    /// <param name="x">Координата x</param>
    /// <param name="y">Координата y</param>
    public void SetPosition(int x, int y)
    {
        if (!_pictureHeight.HasValue || !_pictureWidth.HasValue)
        {
            return;
        }
        if (x < 0)
        {
            x = 0;
        }
        if (x + _drawingMonorailWidth > _pictureWidth.Value)
        {
            x = _pictureWidth.Value - _drawingMonorailWidth;
        }
        if (y < 0)
        {
            y = 0;
        }
        if (y + _drawingMonorailHeight > _pictureHeight.Value)
        {
            y = _pictureHeight.Value - _drawingMonorailHeight;
        }
        _startPosX = x;
        _startPosY = y;
    }

    /// <summary>
    /// Изменение направления перемещения
    /// </summary>
    /// <param name="direction">Направление</param>
    /// <returns>true - перемещение выполнено; false - перемещение невозможно</returns>
    public bool MoveTransport(DirectionType direction)
    {
        if (EntityTrain == null || !_startPosX.HasValue || !_startPosY.HasValue)
        {
            return false;
        }

        switch (direction)
        {
            //Перемещение влево
            case DirectionType.Left:
                if (_startPosX.Value - EntityTrain.Step > 0)
                {
                    _startPosX -= (int)EntityTrain.Step;
                }
                return true;
            //Перемещение вправо
            case DirectionType.Right:
                if (_startPosX.Value + _drawingMonorailWidth + EntityTrain.Step < _pictureWidth)
                {
                    _startPosX += (int)EntityTrain.Step;
                }
                    return true;
            //Перемещение вверх
            case DirectionType.Up:
                if (_startPosY.Value - EntityTrain.Step > 0)
                {
                    _startPosY -= (int)EntityTrain.Step;
                }
                return true;
            //Перемещение вниз
            case DirectionType.Down:
                if (_startPosY.Value + _drawingMonorailHeight + EntityTrain.Step < _pictureHeight)
                {
                    _startPosY += (int)EntityTrain.Step;
                }
                return true;
            default: return false;
        }
    }

    /// <summary>
    /// Прорисовка объекта
    /// </summary>
    /// <param name="g"></param>
    public virtual void DrawTransport(Graphics g)
    {
        if (EntityTrain == null || !_startPosX.HasValue || !_startPosY.HasValue)
        {
            return;
        }

        Pen pen = new(Color.Black);
        Brush mainBrush = new SolidBrush(EntityTrain.MainColor);
        Brush brBlue = new SolidBrush(Color.LightBlue);
        Brush brWhite = new SolidBrush(Color.White);
        Brush brBlack = new SolidBrush(Color.Black);

        //Границы монорельса
        g.DrawRectangle(pen, _startPosX.Value + 5, _startPosY.Value + 15, 80, 15);
        Point[] points1 = {
        new Point(_startPosX.Value + 10, _startPosY.Value),
        new Point(_startPosX.Value + 85, _startPosY.Value),
        new Point(_startPosX.Value + 85, _startPosY.Value + 15),
        new Point(_startPosX.Value + 5, _startPosY.Value + 15)
    };
        g.DrawPolygon(pen, points1);
        g.FillRectangle(mainBrush, _startPosX.Value + 6, _startPosY.Value + 16, 79, 14);
        Point[] points2 = {
        new Point(_startPosX.Value + 10, _startPosY.Value + 1),
        new Point(_startPosX.Value + 85, _startPosY.Value + 1),
        new Point(_startPosX.Value + 85, _startPosY.Value + 15),
        new Point(_startPosX.Value + 5, _startPosY.Value + 15)
    };
        g.FillPolygon(mainBrush, points2);

        //Держатель 1
        Point[] points_cart1 = {
        new Point(_startPosX.Value, _startPosY.Value + 35),
        new Point(_startPosX.Value + 15, _startPosY.Value + 35),
        new Point(_startPosX.Value + 15, _startPosY.Value + 30),
        new Point(_startPosX.Value + 5, _startPosY.Value + 30)
    };
        g.DrawPolygon(pen, points_cart1);
        g.FillPolygon(brBlack, points_cart1);

        //Держатель 2
        Point[] points_cart2 = {
        new Point(_startPosX.Value + 20, _startPosY.Value + 30),
        new Point(_startPosX.Value + 25, _startPosY.Value + 35),
        new Point(_startPosX.Value + 30, _startPosY.Value + 35),
        new Point(_startPosX.Value + 35, _startPosY.Value + 30)
    };
        g.DrawPolygon(pen, points_cart2);
        g.FillPolygon(brBlack, points_cart2);

        //Держатель 3
        Point[] points_cart3 = {
        new Point(_startPosX.Value + 55, _startPosY.Value + 30),
        new Point(_startPosX.Value + 60, _startPosY.Value + 35),
        new Point(_startPosX.Value + 65, _startPosY.Value + 35),
        new Point(_startPosX.Value + 70, _startPosY.Value + 30)
    };
        g.DrawPolygon(pen, points_cart3);
        g.FillPolygon(brBlack, points_cart3);

        //Держатель 4
        Point[] points_cart4 = {
        new Point(_startPosX.Value + 70, _startPosY.Value + 30),
        new Point(_startPosX.Value + 75, _startPosY.Value + 35),
        new Point(_startPosX.Value + 90, _startPosY.Value + 35),
        new Point(_startPosX.Value + 85, _startPosY.Value + 30)
    };
        g.DrawPolygon(pen, points_cart4);
        g.FillPolygon(brBlack, points_cart4);

        //Окна монорельса
        g.DrawRectangle(pen, _startPosX.Value + 17, _startPosY.Value + 5, 17, 7);
        g.FillRectangle(brBlue, _startPosX.Value + 18, _startPosY.Value + 6, 16, 6);
        g.DrawRectangle(pen, _startPosX.Value + 55, _startPosY.Value + 5, 27, 7);
        g.FillRectangle(brBlue, _startPosX.Value + 56, _startPosY.Value + 6, 26, 6);

        //Дверь монорельса
        g.DrawRectangle(pen, _startPosX.Value + 40, _startPosY.Value + 7, 10, 21);
        g.FillRectangle(brWhite, _startPosX.Value + 41, _startPosY.Value + 8, 9, 20);

        //колёса
        //1, 4 колесо
        g.DrawEllipse(pen, _startPosX.Value + 15, _startPosY.Value + 30, 10, 10);
        g.FillEllipse(brWhite, _startPosX.Value + 15, _startPosY.Value + 30, 10, 10);
        g.DrawEllipse(pen, _startPosX.Value + 65, _startPosY.Value + 30, 10, 10);
        g.FillEllipse(brWhite, _startPosX.Value + 65, _startPosY.Value + 30, 10, 10);

    }
}