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

namespace HoistingCrane
{
    internal class DrawingHoistingCrane
    {
            public EntityHoistingCrane HoistingCrane { get; private set; }

            private float _startPosX;
            private float _startPosY;
            private int? _pictureWidth = null;
            private int? _pictureHeight = null;
            private readonly int _hoistingCraneWidth = 80;
            private readonly int _hoistingCraneHeight = 50;

            public void Init(int speed, float weight, Color bodyColor)
            {
                HoistingCrane = new EntityHoistingCrane();
                HoistingCrane.Init(speed, weight, bodyColor);
            }

            public void SetPosition(int x, int y, int width, int height)
            {
                // TODO checks
                _startPosX = x;
                _startPosY = y;
                _pictureWidth = width;
                _pictureHeight = height;
            }

            public void MoveTransport(Direction direction)
            {
                if (!_pictureWidth.HasValue || !_pictureHeight.HasValue)
                {
                    return;
                }
                switch (direction)
                {
                    // вправо
                    case Direction.Right:
                        if (_startPosX + _hoistingCraneWidth + HoistingCrane.Step < _pictureWidth)
                        {
                            _startPosX += HoistingCrane.Step;
                        }
                        break;
                    //влево
                    case Direction.Left:
                        if (_startPosX - HoistingCrane.Step > 0)
                        {
                            _startPosX -= HoistingCrane.Step;
                        }
                        break;
                    //вверх
                    case Direction.Up:
                        if (_startPosY - HoistingCrane.Step > 0)
                        {
                            _startPosY -= HoistingCrane.Step;
                        }
                        break;
                    //вниз
                    case Direction.Down:
                        if (_startPosY + _hoistingCraneHeight + HoistingCrane.Step < _pictureHeight)
                        {
                            _startPosY += HoistingCrane.Step;
                        }
                        break;
                }
            }
            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 + 25, 75, 20);
                g.DrawRectangle(pen, _startPosX, _startPosY, 25, 25);
                g.DrawRectangle(pen, _startPosX + 4, _startPosY + 4, 17, 17);
                g.DrawRectangle(pen, _startPosX + 52, _startPosY + 7, 6, 18);
                g.DrawEllipse(pen, _startPosX - 5, _startPosY + 45, 20, 20);
                g.DrawEllipse(pen, _startPosX + 63, _startPosY + 45, 20, 20);
                g.DrawRectangle(pen, _startPosX + 5, _startPosY + 45, 68, 20);
                g.DrawEllipse(pen, _startPosX - 1, _startPosY + 46, 18, 18);
                g.DrawEllipse(pen, _startPosX + 62, _startPosY + 46, 18, 18);
                g.DrawEllipse(pen, _startPosX + 20, _startPosY + 53, 10, 10);
                g.DrawEllipse(pen, _startPosX + 35, _startPosY + 53, 10, 10);
                g.DrawEllipse(pen, _startPosX + 50, _startPosY + 53, 10, 10);
                g.DrawRectangle(pen, _startPosX + 30, _startPosY + 45, 4, 6);
                g.DrawRectangle(pen, _startPosX + 45, _startPosY + 45, 4, 6);

                //корпус
                Brush br = new SolidBrush(HoistingCrane?.BodyColor ?? Color.Black);
                g.FillRectangle(br, _startPosX, _startPosY + 25, 75, 25);
                g.FillRectangle(br, _startPosX, _startPosY, 25, 25);

                //окно
                Brush brBlue = new SolidBrush(Color.Blue);
                g.FillRectangle(brBlue, _startPosX + 4, _startPosY + 4, 17, 17);

                //выхлопная труба
                Brush brBrown = new SolidBrush(Color.DarkGray);
                g.FillRectangle(brBrown, _startPosX + 52, _startPosY + 7, 6, 18);

                //гусеница
                Brush brDarkGray = new SolidBrush(Color.DarkGray);
                g.FillEllipse(brDarkGray, _startPosX - 5, _startPosY + 45, 20, 20);
                g.FillEllipse(brDarkGray, _startPosX + 63, _startPosY + 45, 20, 20);
                g.FillRectangle(brDarkGray, _startPosX + 5, _startPosY + 45, 68, 20);

                Brush brBlack = new SolidBrush(Color.Black);
                g.FillEllipse(brBlack, _startPosX - 1, _startPosY + 46, 18, 18);
                g.FillEllipse(brBlack, _startPosX + 62, _startPosY + 46, 18, 18);
                g.FillEllipse(brBlack, _startPosX + 20, _startPosY + 53, 10, 10);
                g.FillEllipse(brBlack, _startPosX + 35, _startPosY + 53, 10, 10);
                g.FillEllipse(brBlack, _startPosX + 50, _startPosY + 53, 10, 10);
                g.FillRectangle(brBlack, _startPosX + 30, _startPosY + 45, 4, 6);
                g.FillRectangle(brBlack, _startPosX + 45, _startPosY + 45, 4, 6);
            }

            public void ChangeBorders(int width, int height)
            {
                _pictureWidth = width;
                _pictureHeight = height;
                if (_pictureWidth <= _hoistingCraneWidth || _pictureHeight <= _hoistingCraneHeight)
                {
                    _pictureWidth = null;
                    _pictureHeight = null;
                    return;
                }
                if (_startPosX + _hoistingCraneWidth > _pictureWidth)
                {
                    _startPosX = _pictureWidth.Value - _hoistingCraneWidth;
                }
                if (_startPosY + _hoistingCraneHeight > _pictureHeight)
                {
                    _startPosY = _pictureHeight.Value - _hoistingCraneHeight;
                }
            }
    }
}