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

namespace Catamaran
{
    internal abstract class AbstractMap
    {
        private IDrawingObject _drawingObject = null;
        protected int[,] _map = null;
        protected int _width;
        protected int _height;
        protected float _size_x;
        protected float _size_y;
        protected readonly Random _random = new Random();
        protected readonly int _freeRoad = 0;
        protected readonly int _barrier = 1;
        public Bitmap CreateMap(int width, int height, IDrawingObject drawingObject)
        {
            _width = width;
            _height = height;
            _drawingObject = drawingObject;
            GenerateMap();
            while (!SetObjectOnMap())
            {
                GenerateMap();
            }
            return DrawMapWithObject();
        }
        public Bitmap MoveObject(Direction direction)
        {
            bool isFree = true;
            int startPosX = (int)(_drawingObject.GetCurrentPosition().Left / _size_x);
            int startPosY = (int)(_drawingObject.GetCurrentPosition().Right / _size_y);
            int boatWidth = (int)(_drawingObject.GetCurrentPosition().Top / _size_x);
            int boatHeight = (int)(_drawingObject.GetCurrentPosition().Bottom / _size_y);

            switch (direction)
            {
                // вправо
                case Direction.Right:
                    for (int i = boatWidth; i <= boatWidth + (int)(_drawingObject.Step / _size_x); i++)
                    {
                        for (int j = startPosY; j <= boatHeight; j++)
                        {
                            if (_map[i, j] == _barrier)
                            {
                                isFree = false;
                                break;
                            }
                        }
                    }
                    break;
                //влево
                case Direction.Left:
                    for (int i = startPosX; i >= (int)(_drawingObject.Step / _size_x); i--)
                    {
                        for (int j = startPosY; j <= boatHeight; j++)
                        {
                            if (_map[i, j] == _barrier)
                            {
                                isFree = false;
                                break;
                            }
                        }
                    }
                    break;
                //вверх
                case Direction.Up:
                    for (int i = startPosX; i <= boatWidth; i++)
                    {
                        for (int j = startPosY; j >= (int)(_drawingObject.Step / _size_y); j--)
                        {
                            if (_map[i, j] == _barrier)
                            {
                                isFree = false;
                                break;
                            }
                        }
                    }
                    break;
                //вниз
                case Direction.Down:
                    for (int i = startPosX; i <= boatWidth; i++)
                    {
                        for (int j = boatHeight; j <= boatHeight + (int)(_drawingObject.Step / _size_y); j++)
                        {
                            if (_map[i, j] == _barrier)
                            {
                                isFree = false;
                                break;
                            }
                        }
                    }
                    break;
            }

            if (isFree)
            {
                _drawingObject.MoveObject(direction);
            }
            return DrawMapWithObject();
        }
            private bool SetObjectOnMap()
        {
            if (_drawingObject == null || _map == null)
            {
                return false;
            }
            int x = _random.Next(0, 10);
            int y = _random.Next(0, 10);
            _drawingObject.SetObject(x, y, _width, _height);
            // TODO првоерка, что объект не "накладывается" на закрытые участки
            _drawingObject.SetObject(x, y, _width, _height);
            int startPosX = (int)(_drawingObject.GetCurrentPosition().Left / _size_x);
            int startPosY = (int)(_drawingObject.GetCurrentPosition().Right / _size_y);
            int boatWidth = (int)(_drawingObject.GetCurrentPosition().Top / _size_x);
            int boatHeight = (int)(_drawingObject.GetCurrentPosition().Bottom / _size_y);
            for (int i = startPosX; i <= boatWidth; i++)
            {
                for (int j = startPosY; j <= boatHeight; j++)
                {
                    if (_map[i, j] == _barrier)
                    {
                        return false;
                    }
                }
            }
            return true;
        }
        private Bitmap DrawMapWithObject()
        {
            Bitmap bmp = new Bitmap(_width, _height);
            if (_drawingObject == null || _map == null)
            {
                return bmp;
            }
            Graphics gr = Graphics.FromImage(bmp);
            for (int i = 0; i < _map.GetLength(0); ++i)
            {
                for (int j = 0; j < _map.GetLength(1); ++j)
                {
                    if (_map[i, j] == _freeRoad)
                    {
                        DrawRoadPart(gr, i, j);
                    }
                    else if (_map[i, j] == _barrier)
                    {
                        DrawBarrierPart(gr, i, j);
                    }
                }
            }
            _drawingObject.DrawingObject(gr);
            return bmp;
        }
        protected abstract void GenerateMap();
        protected abstract void DrawRoadPart(Graphics g, int i, int j);
        protected abstract void DrawBarrierPart(Graphics g, int i, int j);

    }
}