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

namespace Bus
{
    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 drawningObject)
        {
            _width = width;
            _height = height;
            _drawingObject = drawningObject;
            GenerateMap();
            while (!SetObjectOnMap())
            {
                GenerateMap();
            }
            return DrawMapWithObject();
        }


        public Bitmap MoveObject(Direction direction)
        {
            // proverka
            _drawingObject.MoveObject(direction);

            bool collision = CheckCollision();

            if (collision)
            {
                switch (direction)
                {
                    case Direction.Left:
                        _drawingObject.MoveObject(Direction.Right);
                        break;
                    case Direction.Right:
                        _drawingObject.MoveObject(Direction.Left);
                        break;
                    case Direction.Up:
                        _drawingObject.MoveObject(Direction.Down);
                        break;
                    case Direction.Down:
                        _drawingObject.MoveObject(Direction.Up);
                        break;
                }
            }

            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);
            //////////////////////////////// proverka
            return true;
        }

        private Bitmap DrawMapWithObject()
        {
            Bitmap bmp = new(_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;

        }



        private bool CheckCollision()
        {
            var pos = _drawingObject.GetCurrentPosition();
            int startX = (int)((pos.Left) / _size_x);
            int endX = (int)((pos.Right) / _size_x);
            int startY = (int)((pos.Top) / _size_y);
            int endY = (int)((pos.Bottom) / _size_y);

            if (startX < 0 || startY < 0 || endX > _map.GetLength(1) || endY > _map.GetLength(0)) { return false; }



            for (int y = startY; y < endY; y++)
            {
                for (int x = startX; x < endX; x++)
                {
                    if (_map[x, y] == _barrier)
                    {
                        return true;
                    }
                }
            }

            return false;
        }

        protected abstract void GenerateMap();
        protected abstract void DrawRoadPart(Graphics g, int i, int j);
        protected abstract void DrawBarrierPart(Graphics g, int i, int j);
    }
}