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

namespace Artilleries
{
    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;
            do
            {
                GenerateMap();
            }
            while (!SetObjectOnMap());
            return DrawMapWithObject();
        }

        public Bitmap MoveObject(Direction direction)
        {
            _drawingObject.MoveObject(direction);
            if (ObjectIntersects())
            {
                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;
            }

            for (int i = 2; i < _map.GetLength(0); i++)
            {
                for (int j = 2; j < _map.GetLength(1); j++)
                {
                    _drawingObject.SetObject((int) (i * _size_x), (int) (j * _size_y), _width, _height);
                    if (!ObjectIntersects()) return true;
                }
            }

            return true;
        }

        private bool ObjectIntersects()
        {
            var location = _drawingObject.GetCurrentPosition();
            for (int i = 0; i < _map.GetLength(0); i++)
            {
                for (int j = 0; j < _map.GetLength(1); j++)
                {
                    if (_map[i, j] == _barrier)
                    {
                        if (i * _size_x >= location.Left && (i + 1) * _size_x <= location.Right && j * _size_y >= location.Top && (j + 1) * _size_y <= location.Bottom)
                        {
                            return true;
                        }
                    }
                }
            }

            return false;
        }

        private Bitmap DrawMapWithObject()
        {
            Bitmap bmp = new Bitmap(_width, _height);
            if (_drawingObject == null || _map == null)
            {
                return bmp;
            }
            Graphics g = 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(g, i, j);
                    } else if (_map[i, j] == _barrier)
                    {
                        DrawBarrierPart(g, i, j);
                    }
                }
            }
            _drawingObject.DrawingObject(g);
            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);
    }
}