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

namespace ArmoredVehicle
{
    internal abstract class AbstractMap
    {
        private IDrawningObject _drawningObject = null;
        protected int[,] _map = null;
        protected int _width;
        protected int _height;
        protected float _size_x;
        protected float _size_y;
        protected readonly Random _random = new();
        protected readonly int _freeRoad = 0;
        protected readonly int _barrier = 1;

        public Bitmap CreateMap(int width, int height, IDrawningObject drawningObject)
        {
            _width = width;
            _height = height;
            _drawningObject = drawningObject;
            GenerateMap();

            while (!SetObjectOnMap())
            {
                GenerateMap();
            }
            return DrawMapWithObject();
        }
        public Bitmap MoveObject(Direction direction)
        {
            bool possibility = true;
            (float XTop, float YTop, float XBottom, float YBottom) = _drawningObject.GetCurrentPosition();
            bool busy = false;
            int i;
            int j;
            int jt;
            int i1;
            switch (direction)
            {
                // вправо
                case Direction.Right:
                    busy = false;
                    i = Math.Abs((int)Math.Ceiling(XBottom / _size_x));
                    j = Math.Abs((int)Math.Ceiling(YBottom / _size_y));
                    jt = Math.Abs((int)Math.Ceiling(YTop / _size_y));
                    i1 = Math.Abs((int)Math.Ceiling((XBottom + _drawningObject.Step)/ _size_x));
                    for (int r = i; r < i1; ++r)
                    {
                        for (int b = jt; b < j; ++b)
                        {
                            if (_map[r, b] == _barrier)
                            {
                                busy = true;
                                break;
                            }

                        }
                        if (busy)
                        {
                            break;
                        }
                    }

                    break;
                //влево
                case Direction.Left:
                    busy = false;
                    i = Math.Abs((int)Math.Ceiling((XTop - _drawningObject.Step )/ _size_x));
                    j = Math.Abs((int)Math.Ceiling(YBottom / _size_y));
                    jt = Math.Abs((int)Math.Ceiling(YTop / _size_y));
                    i1 = Math.Abs((int)Math.Ceiling((XTop)/ _size_x));
                    for (int r = i; r < i1; ++r)
                    {
                        for (int b = jt; b < j; ++b)
                        {
                            if (_map[r, b] == _barrier)
                            {
                                busy = true;
                                break;
                            }

                        }
                        if (busy)
                        {
                            break;
                        }
                    }

                    break;
                //вверх
                case Direction.Up:
                    {
                        busy = false;
                        i = Math.Abs((int)Math.Ceiling((XTop) / _size_x));
                        j = Math.Abs((int)((YTop)/ _size_y));
                        jt = Math.Abs((int)((YTop - _drawningObject.Step )/ _size_y));
                        i1 = Math.Abs((int)Math.Ceiling(XBottom / _size_x));
                        for (int r = i; r < i1; ++r)
                        {
                            for (int b = jt; b < j; ++b)
                            {
                                if (_map[r, b] == _barrier)
                                {
                                    busy = true;
                                    break;
                                }

                            }
                            if (busy)
                            {
                                break;
                            }
                        }
                        break;
                    }
                //вниз
                case Direction.Down:
                    {
                        busy = false;
                        i = (int)Math.Ceiling(XTop / _size_x);
                        j = (int)((YBottom + _drawningObject.Step) / _size_y);
                        jt = (int)(YBottom / _size_y);
                        i1 = (int)Math.Ceiling(XBottom / _size_x);
                        for (int r = i; r <= i1; r++)
                        {
                            for (int b = jt; b <= j; b++)
                            {
                                if (_map[r, b] == _barrier)
                                {
                                    busy = true;
                                    break;
                                }

                            }
                            if (busy)
                            {
                                break;
                            }
                        }
                        break;
                    }
            }
            if (busy)
            {
                possibility = false;
            }
            if (possibility)
            {
                _drawningObject.MoveObject(direction);
            }
            return DrawMapWithObject();
        }
        private bool SetObjectOnMap()
        {
            if (_drawningObject == null || _map == null)
            {
                return false;
            }
            (float XTop, float YTop, float XBottom, float YBottom) = _drawningObject.GetCurrentPosition();

            int x = _random.Next(0, 10);
            int y = _random.Next(0, 10);

            int beginI = (int)(x / _size_x);
            int endI = (int)(XBottom / _size_x);

            int beginJ = (int)(y / _size_y);
            int endJ = (int)(YBottom / _size_y);

            for (int i = beginI; i <= endI; i++)
            {
                for(int j = beginJ; j <= endJ; j++)
                {
                    if(_map[i, j] == _barrier)
                    {
                        return false;
                    }
                }
               
            }

            _drawningObject.SetObject(x, y, _width, _height);
            return true;
        }
        private Bitmap DrawMapWithObject()
        {
            Bitmap bmp = new(_width, _height);
            if (_drawningObject == 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);
                    }
                }
            }
            DrawRec(gr, 50, 50);
            _drawningObject.DrawningObject(gr);
            return bmp;
        }
        public void DrawRec(Graphics g, int countI, int couJj)
        {
            Pen p = new Pen(Color.Black);
            for (int i = 0; i < countI; i++)
            {
                g.DrawLine(p, i * _size_x, 0, i * _size_x, 1000);
                g.DrawLine(p, 0, i * _size_y, 1000, i * _size_y);
            }
        }
        protected abstract void GenerateMap();
        protected abstract void DrawRoadPart(Graphics g, int i, int j);
        protected abstract void DrawBarrierPart(Graphics g, int i, int j);
    }
}