// See https://aka.ms/new-console-template for more information

using System.Drawing;
using System.Net.Http.Headers;
using System.Runtime.CompilerServices;

var exampleChamber = new Chamber(7, "example-input.txt");

var puzzleChamber = new Chamber(7, "puzzle-input.txt");

abstract class Shape
{

}

// Chamber bottom right is 0,0.  Y points up.  0,0 is a "block"
class Chamber
{
    public enum WindDirection
    {
        Left,
        Right,
        None
    }

    public HashSet<Point> FilledSpaces { get; set; }

    public int ChamberWidth { get; private set; }

    public WindDirection[] WindDirections { get; private set; }

    public Chamber(int chamberWidth, string windfile)
    {
        FilledSpaces = new HashSet<Point>();
        ChamberWidth = chamberWidth;

        using (StreamReader reader = System.IO.File.OpenText(windfile))
        {
            while (!reader.EndOfStream)
            {
                var line = reader.ReadLine();
                if (line == null) throw new InvalidDataException();

                WindDirections = new WindDirection[line.Length];

                for (int i = 0; i < WindDirections.Length; i++)
                {
                    if (line[i] == '<')
                        WindDirections[i] = WindDirection.Left;
                    else if (line[i] == '>')
                        WindDirections[i] = WindDirection.Right;
                    else
                        throw new InvalidDataException();
                }
            }
        }

        if (WindDirections == null) throw new InvalidDataException();
    }

    public Rectangle Bounds
    {
        get
        {
            Point min = new Point(1,1), max = new Point(1,1);
            
            foreach (var item in FilledSpaces)
            {
                min.X = int.Min(min.X, item.X);
                min.Y = int.Min(min.Y, item.Y);
                max.X = int.Max(max.X, item.X);
                max.Y = int.Max(max.Y, item.Y);
            }

            return new Rectangle(0, 0, max.X - min.X, max.Y - min.Y);
        }
    }

    public void Draw()
    {
        var bounds = Bounds;

        int maxY = bounds.Height;
        for (int j = maxY; j > 0; j--)
        {
            Console.Write("|");
            for (int i = 1; i <= ChamberWidth; i++)
            {
                if (FilledSpaces.Contains(new Point(i,j)))
                {
                    Console.Write('#');
                }
                else
                {
                    Console.Write('.');
                }
            }
            Console.WriteLine("|");
        }
        Console.Write("+");
        for (int i = 1; i <= ChamberWidth; i++)
        {
            Console.Write("-");
        }
        Console.WriteLine("+");
    }
}