import java.io.*;

/**
 * Created by root on 2/25/17.
 */
public class StandardWorldLoader implements WorldLoader {
    @Override
    public World load(InputStream in) throws IOException {

        if(in == null)
        {
            throw new IOException();
        }

            BufferedReader reader = new BufferedReader(new InputStreamReader(in));

            String firstLine = reader.readLine();
            int length = firstLine.charAt(0);
            int height = firstLine.charAt(2);

            World world = new World(length, height);

            for(int i = 0; i < height; i++)
            {
                String line = reader.readLine();

                for(int j = 0; i < length; j++)
                {
                    char c = line.charAt(j);

                    if(c == '1')
                    {
                        world.set(i, j, CellState.ALIVE);
                    }

                }
            }

            reader.close();
            return world;

    }

    @Override
    public void save(World world, OutputStream out) throws IOException
    {
        if(world == null)
        {
            throw new IOException();
        }
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out));
            String firstLine = Integer.toString(world.getWidth()) + "x" + Integer.toString(world.getHeight());

            writer.write(firstLine);
            writer.newLine();

            for (int i = 0; i < world.getHeight(); i++) {
                String line = "";

                for (int j = 0; i < world.getWidth(); j++) {
                    char c = world.get(j, i) == CellState.ALIVE ? '1' : '0';
                    line += c;
                }

                writer.write(line);
                writer.newLine();

            }
            writer.flush();
            writer.close();

    }
}