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package se.l4.commons.serialization.format;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;

/**
 * Streamer that outputs JSON.
 * 
 * @author andreas
 *
 */
public class JsonOutput
	implements StreamingOutput
{
	private static final int HEX_MASK = (1 << 4) - 1;

	private static final char[] DIGITS = {
		'0', '1', '2', '3', '4', '5', '6', '7',
		'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
	};
	
	private final static char[] BASE64 = {
		'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
		'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
		'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
		'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
	};
	
	private static final int LEVELS = 20;
	
	protected final Writer writer;
	private final boolean beautify;
	
	private boolean[] lists;
	private boolean[] hasData;
	
	private int level;

	private final char[] encoded;
	
	/**
	 * Create a JSON streamer that will write to the given output.
	 * 
	 * @param out
	 */
	public JsonOutput(OutputStream out)
	{
		this(out, false);
	}
	
	/**
	 * Create a JSON streamer that will write to the given output, optionally
	 * with beautification of the generated JSON.
	 * 
	 * @param out
	 * @param beautify
	 */
	public JsonOutput(OutputStream out, boolean beautify)
	{
		this(new OutputStreamWriter(out, StandardCharsets.UTF_8), beautify);
	}
	
	/**
	 * Create a JSON streamer that will write to the given output.
	 * 
	 * @param out
	 */
	public JsonOutput(Writer writer)
	{
		this(writer, false);
	}
	
	/**
	 * Create a JSON streamer that will write to the given output, optionally
	 * with beautification of the generated JSON.
	 * 
	 * @param out
	 * @param beautify
	 */
	public JsonOutput(Writer writer, boolean beautify)
	{
		this.writer = writer;
		this.beautify = beautify;
		
		lists = new boolean[LEVELS];
		hasData = new boolean[LEVELS];
		
		encoded = new char[4];
	}
	
	@Override
	public void close()
		throws IOException
	{
		flush();
		writer.close();
	}
	
	/**
	 * Escape and write the given string.
	 * 
	 * @param in
	 * @throws IOException
	 */
	private void writeEscaped(String in)
		throws IOException
	{
		for(int i=0, n=in.length(); i>>= 4;
				}
				while (v != 0);
				
				for(int j=0; j 0)
		{
			writer.write('\n');
			
			for(int i=0; i 0 ? (data[pos] << 24) >>> 8 : 0) |
			(len > 1 ? (data[pos+1] << 24) >>> 16 : 0) |
			(len > 2 ? (data[pos+2] << 24) >>> 24 : 0);
		
		switch(len)
		{
			case 3:
				writer.write(chars[loc >>> 18]);
				writer.write(chars[(loc >>> 12) & 0x3f]);
				writer.write(chars[(loc >>> 6) & 0x3f]);
				writer.write(chars[loc & 0x3f]);
				break;
			case 2:
				writer.write(chars[loc >>> 18]);
				writer.write(chars[(loc >>> 12) & 0x3f]);
				writer.write(chars[(loc >>> 6) & 0x3f]);
				writer.write('=');
				break;
			case 1:
				writer.write(chars[loc >>> 18]);
				writer.write(chars[(loc >>> 12) & 0x3f]);
				writer.write('=');
				writer.write('=');
		}
	}
	
	@Override
	public void writeNull(String name)
		throws IOException
	{
		write(name, (String) null);
	}
	
	@Override
	public void flush() throws IOException
	{
		writer.flush();
	}
}