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package com.venky.xml;

//import com.sun.org.apache.xerces.internal.parsers.DOMParser;
//import com.sun.org.apache.xml.internal.serialize.OutputFormat;
//import com.sun.org.apache.xml.internal.serialize.XMLSerializer;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;

import com.venky.core.io.ByteArrayInputStream;
import com.venky.core.string.StringUtil;

public abstract class XMLSerializationHelper {

	public final static int NONE = -1;
	public final static int UTF32BE = 0;
	public final static int UTF32LE = 1;
	public final static int UTF16BE = 2;
	public final static int UTF16LE = 3;
	public final static int UTF8 = 4;

	public final static byte[] UTF32BEBOMBYTES = new byte[] { (byte) 0x00,
			(byte) 0x00, (byte) 0xFE, (byte) 0xFF, };
	public final static byte[] UTF32LEBOMBYTES = new byte[] { (byte) 0xFF,
			(byte) 0xFE, (byte) 0x00, (byte) 0x00, };
	public final static byte[] UTF16BEBOMBYTES = new byte[] { (byte) 0xFE,
			(byte) 0xFF, };
	public final static byte[] UTF16LEBOMBYTES = new byte[] { (byte) 0xFF,
			(byte) 0xFE, };
	public final static byte[] UTF8BOMBYTES = new byte[] { (byte) 0xEF,
			(byte) 0xBB, (byte) 0xBF, };

	public final static byte[][] BOMBYTES = new byte[][] { UTF32BEBOMBYTES,
			UTF32LEBOMBYTES, UTF16BEBOMBYTES, UTF16LEBOMBYTES, UTF8BOMBYTES, };

	public final static int MAXBOMBYTES = 4;// no bom sequence is longer than 4
											// byte

	private static int getBOMType(byte[] _bomBytes, int _length) {
		for (int i = 0; i < BOMBYTES.length; i++) {
			for (int j = 0; j < _length && j < BOMBYTES[i].length; j++) {
				if (_bomBytes[j] != BOMBYTES[i][j])
					break;
				if (_bomBytes[j] == BOMBYTES[i][j]
						&& j == BOMBYTES[i].length - 1)
					return i;
			}
		}
		return NONE;
	}

	private static int getSkipBytes(int BOMType) {
		if (BOMType < 0 || BOMType >= BOMBYTES.length)
			return 0;
		return BOMBYTES[BOMType].length;
	}
	public static Reader getReader(InputStream is){
		InputStream in = is; 
		if (!is.markSupported()){
			in = new ByteArrayInputStream(StringUtil.readBytes(is));
		}

		in.mark(MAXBOMBYTES + 1);
		byte[] buff = new byte[MAXBOMBYTES];
		int read;
		try {
			read = in.read(buff);
			int BOMType = getBOMType(buff, read);
			in.reset();
			in.skip(getSkipBytes(BOMType));
			
			
			String charSetName = "UTF-8";
			switch (BOMType){
				case UTF16BE:
					charSetName ="UTF-16BE";
					break;
				case UTF16LE:
					charSetName ="UTF-16LE";
					break;
				case UTF32BE:
					charSetName ="UTF-32BE";
					break;
				case UTF32LE:
					charSetName ="UTF-32LE";
					break;
			}
			return new InputStreamReader(in, charSetName);
		} catch (IOException e1) {
			throw new RuntimeException(e1);
		}
	}
	

	private static Reader getReader(File _f)  {
		try {
			return getReader(new FileInputStream(_f));
		} catch (FileNotFoundException e) {
			throw new RuntimeException(e);
		}
	}

	public static Document getDocument(File _f) {
		return getDocument(getReader(_f));
	}
	
	public static Document getDocument(InputStream is) {
		return getDocument(getReader(is));
	}
	
	public static Document getDocument(Reader reader) {
		try {
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = dbf.newDocumentBuilder();
			return builder.parse(new InputSource(reader));
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static void serialize(Node target, File file) {
		try {
			serialize(target, new FileWriter(file));
		} catch (Exception ex) {
			throw new RuntimeException(ex);
		}
	}

	private static TransformerFactory factory = TransformerFactory.newInstance();
	public static void serialize(Node target, Writer wr) {
		try {
			Transformer transformer = factory.newTransformer();
			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
			transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
			transformer.transform(new DOMSource(target), new StreamResult(wr));
		} catch (Exception exception) {
			throw new RuntimeException(exception);
		}
	}

}