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package com.webapp.utils.file;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

import com.webapp.utils.string.Utils.Charsets;

public final class EncodeUtils {

	/* --------------------- decode ---------------------- */

	// ByteBuffer to String by charsetName
	public static String decode(ByteBuffer buffer, String charsetName) { // root
		return Charset.forName(charsetName)
				.decode((ByteBuffer) buffer.rewind()).toString();
	}

	public static String decode(ByteBuffer buffer) {
		return decode(buffer, Charsets.uft8);
	}

	// String to String by charsetName
	public static String decode(String str) {
		return decode(str, Charsets.uft8);
	}

	public static String decode(String str, String charsetName) {
		return decode(ByteBuffer.wrap(str.getBytes()), charsetName);
	}

	// CharBuffer to String by charsetName
	public static String decode(CharBuffer buffer) {
		return decode(buffer, Charsets.uft8);
	}

	public static String decode(CharBuffer buffer, String charsetName) {
		return decode(buffer.toString());
	}

	// CharBuffer to String by charsetName
	public static String decode(byte[] byteArray) {
		return decode(ByteBuffer.wrap(byteArray), Charsets.uft8);
	}

	public static String decode(byte[] byteArray, String charsetName) {
		return decode(ByteBuffer.wrap(byteArray), charsetName);
	}

	/* --------------------- encode ---------------------- */

	// String to ByteBuffer by charsetName
	public static ByteBuffer encode(String str) {
		return encode(str, Charsets.uft8);
	}

	public static ByteBuffer encode(String str, String charsetName) {
		return Charset.forName(charsetName).encode(str);
	}

	/**
	 * CharBuffer to ByteBuffer by UTF-8 encode
	 *
	 * @param buffer
	 *            CharBuffer type
	 * @return ByteBuffer of by UTF-8 encode
	 */
	public static ByteBuffer encode(CharBuffer buffer) {
		return encode(buffer, Charsets.uft8);
	}

	/**
	 * CharBuffer to ByteBuffer by charsetName encode
	 *
	 * @param buffer
	 *            CharBuffer type
	 * @param charsetName
	 *            encode name
	 * @return ByteBuffer of by charsetName encode
	 */
	public static ByteBuffer encode(CharBuffer buffer, String charsetName) {
		return Charset.forName(charsetName)
				.encode((CharBuffer) buffer.rewind());
	}

	/**
	 * byte[] to ByteBuffer by UTF-8 encode
	 *
	 * @param byteArray
	 *            byte[] type
	 * @return ByteBuffer of by UTF-8 encode
	 */
	public static ByteBuffer encode(byte[] byteArray) {
		return ByteBuffer.wrap(byteArray);
	}

	public static byte[] encodeByte(ByteBuffer buffer) {
		return decode(buffer).getBytes();
	}

	public static Charset getUTFCharset() {
		return StandardCharsets.UTF_8;
	}

	public static Charset getDefaultCharset() {
		return Charset.defaultCharset();
	}

	/** Prevent instantiation */
	private EncodeUtils() {
	}

}