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package com.orientechnologies.common.io;

import java.io.ByteArrayOutputStream;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Locale;

public class OIOUtils {
	public static final long	SECOND	= 1000;
	public static final long	MINUTE	= SECOND * 60;
	public static final long	HOUR		= MINUTE * 60;
	public static final long	DAY			= HOUR * 24;
	public static final long	YEAR		= DAY * 365;
	public static final long	WEEK		= DAY * 7;

	public static byte[] toStream(Externalizable iSource) throws IOException {
		final ByteArrayOutputStream stream = new ByteArrayOutputStream();
		final ObjectOutputStream oos = new ObjectOutputStream(stream);
		iSource.writeExternal(oos);
		oos.flush();
		stream.flush();
		return stream.toByteArray();
	}

	public static long getTimeAsMillisecs(final Object iSize) {
		if (iSize == null)
			throw new IllegalArgumentException("Time is null");

		if (iSize instanceof Number)
			// MILLISECS
			return ((Number) iSize).longValue();

		String time = iSize.toString();

		boolean number = true;
		for (int i = time.length() - 1; i >= 0; --i) {
			if (!Character.isDigit(time.charAt(i))) {
				number = false;
				break;
			}
		}

		if (number)
			// MILLISECS
			return Long.parseLong(time);
		else {
			time = time.toUpperCase(Locale.ENGLISH);

			int pos = time.indexOf("MS");
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos));

			pos = time.indexOf("S");
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * SECOND;

			pos = time.indexOf("M");
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * MINUTE;

			pos = time.indexOf("H");
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * HOUR;

			pos = time.indexOf("D");
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * DAY;

			pos = time.indexOf('W');
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * WEEK;

			pos = time.indexOf('Y');
			if (pos > -1)
				return Long.parseLong(time.substring(0, pos)) * YEAR;

			// RE-THROW THE EXCEPTION
			throw new IllegalArgumentException("Time '" + time + "' has a unrecognizable format");
		}
	}

	public static String getTimeAsString(final long iTime) {
		if (iTime > YEAR && iTime % YEAR == 0)
			return String.format("%dy", iTime / YEAR);
		if (iTime > WEEK && iTime % WEEK == 0)
			return String.format("%dw", iTime / WEEK);
		if (iTime > DAY && iTime % DAY == 0)
			return String.format("%dd", iTime / DAY);
		if (iTime > HOUR && iTime % HOUR == 0)
			return String.format("%dh", iTime / HOUR);
		if (iTime > MINUTE && iTime % MINUTE == 0)
			return String.format("%dm", iTime / MINUTE);
		if (iTime > SECOND && iTime % SECOND == 0)
			return String.format("%ds", iTime / SECOND);

		// MILLISECONDS
		return String.format("%dms", iTime);
	}
}