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package java.util.logging;

import java.text.MessageFormat;
import java.util.Date;
import java.util.ResourceBundle;

public class XMLFormatter extends Formatter {
	private static final String indent = "    ";

	public XMLFormatter() {
	}

	@Override
	public String format(LogRecord r) {
		// call a method of LogRecord to ensure not null
		long time = r.getMillis();
		// format to date
		String date = MessageFormat.format("{0, date} {0, time}", new Object[]{new Date(time)});
		String nl = System.lineSeparator();

		StringBuilder sb = new StringBuilder();
		sb.append("").append(nl);
		append(sb, 1, "date", date);
		append(sb, 1, "millis", time);
		append(sb, 1, "sequence", r.getSequenceNumber());
		if (r.getLoggerName() != null) append(sb, 1, "logger", r.getLoggerName());
		append(sb, 1, "level", r.getLevel().getName());
		if (r.getSourceClassName() != null) append(sb, 1, "class", r.getSourceClassName());
		if (r.getSourceMethodName() != null) append(sb, 1, "method", r.getSourceMethodName());
		append(sb, 1, "thread", r.getThreadID());
		formatMessages(r, sb);
		Object[] params = r.getParameters();
		if (params != null) for (Object element : params) append(sb, 1, "param", element);
		formatThrowable(r, sb);
		sb.append("").append(nl);
		return sb.toString();
	}

	private void formatMessages(LogRecord r, StringBuilder sb) {
		// get localized message if has, but don't call Formatter.formatMessage
		// to parse pattern string
		ResourceBundle rb = r.getResourceBundle();
		String pattern = r.getMessage();
		if (rb != null && pattern != null) {
			String message;
			try {
				message = rb.getString(pattern);
			} catch (Exception e) {
				message = null;
			}

			if (message == null) {
				message = pattern;
				append(sb, 1, "message", message);
			} else {
				append(sb, 1, "message", message);
				append(sb, 1, "key", pattern);
				append(sb, 1, "catalog", r.getResourceBundleName());
			}
		} else if (pattern != null) {
			append(sb, 1, "message", pattern);
		} else {
			sb.append(indent).append("");
		}
	}

	private void formatThrowable(LogRecord r, StringBuilder sb) {
		Throwable t;
		if ((t = r.getThrown()) != null) {
			String nl = System.lineSeparator();
			sb.append(indent).append("").append(nl);
			append(sb, 2, "message", t.toString());
			// format throwable's stack trace
			StackTraceElement[] elements = t.getStackTrace();
			for (StackTraceElement e : elements) {
				sb.append(indent).append(indent).append("").append(nl);
				append(sb, 3, "class", e.getClassName());
				append(sb, 3, "method", e.getMethodName());
				append(sb, 3, "line", e.getLineNumber());
				sb.append(indent).append(indent).append("").append(nl);
			}
			sb.append(indent).append("").append(nl);
		}
	}

	private static void append(StringBuilder sb, int indentCount, String tag, Object value) {
		for (int i = 0; i < indentCount; ++i) sb.append(indent);
		sb.append("<").append(tag).append(">");
		sb.append(value);
		sb.append("");
		sb.append(System.lineSeparator());
	}

	@Override
	public String getHead(Handler h) {
		String encoding = null;
		if (h != null) encoding = h.getEncoding();
		if (encoding == null) encoding = System.getProperty("file.encoding");
		StringBuilder sb = new StringBuilder();
		sb.append("");
		sb.append(System.lineSeparator());
		sb.append("");
		sb.append(System.lineSeparator());
		sb.append("");
		return sb.toString();
	}

	@Override
	public String getTail(Handler h) {
		return "";
	}
}