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package java.util.logging;

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.Objects;

public class StreamHandler extends Handler {
	private OutputStream os;
	private Writer writer;
	private boolean writerNotInitialized;

	public StreamHandler() {
		initProperties("INFO", null, "java.util.logging.SimpleFormatter", null);
		this.os = null;
		this.writer = null;
		this.writerNotInitialized = true;
	}

	StreamHandler(OutputStream os) {
		this();
		this.os = os;
	}

	StreamHandler(String defaultLevel, String defaultFilter, String defaultFormatter, String defaultEncoding) {
		initProperties(defaultLevel, defaultFilter, defaultFormatter, defaultEncoding);
		this.os = null;
		this.writer = null;
		this.writerNotInitialized = true;
	}

	public StreamHandler(OutputStream os, Formatter formatter) {
		this();
		if (os == null) {
			throw new NullPointerException("os == null");
		}
		if (formatter == null) {
			throw new NullPointerException("formatter == null");
		}
		this.os = os;
		internalSetFormatter(formatter);
	}

	private void initializeWriter() {
		this.writerNotInitialized = false;
		if (getEncoding() == null) {
			this.writer = new OutputStreamWriter(this.os);
		} else {
			try {
				this.writer = new OutputStreamWriter(this.os, getEncoding());
			} catch (UnsupportedEncodingException e) {
			}
		}
		write(getFormatter().getHead(this));
	}

	private void write(String s) {
		try {
			this.writer.write(s);
		} catch (Exception e) {
			getErrorManager().error("Exception occurred when writing to the output stream", e, ErrorManager.WRITE_FAILURE);
		}
	}

	void internalSetOutputStream(OutputStream newOs) {
		this.os = newOs;
	}

	protected void setOutputStream(OutputStream os) {
		Objects.requireNonNull(os, "os == null");
		LogManager.getLogManager().checkAccess();
		close(true);
		this.writer = null;
		this.os = os;
		this.writerNotInitialized = true;
	}

	@Override
	public void setEncoding(String charsetName) throws UnsupportedEncodingException {
		// Flush any existing data first.
		this.flush();
		super.setEncoding(charsetName);
		// renew writer only if the writer exists
		if (this.writer != null) {
			if (getEncoding() == null) {
				this.writer = new OutputStreamWriter(this.os);
			} else {
				try {
					this.writer = new OutputStreamWriter(this.os, getEncoding());
				} catch (UnsupportedEncodingException e) {
					throw new AssertionError(e);
				}
			}
		}
	}

	void close(boolean closeStream) {
		if (this.os != null) {
			if (this.writerNotInitialized) {
				initializeWriter();
			}
			write(getFormatter().getTail(this));
			try {
				this.writer.flush();
				if (closeStream) {
					this.writer.close();
					this.writer = null;
					this.os = null;
				}
			} catch (Exception e) {
				getErrorManager().error("Exception occurred when closing the output stream", e,
					ErrorManager.CLOSE_FAILURE);
			}
		}
	}

	@Override
	public void close() {
		LogManager.getLogManager().checkAccess();
		close(true);
	}

	@Override
	public void flush() {
		if (this.os != null) {
			try {
				if (this.writer != null) {
					this.writer.flush();
				} else {
					this.os.flush();
				}
			} catch (Exception e) {
				getErrorManager().error("Exception occurred when flushing the output stream",
					e, ErrorManager.FLUSH_FAILURE);
			}
		}
	}

	@Override
	public synchronized void publish(LogRecord record) {
		try {
			if (this.isLoggable(record)) {
				if (this.writerNotInitialized) initializeWriter();
				String msg = null;
				try {
					msg = getFormatter().format(record);
				} catch (Exception e) {
					getErrorManager().error("Exception occurred when formatting the log record",
						e, ErrorManager.FORMAT_FAILURE);
				}
				write(msg);
			}
		} catch (Exception e) {
			getErrorManager().error("Exception occurred when logging the record", e,
				ErrorManager.GENERIC_FAILURE);
		}
	}

	@Override
	public boolean isLoggable(LogRecord record) {
		if (record == null) return false;
		if (this.os != null && super.isLoggable(record)) return true;
		return false;
	}
}