/*********************************************************************************************************************************
 * Autorskie Prawa Majątkowe - Moose Spółka z ograniczoną odpowiedzialnością
 * Copyright 2019 Moose Spółka z ograniczoną odpowiedzialnością
 ********************************************************************************************************************************/

package eu.mooseinc.documents.explorer;

import org.apache.log4j.Logger;

import javax.annotation.PostConstruct;
import javax.faces.bean.ApplicationScoped;
import javax.faces.bean.ManagedBean;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.nio.file.Paths;
import java.text.MessageFormat;
import java.util.Properties;

/**
 * Bean used for application initialization.
 */
@ApplicationScoped
@ManagedBean(eager = true, name = "applicationBean")
public class ApplicationBean {
	
	private static final Logger logger = Logger.getLogger( ApplicationBean.class );
	
	/**
	 * Path to user configuration.
	 */
	private static final String CUSTOM_PROPERTIES_PATH = "/opt/documents-explorer/application.properties";

	/**
	 * The path to the directory used to store documents.
	 */
	private String documentsDirectory;

	/**
	 * Reads the configuration from the configuration file.
	 */
	@PostConstruct
	public void readProperties() {
		Properties properties = new Properties(  );
		properties.putAll( loadDefaultProperties() );
		properties.putAll( loadCustomProperties() );

		final String directoryPath = properties.getProperty("documents.directory");
		final File directory = Paths.get(directoryPath).toFile();
		if (!directory.exists()) {
			if (!directory.mkdirs()) {
				logger.error( "Create directory error" );
				documentsDirectory = "";
			}
		}
		else
			documentsDirectory = directoryPath;

		logger.info(MessageFormat.format("Using the {0} directory for file storing.", documentsDirectory));
	}
	
	/**
	 * Load custom properties.
	 *
	 * @return properties.
	 */
	private Properties loadCustomProperties() {
		try (InputStream in = new FileInputStream( CUSTOM_PROPERTIES_PATH )) {
			final Properties properties = new Properties(  );
			properties.load( in );
			return properties;
		}
		catch (Exception e) {
			logger.error( "The application encountered an error while loading the custom properties.", e );
			return new Properties(  );
		}
	}
	
	/**
	 * Load default properties.
	 *
	 * @return properties.
	 */
	private Properties loadDefaultProperties() {
		try (InputStream in = getClass().getClassLoader().getResourceAsStream("application.properties")) {
			final Properties properties = new Properties(  );
			properties.load( in );
			return properties;
		}
		catch (Exception e) {
			logger.error( "The application encountered an error while loading the default properties.", e );
			return new Properties(  );
		}
	}

	/**
	 * @return Path to the directory with files.
	 */
	public String getDocumentsDirectory() {
		return documentsDirectory;
	}
}