package filesystem;
import java.io.File;
import java.util.ArrayList;

/**
 * 
 * @author ablackbu
 *
 */
public class FSInfo {
	
	//singelton
	private static FSInfo instance;
	
	// User's home directory.
	private String homeDir;

	// Current working directory
	private String currentWorkingDir;

	// user name
	private String userName;

	// operating system name
	private String operatingSys;

	// temporary directory
	private String tempDir;

	// the java class path
	private String classPath;
	
	//the list of sub directories in the - including hidden files
	private ArrayList<File> subDirs;
	
	//the list of all files in the directory - including hidden files
	private ArrayList<File> files;
	
	//the list of sub directories in the - excluding hidden files
	private ArrayList<File> nonHiddenSubDirs;
	
	//the list of sub directories in the - excluding hidden files
	private ArrayList<File> nonHiddenFiles;
	
	// the current file or directory
	//File file;
	
	private FSInfo() {
		homeDir = System.getProperty("user.home");
		currentWorkingDir = System.getProperty("user.dir");
		userName = System.getProperty("user.name");
		operatingSys = System.getProperty("os.name");
		tempDir = System.getProperty("java.io.tmpdir");
		classPath = System.getProperty("java.class.path");
		subDirs = new ArrayList<File>();
		files = new ArrayList<File>();
		nonHiddenSubDirs = new ArrayList<File>();
		nonHiddenFiles = new ArrayList<File>();
		
		switchDir(homeDir);
	}
	
	/**
	 * Public access for the singleton.
	 * 
	 * @return the singleton object.
	 */
	public static FSInfo getInstance() {
		if (instance == null) {
			instance = new FSInfo();
		}
		return instance;
	}
	
	/**
	 * 
	 * @param newDir
	 */
	public void switchDir(String newDir) {
		File file = new File(newDir);
		File[] f =  file.listFiles();
		for(int i = 0; i < f.length; ++i) {
			if(f[i].isFile()) {
				files.add(f[i]);
				if(!f[i].isHidden()) {
					nonHiddenFiles.add(f[i]);
				}
			}
			else {
				subDirs.add(f[i]);
				if(!f[i].isHidden()) {
					nonHiddenSubDirs.add(f[i]);
				}
			}		
		}
	}
	
	public ArrayList<File> getSubDirs() {
		return subDirs;
	}
	
	public ArrayList<File> getNonHiddenSubDirs() {
		return nonHiddenSubDirs;
	}
	
	public ArrayList<File> getFiles() {
		return files;
	}
	
	public ArrayList<File> getNonHiddenFiles() {
		return nonHiddenFiles;
	}
	
	public String getOS() {
		return operatingSys;
	}
	
	public String getClasspath() {
		return classPath;
	}
	
	public String getTempDir() {
		return tempDir;
	}
	
	public String getUserName() {
		return userName;
	}
	
	public String getCurrentWorkingDir() {
		return currentWorkingDir;
	}
	
	public String getHomeDir() {
		return homeDir;
	}
}