package config;


import java.io.File;
import java.io.IOException;

import org.apache.log4j.Logger;
import org.ini4j.Wini;

/**
 * Represents the configuration of the client
 * 
 * @author Jonathan Bauer
 */

public class Config {

	/**
	 * Logger for this class
	 */
	private final static Logger LOGGER = Logger.getLogger(Config.class);

	/**
	 * The main configuration object is of type Wini
	 * It contains the content of the config.ini as
	 * determined in the init() function. 
	 */
	private static Wini ini = null;

	/**
	 * Initializes the class by determining the path
	 * to the config.ini on the system and setting the 
	 * private creating the ini member from that file.
	 * 
	 * This function will make a distinction between 
	 * Linux and Windows OS's, as the standard paths 
	 * for configuration files obviously differ.
	 *  
	 * @throws IOException
	 */
	public static void init() throws IOException {

		// Variables only needed locally
		String configPath = null;
		File configFile = null;

		// Determine OS
		String OSName = System.getProperty("os.name").toLowerCase();
		LOGGER.info("Machine's OS: " + OSName);
		if (OSName.contains("windows")) {
			// Windows machine. Use the environment variable 'APPDATA' which
			// should point to a path similar to:
			//		C:\Users\<user>\AppData\Roaming
			String appDataPath = System.getenv("APPDATA");
			if (!appDataPath.isEmpty()) {
				configPath = appDataPath + "\\bwSuite\\config.ini";
			} else {
				// APPDATA was empty, let's build it ourselves...
				LOGGER.warn("APPDATA ist leer.");
				configPath = System.getProperty("user.home") + "\\AppData\\Roaming\\bwSuite\\config.ini";	
			}
			
		} else if (OSName.contains("linux")) {
			configPath=System.getProperty("user.home") + "/.config/bwSuite/config.ini";
		} else {
			// Not Windows nor Linux, TODO MacOS Support?
			configPath = null;
		}
		
		// Check if we got a path
		if (!(configPath.isEmpty()||configPath == null)) {
			configFile = new File(configPath);
		} else {
			throw new IOException("Konnte keinen Pfad für die Konfigurationsdatei ermitteln.");
		}
		
		// Check if the directory exists.
		if (!configFile.getParentFile().exists()) {
			LOGGER.info("Ordner " + configFile.getParentFile() + " exisitiert nicht - lege ihn jetzt an.");
			// Does not, create it
			if (!configFile.getParentFile().mkdirs()) {
				throw new IOException("Konnte '" + configFile.getParentFile() + "' nicht erstellen.");
			}
		}
		
		// Check if the file already exists
		if (!configFile.exists()) {
			// Does not, create it
			configFile.createNewFile();

			// Check if file is writeable
			if(configFile.canWrite()) {
				ini = new Wini(configFile);
				LOGGER.info("Erzeuge '" + configFile + "'...");
				// write default configuration options and values
				ini.put("main", "BillOfRights", false);
				ini.put("main", "vmware", false);
				ini.put("main", "Benutzername speichern", false);
				ini.put("main", "Benutzername", "");
				ini.put("main", "Letzter Downloadpfad", "");
				ini.put("main", "Letzter Uploadpfad", "");
				ini.put("main", "IdP", "");
				ini.store();
				
			} else {
				throw new IOException("Konnte nicht in '" + configFile + "' schreiben. Haben Sie Rechte dazu?");
			}
		} else {
			LOGGER.info("'" + configFile + "' existiert bereits - keine weitere Aktion.");
			ini = new Wini(configFile);
		}
	} // end constructor.

	/**
	 * Query the value of 'BillOfRights' from the configuration file.
	 * @return true if the user already accepted bill of rights, false otherwise.
	 */
	public static boolean getBillOfRights() {
		return getBoolean("main", "BillOfRights", false);
	}
	/**
	 * Query the value of 'vmware' from the configuration file.
	 * @return true if the user already accepted vmware license, false otherwise.
	 */
	public static boolean getVmwareLicense() {
		return getBoolean("main", "vmware", false);
	}
	/**
	 * Query the value of 'Benutzername speichern' from the configuration file.
	 * @return true if the username should be saved, false otherwise.
	 */
	public static boolean getSaveUsername() {
		return getBoolean("main", "Benutzername speichern", false);
	}
	/**
	 * Query the value of 'Benutzername' from the configuration file.
	 * @return username if saved, an empty string otherwise.
	 */
	public static String getUsername() {
		return getString("main", "Benutzername", "");
	}
	/**
	 * Query the value of 'Letzter Downloadpfad' from the configuration file.
	 * @return last download path if saved, the path to the user's home otherwise.
	 */
	public static String getLastDownloadPath() {
		return getString("main", "Letzter Downloadpfad", System.getProperty("user.home"));
	}
	/**
	 * Query the value of 'Letzter Uploadpfad' from the configuration file.
	 * @return last upload path if saved, the path to the user's home otherwise.
	 */
	public static String getLastUploadPath() {
		return getString("main", "Letzter Uploadpfad", System.getProperty("user.home"));
	}
	
	/**
	 * Query the path of the configuration file
	 * @return path to the configuration file
	 */
	public static String getPath() {
		if (ini.getFile().getParentFile().isDirectory())
			return ini.getFile().getParentFile().toString();
		else
			return null;
	}
	/**
	 * Query the IdP of the configuration file
	 * @return stored IdP
	 */
	public static int getIdP() {
			return Integer.parseInt(getString("main", "IdP",  ""));
	}
	
	/**
	 * Sets the value of 'BillOfRights' in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setBillOfRights(boolean value) {
		return setBoolean("main", "BillOfRights", value);
	}
	/**
	 * Sets the value of 'vmware' in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setVmwareLicense(boolean value) {
		return setBoolean("main", "vmware", value);
	}
	/**
	 * Sets the value of 'Benutzername speichern' in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setSaveUsername(boolean value) {
		return setBoolean("main", "Benutzername speichern", value);
	}
	/**
	 * Sets the value of 'Benutzername' in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setUsername(String value) {
		return setString("main", "Benutzername", value);
	}
	/**
	 * Sets the value of 'Letzter Downloadpfad' in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setLastDownloadPath(String value) {
		return setString("main", "Letzter Downloadpfad", value);
	}
	/**
	 * Sets the value of "Letzter Uploadpfad" in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setLastUploadPath(String value) {
		return setString("main", "Letzter Uploadpfad", value);
	}
	/**
	 * Sets the value of "IdP" in the configuration file to 'value'
	 * @return true if it succeeded, false otherwise
	 */
	public static boolean setIdP(String value) {
		return setString("main", "IdP", value);
	}
	
	/**
	 * Save the changes to the ini file to actual file on the disk.
	 * 
	 * @return true if succeeded, false otherwise
	 */
	public static boolean store() {
		try {
			ini.store();
			return true;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
	}
	
	/**
	 * Gets the boolean from the given 'key' in the given 'section'.
	 * If nothing is found, return the given 'defaultValue'
	 *  
	 * @param section section to search the key in
	 * @param key key to query in that section
	 * @param defaultValue default value to be returned, if none is found.
	 * @return 
	 */
	private static boolean getBoolean(String section, String key, Boolean defaultValue) {
		if (ini.containsKey(section) && ini.get(section).containsKey(key)) {
			return ini.get(section, key, Boolean.class);
		} else {
			return defaultValue;
		}
	}
	
	/**
	 * Gets the string from the given 'key' in the given 'section'
	 * If nothing is found, return the given 'defaultValue'
	 * 
	 * @param section section of the configuration file to search for 
	 * @param key key to lookup in the section
	 * @param defaultValue default value to return if none is found in the file
	 * @return value of 'key' in 'section' if it exists, 'defaultValue' otherwise
	 */
	private static String getString(String section, String key, String defaultValue) {
		if (ini.containsKey(section) && ini.get(section).containsKey(key)) {
			return ini.get(section, key);
		} else {
			return defaultValue;
		}
	}
	/**
	 * Sets the given 'key' in the given 'section' to 'value'.
	 * Restricted to boolean.
	 *  
	 * @param section section of the configuration file 
	 * @param key key to set
	 * @param value value to assign to key
	 * @return true if it succeeded, false otherwise
	 */
	private static boolean setBoolean(String section, String key, boolean value) {
		return ini.put(section, key, value) != null;
	}
	
	/**
	 * Sets the given 'key' in the given 'section' to 'value'.
	 * Restricted to string.
	 *  
	 * @param section section of the configuration file 
	 * @param key key to set
	 * @param value value to assign to key
	 * @return true if it succeeded, false otherwise
	 */
	private static boolean setString(String section, String key, String value) {
		return ini.put(section, key, value) != null;
	}
}