package at.knowcenter.wag.egov.egiz.ldap.client;

import iaik.asn1.structures.Name;
import iaik.utils.RFC2253NameParser;
import iaik.utils.RFC2253NameParserException;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;

import org.apache.log4j.Logger;

/**
 * @author <a href="mailto:thomas.knall@iaik.tugraz.at">Thomas Knall</a>
 */
public class LDAPMapping {
	
	// constants
	public static final String PROPERTIES_KEY_ISSUER_NAME      = "issuer.name";
	public static final String PROPERTIES_KEY_LDAP_URL         = "ldap.url";
	public static final String PROPERTIES_KEY_SERIAL_ATTR_NAME = "serialnumber.attrname";
	
	private final Logger log = Logger.getLogger(getClass());
	private static final iaik.x509.net.ldap.Handler LDAP_HANDLER;
	
	// fields
	private Name issuerName;
	private URL ldapURL;
	private String serialNumberAttrName;
	
	// static initialization
	static {
		LDAP_HANDLER = new iaik.x509.net.ldap.Handler();
	}

	// constructors
	protected LDAPMapping() {
		this.setSerialNumberAttrName(LDAPClientImpl.DEFAULT_LDAP_ATTR_SERIAL_NUMBER);
	}
	
	public LDAPMapping(Name issuerName, URL ldapURL) {
		this(issuerName, ldapURL, null);
	}
	
	public LDAPMapping(Name issuerName, URL ldapURL, String serialNumberAttrName) {
		this();
		this.setIssuerName(issuerName);
		this.setLdapURL(ldapURL);
		this.setSerialNumberAttrName(serialNumberAttrName);
	}
	
	public LDAPMapping(String issuerNameString, String ldapURLString) throws LDAPException {
		this(issuerNameString, ldapURLString, null);
	}
	
	public LDAPMapping(String issuerNameString, String ldapURLString, String serialNumberAttrName) throws LDAPException {
		this();
		this.setIssuerName(issuerNameString);
		this.setLdapURL(ldapURLString);
		this.setSerialNumberAttrName(serialNumberAttrName);
	}
	
	public LDAPMapping(Properties properties) throws LDAPException {
		this();
		if (properties == null) {
			throw new NullPointerException("Properties must not be null.");
		}
		String in = properties.getProperty(PROPERTIES_KEY_ISSUER_NAME);
		String sn = properties.getProperty(PROPERTIES_KEY_LDAP_URL);
		String snan = properties.getProperty(PROPERTIES_KEY_SERIAL_ATTR_NAME);
		if (in == null || in.length() == 0) {
			throw new LDAPException("Property \"" + PROPERTIES_KEY_ISSUER_NAME + "\" must not be null or empty.");
		}
		if (sn == null || sn.length() == 0) {
			throw new LDAPException("Property \"" + PROPERTIES_KEY_LDAP_URL + "\" must not be null or empty.");
		}
		this.setIssuerName(in);
		this.setLdapURL(sn);
		this.setSerialNumberAttrName(snan);
	}
	
	// getter/setter
	public Name getIssuerName() {
		return this.issuerName;
	}

	public void setIssuerName(Name issuerName) {
		if (issuerName == null) {
			throw new NullPointerException("Issuer name must not be null.");
		}
		this.issuerName = issuerName;
	}

	public void setIssuerName(String issuerNameString) throws LDAPException {
		RFC2253NameParser parser = new RFC2253NameParser(issuerNameString.trim());
		try {
			this.setIssuerName(parser.parse());
		} catch (RFC2253NameParserException e) {
			throw new LDAPException(e);
		}
	}

	public URL getLdapURL() {
		return this.ldapURL;
	}

	public void setLdapURL(URL ldapURL) {
		if (ldapURL == null) {
			throw new NullPointerException("LDAP url must not be null.");
		}
		this.ldapURL = ldapURL;
	}

	public void setLdapURL(String ldapURLString) throws LDAPException {
		try {
			this.setLdapURL(new URL(null, ldapURLString.trim(), LDAP_HANDLER));
		} catch (MalformedURLException e) {
			throw new LDAPException(e);
		}
	}

	public String getSerialNumberAttrName() {
		return this.serialNumberAttrName;
	}

	public void setSerialNumberAttrName(String serialNumberAttrName) {
		if (serialNumberAttrName != null && serialNumberAttrName.length() == 0) {
			throw new IllegalArgumentException("Serial number attribute name must not be empty");
		}
		this.serialNumberAttrName = serialNumberAttrName != null ? serialNumberAttrName.trim() : LDAPClientImpl.DEFAULT_LDAP_ATTR_SERIAL_NUMBER;
	}

	// misc
	public void validateData() throws LDAPException {
		if (this.issuerName == null) {
			throw new LDAPException("Issuer name must not be null.");
		}
		if (this.ldapURL == null) {
			throw new LDAPException("LDAP url must not be null.");
		}
		if (serialNumberAttrName == null || serialNumberAttrName.length() == 0) {
			throw new LDAPException("Serial number attribute name must not be null or empty");
		}
	}

	@Override
	public String toString() {
		StringBuffer buffer = new StringBuffer();
		buffer.append("issuerName = ").append(this.issuerName != null ? this.issuerName.getName() : null);
		buffer.append(", ldapURL = ").append(this.ldapURL);
		buffer.append(", serialNumberAttrName = ").append(this.serialNumberAttrName);
		return buffer.toString();
	}

}