package gov.hhs.fha.nhinc.connectmgr;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import gov.hhs.fha.nhinc.properties.PropertyAccessor;

import gov.hhs.fha.nhinc.connectmgr.data.CMEprInfo;

/**
 * This class has utilities for constructing the information needed for an endpoint reference
 * object.  It retrieves the information based on a uniform service name from the
 * connectionsEPR.properties file.
 * 
 * @author Les Westberg
 */
public class CMEprUtil
{
    private static Log log = LogFactory.getLog(CMEprUtil.class);
    private static final String EPR_PROPERTY_FILE_NAME = "connectionEPR";
    private static final String EPR_NAMESPACE_URI = "NamespaceURI";
    private static final String EPR_PORT_NAME = "PortName";
    private static final String EPR_SERVICE_NAME = "ServiceName";
    private static final String EPR_NAMESPACE_PREFIX = "NamespacePrefix";

    
    /**
     * This method returns specific EPR data about a service.  The information is
     * in the connectionEPR.properties file.  
     * 
     * @param sServiceName The Uniform Service name - this is used as a key to the properties in 
     *                     the property file that are specific to this service.
     * @param sEPRKey The specific key that is being wanted.
     * @return The value of that key for that service.
     * @throws ConnectionManagerException 
     */
    public static String getServiceSpecificEPRInfo(String sServiceName, String sEPRKey)
        throws ConnectionManagerException
    {
        String sKey = sServiceName + "." + sEPRKey;
        String sValue = "";
        try
        {
            sValue = PropertyAccessor.getProperty(EPR_PROPERTY_FILE_NAME, sKey);
        }
        catch (Exception e)
        {
            String sErrorMessage = "Failed to retrieve property: '" + sKey + "' from " + 
                                   EPR_PROPERTY_FILE_NAME + ".properties file.  Exception: " +
                                   e.getMessage();
            log.error(sErrorMessage, e);
            throw new ConnectionManagerException(sErrorMessage, e);
        }
        if (sValue == null)
        {
            sValue = "";
        }
        
        return sValue;
    }

    /**
     * This method creates an endpoint for the given service name and URL.
     * 
     * @param sUniformServiceName The service name for the service.
     * @return The Endpoint reference to be returned.
     * @throws ConnectionManagerException 
     */
    public static CMEprInfo createEPR(String sUniformServiceName)
        throws ConnectionManagerException
    {
        if ((sUniformServiceName == null) || (sUniformServiceName.length() <= 0))
        {
            return null;
        }
        
        CMEprInfo oEpr = new CMEprInfo();

        oEpr.setUniformServiceName(sUniformServiceName);
        oEpr.setNamespacePrefix(getServiceSpecificEPRInfo(sUniformServiceName, EPR_NAMESPACE_PREFIX));
        oEpr.setNamespaceURI(getServiceSpecificEPRInfo(sUniformServiceName, EPR_NAMESPACE_URI));
        oEpr.setPortName(getServiceSpecificEPRInfo(sUniformServiceName, EPR_PORT_NAME));
        oEpr.setServiceName(getServiceSpecificEPRInfo(sUniformServiceName, EPR_SERVICE_NAME));

        return oEpr;
    }
    
}