package at.gv.egiz.eaaf.modules.auth.sl20;

import java.util.Arrays;
import java.util.List;

import javax.annotation.PostConstruct;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import at.gv.egiz.eaaf.core.api.data.EAAFConstants;
import at.gv.egiz.eaaf.core.api.idp.IConfiguration;
import at.gv.egiz.eaaf.core.api.idp.ISPConfiguration;
import at.gv.egiz.eaaf.core.api.idp.auth.modules.AuthModule;
import at.gv.egiz.eaaf.core.api.idp.process.ExecutionContext;
import at.gv.egiz.eaaf.core.impl.idp.auth.AbstractAuthenticationManager;
import at.gv.egiz.eaaf.modules.auth.sl20.utils.SL20Constants;


/**
 * @author tlenz
 *
 */
public abstract class AbstractSL20AuthenticationModulImpl implements AuthModule {	
	private static final Logger log = LoggerFactory.getLogger(AbstractSL20AuthenticationModulImpl.class);
	
	private int priority = 3;
	public static final List<String> VDA_TYPE_IDS = Arrays.asList("1", "2", "3", "4");
		
	@Autowired(required=true) protected IConfiguration authConfig;
	@Autowired(required=true) private AbstractAuthenticationManager authManager;
	
	@Override
	public int getPriority() { 
		return priority; 
	}

	/**
	 * Sets the priority of this module. Default value is {@code 0}.
	 * @param priority The priority.
	 */
	public void setPriority(int priority) {
		this.priority = priority;
	}

	@PostConstruct
	protected void initalSL20Authentication() {
		//parameter to whiteList
		authManager.addHeaderNameToWhiteList(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE);
		authManager.addHeaderNameToWhiteList(SL20Constants.HTTP_HEADER_SL20_VDA_TYPE);
		
	}
	
	
	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.auth.modules.AuthModule#selectProcess(at.gv.egovernment.moa.id.process.api.ExecutionContext)
	 */
	@Override
	public String selectProcess(ExecutionContext context) {
		final ISPConfiguration spConfig = (ISPConfiguration) context.get(EAAFConstants.PROCESSCONTEXT_SP_CONFIG);
		
		final String sl20ClientTypeHeader = (String) context.get(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE.toLowerCase());
		final String sl20VDATypeHeader = (String)  context.get(SL20Constants.HTTP_HEADER_SL20_VDA_TYPE.toLowerCase());
		
		if (spConfig != null && 
				StringUtils.isNotEmpty(spConfig.getConfigurationValue(getConfigPropertyNameEnableModule())) &&
					Boolean.valueOf(spConfig.getConfigurationValue(getConfigPropertyNameEnableModule()))) {
			log.debug("SL2.0 is enabled for " + spConfig.getUniqueIdentifier());
			log.trace(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE +  ": " + sl20ClientTypeHeader);			
			log.trace(SL20Constants.HTTP_HEADER_SL20_VDA_TYPE +  ": " + sl20VDATypeHeader);
			return getProcessName();
			
		} else {
			log.trace("SL2.0 is NOT enabled for " + spConfig.getUniqueIdentifier());
			return null;
			
		}
						
	}

	/**
	 * Get the SP specific configuration-key that holds the enabled key for this authentication module 
	 * 
	 * @return configuration key for SP configuration
	 */
	public abstract String getConfigPropertyNameEnableModule();
	
	/**
	 * Get the name of this specific SL2.0 process
	 * 
	 * @return
	 */
	public abstract String getProcessName();
	
	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.auth.modules.AuthModule#getProcessDefinitions()
	 */
	@Override
	public abstract String[] getProcessDefinitions();

}