/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.portlets.login;

import java.util.Collections;
import java.util.Map;
import javax.annotation.Resource;
import javax.portlet.PortletRequest;
import javax.portlet.PortletSession;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.lang.Validate;
import org.apereo.portal.IUserProfile;
import org.apereo.portal.layout.profile.SessionAttributeProfileMapperImpl;
import org.apereo.portal.url.IPortalRequestUtils;
import org.apereo.portal.user.IUserInstance;
import org.apereo.portal.user.IUserInstanceManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.stereotype.Service;

/**
 * Helper methods for the login portlet webflow.
 *
 */
@Service
public class LoginPortletHelper {

    private IUserInstanceManager userInstanceManager;

    @Autowired(required = true)
    public void setUserInstanceManager(IUserInstanceManager userInstanceManager) {
        Validate.notNull(userInstanceManager);
        this.userInstanceManager = userInstanceManager;
    }

    private IPortalRequestUtils portalRequestUtils;

    /** @param portalRequestUtils the portalRequestUtils to set */
    @Autowired(required = true)
    public void setPortalRequestUtils(IPortalRequestUtils portalRequestUtils) {
        Validate.notNull(portalRequestUtils);
        this.portalRequestUtils = portalRequestUtils;
    }

    private Map<String, String> mappings = Collections.<String, String>emptyMap();

    @Required
    @Resource(name = "profileKeyMappings")
    public void setProfileMappings(Map<String, String> mappings) {
        Validate.notNull(mappings);
        this.mappings = mappings;
    }

    /**
     * Get the profile that should be pre-selected in the local login form.
     *
     * @param request
     * @return
     */
    public String getSelectedProfile(PortletRequest request) {

        // if a profile selection exists in the session, use it
        final PortletSession session = request.getPortletSession();
        String profileName =
                (String)
                        session.getAttribute(
                                SessionAttributeProfileMapperImpl.DEFAULT_SESSION_ATTRIBUTE_NAME,
                                PortletSession.APPLICATION_SCOPE);

        // otherwise, set the selected profile to the one currently in use by
        // the user
        if (profileName == null) {
            // get the profile for the current request
            final HttpServletRequest httpServletRequest =
                    portalRequestUtils.getPortletHttpRequest(request);
            final IUserInstance ui = userInstanceManager.getUserInstance(httpServletRequest);
            final IUserProfile profile = ui.getPreferencesManager().getUserProfile();

            // check to see if the profile's fname matches one of the entries in
            // the profile key map used by the session attribute profile mapper
            for (Map.Entry<String, String> entry : mappings.entrySet()) {
                if (entry.getValue().equals(profile.getProfileFname())) {
                    profileName = entry.getKey();
                    break;
                }
            }
        }

        return profileName;
    }
}