/**
 * Copyright 2005-2018 The Kuali Foundation
 *
 * Licensed under the Educational Community 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
 *
 * http://www.opensource.org/licenses/ecl2.php
 *
 * 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.kuali.rice.kew.actionlist.web;

import org.apache.commons.lang.StringUtils;
import org.apache.http.client.utils.URIBuilder;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionRedirect;
import org.kuali.rice.core.api.util.ConcreteKeyValue;
import org.kuali.rice.core.api.util.KeyValue;
import org.kuali.rice.kew.actionlist.ActionListFilter;
import org.kuali.rice.kew.actionlist.service.ActionListService;
import org.kuali.rice.kew.api.KewApiConstants;
import org.kuali.rice.kew.api.KewApiServiceLocator;
import org.kuali.rice.kew.api.preferences.Preferences;
import org.kuali.rice.kew.api.preferences.PreferencesService;
import org.kuali.rice.kew.service.KEWServiceLocator;
import org.kuali.rice.kim.api.group.Group;
import org.kuali.rice.kim.api.services.KimApiServiceLocator;
import org.kuali.rice.kns.web.struts.action.KualiAction;
import org.kuali.rice.krad.UserSession;
import org.kuali.rice.krad.util.GlobalVariables;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;


/**
 * Action for Action List Filter page.
 *
 * @author Kuali Rice Team (rice.collab@kuali.org)
 */
public class ActionListFilterAction extends KualiAction {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        request.setAttribute("Constants", getServlet().getServletContext().getAttribute("KewApiConstants"));
        request.setAttribute("preferences", this.getUserSession().retrieveObject(KewApiConstants.PREFERENCES));
        initForm(request, form);
        return super.execute(mapping, form, request, response);
    }

    @Override
    protected String getReturnLocation(HttpServletRequest request,
                                       ActionMapping mapping)
    {
        String mappingPath = mapping.getPath();
        String basePath = getApplicationBaseUrl();
        return basePath + KewApiConstants.WEBAPP_DIRECTORY + mappingPath + ".do";
    }

    public ActionForward start(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        ActionListFilterForm filterForm = (ActionListFilterForm) form;
        final UserSession uSession = getUserSession();
        final ActionListFilter filter = (ActionListFilter) uSession.retrieveObject(KewApiConstants.ACTION_LIST_FILTER_ATTR_NAME);
        if (filter != null) {
            if (filterForm.getDocTypeFullName() != null && ! "".equals(filterForm.getDocTypeFullName())) {
                filter.setDocumentType(filterForm.getDocTypeFullName());
                uSession.addObject(KewApiConstants.ACTION_LIST_FILTER_ATTR_NAME, filter);
                filterForm.setFilter(filter);
            } else {
                filterForm.setFilter(filter);
                filterForm.setDocTypeFullName(filter.getDocumentType());
            }
        }
        return mapping.findForward("viewFilter");
    }

    public ActionForward filter(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        ActionListFilterForm filterForm = (ActionListFilterForm) form;
        //validate the filter through the actionitem/actionlist service (I'm thinking actionlistservice)
        final UserSession uSession = getUserSession();
        ActionListFilter alFilter = filterForm.getLoadedFilter();
        if (StringUtils.isNotBlank(alFilter.getDelegatorId()) && !KewApiConstants.DELEGATION_DEFAULT.equals(alFilter.getDelegatorId()) &&
                StringUtils.isNotBlank(alFilter.getPrimaryDelegateId()) && !KewApiConstants.PRIMARY_DELEGATION_DEFAULT.equals(alFilter.getPrimaryDelegateId())){
            // If the primary and secondary delegation drop-downs are both visible and are both set to non-default values,
            // then reset the secondary delegation drop-down to its default value.
            alFilter.setDelegatorId(KewApiConstants.DELEGATION_DEFAULT);
        }
        uSession.addObject(KewApiConstants.ACTION_LIST_FILTER_ATTR_NAME, alFilter);
        if (GlobalVariables.getMessageMap().hasNoErrors()) {
            request.getSession().setAttribute(KewApiConstants.REQUERY_ACTION_LIST_KEY, "true");
            ActionForward forward = mapping.findForward("viewActionList");
            // make sure we pass the targetSpecs back to the ActionList
            ActionRedirect redirect = new ActionRedirect(forward);
            redirect.addParameter("documentTargetSpec", filterForm.getDocumentTargetSpec());
            redirect.addParameter("routeLogTargetSpec", filterForm.getRouteLogTargetSpec());
            return redirect;
        }
        return mapping.findForward("viewFilter");
    }

    public ActionForward clear(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        ActionListFilterForm filterForm = (ActionListFilterForm) form;
        filterForm.setFilter(new ActionListFilter());
        filterForm.setCreateDateFrom("");
        filterForm.setCreateDateTo("");
        filterForm.setLastAssignedDateFrom("");
        filterForm.setLastAssignedDateTo("");
        filterForm.setDocTypeFullName("");
        UserSession session = getUserSession();
        session.removeObject(KewApiConstants.ACTION_LIST_FILTER_ATTR_NAME);
        return mapping.findForward("viewFilter");
    }

    public void initForm(HttpServletRequest request, ActionForm form) throws Exception {
        ActionListFilterForm filterForm = (ActionListFilterForm) form;
        filterForm.setUserWorkgroups(getUserWorkgroupsDropDownList(getUserSession().getPrincipalId()));
        PreferencesService prefSrv = KewApiServiceLocator.getPreferencesService();
        Preferences preferences = prefSrv.getPreferences(getUserSession().getPrincipalId());
        request.setAttribute("preferences", preferences);
        ActionListService actionListSrv = KEWServiceLocator.getActionListService();
        request.setAttribute("delegators", ActionListUtil.getWebFriendlyRecipients(actionListSrv.findUserSecondaryDelegators(getUserSession().getPrincipalId())));
        request.setAttribute("primaryDelegates", ActionListUtil.getWebFriendlyRecipients(actionListSrv.findUserPrimaryDelegations(getUserSession().getPrincipalId())));
        if (! filterForm.getMethodToCall().equalsIgnoreCase("clear")) {
            filterForm.validateDates();
        }
        // make sure the back location includes the targetSpec for the Action List
        if (!StringUtils.isBlank(filterForm.getBackLocation())) {
            URIBuilder uri = new URIBuilder(filterForm.getBackLocation());
            if (!StringUtils.isBlank(filterForm.getDocumentTargetSpec())) {
                uri.addParameter("documentTargetSpec", filterForm.getDocumentTargetSpec()).build();
            }
            if (!StringUtils.isBlank(filterForm.getRouteLogTargetSpec())) {
                uri.addParameter("routeLogTargetSpec", filterForm.getRouteLogTargetSpec()).build();
            }
            filterForm.setBackLocation(uri.build().toString());
        }
    }

    private List<? extends KeyValue> getUserWorkgroupsDropDownList(String principalId) {
        List<String> userWorkgroups =
                KimApiServiceLocator.getGroupService().getGroupIdsByPrincipalId(principalId);

        //note that userWorkgroups is unmodifiable so we need to create a new list that we can sort
        List<String> userGroupsToSort = new ArrayList<String>(userWorkgroups);

        List<KeyValue> sortedUserWorkgroups = new ArrayList<KeyValue>();
        KeyValue keyValue = null;
        keyValue = new ConcreteKeyValue(KewApiConstants.NO_FILTERING, KewApiConstants.NO_FILTERING);
        sortedUserWorkgroups.add(keyValue);
        if (userGroupsToSort != null && userGroupsToSort.size() > 0) {
            Collections.sort(userGroupsToSort);

            Group group;
            for (String groupId : userGroupsToSort)
            {
                group = KimApiServiceLocator.getGroupService().getGroup(groupId);
                keyValue = new ConcreteKeyValue(groupId, group.getName());
                sortedUserWorkgroups.add(keyValue);
            }
        }
        return sortedUserWorkgroups;
    }

    private UserSession getUserSession(){
        return GlobalVariables.getUserSession();
    }

}

