/*
 * (C) Copyright 2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 *
 * Contributors:
 *     Thomas Roger
 */
package org.nuxeo.ecm.webapp.security;

import static org.nuxeo.ecm.platform.ui.web.api.WebActions.SUBTAB_CATEGORY_SUFFIX;

import java.util.ArrayList;
import java.util.List;

import org.jboss.seam.annotations.In;
import org.jboss.seam.faces.FacesMessages;
import org.nuxeo.ecm.core.api.NuxeoPrincipal;
import org.nuxeo.ecm.platform.contentview.seam.ContentViewActions;
import org.nuxeo.ecm.platform.ui.web.api.NavigationContext;
import org.nuxeo.ecm.platform.ui.web.api.WebActions;
import org.nuxeo.ecm.platform.usermanager.UserManager;
import org.nuxeo.ecm.webapp.helpers.ResourcesAccessor;

/**
 * Common properties and methods for Users and Groups management.
 *
 * @author <a href="mailto:[email protected]">Thomas Roger</a>
 * @since 5.4.2
 */
public abstract class AbstractUserGroupManagement {

    public static final String VIEW_HOME = "view_home";

    public static final String MAIN_TABS_CATEGORY = "MAIN_TABS";

    public static final String MAIN_TAB_HOME = MAIN_TABS_CATEGORY + ":home";

    public static final String NUXEO_ADMIN_CATEGORY = "NUXEO_ADMIN";

    public static final String USER_CENTER_CATEGORY = "USER_CENTER";

    public static final String USERS_GROUPS_MANAGER = "UsersGroupsManager";

    public static final String USERS_GROUPS_MANAGER_SUB_TAB = USERS_GROUPS_MANAGER + SUBTAB_CATEGORY_SUFFIX;

    public static final String USERS_GROUPS_HOME = "UsersGroupsHome";

    public static final String USERS_GROUPS_HOME_SUB_TAB = USERS_GROUPS_HOME + SUBTAB_CATEGORY_SUFFIX;

    public static final String VALID_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-0123456789.@";

    public static final String DEFAULT_LISTING_MODE = "search_only";

    public static final String DETAILS_VIEW_MODE = "view";

    public static final String USERS_GROUPS_MANAGEMENT_ACCESS_FILTER = "usersGroupsManagementAccess";

    @In(create = true)
    protected NuxeoPrincipal currentUser;

    @In(create = true)
    protected transient UserManager userManager;

    @In(create = true)
    protected ContentViewActions contentViewActions;

    @In(create = true)
    protected WebActions webActions;

    @In(create = true)
    protected transient NavigationContext navigationContext;

    @In(create = true, required = false)
    protected FacesMessages facesMessages;

    @In(create = true)
    protected ResourcesAccessor resourcesAccessor;

    protected String searchString = "";

    protected String listingMode;

    protected String detailsMode;

    protected boolean showCreateForm;

    protected boolean showUserOrGroup;

    protected boolean shouldResetStateOnTabChange = true;

    public String getSearchString() {
        return searchString;
    }

    public void setSearchString(String searchString) {
        this.searchString = searchString;
    }

    public String getListingMode() {
        if (listingMode == null) {
            listingMode = computeListingMode();
            if (listingMode == null || listingMode.trim().isEmpty()) {
                listingMode = DEFAULT_LISTING_MODE;
            }
        }
        return listingMode;
    }

    protected abstract String computeListingMode();

    public void setListingMode(String listingMode) {
        this.listingMode = listingMode;
    }

    public String getDetailsMode() {
        if (detailsMode == null) {
            detailsMode = DETAILS_VIEW_MODE;
        }
        return detailsMode;
    }

    public void setDetailsMode(String mode) {
        detailsMode = mode;
    }

    public boolean isShowCreateForm() {
        return showCreateForm;
    }

    public void toggleShowCreateForm() {
        showCreateForm = !showCreateForm;
        detailsMode = null;
    }

    public boolean isShowUserOrGroup() {
        return showUserOrGroup;
    }

    public void toggleShowUserOrGroup() {
        showUserOrGroup = !showUserOrGroup;
        detailsMode = null;
    }

    /**
     * Retrieve recursively the list of all groups that are admins.
     *
     * @return
     * @since 5.9.3
     */
    protected List<String> getAllAdminGroups() {
        List<String> adminGroups = new ArrayList<>();
        for (String adminGroup : userManager.getAdministratorsGroups()) {
            adminGroups.add(adminGroup);
            adminGroups.addAll(getAllSubGroups(adminGroup));
        }
        return adminGroups;
    }

    /**
     * Recursively lookup all the sub groups of a given group.
     *
     * @param groupName
     * @return
     * @since 5.9.3
     */
    private List<String> getAllSubGroups(String groupName) {
        return getAllSubGroups(groupName, new ArrayList<String>());
    }

    /**
     * Recursively accumulate all the sub groups a a given group.
     *
     * @param groupName
     * @param accumulator
     * @return
     * @since 5.9.3
     */
    private List<String> getAllSubGroups(String groupName, List<String> accumulator) {
        List<String> subGroups = userManager.getGroupsInGroup(groupName);
        if (!subGroups.isEmpty()) {
            accumulator.addAll(subGroups);
            for (String name : subGroups) {
                getAllSubGroups(name, accumulator);
            }
        }
        return accumulator;
    }

}