/*
 * The Kuali Financial System, a comprehensive financial management system for higher education.
 *
 * Copyright 2005-2016 The Kuali Foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kuali.kfs.krad.kim;

import org.apache.commons.lang.StringUtils;
import org.kuali.kfs.kns.kim.permission.PermissionTypeServiceBase;
import org.kuali.rice.kim.api.KimConstants;
import org.kuali.rice.kim.api.permission.Permission;
import org.kuali.rice.kim.impl.permission.PermissionBo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * Type service for the 'View Line Action' KIM type which matches on the id for a UIF view, group id or collection
 * property name, field id or action event
 */
public class ViewLineActionPermissionTypeServiceImpl extends PermissionTypeServiceBase {

    @Override
    protected List<String> getRequiredAttributes() {
        List<String> attributes = new ArrayList<String>(super.getRequiredAttributes());
        attributes.add(KimConstants.AttributeConstants.VIEW_ID);

        return Collections.unmodifiableList(attributes);
    }

    /**
     * Filters the given permission list to return those that match on group id or collection property name, field
     * id or action event, then calls super to filter based on view id
     *
     * @param requestedDetails - map of details requested with permission (used for matching)
     * @param permissionsList  - list of permissions to process for matches
     * @return List<Permission> list of permissions that match the requested details
     */
    @Override
    protected List<Permission> performPermissionMatches(Map<String, String> requestedDetails,
                                                        List<Permission> permissionsList) {

        String requestedGroupId = null;
        if (requestedDetails.containsKey(KimConstants.AttributeConstants.GROUP_ID)) {
            requestedGroupId = requestedDetails.get(KimConstants.AttributeConstants.GROUP_ID);
        }

        String requestedCollectionPropertyName = null;
        if (requestedDetails.containsKey(KimConstants.AttributeConstants.COLLECTION_PROPERTY_NAME)) {
            requestedCollectionPropertyName = requestedDetails.get(
                KimConstants.AttributeConstants.COLLECTION_PROPERTY_NAME);
        }

        String requestedFieldId = null;
        if (requestedDetails.containsKey(KimConstants.AttributeConstants.FIELD_ID)) {
            requestedFieldId = requestedDetails.get(KimConstants.AttributeConstants.FIELD_ID);
        }

        String requestedActionEvent = null;
        if (requestedDetails.containsKey(KimConstants.AttributeConstants.ACTION_EVENT)) {
            requestedActionEvent = requestedDetails.get(KimConstants.AttributeConstants.ACTION_EVENT);
        }

        List<Permission> matchingPermissions = new ArrayList<Permission>();
        for (Permission permission : permissionsList) {
            PermissionBo bo = PermissionBo.from(permission);

            String permissionGroupId = null;
            if (bo.getDetails().containsKey(KimConstants.AttributeConstants.GROUP_ID)) {
                permissionGroupId = bo.getDetails().get(KimConstants.AttributeConstants.GROUP_ID);
            }

            String permissionCollectionPropertyName = null;
            if (bo.getDetails().containsKey(KimConstants.AttributeConstants.COLLECTION_PROPERTY_NAME)) {
                permissionCollectionPropertyName = bo.getDetails().get(
                    KimConstants.AttributeConstants.COLLECTION_PROPERTY_NAME);
            }

            String permissionFieldId = null;
            if (bo.getDetails().containsKey(KimConstants.AttributeConstants.FIELD_ID)) {
                permissionFieldId = bo.getDetails().get(KimConstants.AttributeConstants.FIELD_ID);
            }

            String permissionActionEvent = null;
            if (bo.getDetails().containsKey(KimConstants.AttributeConstants.ACTION_EVENT)) {
                permissionActionEvent = bo.getDetails().get(KimConstants.AttributeConstants.ACTION_EVENT);
            }

            boolean groupMatch = false;
            if ((requestedGroupId != null) && (permissionGroupId != null) && StringUtils.equals(requestedGroupId,
                permissionGroupId)) {
                groupMatch = true;
            } else if ((requestedCollectionPropertyName != null)
                && (permissionCollectionPropertyName != null)
                && StringUtils.equals(requestedCollectionPropertyName, permissionCollectionPropertyName)) {
                groupMatch = true;
            }

            if (groupMatch) {
                if ((requestedFieldId != null) && (permissionFieldId != null) && StringUtils.equals(requestedFieldId,
                    permissionFieldId)) {
                    matchingPermissions.add(permission);
                } else if ((requestedActionEvent != null) && (permissionActionEvent != null) && StringUtils.equals(
                    requestedActionEvent, permissionActionEvent)) {
                    matchingPermissions.add(permission);
                }
            }
        }

        return super.performPermissionMatches(requestedDetails, matchingPermissions);
    }

}
