/*-
 * ============LICENSE_START=======================================================
 * ONAP Policy Engine
 * ================================================================================
 * Copyright (C) 2018-2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.onap.policy.model.Roles;

public final class UserUtils {

    private UserUtils() {
        // Empty Constructor
    }

    public static class Pair<T, U> {
        public final T t;
        public final U u;

        public Pair(T t, U u) {
            this.t = t;
            this.u = u;
        }
    }

    /**
     * Check Role and its Scopes.
     * 
     * @param userRoles list of UserRoles.
     * @return return role and scope from UserRole Object.
     */
    public static Pair<Set<String>, List<String>> checkRoleAndScope(List<Object> userRoles) {
        Set<String> scopes;
        List<String> roles;
        // Check if the Role and Scope Size are Null get the values from db.
        roles = new ArrayList<>();
        scopes = new HashSet<>();
        for (Object role : userRoles) {
            Roles userRole = (Roles) role;
            roles.add(userRole.getRole());
            if (userRole.getScope() != null) {
                if (userRole.getScope().contains(",")) {
                    String[] multipleScopes = userRole.getScope().split(",");
                    for (int i = 0; i < multipleScopes.length; i++) {
                        scopes.add(trimScope(multipleScopes[i]));
                    }
                } else {
                    scopes.add(trimScope(userRole.getScope()));
                }
            }
        }
        return new Pair<>(scopes, roles);
    }

    /**
     * Get Role by Scope based on UserRole Object.
     * 
     * @param userRoles list of UserRoles.
     * @return return the map<scope, role>.
     */
    public static Map<String, String> getRoleByScope(List<Object> userRoles) {
        Map<String, String> rolesList = new HashMap<>();
        for (Object role : userRoles) {
            Roles userRole = (Roles) role;
            if (!userRole.getRole().startsWith("super-")) {
                rolesList = addNonSuperUserScopes(userRole, rolesList);
            } else {
                rolesList.put("@All@", userRole.getRole());
            }
        }
        return rolesList;
    }

    /**
     * Read non super role scopes and add to map.
     * 
     * @param userRole Role Object.
     * @param rolesList roleList Object.
     * @return return the map<scope, role>.
     */
    private static Map<String, String> addNonSuperUserScopes(Roles userRole, Map<String, String> rolesList) {
        if (userRole.getScope() != null && !(userRole.getScope().trim().isEmpty())) {
            if (userRole.getScope().contains(",")) {
                String[] multipleScopes = userRole.getScope().split(",");
                for (int i = 0; i < multipleScopes.length; i++) {
                    rolesList.put(trimScope(multipleScopes[i]), userRole.getRole());
                }
            } else {
                rolesList.put(trimScope(userRole.getScope()), userRole.getRole());
            }
        }
        return rolesList;
    }

    /**
     * Trim Scope Value.
     * 
     * @param scope string scope name.
     * @return trim scope.
     */
    private static String trimScope(String scope) {
        return scope.replace("[", "").replace("]", "").replace("\"", "").trim();
    }

}