/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *     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.
 */
package org.apache.cassandra.auth;

import java.util.concurrent.TimeUnit;

import org.apache.cassandra.cql3.statements.schema.CreateTableStatement;
import org.apache.cassandra.schema.TableId;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.schema.SchemaConstants;
import org.apache.cassandra.schema.KeyspaceMetadata;
import org.apache.cassandra.schema.KeyspaceParams;
import org.apache.cassandra.schema.Tables;

import static java.lang.String.format;

public final class AuthKeyspace
{
    private AuthKeyspace()
    {
    }

    /**
     * Generation is used as a timestamp for automatic table creation on startup.
     * If you make any changes to the tables below, make sure to increment the
     * generation and document your change here.
     *
     * gen 0: original definition in 3.0
     * gen 1: compression chunk length reduced to 16KiB, memtable_flush_period_in_ms now unset on all tables in 4.0
     */
    public static final long GENERATION = 1;

    public static final String ROLES = "roles";
    public static final String ROLE_MEMBERS = "role_members";
    public static final String ROLE_PERMISSIONS = "role_permissions";
    public static final String RESOURCE_ROLE_INDEX = "resource_role_permissons_index";
    public static final String NETWORK_PERMISSIONS = "network_permissions";

    public static final long SUPERUSER_SETUP_DELAY = Long.getLong("cassandra.superuser_setup_delay_ms", 10000);

    private static final TableMetadata Roles =
        parse(ROLES,
              "role definitions",
              "CREATE TABLE %s ("
              + "role text,"
              + "is_superuser boolean,"
              + "can_login boolean,"
              + "salted_hash text,"
              + "member_of set<text>,"
              + "PRIMARY KEY(role))");

    private static final TableMetadata RoleMembers =
        parse(ROLE_MEMBERS,
              "role memberships lookup table",
              "CREATE TABLE %s ("
              + "role text,"
              + "member text,"
              + "PRIMARY KEY(role, member))");

    private static final TableMetadata RolePermissions =
        parse(ROLE_PERMISSIONS,
              "permissions granted to db roles",
              "CREATE TABLE %s ("
              + "role text,"
              + "resource text,"
              + "permissions set<text>,"
              + "PRIMARY KEY(role, resource))");

    private static final TableMetadata ResourceRoleIndex =
        parse(RESOURCE_ROLE_INDEX,
              "index of db roles with permissions granted on a resource",
              "CREATE TABLE %s ("
              + "resource text,"
              + "role text,"
              + "PRIMARY KEY(resource, role))");

    private static final TableMetadata NetworkPermissions =
        parse(NETWORK_PERMISSIONS,
              "user network permissions",
              "CREATE TABLE %s ("
              + "role text, "
              + "dcs frozen<set<text>>, "
              + "PRIMARY KEY(role))");

    private static TableMetadata parse(String name, String description, String cql)
    {
        return CreateTableStatement.parse(format(cql, name), SchemaConstants.AUTH_KEYSPACE_NAME)
                                   .id(TableId.forSystemTable(SchemaConstants.AUTH_KEYSPACE_NAME, name))
                                   .comment(description)
                                   .gcGraceSeconds((int) TimeUnit.DAYS.toSeconds(90))
                                   .build();
    }

    public static KeyspaceMetadata metadata()
    {
        return KeyspaceMetadata.create(SchemaConstants.AUTH_KEYSPACE_NAME,
                                       KeyspaceParams.simple(1),
                                       Tables.of(Roles, RoleMembers, RolePermissions, ResourceRoleIndex, NetworkPermissions));
    }
}
