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/*
 * Copyright 2018-2020 the original author or authors.
 *
 * 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.
 */

package dev.miku.r2dbc.mysql.constant;

/**
 * Values for the capabilities flag bitmask used by the MySQL Client/Server Protocol.
 */
public final class Capabilities {

    /**
     * Can use long password.
     */
    private static final int LONG_PASSWORD = 1;

    /**
     * Use found/touched rows instead of changed rows for affected rows, should enable this.
     */
    private static final int FOUND_ROWS = 2;

    /**
     * Get all column.
     */
    private static final int LONG_FLAG = 4;

    public static final int CONNECT_WITH_DB = 8;

//    public static final int NO_SCHEMA = 16; // Don't allows statement like {@code database.table.column}.
//    public static final int COMPRESS = 32; // The deflate compression, old compression flag.
//    public static final int ODBC = 64; // Is this client ODBC?
//    public static final int LOCAL_FILES = 128; // Can use local data
//    public static final int IGNORE_SPACE = 256; // Ignore spaces before '('.

    public static final int PROTOCOL_41 = 512;

//    public static final int INTERACTIVE_CLIENT = 1024; // Does this client is interactive? (answer is no)

    public static final int SSL = 2048;

    private static final int IGNORE_SIGPIPE = 4096;

    public static final int TRANSACTIONS = 8192;

    /**
     * Old flag for PROTOCOL_41.
     */
    private static final int RESERVED = 16384;

    /**
     * Can do 4.1 authentication, is also RESERVED2, allowing second part of authentication hashing salt.
     */
    public static final int SECURE_CONNECTION = 32768;

    public static final int MULTI_STATEMENTS = 65536;

    private static final int MULTI_RESULTS = 1 << 17;

    private static final int PREPARED_MULTI_RESULTS = 1 << 18;

    public static final int PLUGIN_AUTH = 1 << 19;

    public static final int CONNECT_ATTRS = 1 << 20;

    /**
     * Can use var int sized bytes to encode client data.
     */
    public static final int PLUGIN_AUTH_VAR_INT_SIZED_DATA = 1 << 21;

//    public static final int HANDLE_EXPIRED_PASSWORD = 1 << 22; // Client can handle expired passwords.
//    public static final int SESSION_TRACK = 1 << 23;

    /**
     * WARNING: should ALWAYS enable this option. MySQL recommends deprecating EOF messages.
     */
    public static final int DEPRECATE_EOF = 1 << 24;

//    public static final int OPTIONAL_RESULT_SET_METADATA = 1 << 25; // means server MAYBE have NOT metadata in response, should NEVER enable this option.
//    public static final int Z_STD_COMPRESSION = 1 << 26;
//    public static final int CAPABILITY_EXTENSION = 1 << 29;

    public static final int SSL_VERIFY_SERVER_CERT = 1 << 30;

//    public static final int REMEMBER_OPTIONS = 1 << 31;

    public static final int ALL_SUPPORTED = LONG_PASSWORD | FOUND_ROWS | LONG_FLAG | CONNECT_WITH_DB |
        PROTOCOL_41 | SSL | IGNORE_SIGPIPE | TRANSACTIONS | RESERVED | SECURE_CONNECTION |
        MULTI_STATEMENTS | MULTI_RESULTS | PREPARED_MULTI_RESULTS | PLUGIN_AUTH | CONNECT_ATTRS |
        PLUGIN_AUTH_VAR_INT_SIZED_DATA | DEPRECATE_EOF | SSL_VERIFY_SERVER_CERT;

    private Capabilities() {
    }
}