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/*
 * Copyright 2016-2018 shardingsphere.io.
 * 
 * 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 io.shardingsphere.core.util;

import com.google.common.base.CharMatcher;
import io.shardingsphere.core.constant.DatabaseType;
import io.shardingsphere.core.parsing.lexer.dialect.mysql.MySQLKeyword;
import io.shardingsphere.core.parsing.lexer.token.DefaultKeyword;
import lombok.AccessLevel;
import lombok.AllArgsConstructor;

/**
 * SQL utility class.
 * 
 * @author gaohongtao
 */
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class SQLUtil {
    
    /**
     * Get exactly value for SQL expression.
     * 
     * remove special char for SQL expression
     * 
     * @param value SQL expression
     * @return exactly SQL expression
     */
    public static String getExactlyValue(final String value) {
        return null == value ? null : CharMatcher.anyOf("[]`'\"").removeFrom(value);
    }
    
    /**
     * Get original value for SQL expression.
     * 
     * @param value SQL expression
     * @param databaseType database type
     * @return original SQL expression
     */
    public static String getOriginalValue(final String value, final DatabaseType databaseType) {
        if (DatabaseType.MySQL != databaseType) {
            return value;
        }
        try {
            DefaultKeyword.valueOf(value.toUpperCase());
            return String.format("`%s`", value);
        } catch (final IllegalArgumentException ex) {
            return getOriginalValueForMySQLKeyword(value);
        }
    }
    
    private static String getOriginalValueForMySQLKeyword(final String value) {
        try {
            MySQLKeyword.valueOf(value.toUpperCase());
            return String.format("`%s`", value);
        } catch (final IllegalArgumentException ex) {
            return value;
        }
    }
}