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/*
 * Copyright 2008-2009 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 net.hasor.db.dialect.provider;
import net.hasor.db.dialect.BoundSql;
import net.hasor.db.dialect.SqlDialect;
import net.hasor.utils.ExceptionUtils;
import net.hasor.utils.StringUtils;
import net.sf.jsqlparser.JSQLParserException;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.statement.select.OrderByElement;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.select.Select;

import java.sql.JDBCType;
import java.util.*;

/**
 * SqlServer 的 SqlDialect 实现
 * @version : 2020-10-31
 * @author 赵永春 ([email protected])
 */
public class SqlServerDialect implements SqlDialect {
    private static final Map CACHE       = new WeakHashMap<>();
    private static final Object              LOCK_OBJECT = new Object();

    protected static Select parseSelect(String buildSqlString) {
        Select select = CACHE.get(buildSqlString);
        if (select != null) {
            return select;
        }
        synchronized (LOCK_OBJECT) {
            select = CACHE.get(buildSqlString);
            if (select != null) {
                return select;
            }
            try {
                select = (Select) CCJSqlParserUtil.parse(buildSqlString);
                CACHE.put(buildSqlString, select);
                return select;
            } catch (JSQLParserException e) {
                throw ExceptionUtils.toRuntimeException(e);
            }
        }
    }

    @Override
    public String tableName(boolean useQualifier, String category, String tableName) {
        String leftQualifier = useQualifier ? "[" : "";
        String rightQualifier = useQualifier ? "]" : "";
        if (StringUtils.isBlank(category)) {
            return leftQualifier + tableName + rightQualifier;
        } else {
            return leftQualifier + category + rightQualifier + "." + leftQualifier + tableName + rightQualifier;
        }
    }

    @Override
    public String columnName(boolean useQualifier, String category, String tableName, String columnName, JDBCType jdbcType, Class javaType) {
        String leftQualifier = useQualifier ? "[" : "";
        String rightQualifier = useQualifier ? "]" : "";
        return leftQualifier + columnName + rightQualifier;
    }

    @Override
    public BoundSql countSql(BoundSql boundSql) {
        String sqlString = boundSql.getSqlString();
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