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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.sql.teradata;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

import com.querydsl.sql.Configuration;
import com.querydsl.sql.SQLBindings;
import com.querydsl.sql.SQLTemplates;
import com.querydsl.sql.dml.AbstractSQLClause;

/**
 * {@code SetQueryBandClause} provides support for Teradata specific set query_band executions.
 *
 * @author tiwe
 *
 */
public class SetQueryBandClause extends AbstractSQLClause {

    private boolean forSession = true;

    private final Map values = new LinkedHashMap<>();

    private transient String queryString;

    private transient String parameter;

    public SetQueryBandClause(Connection connection, SQLTemplates templates) {
        this(connection, new Configuration(templates));
    }

    public SetQueryBandClause(Connection connection, Configuration configuration) {
        super(configuration, connection);
    }

    public SetQueryBandClause(Supplier connection, Configuration configuration) {
        super(configuration, connection);
    }

    public SetQueryBandClause forSession() {
        queryString = null;
        forSession = true;
        return this;
    }

    public SetQueryBandClause forTransaction() {
        queryString = null;
        forSession = false;
        return this;
    }

    public SetQueryBandClause set(String key, String value) {
        queryString = null;
        values.put(key, value);
        return this;
    }

    public SetQueryBandClause set(Map values) {
        queryString = null;
        this.values.putAll(values);
        return this;
    }

    @Override
    public void clear() {
        values.clear();
    }

    @Override
    public long execute() {
        PreparedStatement stmt = null;
        try {
            stmt = connection().prepareStatement(toString());
            if (parameter != null) {
                stmt.setString(1, parameter);
            }
            return 1;
        } catch (SQLException e) {
            List