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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */
package org.jooq.impl;

import static java.util.Arrays.asList;
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.SQLITE;

import java.util.Map;

import org.jooq.Clause;
import org.jooq.Context;
import org.jooq.Field;

/**
 * @author Lukas Eder
 */
class FieldMapForUpdate extends AbstractQueryPartMap, Field> {

    /**
     * Generated UID
     */
    private static final long serialVersionUID = -6139709404698673799L;

    private final Clause      assignmentClause;

    FieldMapForUpdate(Clause assignmentClause) {
        this.assignmentClause = assignmentClause;
    }

    @Override
    public final void accept(Context ctx) {
        if (size() > 0) {
            String separator = "";

            // [#989] Some dialects do not support qualified column references
            // in the UPDATE statement's SET clause

            // [#2055] Other dialects require qualified column references to
            // disambiguated columns in queries like
            // UPDATE t1 JOIN t2 .. SET t1.val = ..., t2.val = ...
            boolean restoreQualify = ctx.qualify();
            boolean supportsQualify = asList(POSTGRES, SQLITE).contains(ctx.configuration().dialect()) ? false : restoreQualify;

            for (Entry, Field> entry : entrySet()) {
                ctx.sql(separator);

                if (!"".equals(separator)) {
                    ctx.formatNewLine();
                }

                ctx.start(assignmentClause)
                   .qualify(supportsQualify)
                   .visit(entry.getKey())
                   .qualify(restoreQualify)
                   .sql(" = ")
                   .visit(entry.getValue())
                   .end(assignmentClause);

                separator = ", ";
            }
        }
        else {
            ctx.sql("[ no fields are updated ]");
        }
    }

    @Override
    public final Clause[] clauses(Context ctx) {
        return null;
    }

    final void set(Map, ?> map) {
        for (Entry, ?> entry : map.entrySet()) {
            Field field = entry.getKey();
            Object value = entry.getValue();

            put(entry.getKey(), Utils.field(value, field));
        }
    }
}