/*
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
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 *
 */
package org.jooq.impl;

import static org.jooq.Clause.FIELD_ROW;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

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

/**
 * @author Lukas Eder
 */
final class FieldMapForInsert extends AbstractQueryPartMap<Field<?>, Field<?>> {

    /**
     * Generated UID
     */
    private static final long     serialVersionUID = -2192833491610583485L;
    private static final Clause[] CLAUSES          = { FIELD_ROW };

    FieldMapForInsert() {
    }

    @Override
    public final void accept(Context<?> ctx) {
        boolean indent = (size() > 1);

        ctx.sql('(');

        if (indent)
            ctx.formatIndentStart();

        String separator = "";
        for (Field<?> field : values()) {
            ctx.sql(separator);

            if (indent)
                ctx.formatNewLine();

            ctx.visit(field);
            separator = ", ";
        }

        if (indent)
            ctx.formatIndentEnd()
               .formatNewLine();

        ctx.sql(')');
    }

    final void toSQLReferenceKeys(Context<?> ctx) {

        // [#2995] Do not generate empty column lists.
        if (size() == 0)
            return;

        boolean indent = (size() > 1);

        ctx.sql(" (");

        if (indent)
            ctx.formatIndentStart();

        // [#989] Avoid qualifying fields in INSERT field declaration
        boolean qualify = ctx.qualify();
        ctx.qualify(false);

        String separator = "";
        for (Field<?> field : keySet()) {
            ctx.sql(separator);

            if (indent)
                ctx.formatNewLine();

            ctx.visit(field);
            separator = ", ";
        }

        ctx.qualify(qualify);

        if (indent)
            ctx.formatIndentEnd()
               .formatNewLine();

        ctx.sql(')');
    }

    @Override
    public final Clause[] clauses(Context<?> ctx) {
        return CLAUSES;
    }

    final void putFields(Collection<? extends Field<?>> fields) {
        for (Field<?> field : fields)
            put(field, null);
    }

    final void putValues(Collection<? extends Field<?>> values) {
        if (values.size() != size())
            throw new IllegalArgumentException("The number of values must match the number of fields: " + this);

        Iterator<? extends Field<?>> it = values.iterator();
        for (Entry<Field<?>, Field<?>> entry : entrySet())
            entry.setValue(it.next());
    }

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

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