/*
 * 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.SQLDialect.MARIADB;
// ...
import static org.jooq.SQLDialect.MYSQL;
import static org.jooq.SQLDialect.POSTGRES;
// ...
// ...
// ...
// ...
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.Tools.EMPTY_SORTFIELD;

import java.util.Arrays;
import java.util.EnumSet;
import java.util.List;

import org.jooq.Condition;
import org.jooq.Context;
import org.jooq.Index;
import org.jooq.Name;
import org.jooq.OrderField;
import org.jooq.SQLDialect;
import org.jooq.SortField;
import org.jooq.Table;

/**
 * @author Lukas Eder
 */
class IndexImpl extends AbstractNamed implements Index {

    /**
     * Generated UID
     */
    private static final long                serialVersionUID               = -5253463940194393996L;

    // [#8723] TODO: Specify the dialects that require table qualification once they're known.
    private static final EnumSet<SQLDialect> REQUIRE_TABLE_QUALIFICATION    = EnumSet.noneOf(SQLDialect.class);
    private static final EnumSet<SQLDialect> NO_SUPPORT_INDEX_QUALIFICATION = EnumSet.of(MARIADB, MYSQL, POSTGRES);

    private final Table<?>                   table;
    private final SortField<?>[]             fields;
    private final Condition                  where;
    private final boolean                    unique;

    IndexImpl(Name name) {
        this(name, null, EMPTY_SORTFIELD, null, false);
    }

    IndexImpl(Name name, Table<?> table, OrderField<?>[] fields, Condition where, boolean unique) {
        super(qualify(table, name), CommentImpl.NO_COMMENT);

        this.table = table;
        this.fields = Tools.sortFields(fields);
        this.where = where;
        this.unique = unique;
    }

    final SortField<?>[]    $fields()      { return fields; }
    final boolean           $unique()      { return unique; }

    @Override
    public final void accept(Context<?> ctx) {
        if (NO_SUPPORT_INDEX_QUALIFICATION.contains(ctx.family()))
            ctx.visit(getUnqualifiedName());
        else if (REQUIRE_TABLE_QUALIFICATION.contains(ctx.family()))
            ctx.visit(getQualifiedName());
        else if (getTable() == null)
            ctx.visit(getUnqualifiedName());
        else
            ctx.visit(name(getTable().getQualifiedName().qualifier(), getUnqualifiedName()));
    }

    @Override
    public final Table<?> getTable() {
        return table;
    }

    @Override
    public final List<SortField<?>> getFields() {
        return Arrays.asList(fields);
    }

    @Override
    public final Condition getWhere() {
        return where;
    }

    @Override
    public boolean getUnique() {
        return unique;
    }
}