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/**
 * All rights reserved.
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 *
 * 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.Clause.CREATE_INDEX;
// ...
// ...
// ...
import static org.jooq.SQLDialect.DERBY;
import static org.jooq.SQLDialect.FIREBIRD;
// ...
// ...
// ...
import static org.jooq.impl.DSL.field;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.table;

import java.util.Collection;

import org.jooq.Clause;
import org.jooq.Condition;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.CreateIndexStep;
import org.jooq.CreateIndexWhereStep;
import org.jooq.Field;
import org.jooq.Name;
import org.jooq.QueryPart;
import org.jooq.SQL;
import org.jooq.SortField;
import org.jooq.Table;

/**
 * @author Lukas Eder
 */
final class CreateIndexImpl extends AbstractQuery implements

    // Cascading interface implementations for CREATE INDEX behaviour
    CreateIndexStep,
    CreateIndexWhereStep {

    /**
     * Generated UID
     */
    private static final long     serialVersionUID = 8904572826501186329L;
    private static final Clause[] CLAUSES          = { CREATE_INDEX };

    private final Name            index;
    private final boolean         unique;
    private final boolean         ifNotExists;
    private Table              table;
    private Field[]            fields;
    private SortField[]        sortFields;
    private Condition             where;

    CreateIndexImpl(Configuration configuration, Name index, boolean unique, boolean ifNotExists) {
        super(configuration);

        this.index = index;
        this.unique = unique;
        this.ifNotExists = ifNotExists;
    }

    // ------------------------------------------------------------------------
    // XXX: DSL API
    // ------------------------------------------------------------------------

    @Override
    public final CreateIndexImpl on(Table t, SortField... f) {
        this.table = t;
        this.sortFields = f;

        return this;
    }

    @Override
    public final CreateIndexImpl on(Table t, Field... f) {
        this.table = t;
        this.fields = f;

        return this;
    }

    @Override
    public final CreateIndexImpl on(String tableName, String... fieldNames) {
        Field[] f = new Field[fieldNames.length];

        for (int i = 0; i < f.length; i++)
            f[i] = field(name(fieldNames[i]));

        return on(table(name(tableName)), f);
    }

    @Override
    public final CreateIndexImpl where(Condition... conditions) {
        where = DSL.and(conditions);
        return this;
    }

    @Override
    public final CreateIndexImpl where(Collection conditions) {
        where = DSL.and(conditions);
        return this;
    }

    @Override
    public final CreateIndexImpl where(Field field) {
        return where(DSL.condition(field));
    }

    @Override
    public final CreateIndexImpl where(SQL sql) {
        return where(DSL.condition(sql));
    }

    @Override
    public final CreateIndexImpl where(String sql) {
        return where(DSL.condition(sql));
    }

    @Override
    public final CreateIndexImpl where(String sql, Object... bindings) {
        return where(DSL.condition(sql, bindings));
    }

    @Override
    public final CreateIndexImpl where(String sql, QueryPart... parts) {
        return where(DSL.condition(sql, parts));
    }

    // ------------------------------------------------------------------------
    // XXX: QueryPart API
    // ------------------------------------------------------------------------

    private final boolean supportsIfNotExists(Context ctx) {
        return !asList(DERBY, FIREBIRD).contains(ctx.family());
    }

    @Override
    public final void accept(Context ctx) {
        if (ifNotExists && !supportsIfNotExists(ctx)) {
            Tools.executeImmediateBegin(ctx, DDLStatementType.CREATE_INDEX);
            accept0(ctx);
            Tools.executeImmediateEnd(ctx, DDLStatementType.CREATE_INDEX);
        }
        else {
            accept0(ctx);
        }
    }

    private final void accept0(Context ctx) {
        ctx.keyword("create");

        if (unique)
            ctx.sql(' ')
               .keyword("unique");

        ctx.sql(' ')
           .keyword("index")
           .sql(' ');

        if (ifNotExists && supportsIfNotExists(ctx))
            ctx.keyword("if not exists")
               .sql(' ');

        ctx.visit(index)
           .sql(' ')
           .keyword("on")
           .sql(' ')
           .visit(table)
           .sql('(')
           .qualify(false)
           .visit(fields != null ? new QueryPartList(fields) : new QueryPartList(sortFields))
           .qualify(true)
           .sql(')');

        if (where != null)
            ctx.sql(' ')
               .keyword("where")
               .sql(' ')
               .qualify(false)
               .visit(where)
               .qualify(true);
    }

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