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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * 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 java.util.Arrays.asList;
import static org.jooq.Clause.CONDITION;
import static org.jooq.Clause.CONDITION_COMPARISON;
import static org.jooq.Comparator.LIKE;
import static org.jooq.Comparator.LIKE_IGNORE_CASE;
import static org.jooq.Comparator.NOT_LIKE;
import static org.jooq.Comparator.NOT_LIKE_IGNORE_CASE;
// ...
// ...
import static org.jooq.SQLDialect.DERBY;
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
import static org.jooq.conf.ParamType.INLINED;
import static org.jooq.impl.DSL.inline;

import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Condition;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.LikeEscapeStep;
import org.jooq.SQLDialect;
import org.jooq.conf.ParamType;

/**
 * @author Lukas Eder
 */
final class CompareCondition extends AbstractCondition implements LikeEscapeStep {

    private static final long     serialVersionUID = -747240442279619486L;
    private static final Clause[] CLAUSES          = { CONDITION, CONDITION_COMPARISON };

    private final Field        field1;
    private final Field        field2;
    private final Comparator      comparator;
    private Character             escape;

    CompareCondition(Field field1, Field field2, Comparator comparator) {
        this.field1 = field1;
        this.field2 = field2;
        this.comparator = comparator;
    }

    @Override
    public final Condition escape(char c) {
        this.escape = c;
        return this;
    }

    @Override
    public final void accept(Context ctx) {
        SQLDialect family = ctx.family();
        Field lhs = field1;
        Field rhs = field2;
        Comparator op = comparator;

        // [#1159] Some dialects cannot auto-convert the LHS operand to a
        // VARCHAR when applying a LIKE predicate
        // [#293] TODO: This could apply to other operators, too
        if ((op == LIKE || op == NOT_LIKE)
                && field1.getType() != String.class
                && asList(DERBY, POSTGRES).contains(family)) {

            lhs = lhs.cast(String.class);
        }

        // [#1423] Only Postgres knows a true ILIKE operator. Other dialects
        // need to emulate this as LOWER(lhs) LIKE LOWER(rhs)
        else if ((op == LIKE_IGNORE_CASE || op == NOT_LIKE_IGNORE_CASE)
                && POSTGRES != family) {

            lhs = lhs.lower();
            rhs = rhs.lower();
            op = (op == LIKE_IGNORE_CASE ? LIKE : NOT_LIKE);
        }

        ctx.visit(lhs)
           .sql(' ');

        boolean castRhs = false;
        ParamType previousParamType = ctx.paramType();
        ParamType forcedParamType = previousParamType;














                     ctx.keyword(op.toSQL()).sql(' ');
        if (castRhs) ctx.keyword("cast").sql('(');
                     ctx.paramType(forcedParamType)
                        .visit(rhs)
                        .paramType(previousParamType);
        if (castRhs) ctx.sql(' ').keyword("as").sql(' ').keyword("varchar").sql("(4000))");

        if (escape != null) {
            ctx.sql(' ').keyword("escape").sql(' ')
               .visit(inline(escape));
        }
    }

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