/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.
 */
package com.querydsl.sql;

import static com.querydsl.sql.SQLExpressions.select;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

import com.querydsl.core.types.Ops;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.core.types.dsl.NumberExpression;


public class PostgreSQLTemplatesTest extends AbstractSQLTemplatesTest {

    @Override
    protected SQLTemplates createTemplates() {
        return new PostgreSQLTemplates();
    }

    @Test
    public void noFrom() {
        query.getMetadata().setProjection(Expressions.ONE);
        assertEquals("select 1", query.toString());
    }

    @SuppressWarnings("unchecked")
    @Test
    public void union() {
        NumberExpression<Integer> one = Expressions.ONE;
        NumberExpression<Integer> two = Expressions.TWO;
        NumberExpression<Integer> three = Expressions.THREE;
        Path<Integer> col1 = Expressions.path(Integer.class,"col1");
        Union union = query.union(
                select(one.as(col1)),
                select(two),
                select(three));
        assertEquals(
                "(select 1 as col1)\n" +
                "union\n" +
                "(select 2)\n" +
                "union\n" +
                "(select 3)", union.toString());
    }

    @Test
    public void precedence() {
        //.    left    table/column name separator
        //        ::    left    PostgreSQL-style typecast
        //[ ]    left    array element selection
        //+ -    right    unary plus, unary minus
        int p0 = getPrecedence(Ops.NEGATE);
        //        ^    left    exponentiation
        //        * / %    left    multiplication, division, modulo
        int p1 = getPrecedence(Ops.MULT, Ops.DIV, Ops.MOD);
        //+ -    left    addition, subtraction
        int p2 = getPrecedence(Ops.ADD, Ops.SUB);
        //IS         IS TRUE, IS FALSE, IS NULL, etc
        int p3 = getPrecedence(Ops.IS_NULL, Ops.IS_NOT_NULL);
        //ISNULL         test for null
        //NOTNULL         test for not null
        //(any other)    left    all other native and user-defined operators
        //IN         set membership
        int p4 = getPrecedence(Ops.IN);
        //BETWEEN         range containment
        int p5 = getPrecedence(Ops.BETWEEN);
        //OVERLAPS         time interval overlap
        //LIKE ILIKE SIMILAR         string pattern matching
        int p6 = getPrecedence(Ops.LIKE, Ops.LIKE_ESCAPE);
        //< >         less than, greater than
        int p7 = getPrecedence(Ops.LT, Ops.GT);
        //        =    right    equality, assignment
        int p8 = getPrecedence(Ops.EQ);
        //NOT    right    logical negation
        int p9 = getPrecedence(Ops.NOT);
        //AND    left    logical conjunction
        int p10 = getPrecedence(Ops.AND);
        //OR    left    logical disjunction
        int p11 = getPrecedence(Ops.OR);

        assertTrue(p0 < p1);
        assertTrue(p1 < p2);
        assertTrue(p2 < p3);
        assertTrue(p3 < p4);
        assertTrue(p4 < p5);
        assertTrue(p5 < p6);
        assertTrue(p6 < p7);
        assertTrue(p7 < p8);
        assertTrue(p8 < p9);
        assertTrue(p9 < p10);
        assertTrue(p10 < p11);
    }

    @Test
    @Override
    public void booleanTemplate() {
        assertSerialized(Expressions.booleanPath("b").eq(Expressions.TRUE), "b = true");
        assertSerialized(Expressions.booleanPath("b").eq(Expressions.FALSE), "b = false");
        query.setUseLiterals(true);
        query.where(Expressions.booleanPath("b").eq(true));
        assertTrue(query.toString(), query.toString().endsWith("where b = true"));
    }

}