/*
 * 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.facebook.presto.sql.planner;

import com.facebook.presto.spi.block.SortOrder;
import com.facebook.presto.sql.planner.assertions.BasePlanTest;
import com.facebook.presto.sql.planner.assertions.ExpectedValueProvider;
import com.facebook.presto.sql.planner.assertions.PlanAssert;
import com.facebook.presto.sql.planner.assertions.PlanMatchPattern;
import com.facebook.presto.sql.planner.iterative.IterativeOptimizer;
import com.facebook.presto.sql.planner.iterative.rule.RemoveRedundantIdentityProjections;
import com.facebook.presto.sql.planner.optimizations.PlanOptimizer;
import com.facebook.presto.sql.planner.optimizations.UnaliasSymbolReferences;
import com.facebook.presto.sql.planner.plan.WindowNode;
import com.facebook.presto.testing.LocalQueryRunner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import org.intellij.lang.annotations.Language;
import org.testng.annotations.Test;

import java.util.List;
import java.util.Optional;

import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.anyTree;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.expression;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.functionCall;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.join;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.project;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.specification;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.values;
import static com.facebook.presto.sql.planner.assertions.PlanMatchPattern.window;
import static com.facebook.presto.sql.planner.plan.JoinNode.Type.INNER;

public class TestCanonicalize
        extends BasePlanTest
{
    @Test
    public void testJoin()
            throws Exception
    {
        assertPlan("SELECT *\n" +
                        "FROM (\n" +
                        "    SELECT EXTRACT(DAY FROM DATE '2017-01-01')\n" +
                        ") t\n" +
                        "CROSS JOIN (VALUES 1)",
                anyTree(
                        join(INNER, ImmutableList.of(), Optional.empty(),
                                project(
                                        ImmutableMap.of("X", expression("BIGINT '1'")),
                                        values(ImmutableMap.of())),
                                values(ImmutableMap.of()))));
    }

    @Test
    public void testDuplicatesInWindowOrderBy()
            throws Exception
    {
        ExpectedValueProvider<WindowNode.Specification> specification = specification(
                ImmutableList.of(),
                ImmutableList.of("A"),
                ImmutableMap.of("A", SortOrder.ASC_NULLS_LAST));

        assertUnitPlan("WITH x as (SELECT a, a as b FROM (VALUES 1) t(a))" +
                        "SELECT *, row_number() OVER(ORDER BY a ASC, b DESC)" +
                        "FROM x",
                anyTree(
                        window(windowMatcherBuilder -> windowMatcherBuilder
                                        .specification(specification)
                                        .addFunction(functionCall("row_number", Optional.empty(), ImmutableList.of())),
                                values("A"))));
    }

    private void assertUnitPlan(@Language("SQL") String sql, PlanMatchPattern pattern)
    {
        LocalQueryRunner queryRunner = getQueryRunner();
        List<PlanOptimizer> optimizers = ImmutableList.of(
                new UnaliasSymbolReferences(),
                new IterativeOptimizer(new StatsRecorder(), ImmutableSet.of(
                        new RemoveRedundantIdentityProjections())));
        queryRunner.inTransaction(transactionSession -> {
            Plan actualPlan = queryRunner.createPlan(transactionSession, sql, optimizers);
            PlanAssert.assertPlan(transactionSession, queryRunner.getMetadata(), queryRunner.getCostCalculator(), actualPlan, pattern);
            return null;
        });
    }
}
