/**
 * Copyright (C) 2009-2013 FoundationDB, LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.foundationdb.sql.optimizer;

import com.foundationdb.junit.NamedParameterizedRunner;
import com.foundationdb.junit.Parameterization;
import com.foundationdb.junit.ParameterizationBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.yaml.snakeyaml.Yaml;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import static org.junit.Assert.assertEquals;

@RunWith(NamedParameterizedRunner.class)
public final class DistinctEliminatorSimpleTest extends DistinctEliminatorTestBase {

    private static final File SIMPLE_TEST = new File(RESOURCE_DIR, "simple-distincts.yaml");

    @NamedParameterizedRunner.TestParameters
    public static Collection<Parameterization> statements() throws Exception {
        FileReader fileReader = new FileReader(SIMPLE_TEST);
        try {
            ParameterizationBuilder pb = new ParameterizationBuilder();
            BufferedReader buffered = new BufferedReader(fileReader);
            Yaml yaml = new Yaml();
            for (Object objRaw : yaml.loadAll(buffered)) {
                List<?> asList = (List<?>) objRaw;
                for (Object lineRaw : asList) {
                    Map<?,?> line = (Map<?,?>) lineRaw;
                    if (line.size() != 1)
                        throw new RuntimeException("need key-val pair:" + line);
                    String actionStr = (String) line.keySet().iterator().next();
                    String sql = (String) line.get(actionStr);

                    String name = sql;
                    if (name.startsWith("SELECT DISTINCT"))
                        name = name.substring("SELECT DISTINCT".length());

                    KeepOrOptimize action = KeepOrOptimize.valueOf(actionStr.toUpperCase());
                    pb.create(name, action != KeepOrOptimize.IGNORED, sql,  action);
                }
            }
            return pb.asList();
        }
        finally {
            fileReader.close();
        }
    }

    @Test
    public void test() throws Exception {
        if (!sql.toUpperCase().contains("DISTINCT"))
            throw new RuntimeException("original didn't have DISTINCT");
        String optimized = optimized();
        KeepOrOptimize distinctActualOptimized = optimized.contains("DISTINCT")
                ? KeepOrOptimize.KEPT
                : KeepOrOptimize.OPTIMIZED;
        assertEquals(optimized, distinctExpectedOptimized, distinctActualOptimized);
        
    }

    public DistinctEliminatorSimpleTest(String sql, KeepOrOptimize distinctExpectedOptimized) {
        super(sql, sql, null, null);
        this.distinctExpectedOptimized = distinctExpectedOptimized;
    }
    
    public final KeepOrOptimize distinctExpectedOptimized;
    
    private enum KeepOrOptimize {
        KEPT, OPTIMIZED, IGNORED
    }
}