/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.pig.builtin;

import static org.apache.pig.builtin.mock.Storage.resetData;
import static org.apache.pig.builtin.mock.Storage.tuple;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.List;
import java.util.Random;
import java.util.Set;

import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.builtin.mock.Storage.Data;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.util.Utils;
import org.junit.Before;
import org.junit.Test;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

public class TestInvokerGenerator {
    private static PigServer pigServer;
    private static Random r;

    @Before
    public void setUp() throws Exception {
        pigServer = new PigServer(ExecType.LOCAL);
        r = new Random(42L);
    }

    @Test
    public void testConcat() throws Exception {
        Data data = resetData(pigServer);

        Set<Tuple> inputs = ImmutableSet.of(tuple("a"), tuple("b"), tuple("c"));
        Set<Tuple> expected = Sets.newHashSet();

        for (Tuple t : inputs) {
            String str = (String)t.get(0);
            expected.add(tuple(str.concat(str)));
        }

        data.set("foo", Utils.getSchemaFromString("x:chararray"), inputs);

        pigServer.registerQuery("define concat InvokerGenerator('java.lang.String','concat','String');");
        pigServer.registerQuery("a = load 'foo' using mock.Storage();");
        pigServer.registerQuery("b = foreach @ generate concat($0, $0);");
        pigServer.registerQuery("store b into 'bar' using mock.Storage();");

        List<Tuple> results = data.get("bar");
        assertEquals(expected.size(), results.size());
        for (Tuple t : results) {
            assertTrue(expected.remove(t));
        }
        assertEquals(0, expected.size());
    }

    @Test
    public void testValueOf() throws Exception {
        Data data = resetData(pigServer);

        Set<Tuple> inputs = Sets.newHashSet();
        while (inputs.size() < 1000) {
            inputs.add(tuple(Integer.toString(r.nextInt())));
        }
        Set<Tuple> expected = Sets.newHashSet();

        for (Tuple t : inputs) {
            String str = (String)t.get(0);
            expected.add(tuple(Integer.valueOf(str)));
        }

        data.set("foo", Utils.getSchemaFromString("x:chararray"), inputs);

        pigServer.registerQuery("define valueOf InvokerGenerator('java.lang.Integer','valueOf','String');");
        pigServer.registerQuery("a = load 'foo' using mock.Storage();");
        pigServer.registerQuery("b = foreach @ generate valueOf($0);");
        pigServer.registerQuery("store b into 'bar' using mock.Storage();");

        List<Tuple> results = data.get("bar");
        assertEquals(expected.size(), results.size());
        for (Tuple t : results) {
            assertTrue(expected.remove(t));
        }
        assertEquals(0, expected.size());
    }
}