/*
 * Copyright 2009-2012 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.hyracks.storage.am.lsm.invertedindex.common;

import java.io.IOException;

import org.junit.Test;

import edu.uci.ics.hyracks.storage.am.common.api.IIndex;
import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
import edu.uci.ics.hyracks.storage.am.common.datagen.TupleGenerator;
import edu.uci.ics.hyracks.storage.am.config.AccessMethodTestsConfig;
import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util.LSMInvertedIndexTestContext;
import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util.LSMInvertedIndexTestContext.InvertedIndexType;
import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util.LSMInvertedIndexTestUtils;

public abstract class AbstractInvertedIndexDeleteTest extends AbstractInvertedIndexTest {

    protected final int numInsertRounds = AccessMethodTestsConfig.LSM_INVINDEX_NUM_INSERT_ROUNDS;
    protected final int numDeleteRounds = AccessMethodTestsConfig.LSM_INVINDEX_NUM_DELETE_ROUNDS;
    protected final boolean bulkLoad;

    public AbstractInvertedIndexDeleteTest(InvertedIndexType invIndexType, boolean bulkLoad) {
        super(invIndexType);
        this.bulkLoad = bulkLoad;
    }

    protected void runTest(LSMInvertedIndexTestContext testCtx, TupleGenerator tupleGen) throws IOException,
            IndexException {
        IIndex invIndex = testCtx.getIndex();
        invIndex.create();
        invIndex.activate();

        for (int i = 0; i < numInsertRounds; i++) {
            // Start generating documents ids from 0 again.
            tupleGen.reset();

            if (bulkLoad) {
                LSMInvertedIndexTestUtils.bulkLoadInvIndex(testCtx, tupleGen, NUM_DOCS_TO_INSERT);
            } else {
                LSMInvertedIndexTestUtils.insertIntoInvIndex(testCtx, tupleGen, NUM_DOCS_TO_INSERT);
            }

            // Delete all documents in a couple of rounds.
            int numTuplesPerDeleteRound = (int) Math.ceil((float) testCtx.getDocumentCorpus().size()
                    / (float) numDeleteRounds);
            for (int j = 0; j < numDeleteRounds; j++) {
                LSMInvertedIndexTestUtils.deleteFromInvIndex(testCtx, harness.getRandom(), numTuplesPerDeleteRound);
                validateAndCheckIndex(testCtx);
                runTinySearchWorkload(testCtx, tupleGen);
            }
        }

        invIndex.deactivate();
        invIndex.destroy();
    }

    @Test
    public void wordTokensInvIndexTest() throws IOException, IndexException {
        LSMInvertedIndexTestContext testCtx = LSMInvertedIndexTestUtils.createWordInvIndexTestContext(harness, invIndexType);
        TupleGenerator tupleGen = LSMInvertedIndexTestUtils.createStringDocumentTupleGen(harness.getRandom());
        runTest(testCtx, tupleGen);
    }

    @Test
    public void hashedWordTokensInvIndexTest() throws IOException, IndexException {
        LSMInvertedIndexTestContext testCtx = LSMInvertedIndexTestUtils.createHashedWordInvIndexTestContext(harness,
                invIndexType);
        TupleGenerator tupleGen = LSMInvertedIndexTestUtils.createStringDocumentTupleGen(harness.getRandom());
        runTest(testCtx, tupleGen);
    }

    @Test
    public void ngramTokensInvIndexTest() throws IOException, IndexException {
        LSMInvertedIndexTestContext testCtx = LSMInvertedIndexTestUtils.createNGramInvIndexTestContext(harness, invIndexType);
        TupleGenerator tupleGen = LSMInvertedIndexTestUtils.createPersonNamesTupleGen(harness.getRandom());
        runTest(testCtx, tupleGen);
    }

    @Test
    public void hashedNGramTokensInvIndexTest() throws IOException, IndexException {
        LSMInvertedIndexTestContext testCtx = LSMInvertedIndexTestUtils.createHashedNGramInvIndexTestContext(harness,
                invIndexType);
        TupleGenerator tupleGen = LSMInvertedIndexTestUtils.createPersonNamesTupleGen(harness.getRandom());
        runTest(testCtx, tupleGen);
    }
}