/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.android.cts.filesystemperf;

import android.cts.util.TimeoutReq;
import com.android.cts.util.MeasureRun;
import com.android.cts.util.MeasureTime;
import com.android.cts.util.ResultType;
import com.android.cts.util.ResultUnit;
import android.cts.util.CtsAndroidTestCase;
import com.android.cts.util.ReportLog;
import com.android.cts.util.Stat;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class SequentialRWTest extends CtsAndroidTestCase {
    private static final String DIR_SEQ_WR = "SEQ_WR";
    private static final String DIR_SEQ_UPDATE = "SEQ_UPDATE";
    private static final String DIR_SEQ_RD = "SEQ_RD";
    private static final int BUFFER_SIZE = 10 * 1024 * 1024;

    @Override
    protected void tearDown() throws Exception {
        FileUtil.removeFileOrDir(getContext(), DIR_SEQ_WR);
        FileUtil.removeFileOrDir(getContext(), DIR_SEQ_UPDATE);
        FileUtil.removeFileOrDir(getContext(), DIR_SEQ_RD);
        super.tearDown();
    }

    @TimeoutReq(minutes = 30)
    public void testSingleSequentialWrite() throws Exception {
        final long fileSize = FileUtil.getFileSizeExceedingMemory(getContext(), BUFFER_SIZE);
        if (fileSize == 0) { // not enough space, give up
            return;
        }
        final int numberOfFiles =(int)(fileSize / BUFFER_SIZE);
        getReportLog().printValue("files", numberOfFiles, ResultType.NEUTRAL,
                ResultUnit.COUNT);
        final byte[] data = FileUtil.generateRandomData(BUFFER_SIZE);
        final File[] files = FileUtil.createNewFiles(getContext(), DIR_SEQ_WR,
                numberOfFiles);
        double[] rdAmount = new double[numberOfFiles];
        double[] wrAmount = new double[numberOfFiles];
        double[] times = FileUtil.measureIO(numberOfFiles, rdAmount, wrAmount, new MeasureRun() {

            @Override
            public void run(int i) throws IOException {
                FileUtil.writeFile(files[i], data, false);
            }
        });
        double[] mbps = ReportLog.calcRatePerSecArray((double)BUFFER_SIZE / 1024 / 1024, times);
        getReportLog().printArray("write throughput",
                mbps, ResultType.HIGHER_BETTER, ResultUnit.MBPS);
        getReportLog().printArray("write amount", wrAmount, ResultType.NEUTRAL,
                ResultUnit.BYTE);
        Stat.StatResult stat = Stat.getStat(mbps);
        getReportLog().printSummary("write throughput", stat.mAverage, ResultType.HIGHER_BETTER,
                ResultUnit.MBPS);
    }

    @TimeoutReq(minutes = 60)
    public void testSingleSequentialUpdate() throws Exception {
        final long fileSize = FileUtil.getFileSizeExceedingMemory(getContext(), BUFFER_SIZE);
        if (fileSize == 0) { // not enough space, give up
            return;
        }
        final int NUMBER_REPETITION = 6;
        FileUtil.doSequentialUpdateTest(getContext(), DIR_SEQ_UPDATE, getReportLog(), fileSize,
                BUFFER_SIZE, NUMBER_REPETITION);
    }

    @TimeoutReq(minutes = 30)
    public void testSingleSequentialRead() throws Exception {
        final long fileSize = FileUtil.getFileSizeExceedingMemory(getContext(), BUFFER_SIZE);
        if (fileSize == 0) { // not enough space, give up
            return;
        }
        long start = System.currentTimeMillis();
        final File file = FileUtil.createNewFilledFile(getContext(),
                DIR_SEQ_RD, fileSize);
        long finish = System.currentTimeMillis();
        getReportLog().printValue("write throughput for test file of length " + fileSize,
                ReportLog.calcRatePerSec((double)fileSize / 1024 / 1024, finish - start),
                ResultType.HIGHER_BETTER, ResultUnit.MBPS);

        final int NUMBER_READ = 10;

        final byte[] data = new byte[BUFFER_SIZE];
        double[] times = MeasureTime.measure(NUMBER_READ, new MeasureRun() {

            @Override
            public void run(int i) throws IOException {
                final FileInputStream in = new FileInputStream(file);
                long read = 0;
                while (read < fileSize) {
                    in.read(data);
                    read += BUFFER_SIZE;
                }
                in.close();
            }
        });
        double[] mbps = ReportLog.calcRatePerSecArray((double)fileSize / 1024 / 1024, times);
        getReportLog().printArray("read throughput",
                mbps, ResultType.HIGHER_BETTER, ResultUnit.MBPS);
        Stat.StatResult stat = Stat.getStat(mbps);
        getReportLog().printSummary("read throughput", stat.mAverage, ResultType.HIGHER_BETTER,
                ResultUnit.MBPS);
    }
}