/*
 * Copyright (c) 2019, Red Hat Inc.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.test.lib.containers.cgroup;

import java.io.IOException;
import java.math.BigInteger;
import java.util.stream.IntStream;
import java.util.stream.Stream;

interface CgroupMetricsTester {

    public static final double ERROR_MARGIN = 0.1;
    public static final String EMPTY_STR = "";

    public void testMemorySubsystem();
    public void testCpuAccounting();
    public void testCpuSchedulingMetrics();
    public void testCpuSets();
    public void testCpuConsumption() throws IOException, InterruptedException;
    public void testMemoryUsage() throws Exception;
    public void testMisc();

    public static long convertStringToLong(String strval, long overflowRetval) {
        long retval = 0;
        if (strval == null) return 0L;

        try {
            retval = Long.parseLong(strval);
        } catch (NumberFormatException e) {
            // For some properties (e.g. memory.limit_in_bytes) we may overflow the range of signed long.
            // In this case, return Long.MAX_VALUE
            BigInteger b = new BigInteger(strval);
            if (b.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
                return overflowRetval;
            }
        }
        return retval;
    }

    public static boolean compareWithErrorMargin(long oldVal, long newVal) {
        return Math.abs(oldVal - newVal) <= Math.abs(oldVal * ERROR_MARGIN);
    }

    public static boolean compareWithErrorMargin(double oldVal, double newVal) {
        return Math.abs(oldVal - newVal) <= Math.abs(oldVal * ERROR_MARGIN);
    }

    public static void fail(String controller, String metric, long oldVal, long testVal) {
        throw new RuntimeException("Test failed for - " + controller + ":"
                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
    }

    public static void fail(String controller, String metric, String oldVal, String testVal) {
        throw new RuntimeException("Test failed for - " + controller + ":"
                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
    }

    public static void fail(String controller, String metric, double oldVal, double testVal) {
        throw new RuntimeException("Test failed for - " + controller + ":"
                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
    }

    public static void fail(String controller, String metric, boolean oldVal, boolean testVal) {
        throw new RuntimeException("Test failed for - " + controller + ":"
                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
    }

    public static void warn(String controller, String metric, long oldVal, long testVal) {
        System.err.println("Warning - " + controller + ":" + metric
                + ", expected [" + oldVal + "], got [" + testVal + "]");
    }

    public static Integer[] convertCpuSetsToArray(String cpusstr) {
        if (cpusstr == null || EMPTY_STR.equals(cpusstr)) {
            return new Integer[0];
        }
        // Parse range string in the format 1,2-6,7
        Integer[] cpuSets = Stream.of(cpusstr.split(",")).flatMap(a -> {
            if (a.contains("-")) {
                String[] range = a.split("-");
                return IntStream.rangeClosed(Integer.parseInt(range[0]),
                        Integer.parseInt(range[1])).boxed();
            } else {
                return Stream.of(Integer.parseInt(a));
            }
        }).toArray(Integer[]::new);
        return cpuSets;
    }

}