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/**
 * MIT License
 *
 * Copyright (c) 2010 - 2021 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package oshi.hardware.platform.unix.solaris;

import static oshi.util.Memoizer.defaultExpiration;
import static oshi.util.Memoizer.memoize;

import java.util.function.Supplier;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.driver.unix.solaris.kstat.SystemPages;
import oshi.hardware.common.AbstractVirtualMemory;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
import oshi.util.tuples.Pair;

/**
 * Memory obtained by kstat and swap
 */
@ThreadSafe
final class SolarisVirtualMemory extends AbstractVirtualMemory {

    private static final Pattern SWAP_INFO = Pattern.compile(".+\\s(\\d+)K\\s+(\\d+)K$");

    private final SolarisGlobalMemory global;

    // Physical
    private final Supplier> availTotal = memoize(SystemPages::queryAvailableTotal,
            defaultExpiration());

    // Swap
    private final Supplier> usedTotal = memoize(SolarisVirtualMemory::querySwapInfo,
            defaultExpiration());

    private final Supplier pagesIn = memoize(SolarisVirtualMemory::queryPagesIn, defaultExpiration());

    private final Supplier pagesOut = memoize(SolarisVirtualMemory::queryPagesOut, defaultExpiration());

    /**
     * Constructor for SolarisVirtualMemory.
     *
     * @param solarisGlobalMemory
     *            The parent global memory class instantiating this
     */
    SolarisVirtualMemory(SolarisGlobalMemory solarisGlobalMemory) {
        this.global = solarisGlobalMemory;
    }

    @Override
    public long getSwapUsed() {
        return usedTotal.get().getA();
    }

    @Override
    public long getSwapTotal() {
        return usedTotal.get().getB();
    }

    @Override
    public long getVirtualMax() {
        return this.global.getPageSize() * availTotal.get().getB() + getSwapTotal();
    }

    @Override
    public long getVirtualInUse() {
        return this.global.getPageSize() * (availTotal.get().getB() - availTotal.get().getA()) + getSwapUsed();
    }

    @Override
    public long getSwapPagesIn() {
        return pagesIn.get();
    }

    @Override
    public long getSwapPagesOut() {
        return pagesOut.get();
    }

    private static long queryPagesIn() {
        long swapPagesIn = 0L;
        for (String s : ExecutingCommand.runNative("kstat -p cpu_stat:::pgswapin")) {
            swapPagesIn += ParseUtil.parseLastLong(s, 0L);
        }
        return swapPagesIn;
    }

    private static long queryPagesOut() {
        long swapPagesOut = 0L;
        for (String s : ExecutingCommand.runNative("kstat -p cpu_stat:::pgswapout")) {
            swapPagesOut += ParseUtil.parseLastLong(s, 0L);
        }
        return swapPagesOut;
    }

    private static Pair querySwapInfo() {
        long swapTotal = 0L;
        long swapUsed = 0L;
        String swap = ExecutingCommand.getAnswerAt("swap -lk", 1);
        Matcher m = SWAP_INFO.matcher(swap);
        if (m.matches()) {
            swapTotal = ParseUtil.parseLongOrDefault(m.group(1), 0L) << 10;
            swapUsed = swapTotal - (ParseUtil.parseLongOrDefault(m.group(2), 0L) << 10);
        }
        return new Pair<>(swapUsed, swapTotal);
    }
}