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/*
 * Copyright 2021-2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.hardware.platform.unix.openbsd;

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

import java.util.function.Supplier;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.hardware.common.AbstractVirtualMemory;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
import oshi.util.tuples.Triplet;

/**
 * Memory info on OpenBSD
 */
@ThreadSafe
final class OpenBsdVirtualMemory extends AbstractVirtualMemory {

    private final OpenBsdGlobalMemory global;

    private final Supplier> usedTotalPgin = memoize(
            OpenBsdVirtualMemory::queryVmstat, defaultExpiration());
    private final Supplier pgout = memoize(OpenBsdVirtualMemory::queryUvm, defaultExpiration());

    OpenBsdVirtualMemory(OpenBsdGlobalMemory freeBsdGlobalMemory) {
        this.global = freeBsdGlobalMemory;
    }

    @Override
    public long getSwapUsed() {
        return usedTotalPgin.get().getA() * global.getPageSize();
    }

    @Override
    public long getSwapTotal() {
        return usedTotalPgin.get().getB() * global.getPageSize();
    }

    @Override
    public long getVirtualMax() {
        return this.global.getTotal() + getSwapTotal();
    }

    @Override
    public long getVirtualInUse() {
        return this.global.getTotal() - this.global.getAvailable() + getSwapUsed();
    }

    @Override
    public long getSwapPagesIn() {
        return usedTotalPgin.get().getC() * global.getPageSize();
    }

    @Override
    public long getSwapPagesOut() {
        return pgout.get() * global.getPageSize();
    }

    private static Triplet queryVmstat() {
        int used = 0;
        int total = 0;
        int swapIn = 0;
        for (String line : ExecutingCommand.runNative("vmstat -s")) {
            if (line.contains("swap pages in use")) {
                used = ParseUtil.getFirstIntValue(line);
            } else if (line.contains("swap pages")) {
                total = ParseUtil.getFirstIntValue(line);
            } else if (line.contains("pagein operations")) {
                swapIn = ParseUtil.getFirstIntValue(line);
            }
        }
        return new Triplet<>(used, total, swapIn);
    }

    private static int queryUvm() {
        for (String line : ExecutingCommand.runNative("systat -ab uvm")) {
            if (line.contains("pdpageouts")) {
                // First column is non-numeric "Constants" header
                return ParseUtil.getFirstIntValue(line);
            }
        }
        return 0;
    }
}