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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.freebsd;

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.VirtualMemory;
import oshi.hardware.common.AbstractGlobalMemory;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
import oshi.util.platform.unix.freebsd.BsdSysctlUtil;

/**
 * Memory obtained by sysctl vm.stats
 */
@ThreadSafe
final class FreeBsdGlobalMemory extends AbstractGlobalMemory {

    private final Supplier available = memoize(this::queryVmStats, defaultExpiration());

    private final Supplier total = memoize(FreeBsdGlobalMemory::queryPhysMem);

    private final Supplier pageSize = memoize(FreeBsdGlobalMemory::queryPageSize);

    private final Supplier vm = memoize(this::createVirtualMemory);

    @Override
    public long getAvailable() {
        return available.get();
    }

    @Override
    public long getTotal() {
        return total.get();
    }

    @Override
    public long getPageSize() {
        return pageSize.get();
    }

    @Override
    public VirtualMemory getVirtualMemory() {
        return vm.get();
    }

    private long queryVmStats() {
        // cached removed in FreeBSD 12 but was always set to 0
        int inactive = BsdSysctlUtil.sysctl("vm.stats.vm.v_inactive_count", 0);
        int free = BsdSysctlUtil.sysctl("vm.stats.vm.v_free_count", 0);
        return (inactive + free) * getPageSize();
    }

    private static long queryPhysMem() {
        return BsdSysctlUtil.sysctl("hw.physmem", 0L);
    }

    private static long queryPageSize() {
        // sysctl hw.pagesize doesn't work on FreeBSD 13
        return ParseUtil.parseLongOrDefault(ExecutingCommand.getFirstAnswer("sysconf PAGESIZE"), 4096L);
    }

    private VirtualMemory createVirtualMemory() {
        return new FreeBsdVirtualMemory(this);
    }
}