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/*
 * Copyright 2016-2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.software.os.mac;

import static oshi.software.os.OSService.State.RUNNING;
import static oshi.software.os.OSService.State.STOPPED;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Properties;
import java.util.Set;
import java.util.stream.Collectors;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.jna.platform.mac.SystemB;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.driver.mac.Who;
import oshi.driver.mac.WindowInfo;
import oshi.jna.Struct.CloseableProcTaskInfo;
import oshi.jna.Struct.CloseableTimeval;
import oshi.software.common.AbstractOperatingSystem;
import oshi.software.os.FileSystem;
import oshi.software.os.InternetProtocolStats;
import oshi.software.os.NetworkParams;
import oshi.software.os.OSDesktopWindow;
import oshi.software.os.OSProcess;
import oshi.software.os.OSProcess.State;
import oshi.software.os.OSService;
import oshi.software.os.OSSession;
import oshi.util.ExecutingCommand;
import oshi.util.FileUtil;
import oshi.util.ParseUtil;
import oshi.util.Util;
import oshi.util.platform.mac.SysctlUtil;
import oshi.util.tuples.Pair;

/**
 * macOS, previously Mac OS X and later OS X) is a series of proprietary graphical operating systems developed and
 * marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers.
 */
@ThreadSafe
public class MacOperatingSystem extends AbstractOperatingSystem {

    private static final Logger LOG = LoggerFactory.getLogger(MacOperatingSystem.class);

    public static final String MACOS_VERSIONS_PROPERTIES = "oshi.macos.versions.properties";

    private static final String SYSTEM_LIBRARY_LAUNCH_AGENTS = "/System/Library/LaunchAgents";
    private static final String SYSTEM_LIBRARY_LAUNCH_DAEMONS = "/System/Library/LaunchDaemons";

    private int maxProc = 1024;

    private final String osXVersion;
    private final int major;
    private final int minor;

    private static final long BOOTTIME;
    static {
        try (CloseableTimeval tv = new CloseableTimeval()) {
            if (!SysctlUtil.sysctl("kern.boottime", tv) || tv.tv_sec.longValue() == 0L) {
                // Usually this works. If it doesn't, fall back to text parsing.
                // Boot time will be the first consecutive string of digits.
                BOOTTIME = ParseUtil.parseLongOrDefault(
                        ExecutingCommand.getFirstAnswer("sysctl -n kern.boottime").split(",")[0].replaceAll("\\D", ""),
                        System.currentTimeMillis() / 1000);
            } else {
                // tv now points to a 64-bit timeval structure for boot time.
                // First 4 bytes are seconds, second 4 bytes are microseconds
                // (we ignore)
                BOOTTIME = tv.tv_sec.longValue();
            }
        }
    }

    public MacOperatingSystem() {
        String version = System.getProperty("os.version");
        int verMajor = ParseUtil.getFirstIntValue(version);
        int verMinor = ParseUtil.getNthIntValue(version, 2);
        // Big Sur (11.x) may return 10.16
        if (verMajor == 10 && verMinor > 15) {
            String swVers = ExecutingCommand.getFirstAnswer("sw_vers -productVersion");
            if (!swVers.isEmpty()) {
                version = swVers;
            }
            verMajor = ParseUtil.getFirstIntValue(version);
            verMinor = ParseUtil.getNthIntValue(version, 2);
        }
        this.osXVersion = version;
        this.major = verMajor;
        this.minor = verMinor;
        // Set max processes
        this.maxProc = SysctlUtil.sysctl("kern.maxproc", 0x1000);
    }

    @Override
    public String queryManufacturer() {
        return "Apple";
    }

    @Override
    public Pair queryFamilyVersionInfo() {
        String family = this.major > 10 || (this.major == 10 && this.minor >= 12) ? "macOS"
                : System.getProperty("os.name");
        String codeName = parseCodeName();
        String buildNumber = SysctlUtil.sysctl("kern.osversion", "");
        return new Pair<>(family, new OSVersionInfo(this.osXVersion, codeName, buildNumber));
    }

    private String parseCodeName() {
        Properties verProps = FileUtil.readPropertiesFromFilename(MACOS_VERSIONS_PROPERTIES);
        String codeName = null;
        if (this.major > 10) {
            codeName = verProps.getProperty(Integer.toString(this.major));
        } else if (this.major == 10) {
            codeName = verProps.getProperty(this.major + "." + this.minor);
        }
        if (Util.isBlank(codeName)) {
            LOG.warn("Unable to parse version {}.{} to a codename.", this.major, this.minor);
        }
        return codeName;
    }

    @Override
    protected int queryBitness(int jvmBitness) {
        if (jvmBitness == 64 || (this.major == 10 && this.minor > 6)) {
            return 64;
        }
        return ParseUtil.parseIntOrDefault(ExecutingCommand.getFirstAnswer("getconf LONG_BIT"), 32);
    }

    @Override
    public FileSystem getFileSystem() {
        return new MacFileSystem();
    }

    @Override
    public InternetProtocolStats getInternetProtocolStats() {
        return new MacInternetProtocolStats(isElevated());
    }

    @Override
    public List getSessions() {
        return USE_WHO_COMMAND ? super.getSessions() : Who.queryUtxent();
    }

    @Override
    public List queryAllProcesses() {
        List procs = new ArrayList<>();
        int[] pids = new int[this.maxProc];
        Arrays.fill(pids, -1);
        int numberOfProcesses = SystemB.INSTANCE.proc_listpids(SystemB.PROC_ALL_PIDS, 0, pids,
                pids.length * SystemB.INT_SIZE) / SystemB.INT_SIZE;
        for (int i = 0; i < numberOfProcesses; i++) {
            if (pids[i] >= 0) {
                OSProcess proc = getProcess(pids[i]);
                if (proc != null) {
                    procs.add(proc);
                }
            }
        }
        return procs;
    }

    @Override
    public OSProcess getProcess(int pid) {
        OSProcess proc = new MacOSProcess(pid, this.major, this.minor, this);
        return proc.getState().equals(State.INVALID) ? null : proc;
    }

    @Override
    public List queryChildProcesses(int parentPid) {
        List allProcs = queryAllProcesses();
        Set descendantPids = getChildrenOrDescendants(allProcs, parentPid, false);
        return allProcs.stream().filter(p -> descendantPids.contains(p.getProcessID())).collect(Collectors.toList());
    }

    @Override
    public List queryDescendantProcesses(int parentPid) {
        List allProcs = queryAllProcesses();
        Set descendantPids = getChildrenOrDescendants(allProcs, parentPid, true);
        return allProcs.stream().filter(p -> descendantPids.contains(p.getProcessID())).collect(Collectors.toList());
    }

    @Override
    public int getProcessId() {
        return SystemB.INSTANCE.getpid();
    }

    @Override
    public int getProcessCount() {
        return SystemB.INSTANCE.proc_listpids(SystemB.PROC_ALL_PIDS, 0, null, 0) / SystemB.INT_SIZE;
    }

    @Override
    public int getThreadCount() {
        // Get current pids, then slightly pad in case new process starts while
        // allocating array space
        int[] pids = new int[getProcessCount() + 10];
        int numberOfProcesses = SystemB.INSTANCE.proc_listpids(SystemB.PROC_ALL_PIDS, 0, pids, pids.length)
                / SystemB.INT_SIZE;
        int numberOfThreads = 0;
        try (CloseableProcTaskInfo taskInfo = new CloseableProcTaskInfo()) {
            for (int i = 0; i < numberOfProcesses; i++) {
                int exit = SystemB.INSTANCE.proc_pidinfo(pids[i], SystemB.PROC_PIDTASKINFO, 0, taskInfo,
                        taskInfo.size());
                if (exit != -1) {
                    numberOfThreads += taskInfo.pti_threadnum;
                }
            }
        }
        return numberOfThreads;
    }

    @Override
    public long getSystemUptime() {
        return System.currentTimeMillis() / 1000 - BOOTTIME;
    }

    @Override
    public long getSystemBootTime() {
        return BOOTTIME;
    }

    @Override
    public NetworkParams getNetworkParams() {
        return new MacNetworkParams();
    }

    @Override
    public List getServices() {
        // Get running services
        List services = new ArrayList<>();
        Set running = new HashSet<>();
        for (OSProcess p : getChildProcesses(1, ProcessFiltering.ALL_PROCESSES, ProcessSorting.PID_ASC, 0)) {
            OSService s = new OSService(p.getName(), p.getProcessID(), RUNNING);
            services.add(s);
            running.add(p.getName());
        }
        // Get Directories for stopped services
        ArrayList files = new ArrayList<>();
        File dir = new File(SYSTEM_LIBRARY_LAUNCH_AGENTS);
        if (dir.exists() && dir.isDirectory()) {
            files.addAll(Arrays.asList(dir.listFiles((f, name) -> name.toLowerCase().endsWith(".plist"))));
        } else {
            LOG.error("Directory: /System/Library/LaunchAgents does not exist");
        }
        dir = new File(SYSTEM_LIBRARY_LAUNCH_DAEMONS);
        if (dir.exists() && dir.isDirectory()) {
            files.addAll(Arrays.asList(dir.listFiles((f, name) -> name.toLowerCase().endsWith(".plist"))));
        } else {
            LOG.error("Directory: /System/Library/LaunchDaemons does not exist");
        }
        for (File f : files) {
            // remove .plist extension
            String name = f.getName().substring(0, f.getName().length() - 6);
            int index = name.lastIndexOf('.');
            String shortName = (index < 0 || index > name.length() - 2) ? name : name.substring(index + 1);
            if (!running.contains(name) && !running.contains(shortName)) {
                OSService s = new OSService(name, 0, STOPPED);
                services.add(s);
            }
        }
        return services;
    }

    @Override
    public List getDesktopWindows(boolean visibleOnly) {
        return WindowInfo.queryDesktopWindows(visibleOnly);
    }
}