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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.util.platform.unix.freebsd;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;

/**
 * Reads from procstat into a map
 */
@ThreadSafe
public final class ProcstatUtil {

    private ProcstatUtil() {
    }

    /**
     * Gets a map containing current working directory info
     *
     * @param pid
     *            a process ID, optional
     * @return a map of process IDs to their current working directory. If
     *         {@code pid} is a negative number, all processes are returned;
     *         otherwise the map may contain only a single element for {@code pid}
     */
    public static Map getCwdMap(int pid) {
        List procstat = ExecutingCommand.runNative("procstat -f " + (pid < 0 ? "-a" : pid));
        Map cwdMap = new HashMap<>();
        for (String line : procstat) {
            String[] split = ParseUtil.whitespaces.split(line.trim(), 10);
            if (split.length == 10 && split[2].equals("cwd")) {
                cwdMap.put(ParseUtil.parseIntOrDefault(split[0], -1), split[9]);
            }
        }
        return cwdMap;
    }

    /**
     * Gets current working directory info
     *
     * @param pid
     *            a process ID
     * @return the current working directory for that process.
     */
    public static String getCwd(int pid) {
        List procstat = ExecutingCommand.runNative("procstat -f " + pid);
        for (String line : procstat) {
            String[] split = ParseUtil.whitespaces.split(line.trim(), 10);
            if (split.length == 10 && split[2].equals("cwd")) {
                return split[9];
            }
        }
        return "";
    }

    /**
     * Gets open files
     *
     * @param pid
     *            The process ID
     * @return the number of open files.
     */
    public static long getOpenFiles(int pid) {
        long fd = 0L;
        List procstat = ExecutingCommand.runNative("procstat -f " + pid);
        for (String line : procstat) {
            String[] split = ParseUtil.whitespaces.split(line.trim(), 10);
            if (split.length == 10 && !"Vd-".contains(split[4])) {
                fd++;
            }
        }
        return fd;
    }
}