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/**
 * MIT License
 *
 * Copyright (c) 2010 - 2020 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.software.os.unix.freebsd;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.software.common.AbstractFileSystem;
import oshi.software.os.OSFileStore;
import oshi.software.os.linux.LinuxOSFileStore;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
import oshi.util.platform.unix.freebsd.BsdSysctlUtil;

/**
 * The Solaris File System contains {@link oshi.software.os.OSFileStore}s which
 * are a storage pool, device, partition, volume, concrete file system or other
 * implementation specific means of file storage. In Linux, these are found in
 * the /proc/mount filesystem, excluding temporary and kernel mounts.
 */
@ThreadSafe
public final class FreeBsdFileSystem extends AbstractFileSystem {

    // System path mounted as tmpfs
    private static final List TMP_FS_PATHS = Arrays.asList("/system", "/tmp", "/dev/fd");

    @Override
    public List getFileStores(boolean localOnly) {
        // Find any partition UUIDs and map them
        Map uuidMap = new HashMap<>();
        // Now grab dmssg output
        String device = "";
        for (String line : ExecutingCommand.runNative("geom part list")) {
            if (line.contains("Name: ")) {
                device = line.substring(line.lastIndexOf(' ') + 1);
            }
            // If we aren't working with a current partition, continue
            if (device.isEmpty()) {
                continue;
            }
            line = line.trim();
            if (line.startsWith("rawuuid:")) {
                uuidMap.put(device, line.substring(line.lastIndexOf(' ') + 1));
                device = "";
            }
        }

        List fsList = new ArrayList<>();

        // Get inode usage data
        Map inodeFreeMap = new HashMap<>();
        Map inodeTotalMap = new HashMap<>();
        for (String line : ExecutingCommand.runNative("df -i")) {
            /*- Sample Output:
            Filesystem    1K-blocks   Used   Avail Capacity iused  ifree %iused  Mounted on
            /dev/twed0s1a   2026030 584112 1279836    31%    2751 279871    1%   /
            */
            if (line.startsWith("/")) {
                String[] split = ParseUtil.whitespaces.split(line);
                if (split.length > 7) {
                    inodeFreeMap.put(split[0], ParseUtil.parseLongOrDefault(split[6], 0L));
                    // total is used + free
                    inodeTotalMap.put(split[0],
                            inodeFreeMap.get(split[0]) + ParseUtil.parseLongOrDefault(split[5], 0L));
                }
            }
        }

        // Get mount table
        for (String fs : ExecutingCommand.runNative("mount -p")) {
            String[] split = ParseUtil.whitespaces.split(fs);
            if (split.length < 5) {
                continue;
            }
            // 1st field is volume name
            // 2nd field is mount point
            // 3rd field is fs type
            // 4th field is options
            // other fields ignored
            String volume = split[0];
            String path = split[1];
            String type = split[2];
            String options = split[3];

            // Skip non-local drives if requested, and exclude pseudo file systems
            if ((localOnly && NETWORK_FS_TYPES.contains(type)) || PSEUDO_FS_TYPES.contains(type) || path.equals("/dev")
                    || ParseUtil.filePathStartsWith(TMP_FS_PATHS, path)
                    || volume.startsWith("rpool") && !path.equals("/")) {
                continue;
            }

            String name = path.substring(path.lastIndexOf('/') + 1);
            // Special case for /, pull last element of volume instead
            if (name.isEmpty()) {
                name = volume.substring(volume.lastIndexOf('/') + 1);
            }
            File f = new File(path);
            long totalSpace = f.getTotalSpace();
            long usableSpace = f.getUsableSpace();
            long freeSpace = f.getFreeSpace();

            String description;
            if (volume.startsWith("/dev") || path.equals("/")) {
                description = "Local Disk";
            } else if (volume.equals("tmpfs")) {
                description = "Ram Disk";
            } else if (NETWORK_FS_TYPES.contains(type)) {
                description = "Network Disk";
            } else {
                description = "Mount Point";
            }
            // Match UUID
            String uuid = uuidMap.getOrDefault(name, "");

            fsList.add(new LinuxOSFileStore(name, volume, name, path, options, uuid, "", description, type, freeSpace,
                    usableSpace, totalSpace, inodeFreeMap.containsKey(path) ? inodeFreeMap.get(path) : 0L,
                    inodeTotalMap.containsKey(path) ? inodeTotalMap.get(path) : 0L));
        }
        return fsList;
    }

    @Override
    public long getOpenFileDescriptors() {
        return BsdSysctlUtil.sysctl("kern.openfiles", 0);
    }

    @Override
    public long getMaxFileDescriptors() {
        return BsdSysctlUtil.sysctl("kern.maxfiles", 0);
    }
}