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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.linux;

import static com.sun.jna.platform.unix.LibCAPI.HOST_NAME_MAX; // NOSONAR squid:S1191

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;

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

import com.sun.jna.Native;
import com.sun.jna.platform.linux.LibC;
import com.sun.jna.ptr.PointerByReference;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.jna.platform.linux.LinuxLibc;
import oshi.jna.platform.unix.CLibrary;
import oshi.jna.platform.unix.CLibrary.Addrinfo;
import oshi.software.common.AbstractNetworkParams;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;

/**
 * LinuxNetworkParams class.
 */
@ThreadSafe
final class LinuxNetworkParams extends AbstractNetworkParams {

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

    private static final LinuxLibc LIBC = LinuxLibc.INSTANCE;

    private static final String IPV4_DEFAULT_DEST = "0.0.0.0"; // NOSONAR
    private static final String IPV6_DEFAULT_DEST = "::/0";

    @Override
    public String getDomainName() {
        Addrinfo hint = new Addrinfo();
        hint.ai_flags = CLibrary.AI_CANONNAME;
        String hostname = "";
        try {
            hostname = InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            LOG.error("Unknown host exception when getting address of local host: {}", e.getMessage());
            return "";
        }
        PointerByReference ptr = new PointerByReference();
        int res = LIBC.getaddrinfo(hostname, null, hint, ptr);
        if (res > 0) {
            if (LOG.isErrorEnabled()) {
                LOG.error("Failed getaddrinfo(): {}", LIBC.gai_strerror(res));
            }
            return "";
        }
        Addrinfo info = new Addrinfo(ptr.getValue());
        String canonname = info.ai_canonname.trim();
        LIBC.freeaddrinfo(ptr.getValue());
        return canonname;
    }

    @Override
    public String getHostName() {
        byte[] hostnameBuffer = new byte[HOST_NAME_MAX + 1];
        if (0 != LibC.INSTANCE.gethostname(hostnameBuffer, hostnameBuffer.length)) {
            return super.getHostName();
        }
        return Native.toString(hostnameBuffer);
    }

    @Override
    public String getIpv4DefaultGateway() {
        List routes = ExecutingCommand.runNative("route -A inet -n");
        if (routes.size() <= 2) {
            return "";
        }

        String gateway = "";
        int minMetric = Integer.MAX_VALUE;

        for (int i = 2; i < routes.size(); i++) {
            String[] fields = ParseUtil.whitespaces.split(routes.get(i));
            if (fields.length > 4 && fields[0].equals(IPV4_DEFAULT_DEST)) {
                boolean isGateway = fields[3].indexOf('G') != -1;
                int metric = ParseUtil.parseIntOrDefault(fields[4], Integer.MAX_VALUE);
                if (isGateway && metric < minMetric) {
                    minMetric = metric;
                    gateway = fields[1];
                }
            }
        }
        return gateway;
    }

    @Override
    public String getIpv6DefaultGateway() {
        List routes = ExecutingCommand.runNative("route -A inet6 -n");
        if (routes.size() <= 2) {
            return "";
        }

        String gateway = "";
        int minMetric = Integer.MAX_VALUE;

        for (int i = 2; i < routes.size(); i++) {
            String[] fields = ParseUtil.whitespaces.split(routes.get(i));
            if (fields.length > 3 && fields[0].equals(IPV6_DEFAULT_DEST)) {
                boolean isGateway = fields[2].indexOf('G') != -1;
                int metric = ParseUtil.parseIntOrDefault(fields[3], Integer.MAX_VALUE);
                if (isGateway && metric < minMetric) {
                    minMetric = metric;
                    gateway = fields[1];
                }
            }
        }
        return gateway;
    }
}