package com.tongran.agent.client.utils;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.snmp4j.smi.OID;
import oshi.hardware.NetworkIF;

import java.io.FileOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.temporal.ChronoUnit;
import java.util.*;

public class AgentUtil {

    public static String getMotherboardUUID() {
        String hostName = getHostname();
        String primaryIp = getPrimaryIp();
//        SystemInfo si = new SystemInfo();
//        HardwareAbstractionLayer hal = si.getHardware();
//        Baseboard baseboard = hal.getComputerSystem().getBaseboard();
//        if(StringUtils.isNotBlank(baseboard.getSerialNumber())){
//            return baseboard.getSerialNumber();
//        }
        return hostName+":"+primaryIp;
    }

    public static String getHostname() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            return "unknown-host";
        }
    }

    /**
     * 获取本机首选 IP 地址（通常是第一个非回环、非虚拟网卡的 IPv4 地址）
     */
    public static String getPrimaryIp() {
        try {
            InetAddress localHost = InetAddress.getLocalHost();
            String ip = localHost.getHostAddress();

            // 如果是 127.x.x.x，说明可能 hosts 配置有问题，需要手动查找
            if (ip.startsWith("127.")) {
                return getExternalIp();
            }
            return ip;
        } catch (UnknownHostException e) {
            return "127.0.0.1";
        }
    }

    /**
     * 获取第一个非回环、非虚拟网卡的 IPv4 地址
     */
    public static String getExternalIp() {
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface iface = interfaces.nextElement();
                // 跳过虚拟网卡（如 docker, veth, lo）
                if (iface.isLoopback() || iface.isVirtual() || !iface.isUp()) {
                    continue;
                }
                Enumeration<InetAddress> addresses = iface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress addr = addresses.nextElement();
                    if (addr.isLoopbackAddress()) {
                        continue; // 跳过 127.0.0.1
                    }
                    if (addr.getHostAddress().contains(":")) {
                        continue; // 跳过 IPv6
                    }
                    return addr.getHostAddress();
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return "127.0.0.1";
    }


    public static String toJsonString(List<Map<String, String>> list) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            return mapper.writeValueAsString(list);
        } catch (Exception e) {
            throw new RuntimeException("JSON转换失败", e);
        }
    }

    public static void base64ToFile(String base64String, String filePath) throws IOException {
        // 解码Base64字符串
        byte[] decodedBytes = Base64.getDecoder().decode(base64String);

        // 写入文件
        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            fos.write(decodedBytes);
        }
    }

    public static String getInterfaceType(NetworkIF net) {
        String name = net.getName().toLowerCase();
        String displayName = net.getDisplayName().toLowerCase();

        if (name.startsWith("eth") || name.startsWith("en") || displayName.contains("ethernet")) {
            return "Ethernet";
        } else if (name.startsWith("wlan") || name.startsWith("wl") || displayName.contains("wireless")) {
            return "Wi-Fi";
        } else if (name.startsWith("lo") || displayName.contains("loopback")) {
            return "Loopback";
        } else if (name.startsWith("ppp") || displayName.contains("point-to-point")) {
            return "PPP";
        } else if (name.startsWith("vmnet") || displayName.contains("virtual")) {
            return "Virtual";
        } else if (name.startsWith("tun") || name.startsWith("tap")) {
            return "TUN/TAP";
        } else if (name.startsWith("br") || displayName.contains("bridge")) {
            return "Bridge";
        } else if (name.startsWith("bond") || displayName.contains("bond")) {
            return "Bond";
        } else {
            return "Unknown";
        }
    }

    /**
     * 获取当前时间距离下一个“分钟为 0 或 5”的时间点还差多少毫秒
     * 例如：xx:00, xx:05, xx:10, ..., xx:55
     */
    public static long millisecondsToNext5Minute() {
        LocalDateTime now = LocalDateTime.now();

        // 当前分钟
        int minute = now.getMinute();

        // 计算下一个 5 分钟整点（向上取整）
        int nextMinute = ((minute / 5) + 1) * 5;

        LocalDateTime nextTime;
        if (nextMinute < 60) {
            // 在当前小时内
            nextTime = now.withMinute(nextMinute).withSecond(0).withNano(0);
        } else {
            // 跨小时，如 10:58 → 11:00
            nextTime = now.plusHours(1).withMinute(0).withSecond(0).withNano(0);
        }

        // 计算相差的毫秒数
        return ChronoUnit.MILLIS.between(now, nextTime);
    }

    /**
     * 获取距离下一个分钟整点的毫秒数
     */
    public static long getMillisToNextMinute() {
        LocalDateTime now = LocalDateTime.now();

        // 获取下一个分钟整点时间
        LocalDateTime nextMinute = now
                .truncatedTo(ChronoUnit.MINUTES)  // 截断到当前分钟
                .plusMinutes(1);                  // 加1分钟

        // 计算时间差（毫秒）
        return ChronoUnit.MILLIS.between(now, nextMinute);
    }

    /**
     * 获取距离下一个指定分钟整点的毫秒数
     */
    public static long getMillisToNextMinuteInterval(int intervalMinutes) {
        if (intervalMinutes <= 0) {
            throw new IllegalArgumentException("Interval must be positive");
        }

        LocalDateTime now = LocalDateTime.now();

        // 计算当前分钟在间隔中的位置
        int currentMinute = now.getMinute();
        int remainder = currentMinute % intervalMinutes;

        // 计算需要增加的分钟数
        int minutesToAdd = remainder == 0 ? intervalMinutes : intervalMinutes - remainder;

        // 获取下一个间隔整点时间
        LocalDateTime nextInterval = now
                .truncatedTo(ChronoUnit.MINUTES)  // 截断到当前分钟
                .plusMinutes(minutesToAdd)        // 增加到下一个整点
                .withSecond(0)                    // 秒设为0
                .withNano(0);                     // 纳秒设为0

        return ChronoUnit.MILLIS.between(now, nextInterval);
    }

    public static long roundMinutes(){
        LocalDateTime now = LocalDateTime.now();
        int minute = now.getMinute();
        int roundedMinute = (int) (Math.round(minute / 5.0) * 5);

        LocalDateTime roundedTime ;
        if (roundedMinute == 60) {
            roundedTime  =  now.plusHours(1).withMinute(0).withSecond(0).withNano(0);
        } else {
            roundedTime  = now.withMinute(roundedMinute).withSecond(0).withNano(0);
        }
        // 转换为10位时间戳
        long timestamp = roundedTime.atZone(ZoneId.systemDefault()).toEpochSecond();
        return timestamp;
    }

    public static LocalDateTime toLocalDateTime(long timestamp, boolean isSeconds) {
        java.time.Instant instant = isSeconds ?
                java.time.Instant.ofEpochSecond(timestamp) :
                java.time.Instant.ofEpochMilli(timestamp);

        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

    public static String getLastOid(OID oid){
        if(oid.size() > 0){
            int lastValue = oid.get(oid.size() - 1);
            return String.valueOf(lastValue);
        }
        return null;
    }

    public static LinkedHashMap<String, String> swapMap(LinkedHashMap<String, String> original) {
        LinkedHashMap<String, String> swapped = new LinkedHashMap<>();
        for (Map.Entry<String, String> entry : original.entrySet()) {
            if (entry.getValue() != null) { // 避免 null key
                swapped.put(entry.getValue(), entry.getKey());
            }
        }
        return swapped;
    }

}