package top.lvzhiqiang.util;

import com.xxl.job.core.context.XxlJobHelper;
import org.jsoup.Jsoup;
import org.springframework.stereotype.Component;
import top.lvzhiqiang.entity.ProxyNode;
import top.lvzhiqiang.mapper.XrayProxyMapper;

import javax.annotation.Resource;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * 管理 Xray 的配置和进程
 */
@Component
public class XrayManager {
    private static final String XRAY_PATH = "/usr/program/xray/xray";
    private static final String CONFIG_PATH = "/usr/program/xray/config.json";
    private static Process xrayProcess;

    private static final int LOCAL_SOCKS_PORT = 10808;

    @Resource
    private XrayProxyMapper xrayProxyMapper;

    // 1. 生成新的 Xray 配置
    private String generateXrayConfig(ProxyNode node) {
        return XrayConfigGenerator.generateFullConfig(node, LOCAL_SOCKS_PORT);
    }

    // 2. 停止旧的 Xray 进程
    private void stopXray() {
        if (xrayProcess != null && xrayProcess.isAlive()) {
            XxlJobHelper.log("Stopping current Xray process...");
            xrayProcess.destroy();
            try {
                // 等待进程优雅关闭
                if (!xrayProcess.waitFor(5, TimeUnit.SECONDS)) {
                    xrayProcess.destroyForcibly();
                }
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                xrayProcess.destroyForcibly();
            }
        }
    }

    // 3. 启动新的 Xray 进程
    private void startXray() throws IOException {
        XxlJobHelper.log("Starting new Xray process...");
        ProcessBuilder pb = new ProcessBuilder(XRAY_PATH, "run", "-c", CONFIG_PATH);
        // 将输出重定向到文件或父进程，以便调试
        pb.redirectErrorStream(true);
        xrayProcess = pb.start();

        // 确保进程在 JVM 退出时被销毁
        Runtime.getRuntime().addShutdownHook(new Thread(this::stopXray));

        // 启动后等待几秒确保端口监听
        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
        XxlJobHelper.log("New Xray process started.");
    }

    // 4. 切换节点的主逻辑
    public void switchNode() {
        boolean flag = false;

        Proxy proxy = new Proxy(Proxy.Type.SOCKS, new InetSocketAddress("127.0.0.1", LOCAL_SOCKS_PORT));
        try {
            verifySSH("https://www.google.com", Proxy.NO_PROXY);
            String javdbTitle = verifySSH("https://www.javdb.com", proxy);
            if (!javdbTitle.contains("JavDB")) {
                flag = true;
            }
        } catch (IOException e) {
            flag = true;
        }

        if (flag) {
            List<ProxyNode> nodes = xrayProxyMapper.findProxyNodeList();
            for (ProxyNode node : nodes) {
                try {
                    // A. 生成新配置并写入文件
                    String newConfig = generateXrayConfig(node);
                    Files.write(Paths.get(CONFIG_PATH), newConfig.getBytes(StandardCharsets.UTF_8));

                    // B. 停止旧进程
                    stopXray();

                    // C. 启动新进程
                    startXray();

                    // D. 验证连接 (可选但推荐)
                    String javdbTitle = verifySSH("https://www.javdb.com", proxy);
                    if (javdbTitle.contains("JavDB")) {
                        break;
                    }
                } catch (Exception e) {
                    System.err.println("Node " + node.getId() + " failed: " + e.getMessage());
                    // 标记节点失效 db.updateNodeStatus(node.getId(), "dead");
                    // 继续循环尝试下一个节点
                }
            }
        }

    }

    // 5. 连接测试（必须用原生 Java 网络库）
    public String verifySSH(String targetUrl, Proxy proxy) throws IOException {
        // 创建 SOCKS 代理对象
        XxlJobHelper.log("Attempting to crawl via SOCKS5 proxy...");

        org.jsoup.nodes.Document doc = Jsoup.connect(targetUrl)
                .proxy(proxy)
                .timeout(10000)
                .get();

        String title = doc.title();
        XxlJobHelper.log("Crawl successful! Title: " + title);

        return title;
    }
}