package com.qqchen.deploy.backend.deploy.handler;

import com.qqchen.deploy.backend.framework.enums.SSHEvent;
import com.qqchen.deploy.backend.framework.enums.SSHTargetType;
import com.qqchen.deploy.backend.framework.ssh.SSHCommandServiceFactory;
import com.qqchen.deploy.backend.framework.ssh.websocket.AbstractSSHWebSocketHandler;
import com.qqchen.deploy.backend.framework.ssh.websocket.SSHEventData;
import com.qqchen.deploy.backend.framework.ssh.websocket.SSHSessionManager;
import com.qqchen.deploy.backend.framework.ssh.websocket.SSHTarget;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.WebSocketSession;

import java.util.Map;

/**
 * K8S Pod SSH WebSocket处理器（业务层）
 * 继承Framework的抽象Handler，只需实现5个方法
 * 
 * 示例实现：展示如何为K8S Pod提供SSH终端能力
 */
@Slf4j
@Component
public class PodSSHWebSocketHandler extends AbstractSSHWebSocketHandler {
    
    // TODO: 注入K8S相关的Service
    // @Resource
    // private IK8sPodService podService;
    
    // @Resource
    // private IK8sAuditLogService k8sAuditLogService;
    
    private static final int MAX_SESSIONS_PER_POD = 3;
    
    /**
     * 构造函数（注入Framework依赖）
     */
    public PodSSHWebSocketHandler(
        SSHCommandServiceFactory sshCommandServiceFactory,
        SSHSessionManager sessionManager) {
        super(sshCommandServiceFactory, sessionManager);
    }

    // ========== 实现Framework要求的5个抽象方法 ==========
    
    /**
     * 1. 获取SSH连接目标（业务逻辑）
     */
    @Override
    protected SSHTarget getSSHTarget(WebSocketSession session) throws Exception {
        // 从URL提取podId
        Long podId = extractPodId(session);
        if (podId == null) {
            throw new IllegalArgumentException("无效的Pod ID");
        }
        
        // TODO: 从数据库获取Pod信息
        // K8sPod pod = podService.findById(podId);
        // if (pod == null) {
        //     throw new IllegalArgumentException("Pod不存在: " + podId);
        // }
        
        // 构建SSH目标（示例）
        SSHTarget target = new SSHTarget();
        target.setTargetType(SSHTargetType.POD);
        
        // TODO: 从K8S API获取Pod的SSH信息
        // 注意：K8S Pod可能需要通过Node的SSH + kubectl exec
        // target.setHost(pod.getNodeIp());
        // target.setPort(pod.getSshPort());
        // target.setUsername(pod.getUsername());
        // target.setAuthType(pod.getAuthType());
        // target.setPassword(pod.getPassword());
        // target.setOsType(pod.getOsType());
        
        // 示例配置
        target.setHost("k8s-node-ip");
        target.setPort(22);
        target.setUsername("k8s-user");
        target.setMetadata(podId);  // 保存podId供后续使用
        
        return target;
    }

    /**
     * 2. 权限验证（业务逻辑）
     */
    @Override
    protected boolean checkPermission(Long userId, SSHTarget target) {
        // TODO: 实现K8S RBAC权限验证
        // Long podId = (Long) target.getMetadata();
        // return k8sRbacService.hasPermission(userId, "pod", "exec", podId);
        
        log.warn("K8S Pod权限验证尚未实现，默认允许所有用户访问");
        return true;
    }

    /**
     * 3. 获取最大并发连接数
     */
    @Override
    protected int getMaxSessions() {
        return MAX_SESSIONS_PER_POD;
    }

    /**
     * 4. 获取WebSocket路径模式
     */
    @Override
    protected String getPathPattern() {
        return "/api/v1/k8s-pod-ssh/connect/*";
    }

    /**
     * 5. 事件钩子（审计日志等业务逻辑）
     */
    @Override
    protected void onEvent(SSHEvent event, SSHEventData eventData) {
        String sessionId = eventData.getSessionId();
        SSHTarget target = eventData.getTarget();
        
        if (target == null) {
            log.warn("事件处理失败，target为null: event={}, sessionId={}", event, sessionId);
            return;
        }
        Long podId = (Long) target.getMetadata();
        
        switch (event) {
            case AFTER_CONNECT:
                // 创建K8S审计日志
                try {
                    Long userId = eventData.getUserId();
                    String clientIp = eventData.getClientIp();
                    String userAgent = eventData.getUserAgent();
                    
                    // TODO: 调用K8S审计服务
                    // Long auditLogId = k8sAuditLogService.createAuditLog(
                    //     userId, podId, sessionId, clientIp, userAgent);
                    
                    log.info("K8S Pod连接审计日志已创建: sessionId={}, podId={}", sessionId, podId);
                } catch (Exception e) {
                    log.error("创建K8S审计日志失败: sessionId={}", sessionId, e);
                }
                break;
                
            case AFTER_DISCONNECT:
                // 关闭K8S审计日志
                try {
                    // TODO: k8sAuditLogService.closeAuditLog(sessionId, "SUCCESS", "正常断开");
                    log.info("K8S Pod审计日志已关闭: sessionId={}", sessionId);
                } catch (Exception e) {
                    log.error("关闭K8S审计日志失败: sessionId={}", sessionId, e);
                }
                break;
                
            case ON_COMMAND:
                // 记录命令到K8S审计日志
                try {
                    String command = eventData.getCommand();
                    if (command != null && command.length() > 0) {
                        // TODO: k8sAuditLogService.recordCommand(sessionId, command);
                    }
                } catch (Exception e) {
                    log.error("记录K8S命令失败: sessionId={}", sessionId, e);
                }
                break;
                
            case ON_ERROR:
                // 记录错误
                try {
                    String error = eventData.getErrorMessage();
                    // TODO: k8sAuditLogService.closeAuditLog(sessionId, "FAILED", error);
                    log.error("K8S Pod连接错误: sessionId={}, error={}", sessionId, error);
                } catch (Exception e) {
                    log.error("记录K8S错误失败: sessionId={}", sessionId, e);
                }
                break;
                
            case BEFORE_SHUTDOWN:
                // 优雅下线前处理审计日志
                try {
                    String reason = eventData.getDisconnectReason();
                    // TODO: k8sAuditLogService.closeAuditLog(sessionId, "SERVER_SHUTDOWN", reason);
                    log.info("K8S审计日志已更新(优雅下线): sessionId={}", sessionId);
                } catch (Exception e) {
                    log.error("更新K8S审计日志失败(优雅下线): sessionId={}", sessionId, e);
                }
                break;
        }
    }

    // ========== 辅助方法 ==========
    
    /**
     * 从WebSocket session URL中提取podId
     */
    private Long extractPodId(WebSocketSession session) {
        try {
            String path = session.getUri().getPath();
            // /api/v1/k8s-pod-ssh/connect/{podId}
            String[] parts = path.split("/");
            if (parts.length > 0) {
                return Long.parseLong(parts[parts.length - 1]);
            }
        } catch (Exception e) {
            log.error("提取podId失败", e);
        }
        return null;
    }
    
    /**
     * 可选：重写createConnection方法以支持kubectl exec
     * K8S Pod可能不是标准SSH连接，而是通过kubectl exec
     */
    // @Override
    // protected SSHClient createConnection(SSHTarget target) throws Exception {
    //     // 使用K8S API创建exec连接
    //     // 而不是标准SSH连接
    //     return k8sExecService.createExecConnection(target);
    // }
}
