package com.soa.orchestration;

import com.soa.bus.ServiceBus;
import com.soa.monitoring.ServiceMonitor;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.ArrayList;
import java.util.List;

/**
 * 服务编排器 - 负责组合多个服务来完成复杂的业务流程
 */
public class ServiceOrchestrator {
    private static final Logger logger = LogManager.getLogger(ServiceOrchestrator.class);
    private final ServiceBus serviceBus;
    private final ServiceMonitor monitor;
    
    public ServiceOrchestrator() {
        this.serviceBus = ServiceBus.getInstance();
        this.monitor = ServiceMonitor.getInstance();
    }
    
    /**
     * 执行订单处理流程
     * 1. 检查用户
     * 2. 创建订单
     * 3. 处理支付
     */
    public String processOrder(String userId, String orderInfo, String paymentDetails) {
        logger.info("Starting order processing flow for user: {}", userId);
        
        List<ProcessStep> steps = new ArrayList<>();
        steps.add(new ProcessStep("userService", "checkUser:" + userId));
        steps.add(new ProcessStep("orderService", "createOrder:" + orderInfo));
        steps.add(new ProcessStep("paymentService", "processPayment:" + paymentDetails));
        
        StringBuilder result = new StringBuilder();
        boolean allSuccessful = true;
        
        for (ProcessStep step : steps) {
            try {
                long startTime = monitor.startMonitoring(step.serviceName);
                String stepResult = serviceBus.callService(step.serviceName, step.request);
                
                // 检查执行结果是否成功
                boolean success = !stepResult.contains("Error");
                monitor.endMonitoring(step.serviceName, startTime, success);
                
                result.append(step.serviceName).append(": ").append(stepResult).append("\n");
                
                if (!success) {
                    allSuccessful = false;
                    logger.error("Step failed: {}", step.serviceName);
                    break; // 失败时中断流程
                }
                
            } catch (Exception e) {
                monitor.endMonitoring(step.serviceName, System.currentTimeMillis(), false);
                result.append(step.serviceName).append(": Error - ").append(e.getMessage()).append("\n");
                allSuccessful = false;
                logger.error("Exception in step {}: {}", step.serviceName, e.getMessage());
                break;
            }
        }
        
        if (allSuccessful) {
            result.append("Order processing completed successfully");
        } else {
            result.append("Order processing failed");
        }
        
        return result.toString();
    }
    
    /**
     * 创建自定义流程
     */
    public String executeCustomFlow(List<ProcessStep> steps) {
        StringBuilder result = new StringBuilder();
        
        for (ProcessStep step : steps) {
            String stepResult = serviceBus.callService(step.serviceName, step.request);
            result.append(step.serviceName).append(": ").append(stepResult).append("\n");
        }
        
        return result.toString();
    }
    
    /**
     * 流程步骤内部类
     */
    public static class ProcessStep {
        public final String serviceName;
        public final String request;
        
        public ProcessStep(String serviceName, String request) {
            this.serviceName = serviceName;
            this.request = request;
        }
    }
}