"""
Workflow Engine
工作流引擎，支持跨框架的复杂工作流编排和执行
"""

import asyncio
import uuid
from typing import Dict, Any, List, Optional
from enum import Enum
from datetime import datetime


class WorkflowStatus(Enum):
    """工作流状态"""
    PENDING = "pending"
    RUNNING = "running"
    COMPLETED = "completed"
    FAILED = "failed"
    CANCELLED = "cancelled"


class WorkflowEngine:
    """
    工作流引擎
    
    支持跨框架的复杂工作流编排和执行
    """
    
    def __init__(self):
        self.workflows: Dict[str, Dict[str, Any]] = {}
    
    def create_workflow(self, name: str, description: str = "") -> str:
        """创建工作流"""
        workflow_id = str(uuid.uuid4())
        self.workflows[workflow_id] = {
            "id": workflow_id,
            "name": name,
            "description": description,
            "status": WorkflowStatus.PENDING,
            "created_at": datetime.now(),
            "steps": [],
            "results": []
        }
        return workflow_id
    
    def add_step(self, workflow_id: str, step_config: Dict[str, Any]) -> bool:
        """添加工作流步骤"""
        if workflow_id in self.workflows:
            step_id = str(uuid.uuid4())
            step = {
                "id": step_id,
                "config": step_config,
                "status": "pending",
                "created_at": datetime.now()
            }
            self.workflows[workflow_id]["steps"].append(step)
            return True
        return False
    
    async def execute_workflow(self, workflow_id: str) -> Dict[str, Any]:
        """执行工作流"""
        if workflow_id not in self.workflows:
            return {"error": "Workflow not found"}
        
        workflow = self.workflows[workflow_id]
        workflow["status"] = WorkflowStatus.RUNNING
        workflow["started_at"] = datetime.now()
        
        try:
            # 简单的顺序执行逻辑
            for step in workflow["steps"]:
                step["status"] = "running"
                # 这里应该调用实际的步骤执行逻辑
                await asyncio.sleep(0.1)  # 模拟执行
                step["status"] = "completed"
                step["completed_at"] = datetime.now()
            
            workflow["status"] = WorkflowStatus.COMPLETED
            workflow["completed_at"] = datetime.now()
            
            return {"status": "success", "workflow_id": workflow_id}
            
        except Exception as e:
            workflow["status"] = WorkflowStatus.FAILED
            workflow["error"] = str(e)
            return {"status": "failed", "error": str(e)}
    
    def get_workflow(self, workflow_id: str) -> Optional[Dict[str, Any]]:
        """获取工作流信息"""
        return self.workflows.get(workflow_id)
