from dataclasses import dataclass, field
from datetime import datetime
from enum import Enum
from typing import List, Optional, Dict, Any
from luxx.agent.agent import agent_service
from luxx.utils.helpers import generate_id


class TaskStatus(Enum):
    """Task status enum"""
    PENDING = "pending"      
    READY = "ready"          
    RUNNING = "running"      
    BLOCK = "block"          
    TERMINATED = "terminated"


class StepStatus(Enum):
    """Step status enum"""
    PENDING = "pending"
    RUNNING = "running"
    COMPLETED = "completed"
    FAILED = "failed"
    SKIPPED = "skipped"


@dataclass
class Step:
    """Task step"""
    id: str
    name: str
    description: str = ""
    status: StepStatus = StepStatus.PENDING
    result: Optional[Dict[str, Any]] = None
    created_at: datetime = field(default_factory=datetime.now)
    updated_at: datetime = field(default_factory=datetime.now)

    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary"""
        return {
            "id": self.id,
            "name": self.name,
            "description": self.description,
            "status": self.status.value,
            "result": self.result,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None
        }


@dataclass
class Task:
    """Task entity"""
    id: str
    name: str
    description: str = ""
    goal: str = ""
    status: TaskStatus = TaskStatus.PENDING
    steps: List[Step] = field(default_factory=list)
    subtasks: List["Task"] = field(default_factory=list)
    result: Optional[Dict[str, Any]] = None
    created_at: datetime = field(default_factory=datetime.now)
    updated_at: datetime = field(default_factory=datetime.now)
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary"""
        return {
            "id": self.id,
            "name": self.name,
            "description": self.description,
            "goal": self.goal,
            "status": self.status.value,
            "steps": [s.to_dict() for s in self.steps],
            "result": self.result,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None
        }


class TaskService:
    """Task service for managing tasks"""
    
    def __init__(self):
        self._tasks: Dict[str, Task] = {}
    
    def create_task(
        self,
        agent_id: str,
        name: str,
        goal: str,
        description: str = "",
        steps: List[Dict[str, Any]] = None
    ) -> Optional[Task]:
        """Create task for agent, optionally as subtask"""
        agent = agent_service.get_agent(agent_id)
        if not agent:
            return None
        
        task_id = generate_id("task")
        task = Task(
            id=task_id,
            name=name,
            description=description,
            goal=goal
        )
        
        # Add steps
        if steps:
            for step_data in steps:
                step = Step(
                    id=generate_id("step"),
                    name=step_data.get("name", ""),
                    description=step_data.get("description", "")
                )
                task.steps.append(step)
        
        agent.current_task = task
        
        self._tasks[task_id] = task
        
        self._logger.info(f"Created task: {task_id} for agent: {agent_id}")
        return task
    
    def get_task(self, task_id: str) -> Optional[Task]:
        """Get task by ID"""
        return self._tasks.get(task_id)
    
    def list_tasks(self, agent_id: str = None) -> List[Task]:
        """List tasks, optionally filtered by agent"""
        if agent_id:
            agent = self._agent_service.get_agent(agent_id)
            if agent and agent.current_task:
                return [agent.current_task]
            return []
        return list(self._tasks.values())
    
    def update_task_status(
        self,
        task_id: str,
        status: TaskStatus,
        result: Any = None
    ) -> Optional[Task]:
        """Update task status"""
        task = self._tasks.get(task_id)
        if not task:
            return None
        
        task.status = status
        task.result = result
        task.updated_at = datetime.now()
        return task
    
    def add_steps(
        self,
        task_id: str,
        steps: List[Dict[str, Any]]
    ) -> Optional[List[Step]]:
        """Add steps to task"""
        task = self._tasks.get(task_id)
        if not task:
            return None
        
        result = []
        for step_data in steps:
            step = Step(
                id=generate_id("step"),
                name=step_data.get("name", ""),
                description=step_data.get("description", "")
            )
            task.steps.append(step)
            result.append(step)
        
        task.updated_at = datetime.now()
        return result
    
    def delete_task(self, task_id: str) -> bool:
        """Delete task"""
        if task_id not in self._tasks:
            return False
        
        del self._tasks[task_id]
        return True


task_service = TaskService()