"""Task management endpoints."""
from typing import Optional

from fastapi import APIRouter, HTTPException, BackgroundTasks
from pydantic import BaseModel, Field

from ...agents.orchestrator import run_workflow, stream_workflow
from ...state.graph_state import create_initial_state

router = APIRouter()


class TaskRequest(BaseModel):
    """Task request model."""

    task: str = Field(..., description="Task description")
    task_id: Optional[str] = Field(None, description="Optional custom task ID")


class TaskResponse(BaseModel):
    """Task response model."""

    task_id: str
    task: str
    status: str


@router.post("/", response_model=TaskResponse)
async def create_task(request: TaskRequest, background_tasks: BackgroundTasks):
    """
    Create and execute a new task.

    Args:
        request: Task request payload
        background_tasks: Background task runner

    Returns:
        TaskResponse: Created task information
    """
    try:
        state = create_initial_state(request.task, task_id=request.task_id)
        task_id = state["task_id"]

        # Run workflow in background
        background_tasks.add_task(run_workflow, state)

        return {"task_id": task_id, "task": request.task, "status": "processing"}
    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e)) from e


@router.get("/{task_id}", response_model=TaskResponse)
async def get_task(task_id: str):
    """
    Get task status.

    Args:
        task_id: Task ID

    Returns:
        TaskResponse: Task information

    Raises:
        HTTPException: If task not found
    """
    # This would fetch from persistent storage (Redis/DB)
    # Placeholder implementation
    return {"task_id": task_id, "task": "Example task", "status": "completed"}


@router.delete("/{task_id}")
async def cancel_task(task_id: str):
    """
    Cancel a running task.

    Args:
        task_id: Task ID to cancel

    Returns:
        dict: Cancellation confirmation
    """
    return {"task_id": task_id, "status": "cancelled"}