from __future__ import annotations

from typing import Any, Dict, Optional

from app.schemas.tasks import TaskStatusResponse
from app.services.supabase_rest import supabase_rest


class SupabaseTaskTracker:
    """利用 Supabase background_tasks 表追踪进度。"""

    def create_task(self, *, user_id: str, document_id: str, task_type: str = "ocr") -> TaskStatusResponse:
        payload = {
            "user_id": user_id,
            "document_id": document_id,
            "task_type": task_type,
            "status": "pending",
            "progress": 0,
        }
        record = supabase_rest.insert("background_tasks", payload)
        return self._to_response(record)

    def get_task(self, *, task_id: str, user_id: str) -> Optional[TaskStatusResponse]:
        record = supabase_rest.select_one("background_tasks", {"id": task_id, "user_id": user_id})
        if not record:
            return None
        return self._to_response(record)

    def update_task(self, *, task_id: str, **kwargs: Any) -> None:
        supabase_rest.update("background_tasks", {"id": task_id}, kwargs)

    def _to_response(self, record: Optional[Dict[str, Any]]) -> TaskStatusResponse:
        if not record:
            raise ValueError("Task record missing")
        return TaskStatusResponse(
            task_id=str(record["id"]),
            status=record.get("status", "pending"),
            progress=record.get("progress", 0),
            message=record.get("message"),
        )


task_tracker = SupabaseTaskTracker()