"""
تسک‌های Celery برای واکشی داده‌های خاک.
"""

from decimal import Decimal

from config.celery import app
from django.apps import apps
from django.db import transaction

from .models import SoilDepthData, SoilLocation
from .soil_adapters import DEPTHS

try:
    import requests
except ImportError:  # pragma: no cover - handled in stripped envs
    RequestException = Exception
else:
    RequestException = requests.RequestException


def fetch_soil_data_for_coordinates(
    latitude: float,
    longitude: float,
    task_id: str = "",
    progress_callback=None,
):
    """
    واکشی سنکرون داده خاک برای مختصات داده‌شده و ذخیره در DB.
    این helper هم توسط Celery task و هم توسط endpointهای sync استفاده می‌شود.
    """
    lat = Decimal(str(round(float(latitude), 6)))
    lon = Decimal(str(round(float(longitude), 6)))
    adapter = apps.get_app_config("location_data").get_soil_data_adapter()

    with transaction.atomic():
        location, created = SoilLocation.objects.select_for_update().get_or_create(
            latitude=lat,
            longitude=lon,
            defaults={"task_id": task_id},
        )
        if not created and task_id:
            location.task_id = task_id
            location.save(update_fields=["task_id"])

    for index, depth in enumerate(DEPTHS):
        if progress_callback is not None:
            progress_callback(
                state="PROGRESS",
                meta={
                    "current": index + 1,
                    "total": len(DEPTHS),
                    "message": f"در حال واکشی عمق {depth}...",
                },
            )
        fields = adapter.fetch_depth_fields(float(lon), float(lat), depth)
        with transaction.atomic():
            SoilDepthData.objects.update_or_create(
                soil_location=location,
                depth_label=depth,
                defaults=fields,
            )

    if task_id:
        with transaction.atomic():
            location.task_id = ""
            location.save(update_fields=["task_id"])

    return {
        "status": "completed",
        "location_id": location.id,
        "depths": DEPTHS,
    }


@app.task(bind=True)
def fetch_soil_data_task(self, latitude: float, longitude: float):
    """
    واکشی داده‌های خاک برای مختصات داده‌شده و ذخیره در DB.
    برای هر عمق (0-5cm, 5-15cm, 15-30cm) یک ریکوئست/شبیه‌سازی جدا انجام می‌شود.
    """
    try:
        return fetch_soil_data_for_coordinates(
            latitude=latitude,
            longitude=longitude,
            task_id=self.request.id,
            progress_callback=self.update_state,
        )
    except RequestException as exc:
        lat = Decimal(str(round(float(latitude), 6)))
        lon = Decimal(str(round(float(longitude), 6)))
        location = SoilLocation.objects.filter(latitude=lat, longitude=lon).first()
        return {
            "status": "error",
            "location_id": getattr(location, "id", None),
            "error": str(exc),
        }