from dataclasses import dataclass

from sqlalchemy.orm import Session

from app.models.mobile_settings import MOBILE_SETTINGS_ROW_ID, MobileSettings


@dataclass(frozen=True)
class MobileSettingsConfig:
    devices_allowed: bool
    max_devices_per_user: int
    min_app_version: str | None
    source: str = "db"


def get_effective_mobile_settings(db: Session) -> MobileSettingsConfig:
    row = db.get(MobileSettings, MOBILE_SETTINGS_ROW_ID)
    if row is None:
        return MobileSettingsConfig(
            devices_allowed=False,
            max_devices_per_user=3,
            min_app_version=None,
            source="default",
        )
    return MobileSettingsConfig(
        devices_allowed=bool(row.devices_allowed),
        max_devices_per_user=max(1, int(row.max_devices_per_user or 3)),
        min_app_version=(row.min_app_version or "").strip() or None,
        source="db",
    )


def upsert_mobile_settings(
    db: Session,
    *,
    devices_allowed: bool,
    max_devices_per_user: int,
    min_app_version: str | None,
) -> MobileSettingsConfig:
    if max_devices_per_user < 1 or max_devices_per_user > 50:
        raise ValueError("max_devices_per_user must be between 1 and 50")
    cleaned_version = (min_app_version or "").strip() or None
    row = db.get(MobileSettings, MOBILE_SETTINGS_ROW_ID)
    if row is None:
        row = MobileSettings(
            id=MOBILE_SETTINGS_ROW_ID,
            devices_allowed=devices_allowed,
            max_devices_per_user=max_devices_per_user,
            min_app_version=cleaned_version,
        )
        db.add(row)
    else:
        row.devices_allowed = devices_allowed
        row.max_devices_per_user = max_devices_per_user
        row.min_app_version = cleaned_version
    db.commit()
    db.refresh(row)
    return get_effective_mobile_settings(db)