"""Runtime settings service.

Resolution order per key: database value → environment variable → schema
default. Writing a value persists it to the database, so changes take effect
immediately without a restart.
"""
import os

from apps.core.models import SystemSetting
from apps.core.settings_registry import SCHEMA_BY_KEY, SETTINGS_SCHEMA


class SettingsService:
    def schema(self):
        return SETTINGS_SCHEMA

    def _env_key(self, key: str) -> str:
        return key.upper().replace(".", "_")

    def get(self, key: str, default=None):
        setting = SystemSetting.objects.filter(key=key).first()
        if setting is not None:
            return setting.value

        env_value = os.environ.get(self._env_key(key))
        if env_value is not None:
            return env_value

        entry = SCHEMA_BY_KEY.get(key)
        if entry and "default" in entry:
            return entry["default"]
        return default

    def get_bool(self, key: str, default=False) -> bool:
        value = self.get(key, default)
        if isinstance(value, bool):
            return value
        return str(value).lower() in {"1", "true", "yes", "on"}

    def set(self, key: str, value) -> None:
        SystemSetting.objects.update_or_create(key=key, defaults={"value": value})

    def all_values(self, mask_secrets: bool = True) -> dict:
        result = {}
        for entry in SETTINGS_SCHEMA:
            value = self.get(entry["key"])
            if mask_secrets and entry.get("type") == "secret" and value:
                result[entry["key"]] = "••••••"
            else:
                result[entry["key"]] = value
        return result