EOSdash: Enable EOS configuration by EOSdash. (#477)

Improve config page to edit actual configuration used by EOS.
Add admin page to save the actual configuration to the configuration file.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

src/akkudoktoreos/prediction/weather.py

@@ -2,11 +2,22 @@
 
 from typing import Optional
 
-from pydantic import Field
+from pydantic import Field, field_validator
 
 from akkudoktoreos.config.configabc import SettingsBaseModel
+from akkudoktoreos.prediction.prediction import get_prediction
+from akkudoktoreos.prediction.weatherabc import WeatherProvider
 from akkudoktoreos.prediction.weatherimport import WeatherImportCommonSettings
 
+prediction_eos = get_prediction()
+
+# Valid weather providers
+weather_providers = [
+    provider.provider_id()
+    for provider in prediction_eos.providers
+    if isinstance(provider, WeatherProvider)
+]
+
 
 class WeatherCommonSettings(SettingsBaseModel):
     """Weather Forecast Configuration."""
@@ -20,3 +31,13 @@ class WeatherCommonSettings(SettingsBaseModel):
     provider_settings: Optional[WeatherImportCommonSettings] = Field(
         default=None, description="Provider settings", examples=[None]
     )
+
+    # Validators
+    @field_validator("provider", mode="after")
+    @classmethod
+    def validate_provider(cls, value: Optional[str]) -> Optional[str]:
+        if value is None or value in weather_providers:
+            return value
+        raise ValueError(
+            f"Provider '{value}' is not a valid weather provider: {weather_providers}."
+        )