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/load.py

@@ -2,14 +2,24 @@
 
 from typing import Optional, Union
 
-from pydantic import Field
+from pydantic import Field, field_validator
 
 from akkudoktoreos.config.configabc import SettingsBaseModel
 from akkudoktoreos.core.logging import get_logger
+from akkudoktoreos.prediction.loadabc import LoadProvider
 from akkudoktoreos.prediction.loadakkudoktor import LoadAkkudoktorCommonSettings
 from akkudoktoreos.prediction.loadimport import LoadImportCommonSettings
+from akkudoktoreos.prediction.prediction import get_prediction
 
 logger = get_logger(__name__)
+prediction_eos = get_prediction()
+
+# Valid load providers
+load_providers = [
+    provider.provider_id()
+    for provider in prediction_eos.providers
+    if isinstance(provider, LoadProvider)
+]
 
 
 class LoadCommonSettings(SettingsBaseModel):
@@ -24,3 +34,11 @@ class LoadCommonSettings(SettingsBaseModel):
     provider_settings: Optional[Union[LoadAkkudoktorCommonSettings, LoadImportCommonSettings]] = (
         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 load_providers:
+            return value
+        raise ValueError(f"Provider '{value}' is not a valid load provider: {load_providers}.")