"""Configuration for GitHub client."""

import os

from pydantic import model_validator
from pydantic_settings import BaseSettings


class GitHubConfig(BaseSettings):
    """Configuration for GitHub client.

    Locally, set GITHUB_TOKEN to the token value directly.
    In AWS Lambda, set GITHUB_TOKEN to the Secrets Manager secret name;
    the token will be fetched from Secrets Manager at runtime.
    """

    github_token: str

    @model_validator(mode='after')
    def _resolve_secrets(self) -> 'GitHubConfig':
        """Fetch token from Secrets Manager when running in Lambda."""
        if os.environ.get('AWS_LAMBDA_FUNCTION_NAME'):
            from github_client.secrets_manager import SecretsManagerClient

            if not self.github_token:
                raise ValueError('GITHUB_TOKEN must be set')

            self.github_token = SecretsManagerClient().get_github_token(
                self.github_token
            )

        if not self.github_token:
            raise ValueError('GITHUB_TOKEN must be set')

        return self