"""Application settings loaded from environment."""

from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Runtime configuration for ReplyFlow."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

    app_name: str = "ReplyFlow"
    app_env: str = "production"
    secret_key: str = "change-me"
    public_base_url: str = "http://localhost:7860"

    database_url: str = (
        "sqlite+aiosqlite:///./data/db/replyflow.db"
    )
    chroma_path: str = "./data/chroma"
    knowledge_path: str = "./data/knowledge"
    # Always use JSON fallback on Spaces (no Chroma).
    use_json_store: bool = True
    # Seed with local embeddings so startup never waits on OpenAI.
    seed_local_embeddings: bool = True

    openai_api_key: str = ""
    openai_model: str = "gpt-4o-mini"
    openai_embedding_model: str = "text-embedding-3-small"

    calcom_api_key: str = ""
    calcom_event_type_id: str = ""
    calcom_username: str = ""

    whatsapp_token: str = ""
    whatsapp_phone_number_id: str = ""
    whatsapp_verify_token: str = "replyflow-verify"
    whatsapp_app_secret: str = ""

    handoff_webhook_url: str = ""

    demo_business_name: str = "Nordic Paper Solutions"
    demo_timezone: str = "Europe/Paris"

    @property
    def has_openai(self) -> bool:
        """True when an OpenAI API key is configured."""
        return bool(self.openai_api_key.strip())

    @property
    def has_calcom(self) -> bool:
        """True when Cal.com credentials are configured."""
        return bool(
            self.calcom_api_key.strip()
            and self.calcom_event_type_id.strip()
        )

    @property
    def has_whatsapp(self) -> bool:
        """True when WhatsApp credentials are configured."""
        return bool(
            self.whatsapp_token.strip()
            and self.whatsapp_phone_number_id.strip()
        )


@lru_cache
def get_settings() -> Settings:
    """Return cached settings instance."""
    return Settings()