from functools import lru_cache
from pathlib import Path

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=(".env", "../.env"),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    host: str = "0.0.0.0"
    port: int = 8080

    openrouter_api_key: str = ""
    openrouter_model: str = "deepseek/deepseek-chat"
    openrouter_base_url: str = "https://openrouter.ai/api/v1"

    database_url: str = "sqlite:///./data/assistant.db"
    cors_origins: str = "http://localhost:5173,http://localhost:8080,http://localhost:3000"
    system_prompt_path: str = "./prompts/assistant.md"

    @property
    def cors_origins_list(self) -> list[str]:
        return [origin.strip() for origin in self.cors_origins.split(",") if origin.strip()]

    def load_system_prompt(self) -> str:
        path = Path(self.system_prompt_path)
        if path.is_file():
            return path.read_text(encoding="utf-8")
        return "Ты домашний ИИ-ассистент. Общайся на русском."


@lru_cache
def get_settings() -> Settings:
    return Settings()