"""Harbor environment configuration."""

from __future__ import annotations

from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Runtime configuration loaded from environment variables."""

    tasks_data_dir: str = "data/tasks"
    openrouter_api_key: str = ""
    claim_extractor_model: str = "anthropic/claude-haiku-4.5"
    claim_extractor_base_url: str = "https://openrouter.ai/api/v1"

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


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    """Return cached settings instance."""
    return Settings()