from functools import lru_cache
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    # URLs
    LOCAL_URL: str = "http://localhost"
    PUBLIC_URL: str = ""

    # Auth / JWT
    JWT_SECRET_KEY: str = "change-me-in-production"
    JWT_EXPIRE_MINUTES: int = 60 * 24 * 7  # 7 days

    # Database
    DATABASE_URL: str = "postgresql+asyncpg://congress:congress@postgres:5432/pocketveto"
    SYNC_DATABASE_URL: str = "postgresql://congress:congress@postgres:5432/pocketveto"

    # Redis
    REDIS_URL: str = "redis://redis:6379/0"

    # api.data.gov (shared key for Congress.gov and GovInfo)
    DATA_GOV_API_KEY: str = ""
    CONGRESS_POLL_INTERVAL_MINUTES: int = 30

    # LLM
    LLM_PROVIDER: str = "openai"  # openai | anthropic | gemini | ollama

    OPENAI_API_KEY: str = ""
    OPENAI_MODEL: str = "gpt-4o-mini"      # gpt-4o-mini: excellent JSON quality at ~10x lower cost than gpt-4o

    ANTHROPIC_API_KEY: str = ""
    ANTHROPIC_MODEL: str = "claude-sonnet-4-6"  # Sonnet matches Opus for structured tasks at ~5x lower cost

    GEMINI_API_KEY: str = ""
    GEMINI_MODEL: str = "gemini-2.0-flash"

    OLLAMA_BASE_URL: str = "http://host.docker.internal:11434"
    OLLAMA_MODEL: str = "llama3.1"

    # Max LLM requests per minute — Celery enforces this globally across all workers.
    # Safe defaults: free Gemini=15 RPM, Anthropic paid=50 RPM, OpenAI paid=500 RPM.
    # Raise this in .env once you confirm your API tier.
    LLM_RATE_LIMIT_RPM: int = 10

    # Google Civic Information API (zip → representative lookup)
    # Free key: https://console.cloud.google.com/apis/library/civicinfo.googleapis.com
    CIVIC_API_KEY: str = ""

    # News
    NEWSAPI_KEY: str = ""

    # pytrends
    PYTRENDS_ENABLED: bool = True

    # SMTP (Email notifications)
    SMTP_HOST: str = ""
    SMTP_PORT: int = 587
    SMTP_USER: str = ""
    SMTP_PASSWORD: str = ""
    SMTP_FROM: str = ""       # Defaults to SMTP_USER if blank
    SMTP_STARTTLS: bool = True


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


settings = get_settings()