"""Hub configuration via environment variables."""

from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Hub settings loaded from environment variables."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        frozen=True,
    )

    # Application
    APP_NAME: str = Field(default="LetsBe Hub", description="Application name")
    APP_VERSION: str = Field(default="0.1.0", description="Application version")
    DEBUG: bool = Field(default=False, description="Debug mode")

    # Database
    DATABASE_URL: str = Field(
        default="postgresql+asyncpg://hub:hub@db:5432/hub",
        description="PostgreSQL connection URL"
    )
    DB_POOL_SIZE: int = Field(default=5, ge=1, le=20, description="Connection pool size")
    DB_MAX_OVERFLOW: int = Field(default=10, ge=0, le=50, description="Max overflow connections")
    DB_POOL_TIMEOUT: int = Field(default=30, ge=5, le=120, description="Pool timeout in seconds")
    DB_POOL_RECYCLE: int = Field(default=1800, ge=300, le=7200, description="Connection recycle time")

    # Admin authentication
    ADMIN_API_KEY: str = Field(
        default="change-me-in-production",
        min_length=16,
        description="Admin API key for management endpoints"
    )

    # Telemetry settings
    TELEMETRY_RETENTION_DAYS: int = Field(
        default=90,
        ge=7,
        le=365,
        description="Days to retain telemetry data"
    )

    # Rate limiting for activation endpoint
    ACTIVATION_RATE_LIMIT_PER_MINUTE: int = Field(
        default=10,
        ge=1,
        le=100,
        description="Max activation attempts per instance per minute"
    )


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


settings = get_settings()