import os
from pydantic_settings import BaseSettings
from typing import List

# Docker-first: load secrets from mounted files when env vars are absent
_PG_SECRET_FILE = os.getenv("POSTGRES_PASSWORD_FILE", "/run/secrets/postgres-password")
if not os.getenv("POSTGRES_PASSWORD"):
    try:
        with open(_PG_SECRET_FILE, 'r') as f:
            os.environ["POSTGRES_PASSWORD"] = f.read().strip()
    except Exception:
        # Leave as-is; connection will fail loudly if missing
        pass

class Settings(BaseSettings):
    """Application configuration"""
    
    # Database settings
    POSTGRES_HOST: str = os.getenv("POSTGRES_HOST", "mvp-platform-vehicles-db")
    POSTGRES_PORT: int = int(os.getenv("POSTGRES_PORT", "5432"))
    POSTGRES_USER: str = os.getenv("POSTGRES_USER", "mvp_platform_user") 
    POSTGRES_PASSWORD: str = os.getenv("POSTGRES_PASSWORD", "")
    POSTGRES_DATABASE: str = os.getenv("POSTGRES_DATABASE", "vehicles")
    
    # Redis settings
    REDIS_HOST: str = os.getenv("REDIS_HOST", "mvp-platform-vehicles-redis")
    REDIS_PORT: int = int(os.getenv("REDIS_PORT", "6379"))
    REDIS_DB: int = int(os.getenv("REDIS_DB", "0"))
    
    # Database connection pool settings
    DATABASE_MIN_CONNECTIONS: int = int(os.getenv("DATABASE_MIN_CONNECTIONS", "5"))
    DATABASE_MAX_CONNECTIONS: int = int(os.getenv("DATABASE_MAX_CONNECTIONS", "20"))
    
    # Cache settings
    CACHE_TTL: int = int(os.getenv("CACHE_TTL", "3600"))  # 1 hour default
    
    # Security
    API_KEY: str = os.getenv("API_KEY", "mvp-platform-vehicles-secret-key")
    
    # Application settings
    DEBUG: bool = os.getenv("DEBUG", "false").lower() == "true"
    CORS_ORIGINS: List[str] = [
        "http://localhost:3000", 
        "https://motovaultpro.com", 
        "http://localhost:3001"
    ]
    
    class Config:
        case_sensitive = True

def get_settings() -> Settings:
    """Get application settings"""
    return Settings()