import os
from pathlib import Path
from pydantic import field_validator
from pydantic_settings import BaseSettings

# Project directories
ROOT_DIR = Path(__file__).parent.parent.parent.resolve()


class Settings(BaseSettings):
    # Project info
    PROJECT_NAME: str = "One-Time Secret Sharing Service"
    API_V1_STR: str = "/api/v1"
    
    # Database
    DB_DIR: Path = Path("/app") / "storage" / "db"
    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
    
    # Secret settings
    DEFAULT_SECRET_TTL_HOURS: int = 24
    MAX_SECRET_TTL_HOURS: int = 168  # 7 days
    
    # Security
    SECRET_KEY: str = os.environ.get("SECRET_KEY", "development_secret_key")
    
    @field_validator("DB_DIR")
    def create_db_dir(cls, db_dir: Path) -> Path:
        db_dir.mkdir(parents=True, exist_ok=True)
        return db_dir

    class Config:
        env_file = ".env"
        case_sensitive = True


# Create global settings instance
settings = Settings()