import os
from pathlib import Path
from pydantic_settings import BaseSettings

BASE_DIR = Path(__file__).resolve().parent.parent.parent

class Settings(BaseSettings):
    PROJECT_NAME: str = "OnEver Drive"
    VERSION: str = "1.0.0"
    API_V1_PREFIX: str = "/api"
    
    # Environment
    ENVIRONMENT: str = "development"
    DEBUG: bool = True
    
    # Database: Default to SQLite for seamless local dev & test, configurable to PostgreSQL in production
    DATABASE_URL: str = f"sqlite+aiosqlite:///{BASE_DIR}/onever_drive.db"
    
    # Storage settings
    STORAGE_ROOT: str = str(BASE_DIR / "storage" / "backups")
    STORAGE_TEMP_ROOT: str = str(BASE_DIR / "storage" / "temp")
    
    # Security
    SECRET_KEY: str = "onever-drive-super-secret-key-change-in-production-2026"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7  # 7 days
    
    # Upload & Transfer settings
    DEFAULT_CHUNK_SIZE: int = 4 * 1024 * 1024  # 4 MB
    MAX_CHUNK_SIZE: int = 16 * 1024 * 1024     # 16 MB
    MIN_STABLE_TIME_SECONDS: int = 60          # 60s stability window for locked files
    
    # Retention Defaults
    DEFAULT_RETENTION_DAILY: int = 7
    DEFAULT_RETENTION_WEEKLY: int = 4
    DEFAULT_RETENTION_MONTHLY: int = 12

    model_config = {"env_file": ".env", "extra": "allow"}

settings = Settings()

# Ensure storage directories exist
os.makedirs(settings.STORAGE_ROOT, exist_ok=True)
os.makedirs(settings.STORAGE_TEMP_ROOT, exist_ok=True)