import os
from pathlib import Path
from typing import Optional

from pydantic import BaseModel

# Try to use pydantic_settings if available, otherwise fallback to a simple BaseModel
try:
    from pydantic_settings import BaseSettings
except ImportError:
    # Fallback for environments without pydantic_settings
    # In Pydantic v2, BaseSettings was moved to pydantic_settings package
    class BaseSettings(BaseModel):
        """
        Simplified BaseSettings implementation for compatibility.
        """
        class Config:
            env_file = ".env"
            case_sensitive = True
            extra = "ignore"  # Allow extra fields from environment variables

        def __init__(self, **kwargs):
            # Load environment variables
            env_values = {}
            for field_name, _ in self.__annotations__.items():
                env_val = os.environ.get(field_name)
                if env_val is not None:
                    env_values[field_name] = env_val
            
            # Override with any provided values
            env_values.update(kwargs)
            super().__init__(**env_values)


class Settings(BaseSettings):
    PROJECT_NAME: str = "Todo API"
    API_V1_STR: str = "/api/v1"
    
    # Database settings
    DB_DIR: Path = Path("/app") / "storage" / "db"
    DB_NAME: str = "db.sqlite"
    
    # Environment variables that can be accessed via API
    CONTENT: Optional[str] = None
    
    class Config:
        env_file = ".env"
        case_sensitive = True
        extra = "ignore"  # Allow extra fields from environment variables


settings = Settings()

# Ensure DB directory exists
settings.DB_DIR.mkdir(parents=True, exist_ok=True)