from dataclasses import dataclass, InitVar, asdict
import orjson
import os


@dataclass
class Config:
    """Track config/settings"""
    id: int = None
    name: str = None
    json_file: InitVar[str] = None
    
    def set_var(self, name, default=None):
        return self.json_data.get(name, os.getenv(name, default))        

    def __post_init__(self, json_file=None):
        """Load data from JSON and/or ENV vars with defaults"""
        self.json_data = {}
        if json_file:
            try:
                with open(json_file, "rb") as f:
                    self.json_data = orjson.loads(f.read())
            except FileNotFoundError:
                print(f'{json_file} not found')
            
        self.id = self.set_var('id', 'ID')
        self.name = self.set_var('name', 'NAME')

        
cfg = Config(json_file="test.json")
print(cfg)
print(asdict(cfg))