import os
# Example usage:
import json
LOCAL_COURSE_DATA_DIR = "data/course/" # only use locally, not for other .py files

class Course:
    def __init__(self, course_name, course_id, course_auther, course_img_path, lessons, description):
        self.course_name = course_name 
        self.course_id = course_id 
        self.course_auther = course_auther  
        self.course_img_path = course_img_path  
        self.lessons = lessons
        self.description = description


    def __json__(self):
        return {
            'course_id': self.course_id,
            'course_name': self.course_name,
            'course_auther': self.course_auther,
            'course_img_path': self.course_img_path,
            'lessons': self.lessons,
            'description': self.description
        }
    def to_json(self):
        return json.dumps(self, default=lambda o: o.__json__(), indent=4)   
    
def load_course_from_json(course_id, course_data_dir = None)-> Course:
    try:
        COURSE_DATA_DIR = course_data_dir if course_data_dir else LOCAL_COURSE_DATA_DIR
        with open(os.path.join(COURSE_DATA_DIR, f'{course_id}.json'), "r") as f:
            raw_json = f.read()
            user_data = json.loads(raw_json)
            return Course(**user_data)
    except Exception as e:
        print(e)
        return None

if(__name__ == "__main__"):

    user = load_course_from_json('CS101')