import importlib
import requests
from pathlib import Path
from os.path import dirname

from omegaconf import OmegaConf
from tqdm import tqdm


PROJECT_DIR = dirname(dirname(dirname(__file__)))
CONFIG_FOLDER =  f'{PROJECT_DIR}/assets/config'
MODEL_FOLDER =  f'{PROJECT_DIR}/assets/models'


def download_file(url, save_path, chunk_size=1024):
    try:
        save_path = Path(save_path)
        if save_path.exists():
            print(f'{save_path.name} exists')
            return
        save_path.parent.mkdir(exist_ok=True, parents=True)
        resp = requests.get(url, stream=True)
        total = int(resp.headers.get('content-length', 0))
        with open(save_path, 'wb') as file, tqdm(
            desc=save_path.name,
            total=total,
            unit='iB',
            unit_scale=True,
            unit_divisor=1024,
        ) as bar:
            for data in resp.iter_content(chunk_size=chunk_size):
                size = file.write(data)
                bar.update(size)
        print(f'{save_path.name} download finished')
    except Exception as e:
        raise Exception(f"Download failed: {e}")


def get_obj_from_str(string):
    module, cls = string.rsplit(".", 1)
    try:
        return getattr(importlib.import_module(module, package=None), cls)
    except:
        return getattr(importlib.import_module('lib.' + module, package=None), cls)


def load_obj(path):
    objyaml = OmegaConf.load(path)
    return get_obj_from_str(objyaml['__class__'])(**objyaml.get("__init__", {}))