import concurrent.futures
import io
import os

import oss2
import requests
from PIL import Image

from .log import logger

# oss
access_key_id = os.getenv("ACCESS_KEY_ID")
access_key_secret = os.getenv("ACCESS_KEY_SECRET")
bucket_name = os.getenv("BUCKET_NAME")
endpoint = os.getenv("ENDPOINT")

bucket = oss2.Bucket(oss2.Auth(access_key_id, access_key_secret), endpoint, bucket_name)
oss_path = os.getenv("OSS_PATH")


def download_img_pil(index, img_url):
    r = requests.get(img_url, stream=True)
    if r.status_code == 200:
        img = Image.open(io.BytesIO(r.content))
        return (index, img)
    else:
        logger.error(f"Fail to download: {img_url}")


def download_images(img_urls, batch_size):
    imgs_pil = [None] * batch_size
    with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
        to_do = []
        for i, url in enumerate(img_urls):
            future = executor.submit(download_img_pil, i, url)
            to_do.append(future)

        for future in concurrent.futures.as_completed(to_do):
            ret = future.result()
            index, img_pil = ret
            imgs_pil[index] = img_pil

    return imgs_pil


def upload_np_2_oss(input_image, name="cache.png"):
    assert name.lower().endswith((".png", ".jpg")), name
    imgByteArr = io.BytesIO()
    if name.lower().endswith(".png"):
        Image.fromarray(input_image).save(imgByteArr, format="PNG")
    else:
        Image.fromarray(input_image).save(imgByteArr, format="JPEG", quality=95)
    imgByteArr = imgByteArr.getvalue()

    bucket.put_object(oss_path + "/" + name, imgByteArr)
    ret = bucket.sign_url('GET', oss_path + "/" + name, 60 * 60 * 24)
    del imgByteArr
    return ret