#  This Source Code Form is subject to the terms of the Mozilla Public
#  License, v. 2.0. If a copy of the MPL was not distributed with this
#  file, You can obtain one at https://mozilla.org/MPL/2.0/.
import uuid

import xxhash

from classquiz.config import redis, storage
from tempfile import SpooledTemporaryFile

from classquiz.db.models import StorageItem
from classquiz.storage.errors import DeletionFailedError


async def clean_editor_images_up(ctx):
    print("Cleaning images up")
    edit_sessions = await redis.smembers("edit_sessions")
    for session_id in edit_sessions:
        session = await redis.get(f"edit_session:{session_id}")
        if session is None:
            images = await redis.lrange(f"edit_session:{session_id}:images", 0, 3000)
            if len(images) != 0:
                try:
                    await storage.delete(images)
                except DeletionFailedError:
                    print("Deletion Error", images)
            await redis.srem("edit_sessions", session_id)
            await redis.delete(f"edit_session:{session_id}:images")


async def calculate_hash(ctx, file_id_as_str: str):
    print("Calculating hash")
    file_id = uuid.UUID(file_id_as_str)
    file_data = await StorageItem.objects.get(id=file_id)
    file_path = file_id.hex
    if file_data.storage_path is not None:
        file_path = file_data.storage_path
    file = SpooledTemporaryFile()
    file.write((await storage.download(file_path)).getbuffer().tobytes())
    hash_obj = xxhash.xxh3_128()
    # assert hash_obj.block_size == 64
    while chunk := file.read(6400):
        hash_obj.update(chunk)
    file_data.hash = hash_obj.digest()
    print("Got hash!")
    await file_data.update()
    file.close()