import logging

import os

import random

from django.contrib import messages

from django.shortcuts import redirect, render

from .forms import UploadForm

CCS_UPLOAD_PATH = '/tmp/'

logger = logging.getLogger(__name__)

def upload(request):

    if request.method == 'POST':

        form = UploadForm(request.POST, request.FILES)

        if form.is_valid():

            file = request.FILES['file']

            _handle_uploaded_file(file)

            messages.add_message(request, messages.INFO, '"{}" was successfully uploaded.'.format(file.name))

            return redirect('ccs_upload:form')

    else:

        form = UploadForm()

    return render(request, 'ccs_upload/upload.html', {'form': form})

def _handle_uploaded_file(f):

    filename = _hash_prefixed_filename(f.name)

    path = os.path.join(CCS_UPLOAD_PATH, filename)

    with open(path, 'wb+') as destination:

        for chunk in f.chunks():

            destination.write(chunk)

    logger.info('Wrote uploaded file to {}.'.format(path))

def _hash_prefixed_filename(name: str) -> str:

    return '{hash:x} {name}'.format(hash=random.getrandbits(32), name=name)