from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseBadRequest, JsonResponse, HttpResponse
from .models import SyncTask
from .forms import SyncTaskForm
from .jobs import sync_douban_job

import tempfile
import os
from threading import Thread
import openpyxl
from django.utils.datastructures import MultiValueDictKeyError
from openpyxl.utils.exceptions import InvalidFileException
from zipfile import BadZipFile


@login_required
def sync_douban(request):
    """
    Sync douban data from .xlsx file generated by doufen
    """
    if request.method == 'POST':
        # validate sunmitted data
        try:
            uploaded_file = request.FILES['xlsx']
            wb = openpyxl.open(uploaded_file, read_only=True,
                               data_only=True, keep_links=False)
            wb.close()
        except (MultiValueDictKeyError, InvalidFileException, BadZipFile) as e :
            # raise e
            return HttpResponseBadRequest(content="invalid excel file")

        form = SyncTaskForm(request.POST)
        if form.is_valid():
            # stop all preivous task
            SyncTask.objects.filter(user=request.user, is_finished=False).update(is_finished=True)
            form.save()
            temp_dir = tempfile.TemporaryDirectory()
            filename = os.path.join(temp_dir.name, uploaded_file.name)
            with open(filename, 'wb+') as destination:
                for chunk in uploaded_file.chunks():
                    destination.write(chunk)
            task = Thread(
                target=sync_douban_job,
                args=(form.instance, request.user, filename, temp_dir),
                daemon=True
            )
            task.start()

            return HttpResponse(status=204)
        else:
            return HttpResponseBadRequest()
    else:
        return HttpResponseBadRequest()


@login_required
def query_progress(request):
    task = request.user.user_synctasks.order_by('-id').first()
    if task is not None:
        return JsonResponse({
            'progress': task.get_progress()
        })
    else:
        return JsonResponse()


def query_last_task(request):
    task = request.user.user_synctasks.order_by('-id').first()
    if task is not None:
        return JsonResponse({
            'total_items': task.total_items,
            'success_items': task.success_items,
            'finished_items': task.finished_items,
            'status': task.get_status_emoji(),
            'is_finished': task.is_finished,
            'failed_urls': task.failed_urls,
            'ended_time': task.ended_time if task.is_finished else None,
        })
    else:
        return JsonResponse()