# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.shortcuts import render, redirect
from django.views.generic import TemplateView
from django.contrib import messages as flash_messages
from django.db import transaction
from . import models
import json

#import logging
#logger = logging.getLogger('console')

class FeedCategoryImportExcelView(TemplateView):
    template_name = 'feed_content/feed_category_import_excel.html'
    final_breadcrumb = 'Import'

    def get_view_title(self):
        return 'Import {0} from Excel'.format(self.get_object().name)

    def post(self, request, *args, **kwargs):
        try:
            viewset = self.viewset
            category = self.get_object()

            messages_json = request.POST.get('messages_json', '').strip()
            if messages_json == '':
                raise RuntimeError('No import data was specified.')

            messages = json.loads(messages_json)
            messages_to_import = []
            expected_day = 1
            for message in messages:
                day = int(message['day'])
                message_text = message['message_text'].strip()
                if day != expected_day:
                    raise RuntimeError('Expected day {0} but got day {1}.'.format(expected_day, day))
                if message_text == '':
                    raise RuntimeError('Message for day {0} is blank.'.format(day))
                messages_to_import.append({'day': day, 'message_text': message_text})
                expected_day += 1

            if not messages_to_import:
                raise RuntimeError('No import data was specified.')

            with transaction.atomic():
                models.FeedItem.objects.filter(feed_category=category).delete()
                for message in messages_to_import:
                    models.FeedItem.objects.create(
                        feed_category=category,
                        day_number=message['day'],
                        message_text=message['message_text']
                    )

            flash_messages.add_message(request, flash_messages.SUCCESS, 'Import succeeded.');

        except Exception as e:
            flash_messages.add_message(request, flash_messages.ERROR, 'IMPORT FAILED: {0}'.format(e.message))

        return redirect(viewset.get_view_url(viewset.instance_breadcrumb_view_type, self, request.GET, self.get_object()))