#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    openslides.mediafile.views
    ~~~~~~~~~~~~~~~~~~~~~~~~~~

    Views for the mediafile app.

    :copyright: 2011–2013 by OpenSlides team, see AUTHORS.
    :license: GNU GPL, see LICENSE for more details.
"""

from django.core.urlresolvers import reverse
from django.utils.translation import ugettext as _

from openslides.utils.template import Tab
from openslides.utils.views import ListView, CreateView, UpdateView, DeleteView

from .models import Mediafile
from .forms import MediafileNormalUserCreateForm, MediafileUpdateForm


class MediafileListView(ListView):
    """View to see a table of all uploaded files."""
    model = Mediafile

    def has_permission(self, request, *args, **kwargs):
        return (request.user.has_perm('mediafile.can_see') or
                request.user.has_perm('mediafile.can_upload') or
                request.user.has_perm('mediafile.can_manage'))


class MediafileCreateView(CreateView):
    """View to upload a new file

    A manager can also set the uploader, else the request user is set as uploader.

    """
    model = Mediafile
    permission_required = 'mediafile.can_upload'
    success_url_name = 'mediafile_list'

    def get_form(self, form_class):
        form_kwargs = self.get_form_kwargs()
        if self.request.method == 'GET':
            form_kwargs['initial'].update({'uploader': self.request.user.person_id})  # TODO: Check this.
        if not self.request.user.has_perm('mediafile.can_manage'):
            # Return our own ModelForm
            return MediafileNormalUserCreateForm(**form_kwargs)
        else:
            # Return a ModelForm created by Django.
            return form_class(**form_kwargs)

    def manipulate_object(self, *args, **kwargs):
        if not self.request.user.has_perm('mediafile.can_manage'):
            self.object.uploader = self.request.user
        return super(MediafileCreateView, self).manipulate_object(*args, **kwargs)


class MediafileUpdateView(UpdateView):
    """View to edit the entry of an uploaded file."""
    model = Mediafile
    permission_required = 'mediafile.can_manage'
    form_class = MediafileUpdateForm
    success_url_name = 'mediafile_list'

    def get_form_kwargs(self, *args, **kwargs):
        form_kwargs = super(MediafileUpdateView, self).get_form_kwargs(*args, **kwargs)
        form_kwargs['initial'].update({'uploader': self.object.uploader.person_id})
        return form_kwargs


class MediafileDeleteView(DeleteView):
    """View to delete the entry of an uploaded file and the file itself."""
    model = Mediafile
    permission_required = 'mediafile.can_manage'
    success_url_name = 'mediafile_list'

    def case_yes(self, *args, **kwargs):
        """Deletes the file in the filesystem, if user clicks "Yes"."""
        self.object.mediafile.delete()
        return super(MediafileDeleteView, self).case_yes(*args, **kwargs)


def register_tab(request):
    """Inserts a new Tab to the views for files."""
    selected = request.path.startswith('/mediafile/')
    return Tab(
        title=_('Media'),
        app='mediafile',  # TODO: Rename this to icon='mediafile' later
        stylefile='styles/mediafile.css',
        url=reverse('mediafile_list'),
        permission=(request.user.has_perm('mediafile.can_see') or
                    request.user.has_perm('mediafile.can_upload') or
                    request.user.has_perm('mediafile.can_manage')),
        selected=selected)