from django import forms
from django.db.models import Q
from base.viewsets import BaseTable, BaseViewset
from crud.tables2_columns import CrudLinkColumn
from django_tables2 import Column, LinkColumn, A
from django.shortcuts import reverse
from django.utils.text import mark_safe
import django_filters
from . import models

class FeedCategoryFilterSet(django_filters.FilterSet):
    search_expr = django_filters.CharFilter(label='Search', method='filter_search_expr')

    class Meta:
        fields = ['search_expr']
        model = models.FeedCategory

    def filter_search_expr(self, queryset, name, value):
        return queryset.filter(Q(name__icontains=value) | Q(description__icontains=value))

class FeedCategoryTable(BaseTable):
    rss_url = Column(accessor='pk', verbose_name="RSS URL")
    status = Column(orderable=False)
    delete = CrudLinkColumn('delete', text='', verbose_name='', orderable=False, attrs={'a': {'class': 'btn btn-danger btn-xs glyphicon glyphicon-remove', 'role': 'button'}})

    class Meta(BaseTable.Meta):
        fields = ('name', 'description', 'rss_url', 'days_required', 'status', 'delete')
        order_by = ('name',)

    def render_rss_url(self, value, bound_column):
        rss_url = bound_column._table.view.request.build_absolute_uri(reverse('rss:daily', kwargs={'feed_category_id': value}))
        return mark_safe('<a href="{0}">{0}</a>'.format(rss_url))

class FeedCategoryForm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={'autofocus': True}))

    class Meta:
        model = models.FeedCategory
        fields = ('name', 'description', 'days_required')

class FeedCategoryViewset(BaseViewset):
    lookup_url_kwarg = 'feed_category_id'

    filter_class = FeedCategoryFilterSet
    form_class = FeedCategoryForm
    tables2_class = FeedCategoryTable
    tables2_clickable_rows = True

    detail_view_title = 'Category'
    detail_view_template_name = 'feed_content/feed_category_detail_view.html'

    def get_queryset(self, view):
        return models.FeedCategory.objects.all()


class FeedItemFilterSet(django_filters.FilterSet):
    day_number = django_filters.NumberFilter(label='Day')
    message_text = django_filters.CharFilter(label='Text', lookup_expr='icontains')

    class Meta:
        fields = ('day_number', 'message_text')
        model = models.FeedItem

class FeedItemTable(BaseTable):
    delete = CrudLinkColumn('delete', text='', verbose_name='', orderable=False, attrs={'a': {'class': 'btn btn-danger btn-xs glyphicon glyphicon-remove', 'role': 'button'}})

    class Meta(BaseTable.Meta):
        fields = ('day_number', 'message_text', 'delete')
        order_by = ('day_number',)

class FeedItemForm(forms.ModelForm):
    day_number = forms.IntegerField(required=False, help_text='<ul><li>Leave blank to use the next available day number</li></ul>', widget=forms.TextInput(attrs={'autofocus': True}))
    message_text = forms.CharField(widget=forms.Textarea(attrs={'cols': 40, 'rows': 5}))

    class Meta:
        fields = ('day_number', 'message_text')
        model = models.FeedItem

    def clean_day_number(self):
        day_number = self.cleaned_data['day_number']
        if day_number is None:
            feed_category = self.view.get_cached_object(self.view.viewset.master_viewset)
            queryset = models.FeedItem.objects.filter(feed_category=feed_category).order_by('-day_number')
            if self.instance.id is not None:
                queryset = queryset.exclude(id=self.instance.id)
            items = queryset[:1]
            if items:
                return items[0].day_number + 1
            else:
                return 1
        return day_number

class FeedItemViewset(BaseViewset):
    master_viewset_class = FeedCategoryViewset
    nested_list_view_index = 0
    view_url_kwarg_names = BaseViewset.derive_view_url_kwarg_names(master_viewset_class)

    lookup_url_kwarg = 'feed_item_id'

    filter_class = FeedItemFilterSet
    form_class = FeedItemForm
    tables2_class = FeedItemTable
    tables2_clickable_rows = True

    list_view_title = 'Messages'
    detail_view_title = 'Message'
    detail_view_template_name = 'feed_content/feed_item_detail_view.html'

    def get_queryset(self, view):
        if view is None:
            return models.FeedItem.objects.none()
        return models.FeedItem.objects.filter(feed_category_id=view.kwargs['feed_category_id'])

    def get_master_object(self, view, instance):
        return instance.feed_category

    def create_view_form_valid(self, view, form):
        form.instance.feed_category = view.get_cached_object(self.master_viewset)