import logging

from django.db import models
from wagtail.admin.edit_handlers import FieldPanel, TabbedInterface, ObjectList
from wagtail.core.fields import RichTextField
from wagtail.images.edit_handlers import ImageChooserPanel

from book.blocks import DEFAULT_RICH_TEXT_FEATURES
from core.wagtail_utils import StrictHierarchyPage

logger = logging.getLogger(__name__)


class Module(StrictHierarchyPage):
    class Meta:
        verbose_name = 'Modul'
        verbose_name_plural = 'Module'

    order = models.PositiveIntegerField(null=False, blank=False, help_text='Order of the module')
    meta_title = models.CharField(
        max_length=255,
        help_text='e.g. \'Intro\' or \'Modul 1\''
    )
    hero_image = models.ForeignKey(
        'wagtailimages.Image',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+'
    )

    teaser = models.TextField()
    intro = RichTextField(features=DEFAULT_RICH_TEXT_FEATURES)

    content_panels = [
        FieldPanel('title', classname="full title"),
        FieldPanel('meta_title', classname="full title"),
        ImageChooserPanel('hero_image'),
        FieldPanel('teaser'),
        FieldPanel('intro'),
    ]

    settings_panels = [
        FieldPanel('slug')
    ]

    edit_handler = TabbedInterface([
        ObjectList(content_panels, heading='Content'),
        ObjectList(settings_panels, heading='Settings'),
    ])

    template = 'generic_page.html'

    parent_page_types = ['book.Topic']
    subpage_types = ['book.Chapter']

    def get_child_ids(self):
        return self.get_children().values_list('id', flat=True)