from django.db import models

from modelcluster.fields import ParentalKey

from wagtail.core.models import Page, Orderable
from wagtail.core.fields import RichTextField
from wagtail.admin.edit_handlers import FieldPanel, InlinePanel
from wagtail.images.edit_handlers import ImageChooserPanel
from wagtail.search import index


class CategoryList(Page):
    intro = RichTextField(blank=True)
    image = models.ForeignKey(
        'wagtailimages.Image', on_delete=models.PROTECT, related_name='+'
    )

    parent_page_types = ['home.HomePage', ]

    content_panels = Page.content_panels + [
        FieldPanel('intro', classname="full"),
        ImageChooserPanel('image'),
    ]


class Product(Page):
    price = models.PositiveIntegerField()
    description = RichTextField(blank=True)

    def main_image(self):
        gallery_item = self.gallery_images.first()
        if gallery_item:
            return gallery_item.image
        else:
            return None

    parent_page_types = ['catalog.CategoryList', ]

    search_fields = Page.search_fields + [
        index.SearchField('description'),
    ]

    content_panels = Page.content_panels + [
        FieldPanel('price'),
        FieldPanel('description', classname="full"),
        InlinePanel('product_images', label="Obrázky"),
    ]



class ProductImage(Orderable):
    page = ParentalKey(Product, on_delete=models.CASCADE, related_name='product_images')
    image = models.ForeignKey(
        'wagtailimages.Image', on_delete=models.CASCADE, related_name='+'
    )
    caption = models.CharField(blank=True, max_length=250)

    panels = [
        ImageChooserPanel('image'),
        FieldPanel('caption'),
    ]