from wagtail.api import APIField
from wagtail.blocks import (
    CharBlock,
    ChoiceBlock,
    RichTextBlock,
    StreamBlock,
    StructBlock,
)
from wagtail.embeds.blocks import EmbedBlock
from wagtail.images.blocks import ImageChooserBlock


class ImageBlock(StructBlock):
    image = ImageChooserBlock(required=True)
    caption = CharBlock(required=False)
    attribution = CharBlock(required=False)

    api_fields = [
        APIField('image'),
        # Adds a URL to a rendered thumbnail of the image to the API
        APIField('caption'),
        APIField('attribution'),
    ]

    class Meta:
        icon = "image"
        template = "base/blocks/image_block.html"


class HeadingBlock(StructBlock):
    heading_text = CharBlock(classname="title", required=True)
    size = ChoiceBlock(
        choices=[
            ("", "Select a heading size"),
            ("h2", "H2"),
            ("h3", "H3"),
            ("h4", "H4"),
        ],
        blank=True,
        required=False,
    )

    class Meta:
        icon = "title"
        template = "base/blocks/heading_block.html"


class BaseStreamBlock(StreamBlock):
    heading_block = HeadingBlock()
    paragraph_block = RichTextBlock(icon="pilcrow")
    image_block = ImageBlock()
    embed_block = EmbedBlock(
        help_text="Insert a URL to embed. For example, https://www.youtube.com/watch?v=SGJFWirQ3ks",
        icon="media",
    )