from __future__ import unicode_literals

from django.db import models

from modelcluster.fields import ParentalKey

from wagtail.wagtailcore import blocks
from wagtail.wagtailimages import blocks as imageblocks
from wagtail.wagtailcore.models import Page
from wagtail.wagtailcore.models import Orderable
from wagtail.wagtailcore.fields import RichTextField
from wagtail.wagtailcore.fields import StreamField
from wagtail.wagtailimages.edit_handlers import ImageChooserPanel
from wagtail.wagtailadmin.edit_handlers import InlinePanel
from wagtail.wagtailadmin.edit_handlers import FieldPanel
from wagtail.wagtailadmin.edit_handlers import PageChooserPanel
from wagtail.wagtailadmin.edit_handlers import StreamFieldPanel
from wagtail.wagtailsearch import index


ILLUSTRATION_ANTARCTICA = "antarctica.svg"
ILLUSTRATION_BRIDGE = "bridge.svg"
ILLUSTRATION_CASINO = "casino.svg"
ILLUSTRATION_CRADLE = "cradle.svg"
ILLUSTRATION_DEVIL = "devil.svg"
ILLUSTRATION_FALLS = "falls.svg"
ILLUSTRATION_HOBART = "hobart.svg"
ILLUSTRATION_LAVENDER = "lavender.svg"
ILLUSTRATION_TUZ = "tuz.svg"
ILLUSTRATION_WINEGLASS = "wineglass.svg"

ILLUSTRATION_TYPES = (
    (ILLUSTRATION_ANTARCTICA, "Antarctica"),
    (ILLUSTRATION_BRIDGE, "Bridge"),
    (ILLUSTRATION_CASINO, "Casino"),
    (ILLUSTRATION_CRADLE, "Cradle Mountain"),
    (ILLUSTRATION_DEVIL, "Tasmanian Devil"),
    (ILLUSTRATION_FALLS, "Waterfall"),
    (ILLUSTRATION_HOBART, "Hobart"),
    (ILLUSTRATION_LAVENDER, "Lavender"),
    (ILLUSTRATION_TUZ, "Tuz"),
    (ILLUSTRATION_WINEGLASS, "Wineglass"),
)


class BasicContentBlock(blocks.StructBlock):

    class Meta:
        template = "cms_pages/home_page_blocks/basic_content.html"

    PANEL_BLUE_LEFT = "blue_left"
    PANEL_WHITE_RIGHT = "white_right"
    PANEL_TYPES = (
        (PANEL_BLUE_LEFT, "Left-aligned image, blue-filtered image BG"),
        (PANEL_WHITE_RIGHT, "Right-aligned image, white background"),
    )

    EXTERNAL_LINK_TWITTER = "twitter"
    EXTERNAL_LINK_GENERIC = "generic"

    EXTERNAL_LINK_TYPES = (
        (EXTERNAL_LINK_TWITTER, "Twitter"),
        (EXTERNAL_LINK_GENERIC, "Generic URL"),
    )

    panel_type = blocks.ChoiceBlock(
        choices=PANEL_TYPES,
        required=True,
    )
    heading = blocks.CharBlock(required=True)
    inset_illustration = blocks.ChoiceBlock(
        choices=ILLUSTRATION_TYPES,
        required=True,
    )
    background_image = imageblocks.ImageChooserBlock(
        required=False,
        help_text="This is used as the background image of a "
                  "blue-left block. It's not used for white-right."
    )
    body = blocks.RichTextBlock(required=True)
    link = blocks.StructBlock([
        ("page", blocks.PageChooserBlock()),
        ("title", blocks.CharBlock(required=True)),
    ])
    external_links = blocks.ListBlock(
        blocks.StructBlock([
            ("alt", blocks.CharBlock(required=True)),
            ("icon", blocks.ChoiceBlock(
                choices=EXTERNAL_LINK_TYPES,
                required=True,
            )),
            ("url", blocks.URLBlock(required=True)
        )])
    )

class HomePage(Page):

    body = StreamField([
        ("basic_content", BasicContentBlock()),
        # TODO: keynotes
        # TODO: other bits
    ])

    content_panels = Page.content_panels + [
        StreamFieldPanel('body')
    ]


# Content pages
class AbstractContentPage(Page):

    class Meta:
        abstract = True

    intro = models.CharField(max_length=250)
    body = RichTextField(blank=True)
    background_image = models.ForeignKey(
        'wagtailimages.Image',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+'
    )

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

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


class ContentPage(AbstractContentPage):

    inset_illustration = models.CharField(
        choices=ILLUSTRATION_TYPES,
        max_length=256,
    )

    content_panels = AbstractContentPage.content_panels + [
        FieldPanel('inset_illustration')
    ]


# News pages

class NewsIndexPage(AbstractContentPage):

    def child_pages(self):
        return NewsPage.objects.live().child_of(self).specific().order_by("-date")

    subpage_types = [
        "NewsPage",
    ]

    content_panels = AbstractContentPage.content_panels


class NewsPage(AbstractContentPage):

    date = models.DateField("Post date")

    portrait_image = models.ForeignKey(
        'wagtailimages.Image',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+'
    )

    parent_page_types = [
        NewsIndexPage,
    ]

    content_panels = AbstractContentPage.content_panels + [
        FieldPanel('date'),
        ImageChooserPanel('portrait_image'),
    ]