from django import template
from django.conf import settings
from django.contrib.sites.models import Site
from django.urls import reverse
from ..utils import load_package_json, origin, uri

from .. import breadcrumbs
from entries import kinds

register = template.Library()


class MenuItem:
    def __init__(self, label, icon, url):
        self.label = label
        self.icon = icon
        if isinstance(url, str):
            url = (url, ())
        self.url = reverse(url[0], args=url[1])


@register.simple_tag
def get_package_json():
    return load_package_json()


@register.simple_tag
def request_origin(request):
    return origin(request)


@register.simple_tag
def request_uri(request):
    return uri(request)


@register.simple_tag
def site_name():
    return Site.objects.get_current().name


@register.inclusion_tag("lemoncurry/tags/nav.html")
def nav_left(request):
    items = (
        MenuItem(label=k.plural, icon=k.icon, url=("entries:index", (k,)))
        for k in kinds.all
    )
    return {"items": items, "request": request}


@register.inclusion_tag("lemoncurry/tags/nav.html")
def nav_right(request):
    if request.user.is_authenticated:
        items = (
            MenuItem(label="admin", icon="fas fa-cog", url="admin:index"),
            MenuItem(
                label="log out", icon="fas fa-sign-out-alt", url="lemonauth:logout"
            ),
        )
    else:
        items = (
            MenuItem(label="log in", icon="fas fa-sign-in-alt", url="lemonauth:login"),
        )
    return {"items": items, "request": request}


@register.inclusion_tag("lemoncurry/tags/breadcrumbs.html", takes_context=True)
def nav_crumbs(context, route):
    crumbs = breadcrumbs.find(route)
    current = crumbs.pop()

    item_list_element = [
        {
            "@type": "ListItem",
            "position": i + 1,
            "item": {
                "@id": context["origin"] + crumb.url,
                "@type": "WebPage",
                "name": crumb.label,
            },
        }
        for i, crumb in enumerate(crumbs)
    ]
    item_list_element.append(
        {
            "@type": "ListItem",
            "position": len(item_list_element) + 1,
            "item": {
                "id": context["uri"],
                "@type": "WebPage",
                "name": current.label or context.get("title"),
            },
        }
    )

    breadcrumb_list = {
        "@context": "http://schema.org",
        "@type": "BreadcrumbList",
        "itemListElement": item_list_element,
    }

    return {
        "breadcrumb_list": breadcrumb_list,
        "crumbs": crumbs,
        "current": current,
        "title": context.get("title"),
    }


@register.simple_tag
def get_push_hub():
    return settings.PUSH_HUB