from django.utils.translation import get_language_info
from django.utils.translation import gettext_lazy as _
from django.utils.translation import activate as activate_lang
from django.utils.translation import get_language
from django.template.response import TemplateResponse
from django.utils.safestring import mark_safe
from django.urls import reverse, resolve
from django.shortcuts import render
from navbar.models import Element
from django.conf import settings
from django import template
import re


register = template.Library()
path_re = re.compile("^(/[a-z]+)/(.*)")


def get_lang_name(lang_code):
    li = get_language_info(lang_code)
    return li["name_local"]


def get_lang_data(path_info, lang_code, curr_lang):
    lang_name = get_lang_name(lang_code)
    rm = resolve(path_info)
    activate_lang(lang_code)
    if path_info == "/":
        lang_url = f"/{lang_code}/"
    else:
        lang_url = reverse(
            rm.view_name, current_app="npb", args=rm.args, kwargs=rm.kwargs
        )
    activate_lang(curr_lang)
    return (lang_code, lang_name, lang_url)


def get_base_context(lang, url):
    return {
        "user": None,
        "current_url": url,
        "elems": Element.objects.filter(parent=None).order_by("weight"),
        "current_lang_code": lang,
        "current_lang_name": get_lang_name(lang),
        "all_langs": [get_lang_data(url, l[0], lang) for l in settings.LANGUAGES],
    }


@register.simple_tag(takes_context=True)
def navbar(context):
    request = context["request"]
    curr_lang = get_language()
    ctx = get_base_context(curr_lang, request.path_info)
    ctx["user"] = request.user
    tpl = TemplateResponse(request, "navbar/navbar.html", context=ctx).render()
    return mark_safe(tpl.rendered_content)