# -*- coding: utf-8 -*-

from collections import namedtuple

from django.utils.translation import ugettext as _

from course_modes.models import CourseMode
from opaque_keys.edx.keys import CourseKey


BreadcrumbsItem = namedtuple('BreadcrumbsItem', ['path', 'name'])

def breadcrumbs(url, current_page):
    """
    Returns a BreadcrumbsItem list of pairs (path, i18ned name) of length from 2 to 3
    as the breadcrumb for current url
    The tricky part is the replacement of edX's courses page by ours.
    When length is 3. The first item is the home page.
            The last item is the current page. The middle item, if present, points to the parent
            page of the current page.
    See tests.test_breadcrumbs to understand awaited behaviour
    """
    mapping = {
        'contact': _("Contact"),
        'courses': _("All courses"),    # edX page
        'cours': _("All courses"),      # FUN page
        'news': _("News"),
        'universities': _("Universities"),
    }
    result = [BreadcrumbsItem(path='/', name=_(u"Home"))]

    items = url.split('/')[1:]  # split and remove first backslash

    if len(items) > 1 and items[1] and items[0] not in ['accounts', 'payment']:
        if items[0] == 'courses':
            items[0] = 'cours'

        result.append(BreadcrumbsItem(path='/%s/' % items[0], name=mapping[items[0]]))

    result.append(BreadcrumbsItem(path='#', name=current_page))
    return result


def is_paid_course(course_id):
    """
    Returns available course modes for course.
    Args:
        course_id: string like org/number/session
    Return:
        dict of coursemode: price: {'verified': 100, 'honor': 0}
    """
    course_modes = {}
    course_key = CourseKey.from_string(course_id)
    modes = CourseMode.objects.filter(course_id=course_key).values('mode_slug', 'min_price')
    if modes:
        course_modes = {mode['mode_slug']: mode['min_price'] for mode in modes}
    return course_modes