from pkg_resources import parse_version

from django_select2.forms import ModelSelect2Widget, HeavySelect2Widget
from django_hstore.forms import DictionaryFieldWidget

from django import get_version
from django.urls import reverse
from django.conf import settings
from django.utils.safestring import mark_safe
from django.template import Context
from django.template.loader import get_template
from django.contrib.admin.widgets import AdminTextareaWidget


class ItemSelectWidget(ModelSelect2Widget):

    def __init__(self, *args, **kwargs):
        kwargs['data_view'] = 'item-complete'
        super(ItemSelectWidget, self).__init__(*args, **kwargs)

    def label_from_instance(self, obj):
        return obj.name


class PropsSelectWidget(DictionaryFieldWidget):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def render(self, name, value, attrs=None):
        if attrs is None:
            attrs = {}
        # it's called "original" because it will be replaced by a copy
        attrs['class'] = 'hstore-original-textarea'
        w = HeavySelect2Widget(data_view='prop-complete', attrs={'data-tags': 'true', 'class': 'hs-key'})

        # get default HTML from AdminTextareaWidget
        html = AdminTextareaWidget.render(self, name, value, attrs)
        # prepare template context
        template_context = Context({
            'field_name': name,
            'STATIC_URL': settings.STATIC_URL,
            'use_svg': parse_version(get_version()) >= parse_version('1.9'),  # use svg icons if django >= 1.9
            'ajax_url': reverse('prop-complete'),
            'w': w.build_attrs()
        })
        # get template object
        template = get_template('hstore_%s_widget.html' % self.admin_style)
        # render additional html
        additional_html = template.render(template_context)

        # append additional HTML and mark as safe
        html = html + additional_html
        html = mark_safe(html)

        return html