import json

from django.template.loader import render_to_string
from django.utils.translation import ugettext_lazy as _

from wagtail.admin.widgets import AdminChooser


class AdminSnippetChooser(AdminChooser):

    def __init__(self, model, **kwargs):
        self.target_model = model
        name = self.target_model._meta.verbose_name
        self.choose_one_text = _('Choose %s') % name
        self.choose_another_text = _('Choose another %s') % name
        self.link_to_chosen_text = _('Edit this %s') % name

        super().__init__(**kwargs)

    def render_html(self, name, value, attrs):
        instance, value = self.get_instance_and_id(self.target_model, value)

        original_field_html = super().render_html(name, value, attrs)

        return render_to_string("wagtailsnippets/widgets/snippet_chooser.html", {
            'widget': self,
            'model_opts': self.target_model._meta,
            'original_field_html': original_field_html,
            'attrs': attrs,
            'value': value,
            'item': instance,
        })

    def render_js_init(self, id_, name, value):
        model = self.target_model

        return "createSnippetChooser({id}, {model});".format(
            id=json.dumps(id_),
            model=json.dumps('{app}/{model}'.format(
                app=model._meta.app_label,
                model=model._meta.model_name)))

    class Media:
        js = [
            'wagtailsnippets/js/snippet-chooser-modal.js',
            'wagtailsnippets/js/snippet-chooser.js',
        ]