from django.http import JsonResponse
from django.utils.decorators import method_decorator
from django.views.decorators.http import require_POST
from django.views.generic.base import TemplateResponseMixin, View
from django.views.generic.detail import SingleObjectMixin
from django.views.generic.edit import FormMixin, ModelFormMixin, ProcessFormView

# #############################################################################
#  Views for use with AJAX
# #############################################################################


class JsonMixin:
    success = True
    errors = {}

    def get_data(self, **kwargs):
        data = {"success": self.success, "errors": self.errors}
        data.update(kwargs)
        return data

    def render_to_json(self, **kwargs):
        return JsonResponse(self.get_data(**kwargs))


class JsonFormMixin(JsonMixin, FormMixin):
    def form_valid(self, form):
        """If the form is valid, return success"""
        return self.render_to_json()

    def form_invalid(self, form):
        """If the form is invalid, return the errors and no success"""
        return self.render_to_json(success=False, errors=form.errors)


class JsonModelFormMixin(JsonFormMixin, ModelFormMixin):
    def form_valid(self, form):
        """Override form_valid to return a JSON response"""
        self.object = form.save()
        return super().form_valid(form)


class JsonMessageMixin:
    message = ""

    def get_message(self):
        return {"content": self.message, "class": "success"}

    def get_data(self, **kwargs):
        kwargs.update(message=self.get_message())
        return super().get_data(**kwargs)


class JsonDetailView(JsonMixin, SingleObjectMixin, TemplateResponseMixin, View):
    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        context = self.get_context_data(object=self.object)
        return self.render_to_json(html=self.render_to_response(context))


class JsonDeleteView(JsonMessageMixin, JsonDetailView):
    def get(self, request, *args, **kwargs):
        obj = self.get_object()
        obj.delete()
        return self.render_to_json(action="delete")


@method_decorator(require_POST, name="dispatch")
class JsonCreateView(
    JsonMessageMixin, JsonModelFormMixin, TemplateResponseMixin, ProcessFormView
):
    def render_to_json(self, **kwargs):
        context = self.get_context_data(object=self.object)
        kwargs.update(
            html=self.render_to_response(context).rendered_content, action="create"
        )
        return super().render_to_json(**kwargs)


@method_decorator(require_POST, name="dispatch")
class JsonUpdateView(
    JsonMessageMixin, JsonModelFormMixin, TemplateResponseMixin, ProcessFormView
):
    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super().post(request, *args, **kwargs)

    def render_to_json(self, **kwargs):
        context = self.get_context_data(object=self.object)
        kwargs.update(
            html=self.render_to_response(context).rendered_content, action="update"
        )
        return super().render_to_json(**kwargs)