# pylint: disable=missing-docstring,unused-argument

from django.http import (HttpResponse, HttpResponseServerError,
                         HttpResponseNotFound)
from edxmako.shortcuts import render_to_string, render_to_response
import functools
from openedx.core.djangolib.js_utils import dump_js_escaped_json

__all__ = ['not_found', 'server_error', 'render_404', 'render_500']


def jsonable_error(status=500, message="The Studio servers encountered an error"):
    """
    A decorator to make an error view return an JSON-formatted message if
    it was requested via AJAX.
    """
    def outer(func):
        @functools.wraps(func)
        def inner(request, *args, **kwargs):
            if request.is_ajax():
                content = dump_js_escaped_json({"error": message})
                return HttpResponse(content, content_type="application/json",
                                    status=status)
            else:
                return func(request, *args, **kwargs)
        return inner
    return outer


@jsonable_error(404, "Resource not found")
def not_found(request):
    return render_to_response('error.html', {'error': '404'})


@jsonable_error(500, "The Studio servers encountered an error")
def server_error(request):
    return render_to_response('error.html', {'error': '500'})


@jsonable_error(404, "Resource not found")
def render_404(request):
    return HttpResponseNotFound(render_to_string('404.html', {}))


@jsonable_error(500, "The Studio servers encountered an error")
def render_500(request):
    return HttpResponseServerError(render_to_string('500.html', {}))
