import json

from django import forms
from django.conf import settings
from django.contrib import messages
from django.core.exceptions import ImproperlyConfigured
from django.views.generic import TemplateView

from djrill import MANDRILL_API_URL

import requests


class DjrillAdminMedia(object):
    def _media(self):
        js = ["js/core.js", "js/jquery.min.js", "js/jquery.init.js"]

        return forms.Media(js=["%s%s" % (settings.STATIC_URL, url)
            for url in js])
    media = property(_media)


class DjrillApiMixin(object):
    """
    Simple Mixin to grab the api info from the settings file.
    """
    def __init__(self):
        self.api_key = getattr(settings, "MANDRILL_API_KEY", None)
        self.api_url = MANDRILL_API_URL

        if not self.api_key:
            raise ImproperlyConfigured("You have not set your mandrill api key "
                "in the settings file.")

    def get_context_data(self, **kwargs):
        kwargs = super(DjrillApiMixin, self).get_context_data(**kwargs)

        status = False
        req = requests.post("%s/%s" % (self.api_url, "users/ping.json"),
            data={"key": self.api_key})
        if req.status_code == 200:
            status = True

        kwargs.update({"status": status})
        return kwargs


class DjrillApiJsonObjectsMixin(object):
    """
    Mixin to grab json objects from the api.
    """
    api_uri = None

    def get_api_uri(self):
        if self.api_uri is None:
            raise NotImplementedError("%(cls)s is missing an api_uri. Define "
                "%(cls)s.api_uri or override %(cls)s.get_api_uri()." % {
                    "cls": self.__class__.__name__
                })

    def get_json_objects(self, extra_dict=None, extra_api_uri=None):
        request_dict = {"key": self.api_key}
        if extra_dict:
            request_dict.update(extra_dict)
        payload = json.dumps(request_dict)
        api_uri = extra_api_uri or self.api_uri
        req = requests.post("%s/%s" % (self.api_url, api_uri),
            data=payload)
        if req.status_code == 200:
            return req.content
        messages.error(self.request, self._api_error_handler(req))
        return json.dumps("error")

    def _api_error_handler(self, req):
        """
        If the API returns an error, display it to the user.
        """
        content = json.loads(req.content)
        return "Mandrill returned a %d response: %s" % (req.status_code,
            content["message"])


class DjrillIndexView(DjrillApiMixin, TemplateView):
    template_name = "djrill/status.html"

    def get(self, request, *args, **kwargs):

        payload = json.dumps({"key": self.api_key})
        req = requests.post("%s/users/info.json" % self.api_url, data=payload)

        return self.render_to_response({"status": json.loads(req.content)})


class DjrillSendersListView(DjrillAdminMedia, DjrillApiMixin,
    DjrillApiJsonObjectsMixin, TemplateView):

    api_uri = "users/senders.json"
    template_name = "djrill/senders_list.html"

    def get(self, request, *args, **kwargs):
        objects = self.get_json_objects()
        context = self.get_context_data()
        context.update({
            "objects": json.loads(objects),
            "media": self.media,
        })

        return self.render_to_response(context)


class DjrillTagListView(DjrillAdminMedia, DjrillApiMixin,
    DjrillApiJsonObjectsMixin, TemplateView):

    api_uri = "tags/list.json"
    template_name = "djrill/tags_list.html"

    def get(self, request, *args, **kwargs):
        objects = self.get_json_objects()
        context = self.get_context_data()
        context.update({
            "objects": json.loads(objects),
            "media": self.media,
        })
        return self.render_to_response(context)


class DjrillUrlListView(DjrillAdminMedia, DjrillApiMixin,
    DjrillApiJsonObjectsMixin, TemplateView):

    api_uri = "urls/list.json"
    template_name = "djrill/urls_list.html"

    def get(self, request, *args, **kwargs):
        objects = self.get_json_objects()
        context = self.get_context_data()
        context.update({
            "objects": json.loads(objects),
            "media": self.media
        })
        return self.render_to_response(context)
