from django.shortcuts import render
from django.views import View
from django.views.generic.base import TemplateView
from django.conf import settings
from django.http import HttpResponse
from django.http import HttpResponseRedirect
from django.db.models import Max
import requests
import hashlib
import json
from .models import User
from .models import Show
from .models import Submission
from .models import DiscussionBoard

# Create your views here.
# Redirect url should point to this view
class LoginRedirect(View):
    def get(self, req):
        
        # Check request has correct arguments
        request_valid = 'state' in req.GET and 'code' in req.GET
        if not request_valid:
            r = HttpResponse('<h1>Error</h1><p>There was an error in your request.  Please <a href=/login>try again</a></p>')
            r.status = 400
            return r

        # Check state
        userstate = generateState(req)
        if userstate == req.GET['state']:
            code = req.GET['code']
            resp = requests.post(
                    settings.AUTH_TOKEN_ENDPOINT+"token",
                    data={
                        'grant_type':'authorization_code',
                        'code':code,
                        'redirect_uri':settings.AUTH_REDIRECT_URL,
                        'client_id':settings.AUTH_CLIENT_ID
                    },
                    headers = {
                        'Authorization':'Basic %s'%settings.AUTH_B64
                    }
            )
            resp_json = resp.json()
            if 'error' in resp_json:
                r = HttpResponse('<h1>OAuth Error</h1><pre>%s</pre>'%json.dumps(resp_json))
                r.status = 500
                return r
            else:
                user_info = requests.get(
                        settings.AUTH_TOKEN_ENDPOINT+"user",
                        headers = {
                            'Authorization': 'Bearer ' + resp_json['access_token']
                        }
                ).json()
                req.session['user_id'] = user_info['uuid']
                matches = User.objects.filter(user_id=user_info['uuid'])
                match = None
                if not len(matches):
                    user = User(
                            user_id = user_info['uuid'],
                            email = user_info['email'],
                            display_name = user_info['display_name']
                    )
                    user.save()
                    match = user
                else:
                    match = matches[0]
                req.session['token'] = resp_json['access_token']
                req.session['disp_name'] = match.display_name
                return HttpResponseRedirect('/')
        else:
            return HttpResponse('<h1>Unmatching state tokens</h1><br><p>It looks like the request to login wasn\'t started by you.  Try going back to the home page and logging in again.</p>', status=400)

class Login(View):
    def get(self, req):
        url = '%sauthorize?response_type=code&client_id=%s&redirect_uri=%s&scope=email&state=%s'%(settings.AUTH_TOKEN_ENDPOINT,settings.AUTH_CLIENT_ID,settings.AUTH_REDIRECT_URL, generateState(req))
        response = HttpResponse("Redirecting you to the IcyNet auth page...")
        response.status_code = 302
        response['Location'] = url
        return response

def generateState(request):
    request.session.save()

    m = hashlib.sha256()
    m.update(bytearray(request.session.session_key, 'utf-8'))
    m.update(bytearray(settings.SECRET_KEY, 'utf-8'))
    return m.hexdigest()

class LandingPage(TemplateView):

    template_name = "landing_page.html"

    def get_context_data(self, **kwargs):
        ctx = super().get_context_data()
        ctx['recent'] = Show.objects.annotate(recency=Max('episodes__airdate')).order_by('-recency')[:8]
        ctx['stats'] = {
            'shows': Show.objects.count(),
            'episodes': Submission.objects.count(),
            'boards': DiscussionBoard.objects.count()
        }
        return ctx