from django.shortcuts import render, get_object_or_404
from django.http import Http404
from django.template import RequestContext
from django.contrib.auth.decorators import login_required
from django.db import connection

from .models import CommitFest


@login_required
def authorstats(request, cfid):
    cf = get_object_or_404(CommitFest, pk=cfid)
    if not request.user.is_staff:
        raise Http404("Only CF Managers can do that.")

    cursor = connection.cursor()
    cursor.execute("""
WITH patches(id,name) AS (
  SELECT p.id, name
   FROM commitfest_patch p
   INNER JOIN commitfest_patchoncommitfest poc ON poc.patch_id=p.id AND poc.commitfest_id=%(cid)s
),
authors(userid, authorpatches) AS (
 SELECT pa.user_id, array_agg(array_to_json(ARRAY[p.id::text, p.name]))
  FROM commitfest_patch_authors pa
  INNER JOIN patches p ON p.id=pa.patch_id
 GROUP BY pa.user_id
),
reviewers(userid, reviewerpatches) AS (
 SELECT pr.user_id, array_agg(array_to_json(ARRAY[p.id::text, p.name]))
  FROM commitfest_patch_reviewers pr
  INNER JOIN patches p ON p.id=pr.patch_id
 GROUP BY pr.user_id
)
SELECT first_name || ' ' || last_name || ' (' || username ||')', authorpatches, reviewerpatches
FROM (authors FULL OUTER JOIN reviewers ON authors.userid=reviewers.userid)
INNER JOIN auth_user u ON u.id=COALESCE(authors.userid, reviewers.userid)
ORDER BY last_name, first_name
""",
                   {
                       'cid': cf.id,
                   })

    return render(request, 'report_authors.html', {
        'cf': cf,
        'report': cursor.fetchall(),
        'title': 'Author stats',
        'breadcrumbs': [{'title': cf.title, 'href': '/%s/' % cf.pk}, ],
    })