# -*- encoding: utf-8 -*-

from datetime import date, datetime, timedelta       # timeSlices
from collections import OrderedDict

import django
from django.http import HttpResponse, HttpResponseRedirect
from django.template import Template, RequestContext, loader
from django.shortcuts import render

from django.contrib.auth.decorators import login_required
from django.urls import reverse  
from django.views.decorators.csrf import ensure_csrf_cookie
from django import forms
from django.forms import ModelForm
from django.contrib import messages
from django.utils.translation import ugettext_lazy as _
from django.utils.translation import pgettext, pgettext_lazy

from django.db import transaction
from django.db.models import F

from django.core.exceptions import ValidationError

import logging

from django.conf import settings as appSettings

from . import models
from . import forms
from . import auth as nalodeni_auth

# Logger instance
logger = logging.getLogger(__name__)

def role_required(roles=[]):
    def decorate(func):
        def call(request, *args, **kwargs):
            for r in roles:
                if not r in request.session['site_perms']:
                    messages.error(request, "Nedostatečné oprávnění pro přístup. Detaily byly zaznamenány.")
                    return HttpResponseRedirect('/')
            result = func(request, *args, **kwargs)
            return result
        return call
    return decorate

def get_AppUser_objects(request):
    ''' Zkontroluje, že všechny objekty v 'objs' vyhovují přiděleným rolím.
        Nevyhovující vyřadí.
    '''
    sp = request.session['site_perms']
    if 'sso_kodo' not in sp:
        return models.AppUser.objects.none()

    if 'sso_admin' in sp:
        return models.AppUser.objects.all()

    objs = models.AppUser.objects.filter(district__in=request.session['spc']['dist'])

    return objs

def get_AppUser_districts(request):
    '''Vrátí dostupné kraje podle rolí.'''


    if 'sso_admin' in request.session['site_perms']:
        return list(models.AppUser.DISTRICT_CHOICES)

    rslt = []
    for d in models.AppUser.DISTRICT_CHOICES:
        if d[0] in request.session['spc']['dist']:
            rslt.append(d)

    return rslt
    

@ensure_csrf_cookie
@login_required(login_url="/prihlaseni")
@role_required(['sso_kodo'])
def confirmed(request, newOnly=False, dist=None):
    if dist is None:
        dist = int(request.POST.get('dist', -1))

    objs = get_AppUser_objects(request).order_by('last_name', 'first_name' ,'email')

    if newOnly:
        objs = objs.filter(status=models.AppUser.STATUS_NEW)
    else:
        objs = objs.filter(status=models.AppUser.STATUS_REG)

    districts = [(-1, ' -- vše dostupné -- ')] + get_AppUser_districts(request)
    # filtrujeme jen povolene kraje, nebo vse pro adminy
    if dist != -1 and (dist in request.session['spc']['dist'] or 'sso_admin' in request.session['site_perms']):
        selDist = dist
        objs = objs.filter(district=selDist)
    else:
        selDist = -1


    template = 'people/list.html'
    context = {
        'people' : objs,
        'newOnly' : newOnly,
        'distAvail' : districts,
        'selDist' : selDist,
        }

    return render(request, template, context)


@ensure_csrf_cookie
@login_required(login_url="/prihlaseni")
@role_required(['sso_kodo'])
def pending(request):
    ''' List pending registrations from AppRegEmail. '''

    show_all = request.GET.get("show_all","no") == "yes"

    if request.method == "POST":
        act = request.POST.get("action", None)
        ids = request.POST.getlist('r[]')

        objs = models.AppRegEmail.objects.filter(id__in = ids)

        if act == "token":
            email_counter = 0
            skipped_counter = 0
            for o in objs:
                # kontrola, jestli uživatel již není registrován
                rslt = models.AppUser.objects.filter(email__iexact=o.email.strip())
                if len(rslt) != 0:
                    messages.info(request,'Uživatel s emailem %s již je registrován, požadavek na registaci odstraněn.' % o.email)
                    o.delete()
                else:
                    if not ( o.etStamp and (datetime.now() - o.etStamp).total_seconds() < int(appSettings.TOKEN_VALID_SEC)):
                        # token not valid or not sent
                        nalodeni_auth.sendRegisterToken(o.email)
                        email_counter += 1
                    else:
                        skipped_counter += 1
            if email_counter > 0:
                messages.info(request,'Registrační emaily odeslány, celkem odesláno %s zpráv.' % email_counter)
            if skipped_counter > 0:
                messages.info(request,'Celkem %s registrací přeskočeno, ještě jsou platné.' % skipped_counter)
            
        elif act == "delete":
            objs.delete()
            messages.info(request,'Registrace odstraněny.')

    tokenValidAfter = datetime.now() - timedelta(seconds=int(appSettings.TOKEN_VALID_SEC))

    objs = models.AppRegEmail.objects.all()
    if not show_all:
        # zobrazovat pouze nové registrace
        objs = objs.filter(emailToken = None)
    objs = objs.order_by('etStamp')

    template = 'people/pending.html'
    context = {
        'people' : objs,
        'tokenValidAfter' : tokenValidAfter,
        'show_all' : show_all,
        }

    return render(request, template, context)



@ensure_csrf_cookie
@login_required(login_url="/prihlaseni")
@role_required(['sso_kodo'])
def update(request):
    ids = request.POST.getlist('r[]')
    val = request.POST.get('setStatus', None)

    if val and val in ['reg','new']:
        objs = get_AppUser_objects(request).filter(id__in=ids)

        rec = 0
        for o in objs:
            rec += 1
            o.status = o.STATUS_REG if val == 'reg' else o.STATUS_NEW
            o.save()

            messages.info(request, 'Upraveno celkem %s záznamů.' % rec)

        if val == 'new':
            return HttpResponseRedirect('/people/list/')
        elif val == "reg":
            return HttpResponseRedirect('/people/list-new/')
    else:
        messages.error(request, 'Špatný požadavek.')
    

    return HttpResponseRedirect('/people/list/')