#    Society Self-Service
#    Copyright © 2018-2019  Yingtong Li (RunasSudo)
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.

from ratelimit.decorators import ratelimit

from django.contrib.auth.decorators import login_required

from django.conf import settings
from django.db import transaction
from django.http import HttpResponse
from django.shortcuts import render, redirect
from django.urls import reverse
from django.utils import timezone

from . import monboard
from . import models

@login_required
def index(request):
	try:
		member = models.Member.objects.get(email=request.user.email)
	except models.Member.DoesNotExist:
		member = None
		return render(request, 'ssmembership/index.html', {'member': member, 'years': models.Member.YEARS})
	
	if request.method != 'POST':
		return render(request, 'ssmembership/index.html', {'member': member, 'years': models.Member.YEARS})
	
	# Update membership
	member.student_id = request.POST['student_id']
	member.first_name = request.POST['first_name']
	member.last_name = request.POST['last_name']
	member.phone = request.POST['phone']
	member.year = int(request.POST['year'])
	member.is_msa = True if request.POST['is_msa'] == '1' else '0'
	
	errors = member.validation_problems()
	if not member or len(errors) > 0:
		return render(request, 'ssmembership/index.html', {
			'member': member,
			'years': models.Member.YEARS,
			'errors': errors
		})
	
	member.save()
	
	# Update bulletin
	if 'sspromotions' in settings.INSTALLED_APPS:
		import sspromotions.models
		sspromotions.models.BulletinSubscription.set_member_subscribed(member, True if request.POST['bulletin_subscribe'] == '1' else False)
		for group in sspromotions.models.Group.objects.filter(subscribable=True).all():
			if ('bulletin_group_' + str(group.id)) in request.POST and request.POST['bulletin_group_' + str(group.id)]:
				group.subscribe_member(member, True)
			else:
				group.subscribe_member(member, False)
	
	return render(request, 'ssmembership/index.html', {'member': member, 'years': models.Member.YEARS})

def onboard_index(request):
	return render(request, 'ssmembership/onboard/index.html')

def onboard_signed(request):
	if 'email' not in request.GET:
		return HttpResponse('Expected an email address', status=400)
	if 'sig' not in request.GET:
		return HttpResponse('Expected a signature parameter', status=400)
	
	sig_expected = hmac.new(settings.SECRET_KEY_MEMBERSIG.encode('utf-8'), request.GET['email'].encode('utf-8'), 'sha256').hexdigest()
	if not hmac.compare_digest(sig_expected, request.GET['sig']):
		return HttpResponse('Invalid signature', status=403)
	
	member = monboard.by_email(request.GET['email'])
	return render(request, 'ssmembership/onboard/review.html', {
		'member': member,
		'years': models.Member.YEARS,
		'email_orig': member.email if member else None,
		'sig': sig_expected
	})

@ratelimit(key=settings.RATELIMIT_KEY, rate='100/h')
def onboard_search(request):
	if request.method != 'POST':
		return redirect(reverse('onboard_index'))
	
	if request.limited:
		return HttpResponse('Too many requests', status=429)
	
	member = monboard.by_email(request.POST['email'])
	if member and member.student_id != request.POST['student_id']:
		member = None
	
	return render(request, 'ssmembership/onboard/review.html', {
		'member': member,
		'years': models.Member.YEARS,
		'email_orig': member.email if member else None,
		'sig': hmac.new(settings.SECRET_KEY_MEMBERSIG.encode('utf-8'), member.email.encode('utf-8'), 'sha256').hexdigest() if member else None
	})

def onboard_save(request):
	if request.method != 'POST':
		return redirect(reverse('onboard_index'))
	
	sig_expected = hmac.new(settings.SECRET_KEY_MEMBERSIG.encode('utf-8'), request.POST['email_orig'].encode('utf-8'), 'sha256').hexdigest()
	if not hmac.compare_digest(sig_expected, request.POST['sig']):
		return HttpResponse('Invalid signature', status=403)
	
	member = monboard.by_email(request.POST['email_orig'])
	
	if not member:
		return render(request, 'ssmembership/onboard/review.html', {
			'member': member
		})
	
	member.student_id = request.POST['student_id']
	member.email = request.POST['email']
	member.first_name = request.POST['first_name']
	member.last_name = request.POST['last_name']
	member.phone = request.POST['phone']
	member.year = int(request.POST['year'])
	member.is_msa = True if request.POST['is_msa'] == '1' else '0'
	
	errors = member.validation_problems()
	
	if models.Member.objects.filter(email=request.POST['email']).count() > 0:
		errors.append('Member with this email already exists')
	
	if len(errors) > 0:
		return render(request, 'ssmembership/onboard/review.html', {
			'member': member,
			'years': models.Member.YEARS,
			'email_orig': request.POST['email_orig'],
			'sig': request.POST['sig'],
			'errors': errors
		})
	
	with transaction.atomic():
		member.save()
		
		# Update bulletin
		import sspromotions.models
		sspromotions.models.BulletinSubscription.set_member_subscribed(member, True if request.POST['bulletin_subscribe'] == '1' else False)
		for group in sspromotions.models.Group.objects.filter(subscribable=True).all():
			if ('bulletin_group_' + str(group.id)) in request.POST and request.POST['bulletin_group_' + str(group.id)]:
				group.subscribe_member(member, True)
			else:
				group.subscribe_member(member, False)
		
		monboard.delete_by_email(request.POST['email_orig'])
		return render(request, 'ssmembership/onboard/complete.html')

def signup_index(request):
	return render(request, 'ssmembership/signup/index.html', {
		'member': models.Member(),
		'years': models.Member.YEARS
	})

def signup_save(request):
	if request.method != 'POST':
		return redirect(reverse('signup_index'))
	
	member = models.Member()
	member.student_id = request.POST['student_id']
	member.email = request.POST['email']
	member.first_name = request.POST['first_name']
	member.last_name = request.POST['last_name']
	member.phone = request.POST['phone']
	member.year = int(request.POST['year'])
	member.is_msa = True if request.POST['is_msa'] == '1' else '0'
	member.member_type = 2 # Associate Member
	
	# Calculate expiration date
	member.expires = timezone.localtime(timezone.now()).date().replace(month=3, day=20)
	member.expires = member.expires.replace(year=member.expires.year+1)
	if member.expires < timezone.localtime(timezone.now()).date(): # Add 1 year if after Mar 20, else add 2 years
		member.expires = member.expires.replace(year=member.expires.year+1)
	
	errors = member.validation_problems()
	
	if models.Member.objects.filter(email=request.POST['email']).count() > 0:
		errors.append('Member with this email already exists')
	
	if len(errors) > 0:
		return render(request, 'ssmembership/signup/index.html', {
			'member': member,
			'years': models.Member.YEARS,
			'errors': errors
		})
	
	with transaction.atomic():
		member.save()
		
		# Update bulletin
		import sspromotions.models
		sspromotions.models.BulletinSubscription.set_member_subscribed(member, True if request.POST['bulletin_subscribe'] == '1' else False)
		for group in sspromotions.models.Group.objects.filter(subscribable=True).all():
			if ('bulletin_group_' + str(group.id)) in request.POST and request.POST['bulletin_group_' + str(group.id)]:
				group.subscribe_member(member, True)
			else:
				group.subscribe_member(member, False)
		
		return render(request, 'ssmembership/signup/complete.html')