from datetime import datetime

from django.contrib.auth import get_user_model
from django.contrib.contenttypes.models import ContentType
from django.contrib.staticfiles.storage import staticfiles_storage
from django.utils.timezone import now
from django.db.models import Max

from apps.notification.models import UserNotification
from apps.notification.utils import send_email
from apps.payment.models import SchoolPayment, CoursePayment, Payment, UserGiftCertificate
from project.celery import app
from project.utils.db import format_sql, execute_sql
from project.sengrid import get_sendgrid_client


User = get_user_model()


@app.task
def send_certificates(email=None, date=None, dry_run=False):
    path_pattern = 'img/user-certificates/%d.jpg'
    if email:
        file = open(staticfiles_storage.path(path_pattern % 1), 'rb')
        try:
            send_email('Грамота от Lil School', email, 'notification/email/certificate.html',
                       attachments=[(file.name, file.read(), 'image/jpeg')])
        except:
            pass
        else:
            print('Email has been sent')
        finally:
            file.close()
            return

    date = datetime.strptime(date, '%d-%m-%Y').date() if date else now().date()
    today = now().date()
    users = set(list(SchoolPayment.objects.filter(date_end=date, add_days=False).values_list('user_id', flat=True)))
    user_notifications_qs = UserNotification.objects.filter(user_id__in=users)
    user_notifications = {un.user_id: un for un in user_notifications_qs}
    notified_users = user_notifications_qs.filter(certificate_last_email__date=today).values_list(
        'user_id', flat=True).distinct()
    for user_id in users:
        if user_id in notified_users:
            print('skip', user_id)
            continue
        un = user_notifications.get(user_id, UserNotification(user_id=user_id))
        print(un.user.email)
        if dry_run:
            continue

        un.certificate_number = un.certificate_number + 1 \
            if un.certificate_number and staticfiles_storage.exists(path_pattern % (un.certificate_number + 1)) \
            else 1
        file = open(staticfiles_storage.path(path_pattern % un.certificate_number), 'rb')
        try:
            send_email('Грамота от Lil School', un.user.email, 'notification/email/certificate.html',
                       attachments=[(file.name, file.read(), 'image/jpeg')], user_notification=un)
        except:
            print('Not OK')
            continue
        finally:
            file.close()
        un.certificate_last_email = now()
        un.save()


@app.task
def sendgrid_update_recipients():
    date_format = '%m/%d/%Y'
    ct_course = ContentType.objects.get_for_model(CoursePayment).id
    ct_school = ContentType.objects.get_for_model(SchoolPayment).id
    course_payments_sql = '''
    select {p.user}, max({p.created_at}) from {p} where {p}.polymorphic_ctype_id = {ct} group by {p.user}
    '''
    course_payments = {p[0]: p[1] for p in execute_sql(format_sql(course_payments_sql, p=Payment, ct=ct_course))}

    school_payments_sql = '''
    select {p.user}, max({p.created_at}) from {p} where {p}.polymorphic_ctype_id = {ct} group by {p.user}
    '''
    school_payments = {p[0]: p[1] for p in execute_sql(format_sql(school_payments_sql, p=Payment, ct=ct_school))}
    users = list(User.objects.filter(role=User.USER_ROLE))
    data = []
    for user in users:
        last_course_purchase = course_payments.get(user.id) and course_payments.get(user.id).strftime(date_format)
        last_school_purchase = school_payments.get(user.id) and school_payments.get(user.id).strftime(date_format)
        courses_purchased = CoursePayment.objects.filter(user=user,
                                   status__in=CoursePayment.PW_PAID_STATUSES).values_list('course_id', flat=True)
        data.append({
            'first_name': user.first_name,
            'last_name': user.last_name,
            'email': user.email,
            'last_login': user.last_login and user.last_login.strftime(date_format),
            'last_course_purchase': last_course_purchase,
            'last_school_purchase': last_school_purchase,
            # 'gender': {User.NOT_DEFINED: '', User.MALE: 'Мужчина', User.FEMALE: 'Женщина'}[user.gender] if user.gender else '',
            'birthday': user.birthday and user.birthday.strftime(date_format),
            'date_joined': user.date_joined.strftime(date_format),
            'courses_purchased': ','.join(map(str, courses_purchased)) + ',' if courses_purchased else '',
        })

    sg = get_sendgrid_client()
    response = sg.client.contactdb.recipients.patch(request_body=data)
    print(response.body)


@app.task
def send_gift_certificate(user_gift_certificate):
    user_gift_certificate = UserGiftCertificate.objects.get(id=user_gift_certificate)
    send_email('Подарочный сертификат от Lil School', user_gift_certificate.user.email, 'notification/email/gift_certificate.html',
               inline_images=[('twitter_icon', 'img/twitter.png'), ('fb_icon', 'img/fb.png'), ('instagram_icon', 'img/instagram.png'),],
               user_gift_certificate=user_gift_certificate, gift_certificate=user_gift_certificate.gift_certificate)