import base64
import logging
from datetime import datetime
from email.mime.image import MIMEImage

from django.core.exceptions import ValidationError
from django.core.mail import EmailMultiAlternatives
from django.conf import settings
from django.contrib import messages
from django.contrib.auth.decorators import permission_required, user_passes_test, login_required
from django.contrib.auth.mixins import PermissionRequiredMixin
from django.contrib.auth.models import User, Group
from django.contrib.sites.models import Site
from django.db import transaction
from django.db.models import F, Q
from django.db.models import Count, Max, Sum
from django.http import Http404
from django.http import HttpResponse, HttpResponseBadRequest
from django.shortcuts import redirect, render
from django.template import Template, Context
from django.urls import reverse
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import TemplateView

from registrasion import util
from registrasion.views import render_badge
from registrasion.models import commerce, people
from registrasion.templatetags.registrasion_tags import items_purchased, items_pending
from registrasion.templatetags.registrasion_tags import invoices, missing_categories
from symposion.conference.models import Conference

from regidesk import forms
from regidesk.models import BoardingPass, BoardingPassTemplate, CheckIn



AttendeeProfile = util.get_object_from_name(settings.ATTENDEE_PROFILE_MODEL)

def _staff_only(user):
    ''' Returns true if the user is staff. '''
    return user.is_staff

@login_required
def boardingpass(request):

    user=request.user
    checkin = CheckIn.objects.get_or_create(user=user)[0]
    if not checkin.boardingpass:
        templates = BoardingPassTemplate.objects.all()
        if not templates:
            messages.add_message(request, messages.WARNING,
                                 'Your boarding pass has not been prepared and I can\'t find a '
                                 'default template to use. This page has similar information to '
                                 'the boarding pass - please check back later.')
            return redirect('/tickets/review')
        prepare_boarding_pass(request.user, templates[0])
        checkin = CheckIn.objects.get_or_create(user=user)[0]

    boardingpass = checkin.boardingpass
    qrcode_url = request.build_absolute_uri(reverse("regidesk:checkin_png", args=[checkin.code]))
    qrcode = checkin.qrcode
    qrcode_string ='<img src="data:image/png;base64,' + qrcode + '"/>'
    not_qrcode_string = '<img src="cid:qrcode.png"/>'

    boardingpass_body = boardingpass.html_body.replace(not_qrcode_string, qrcode_string)
    ctx = { 'attendee': user.attendee,
            'boardingpass_body': boardingpass_body,
            'boardingpass': boardingpass
    }

    response = render(request, "regidesk/boardingpass.html", ctx)
    return response


@permission_required("regidesk.view_boarding_pass")
def boarding_overview(request, boarding_state="pending"):

    tickets = commerce.LineItem.objects.select_related(
        "invoice","invoice__user__attendee","product__category"
    ).filter(
        invoice__status=commerce.Invoice.STATUS_PAID,
        product__category=settings.TICKET_PRODUCT_CATEGORY,
        price__gte=0
    )

    print(datetime.now())
    ticketholders = ( ticket.invoice.user for ticket in tickets )
    print(datetime.now())

    attendees = people.Attendee.objects.select_related(
            "attendeeprofilebase",
            "attendeeprofilebase__attendeeprofile",
            "user",
            "user__checkin"
        ).filter(user__in=ticketholders)

    profiles = AttendeeProfile.objects.filter(
        attendee__in=attendees
    ).select_related(
        "attendee", "attendee__user",
    )
    profiles_by_attendee = dict((i.attendee, i) for i in profiles)

    bp_templates = BoardingPassTemplate.objects.all()

    ctx = {
        "boarding_state": boarding_state,
        "attendees": attendees,
        "profiles": profiles_by_attendee,
        "templates": bp_templates,
    }

    return render(request, "regidesk/boardingpass_overview.html", ctx)

def checkin_png(request, checkin_code):

    checkin = CheckIn.objects.get(checkin_code=checkin_code)
    if not checkin:
        raise Http404()

    response = HttpResponse()
    response["Content-Type"] = "image/png"
    response["Content-Disposition"] = 'inline; filename="qrcode.png"'

    qrcode = base64.b64decode(checkin.qrcode)
    response.write(qrcode)

    return response


def checkin_qrcode_url(code):
    """ Generate the QR code URL for the current site.
    eg. https://rego.linux.conf.au/checkin/<code>.png
    """

    # Cannot use build_absolute_uri as external URL is not known in docker
    # qrcode_url = request.build_absolute_uri(
    #     reverse("regidesk:checkin_png", args=[code]))

    current_site = Site.objects.get_current()
    qrcode_url = "https://{}{}".format(current_site,
        reverse("regidesk:checkin_png", args=[code]))
    return qrcode_url


@permission_required("regidesk.send_boarding_pass")
def boarding_prepare(request):

    attendee_pks = []
    try:
        for pk in request.POST.getlist("_selected_action"):
            attendee_pks.append(int(pk))
    except ValueError:
        messages.warning(request, ValueError)
        return redirect("/checkin/overview")
    attendees = people.Attendee.objects.filter(pk__in=attendee_pks)
    attendees = attendees.select_related(
        "user", "attendeeprofilebase", "attendeeprofilebase__attendeeprofile")

    try:
        sample_checkin = CheckIn.objects.get_or_create(user=attendees[0].user)[0]
    except:
        messages.warning(request, "Couldn't find a sample checking - did you add a user?")
        return redirect("/checkin/overview")

    rendered_template = {}
    sample_ctx = {}

    bp_template_pk = request.POST.get("template", "")
    if not bp_template_pk:
        messages.warning(request, "Need to choose a template")
        return redirect("/checkin/overview")

    bp_template = BoardingPassTemplate.objects.get(pk=bp_template_pk)
    if bp_template:
        sample_ctx = {
            "user": sample_checkin.user,
            "boardingpass": sample_checkin.boardingpass,
            "code": sample_checkin.code,
            "qrcode": '<img src="data:image/png;base64,' + sample_checkin.qrcode + '"/>',
            "qrcode_url": checkin_qrcode_url(sample_checkin.code),
        }
        ctx = Context(sample_ctx)
        ctx["invoices"] = invoices(ctx)
        ctx["items_pending"] = items_pending(ctx)
        ctx["items_purchased"] = items_purchased(ctx)
        ctx["missing_categories"] = missing_categories(ctx)

        subject = Template(bp_template.subject).render(ctx)
        rendered_template['plain'] = Template(bp_template.body).render(ctx)
        rendered_template['html'] = Template(bp_template.html_body).render(ctx)
        request.session['template'] = bp_template.pk
    else:
        subject = None
        request.session['template'] = None

    ctx = {
        "attendees": attendees,
        "template": bp_template,
        "attendee_pks": attendee_pks,
        "rendered_template": rendered_template,
        "subject": subject,
        "sample": sample_ctx,
    }

    request.session.set_expiry=(300)
    request.session['boarding_attendees'] = attendee_pks
    return render(request, "regidesk/boardingpass_prepare.html", ctx)

def prepare_boarding_pass(user, template, attendee=None):

    if attendee:
        user = attendee.user
    else:
        user = user
        attendee=user.attendee
    checkin = CheckIn.objects.get_or_create(user=user)
    ctx = {
        "user": user,
        "checkin": user.checkin,
        "code": user.checkin.code,
        "qrcode": user.checkin.qrcode,
        "qrcode_url": checkin_qrcode_url(user.checkin.code),
    }
    ctx = Context(ctx)
    ctx["invoices"] = invoices(ctx)
    ctx["items_pending"] = items_pending(ctx)
    ctx["items_purchased"] = items_purchased(ctx)
    ctx["missing_categories"] = missing_categories(ctx)

    subject = Template(template.subject).render(ctx)
    body = Template(template.body).render(ctx)
    if template.html_body:
        html_body = Template(template.html_body).render(ctx)
    else:
        html_body = None

    bpass = BoardingPass(template=template, to_address=user.email,
                         from_address=template.from_address,
                         subject=subject, body=body,
                         html_body=html_body
    )
    bpass.save()

    if user.checkin.boardingpass:
        user.checkin.boardingpass.delete()
    user.checkin.boardingpass = bpass
    user.checkin.save()

    return bpass

def send_boarding_pass(bpass, user):
    msg = EmailMultiAlternatives(
        bpass.subject,
        bpass.body,
        bpass.from_address,
        [bpass.to_address,],
    )
    msg.content_subtype="plain"
    msg.mixed_subtype="related"
    if bpass.html_body:
        msg.attach_alternative(bpass.html_body, "text/html")
        qrcode = base64.b64decode(user.checkin.qrcode)
        msg.attach(filename="qrcode.png", content=qrcode, mimetype="image/png")

    msg.send()
    bpass.sent = datetime.now()
    bpass.save()

@permission_required("regidesk.send_boarding_pass")
def boarding_send(request):

    BOARDING_GROUP = getattr(settings, "REGIDESK_BOARDING_GROUP", None)
    if BOARDING_GROUP and Group.objects.filter(name=BOARDING_GROUP):
        boarding_users = User.objects.filter(groups__name=BOARDING_GROUP)
    else:
        boarding_users = User.objects.all()

    attendees = people.Attendee.objects.filter(pk__in=request.session['boarding_attendees'])
    attendees = attendees.select_related(
                "user", "attendeeprofilebase", "attendeeprofilebase__attendeeprofile")

    logging.debug(len(attendees))
    logging.debug(attendees)

    template_pk = request.session['template']
    template = BoardingPassTemplate.objects.get(pk=template_pk)

    for attendee in attendees:
        try:
            user = attendee.user
            bpass = prepare_boarding_pass(user, template, attendee)
            if user in boarding_users:
                send_boarding_pass(bpass, user)
                messages.success(request, "Sent boarding pass to %s" % attendee)
        except Exception as err:
            logging.error("Error sending boarding pass for %s: %s", (attendee, err))
            messages.warning(request, "Could not send boarding pass to %s" % attendee)

        request.session['boarding_attendees'].remove(attendee.pk)

    return redirect("regidesk:boarding_overview")


class CheckInLanding(PermissionRequiredMixin, TemplateView):
    template_name = 'regidesk/ci_landing.html'
    permission_required = 'regidesk.view_boarding_pass'


@csrf_exempt
@permission_required("regidesk.view_boarding_pass")
def check_in_overview(request, access_code):
    check_in = CheckIn.objects.filter(
        checkin_code=access_code,
    )
    if not check_in:
        # yea it's a 200...
        return render(request, "regidesk/ci_code_404.html", {})
    check_in = check_in[0]
    if request.method == 'POST':
        if 'checkin' in request.POST:
            check_in.mark_checked_in()
        elif 'badge' in request.POST:
            check_in.mark_badge_printed()
        elif 'schwag' in request.POST:
            check_in.mark_schwag_given()
        elif 'bulk' in request.POST:
            check_in.bulk_mark_given()
        elif 'exception' in request.POST:
            check_in.set_exception(request.POST['exception'])
        elif 'unbadge' in request.POST:
            check_in.unset_badge()
        return redirect(request.path)
    ctx = {
        'check_in': check_in,
        'user': check_in.user,
    }
    return render(request, "regidesk/ci_overview.html", ctx)


@permission_required("regidesk.view_boarding_pass")
def checken_in_badge(request, access_code):
    check_in = CheckIn.objects.filter(
        checkin_code=access_code,
    )
    if not check_in:
        # yea it's a 200...
        return render(request, "regidesk/ci_code_404.html", {})
    badge = render_badge(check_in[0].user, format="svg", overlay=True)
    return badge

@login_required
def redir_main(request):
    if request.user.has_perm('regidesk.view_boarding_pass'):
        return redirect(reverse('regidesk:boarding_overview'))
    return redirect(reverse('regidesk:boardingpass'))