import os
import tempfile
import zipfile
from collections import OrderedDict
from datetime import date

from django import forms
from django.contrib import admin
from django.core.mail import EmailMessage
from django.db.models import BooleanField
from django.http import HttpResponse
from django.template import loader
from django.urls import reverse

from stages.exports import OpenXMLExport
from .forms import CandidateForm
from .models import Candidate, Interview, GENDER_CHOICES
from .pdf import InscriptionSummaryPDF


def export_candidates(modeladmin, request, queryset):
    """
    Export all candidates fields.
    """
    export_fields = OrderedDict(
        [(f.verbose_name, f.name) for f in Candidate._meta.get_fields() if f.name != 'ID']
    )
    boolean_fields = [f.name for f in Candidate._meta.get_fields() if isinstance(f, BooleanField)]
    export_fields['Employeur'] = 'corporation__name'
    export_fields['Employeur_localite'] = 'corporation__city'
    export_fields['FEE/FPP'] = 'instructor__last_name'

    export = OpenXMLExport('Exportation')
    export.write_line(export_fields.keys(), bold=True)
    for cand in queryset.values_list(*export_fields.values()):
        values = []
        for value, field_name in zip(cand, export_fields.values()):
            if field_name == 'gender':
                value = dict(GENDER_CHOICES)[value]
            if field_name in boolean_fields:
                value = 'Oui' if value else ''
            values.append(value)
        export.write_line(values)
    return export.get_http_response('candidats_export')

export_candidates.short_description = "Exporter les candidats sélectionnés"


def send_confirmation_mail(modeladmin, request, queryset):
    from_email = request.user.email
    subject = "Confirmation de votre inscription à l'Ecole Santé-social Pierre-Coullery"
    email_sent = 0

    for candidate in queryset.filter(
            deposite_date__isnull=False, date_confirmation_mail__isnull=True, canceled_file=False):
        to = [candidate.email]

        if candidate.corporation and candidate.corporation.email:
            to.append(candidate.corporation.email)
        if candidate.instructor and candidate.instructor.email:
            to.append(candidate.instructor.email)

        context = {
            'candidate_civility': candidate.civility,
            'candidate_name': " ".join([candidate.civility, candidate.first_name, candidate.last_name]),
            'section': candidate.section,
            'sender_name': " ".join([request.user.first_name, request.user.last_name]),
            'sender_email': from_email,
        }

        if candidate.section == 'EDE':
            body = loader.render_to_string('email/candidate_confirm_EDE.txt', context)
        else:
            body = loader.render_to_string('email/candidate_confirm_FE.txt', context)

        email = EmailMessage(
            subject=subject,
            body=body,
            from_email=from_email,
            to=to,
            bcc=[from_email]
        )

        try:
            email.send()
            email_sent += 1
        except Exception as err:
            modeladmin.message_user(request, "Échec d’envoi pour le candidat {0} ({1})".format(candidate, err))
        else:
            candidate.date_confirmation_mail = date.today()
            candidate.save()
        modeladmin.message_user(request, "%d messages de confirmation ont été envoyés." % email_sent)
send_confirmation_mail.short_description = "Envoyer email de confirmation"


def print_summary(modeladmin, request, queryset):
    """
    Print a summary of inscription
    """
    filename = 'archive_InscriptionResumes.zip'
    path = os.path.join(tempfile.gettempdir(), filename)

    with zipfile.ZipFile(path, mode='w', compression=zipfile.ZIP_DEFLATED) as filezip:
        for candidate in queryset:
            pdf = InscriptionSummaryPDF(candidate)
            pdf.produce(candidate)
            filezip.write(pdf.filename)

    with open(filezip.filename, mode='rb') as fh:
        response = HttpResponse(fh.read(), content_type='application/zip')
        response['Content-Disposition'] = 'attachment; filename="{0}"'.format(filename)
    return response
print_summary.short_description = 'Imprimer résumé'


class CandidateAdmin(admin.ModelAdmin):
    form = CandidateForm
    list_display = ('last_name', 'first_name', 'section', 'confirm_mail', 'convocation')
    list_filter = ('section', 'option')
    readonly_fields = ('total_result_points', 'total_result_mark', 'confirmation_date')
    actions = [export_candidates, send_confirmation_mail, print_summary]
    fieldsets = (
        (None, {
            'fields': (('first_name', 'last_name', 'gender'),
                       ('street', 'pcode', 'city', 'district'),
                       ('mobile', 'email'),
                       ('birth_date', 'avs', 'handicap', 'has_photo'),
                       ('section', 'option'),
                       ('corporation', 'instructor'),
                       ('deposite_date', 'confirmation_date', 'canceled_file'),
                       'comment',
                      ),
        }),
        ("FE", {
            'classes': ('collapse',),
            'fields': (('exemption_ecg', 'integration_second_year', 'validation_sfpo'),),
        }),
        ("EDE/EDS", {
            'classes': ('collapse',),
            'fields': (('diploma', 'diploma_detail', 'diploma_status'),
                        ('registration_form', 'certificate_of_payement', 'cv', 'police_record', 'reflexive_text',
                        'marks_certificate', 'residence_permits', 'aes_accords'),
                        ('certif_of_800_childhood', 'certif_of_800_general', 'work_certificate'),
                        ('promise', 'contract', 'activity_rate'),
                        ('interview',),
                        ('examination_result', 'interview_result', 'file_result', 'total_result_points',
                            'total_result_mark')
            ),
        }),
    )

    def confirm_mail(self, obj):
        return obj.confirmation_date is not None
    confirm_mail.boolean = True

    def convocation(self, obj):
        if obj.interview is None:
            return '???'
        elif obj.interview and obj.convocation_date:
            return obj.interview
        else:
            url = reverse('candidate-convocation', args=[obj.pk])
            return '<a href="' + url  + '">Envoyer convocation</a>'
    convocation.short_description = 'Convoc. aux examens'
    convocation.allow_tags = True


class InterviewAdmin(admin.ModelAdmin):
    pass


admin.site.register(Candidate, CandidateAdmin)
admin.site.register(Interview, InterviewAdmin)