from django.apps import apps
from django.contrib import admin
from django.shortcuts import HttpResponse
from django.contrib.admin.sites import AlreadyRegistered
from .models import Announcement, Edition, School, Student
from django.db import transaction

from io import BytesIO
import xlsxwriter


class EditionModelAdmin(admin.ModelAdmin):
    list_display = ('__str__', 'active')
    ordering = ('-active', '-year')

    change_form_template = 'admin/edition_buttons.html'

    def response_change(self, request, obj):
        if '_update-student-scores' in request.POST:
            file = obj.scores.open(mode='r')
            content = filter(lambda x: x != '', file.read().split('\n'))
            file.close()

            rows = [x.split(',') for x in content]

            with transaction.atomic():
                for index, row in enumerate(rows):
                    if index == 0:
                        continue

                    Student.objects.filter(identifier=row[0]).update(
                        score_first=row[1], score_second=row[2])

        if '_update-disable-submissions' in request.POST and obj.active and obj.submissions:
            if obj.active is True:
                schools = School.objects.all()

                with transaction.atomic():
                    for school in schools:
                        school.updateTeam()

                    obj.submissions = False
                    obj.save()

        if '_generate-student-list' in request.POST:
            year = obj.year
            students = Student.objects.filter(identifier__startswith=year)
            schools_set = {int(student.identifier.split('-')
                               [1]) for student in students}

            output = BytesIO()
            workbook = xlsxwriter.Workbook(output)

            worksheet = workbook.add_worksheet("Lista uczniów")

            worksheet.write(0, 0, 'Identyfikator')
            worksheet.write(0, 1, 'Wynik - eliminacje')
            worksheet.write(0, 2, 'Wynik - finał')
            worksheet.write(0, 3, 'Imię')
            worksheet.write(0, 4, 'Nazwisko')
            worksheet.write(0, 5, 'Klasa')
            worksheet.write(0, 6, 'Szkoła - nazwa')
            worksheet.write(0, 7, 'Szkoła - miejscowość')
            worksheet.write(0, 8, 'Szkoła - adres')

            row = 1
            for school_id in schools_set:
                for student in sorted(Student.objects.filter(identifier__startswith=f'{year}-{school_id}-'), key=lambda x: x.identifier.split('-')[2]):
                    # Identyfikator
                    worksheet.write(row, 0, student.identifier)
                    # Wynik - eliminacje
                    worksheet.write(row, 1, student.score_first)
                    # Wynik - finał
                    worksheet.write(row, 2, student.score_second)
                    worksheet.write(row, 3, student.name)  # Imię
                    worksheet.write(row, 4, student.surname)  # Nazwisko
                    worksheet.write(row, 5, student.grade)  # Klasa
                    # Szkoła - nazwa
                    worksheet.write(row, 6, student.school_name)
                    # Szkoła - miejscowość
                    worksheet.write(row, 7, student.school_town)
                    # Szkoła - adres
                    worksheet.write(row, 8, student.school_address)

                    row += 1

            workbook.close()
            xlsx_data = output.getvalue()

            response = HttpResponse(content_type='application/vnd.ms-excel')
            response['Content-Disposition'] = 'attachment; filename=Uczniowie.xlsx'
            response.write(xlsx_data)

            return response

        return super().response_change(request, obj)


class StudentYearFilter(admin.SimpleListFilter):
    title = 'aktualna edycja'
    parameter_name = 'aktualna edycja'

    def lookups(self, request, model_admin):
        return (
            ('Yes', 'Jedynie aktualna edycja'),
        )

    def queryset(self, request, queryset):
        value = self.value()
        year = Edition.current().year

        if value == 'Yes':
            return queryset.filter(identifier__startswith=str(year))

        return queryset


class StudentModelAdmin(admin.ModelAdmin):
    list_display = ('identifier', '__str__', 'grade')
    search_fields = ('identifier', 'name', 'surname', 'grade')
    ordering = ('-identifier',)
    list_filter = (StudentYearFilter,)


class SchoolYearFilter(admin.SimpleListFilter):
    title = 'aktualna edycja'
    parameter_name = 'aktualna edycja'

    def lookups(self, request, model_admin):
        return (
            ('Yes', 'Jedynie aktualna edycja'),
        )

    def queryset(self, request, queryset):
        value = self.value()
        year = Edition.current().year

        if value == 'Yes':
            return queryset.filter(identifier__startswith=str(year))

        return queryset


@admin.register(School)
class SchoolAdmin(admin.ModelAdmin):
    list_display = ('view_name', 'in_current', 'email', 'phone')

    @admin.display(empty_value='-')
    def view_name(self, obj):
        return obj.name or '-'


admin.site.register(Student, StudentModelAdmin)
admin.site.register(Edition, EditionModelAdmin)


app_models = apps.get_app_config('app').get_models()
for model in app_models:
    try:
        admin.site.register(model)
    except AlreadyRegistered:
        pass

admin.site.site_header = 'Puchar Dyrektora LO V'
admin.site.site_title = 'Puchar LO V'
admin.site.index_title = 'Panel administracyjny'
admin.site.site_url = '/'
admin.site.enable_nav_sidebar = False