import csv
import datetime
import pytils
import weasyprint
from decimal import Decimal

from django.conf import settings
from django.contrib import admin
from django.utils.translation import ugettext_lazy as _
from django.http import HttpResponse
from django.template.loader import render_to_string

from jet.admin import CompactInline
from jet.filters import DateRangeFilter
from rangefilter.filter import DateTimeRangeFilter

from core.admin import SafeModelAdmin
from core.models import Certificate
from eshop_project.settings.base import PAY_REQUISITES
from .models import (
    Offer, SupplyType,
    Currency, Buying,
    SupplyTarget,
    Order, Discount,
    Client)


class ProductOfferInlineAdmin(CompactInline):
    model = Offer
    exclude = ('status',)
    extra = 1
    show_change_link = 1
    max_num = 1

# Supply admins

@admin.register(SupplyType)
class SupplyTypeAdmin(admin.ModelAdmin):
    list_display = ('name', 'min_term', 'max_term')
    search_fields = ('name', 'min_term', 'max_term')


@admin.register(SupplyTarget)
class SupplyTargetAdmin(admin.ModelAdmin):
    list_display = ('name', 'slug')
    search_fields = ('name', 'slug',)


@admin.register(Discount)
class DiscountAdmin(admin.ModelAdmin):
    list_display = ['code', 'valid_from', 'valid_to', 'value', 'active']
    list_filter  = ['valid_from', 'valid_to', 'active']
    search_field = ['code']


# Offer admins
@admin.register(Offer)
class ProductOfferAdmin(SafeModelAdmin):
    list_display = ('product', 'price', 'amount', 'currency')
    search_fields = ('product__name',)
    list_filter = ('currency',)


@admin.register(Buying)
class BuyingAdmin(SafeModelAdmin):
    def export_buyings_to_csv(self, buying, queryset):
        opts = buying._meta
        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = 'attachment; filename=Orders-{}.csv'.format(
            datetime.datetime.now().strftime("%d/%m/%Y"))
        writer = csv.writer(response)

        fields = [field for field in opts.get_fields() if not field.many_to_many and not field.one_to_many]

        writer.writerow([field.verbose_name for field in fields])

        for obj in queryset:
            data_row = []
            for field in fields:
                value = getattr(obj, field.name)
                if isinstance(value, datetime.datetime):
                    value = value.strftime('%d/%m/%Y')

                data_row.append(value)
            writer.writerow(data_row)
        return response
    export_buyings_to_csv.short_description = _('экспортировать CSV')

    def print_order_in_pdf(self,buyings):
        verb_price = pytils.numeral.in_words(round(buyings.total_price))
        verb_cur = pytils.numeral.choose_plural(round(buyings.total_price), ("рубль", "рубля", "рублей"))
        html = render_to_string('bootstrap/pdf/buyings.html', {
            **PAY_REQUISITES, 'order': buyings, 'verb_cur': verb_cur, 'verb_price': verb_price
        })
        rendered_html = html.encode(encoding="UTF-8")
        response = HttpResponse(content_type='application/pdf')
        response['Content-Disposition'] = 'filename=order_{}.pdf'.format(buyings.id)


        weasyprint.HTML(
            string=rendered_html,
            base_url=self.request.build_absolute_uri()
        ).write_pdf(
            response,
            stylesheets = [
                weasyprint.CSS(settings.STATIC_ROOT + '/css/bootstrap.min.css')
            ]
        )
        return response
    print_order_in_pdf.short_description = _('Распечатать заказ в pdf')

    def mark_buyings_as_paid(self, request, queryset):
        for buying in queryset:
            user_profile = buying.user.profile
            if user_profile.parent:
                parent_profile = user_profile.parent.profile
                parent_profile.user_points += round(buying.total_price * Decimal(0.01))
                parent_profile.save()
            buying.status = BUYING_STATUS_PAID
            buying.save()
    mark_buyings_as_paid.short_description = _('Отметить как оплаченные')


    inlines = ()
    list_display = ('user', 'offer', 'status', 'amount', 'total_price')
    search_fields = ('user', 'offer',)
    list_filter = (
        ('create_at', DateRangeFilter), ('updated_at', DateTimeRangeFilter)
    )

    actions = (export_buyings_to_csv, print_order_in_pdf, mark_buyings_as_paid)


@admin.register(Order)
class OrderAdmin(SafeModelAdmin):
    list_display = ('order_code', 'customer_user', 'customer_name', 'customer_email','phone')


@admin.register(Client)
class ClientAdmin(SafeModelAdmin):
    list_display = ('name','image','status',)
    search_fields = ('name',)
    list_filter = ('status',)