import logging
from collections import defaultdict
from decimal import Decimal
from io import BytesIO
from typing import Tuple

import bleach
import vat_moss.exchange_rates
from django.contrib.staticfiles import finders
from django.dispatch import receiver
from django.utils.formats import date_format, localize
from django.utils.translation import (
    get_language, pgettext, ugettext, ugettext_lazy,
)
from PIL.Image import BICUBIC
from reportlab.lib import pagesizes
from reportlab.lib.enums import TA_LEFT, TA_RIGHT
from reportlab.lib.styles import ParagraphStyle, StyleSheet1
from reportlab.lib.units import mm
from reportlab.lib.utils import ImageReader
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.pdfmetrics import stringWidth
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfgen.canvas import Canvas
from reportlab.platypus import (
    BaseDocTemplate, Frame, KeepTogether, NextPageTemplate, PageTemplate,
    Paragraph, Spacer, Table, TableStyle,
)

from pretix.base.decimal import round_decimal
from pretix.base.models import Event, Invoice
from pretix.base.signals import register_invoice_renderers
from pretix.base.templatetags.money import money_filter

logger = logging.getLogger(__name__)


class NumberedCanvas(Canvas):
    def __init__(self, *args, **kwargs):
        self.font_regular = kwargs.pop('font_regular')
        super().__init__(*args, **kwargs)
        self._saved_page_states = []

    def showPage(self):
        self._saved_page_states.append(dict(self.__dict__))
        self._startPage()

    def save(self):
        num_pages = len(self._saved_page_states)
        for state in self._saved_page_states:
            self.__dict__.update(state)
            self.draw_page_number(num_pages)
            Canvas.showPage(self)
        Canvas.save(self)

    def draw_page_number(self, page_count):
        self.saveState()
        self.setFont(self.font_regular, 8)
        self.drawRightString(self._pagesize[0] - 20 * mm, 10 * mm, pgettext("invoice", "Page %d of %d") % (self._pageNumber, page_count,))
        self.restoreState()


class BaseInvoiceRenderer:
    """
    This is the base class for all invoice renderers.
    """

    def __init__(self, event: Event):
        self.event = event

    def __str__(self):
        return self.identifier

    def generate(self, invoice: Invoice) -> Tuple[str, str, str]:
        """
        This method should generate the invoice file and return a tuple consisting of a
        filename, a file type and file content. The extension will be taken from the filename
        which is otherwise ignored.
        """
        raise NotImplementedError()

    @property
    def verbose_name(self) -> str:
        """
        A human-readable name for this renderer. This should be short but
        self-explanatory. Good examples include 'German DIN 5008' or 'Italian invoice'.
        """
        raise NotImplementedError()  # NOQA

    @property
    def identifier(self) -> str:
        """
        A short and unique identifier for this renderer.
        This should only contain lowercase letters and in most
        cases will be the same as your package name.
        """
        raise NotImplementedError()  # NOQA


class BaseReportlabInvoiceRenderer(BaseInvoiceRenderer):
    """
    This is a convenience class to avoid duplicate code when implementing invoice renderers
    that are based on reportlab.
    """
    pagesize = pagesizes.A4
    left_margin = 25 * mm
    right_margin = 20 * mm
    top_margin = 20 * mm
    bottom_margin = 15 * mm
    doc_template_class = BaseDocTemplate
    canvas_class = Canvas
    font_regular = 'OpenSans'
    font_bold = 'OpenSansBd'

    def _init(self):
        """
        Initialize the renderer. By default, this registers fonts and sets ``self.stylesheet``.
        """
        self.stylesheet = self._get_stylesheet()
        self._register_fonts()

    def _get_stylesheet(self):
        """
        Get a stylesheet. By default, this contains the "Normal" and "Heading1" styles.
        """
        stylesheet = StyleSheet1()
        stylesheet.add(ParagraphStyle(name='Normal', fontName=self.font_regular, fontSize=10, leading=12))
        stylesheet.add(ParagraphStyle(name='InvoiceFrom', parent=stylesheet['Normal']))
        stylesheet.add(ParagraphStyle(name='Heading1', fontName=self.font_bold, fontSize=15, leading=15 * 1.2))
        stylesheet.add(ParagraphStyle(name='FineprintHeading', fontName=self.font_bold, fontSize=8, leading=12))
        stylesheet.add(ParagraphStyle(name='Fineprint', fontName=self.font_regular, fontSize=8, leading=10))
        return stylesheet

    def _register_fonts(self):
        """
        Register fonts with reportlab. By default, this registers the OpenSans font family
        """
        pdfmetrics.registerFont(TTFont('OpenSans', finders.find('fonts/OpenSans-Regular.ttf')))
        pdfmetrics.registerFont(TTFont('OpenSansIt', finders.find('fonts/OpenSans-Italic.ttf')))
        pdfmetrics.registerFont(TTFont('OpenSansBd', finders.find('fonts/OpenSans-Bold.ttf')))
        pdfmetrics.registerFont(TTFont('OpenSansBI', finders.find('fonts/OpenSans-BoldItalic.ttf')))
        pdfmetrics.registerFontFamily('OpenSans', normal='OpenSans', bold='OpenSansBd',
                                      italic='OpenSansIt', boldItalic='OpenSansBI')

    def _upper(self, val):
        # We uppercase labels, but not in every language
        if get_language() == 'el':
            return val
        return val.upper()

    def _on_other_page(self, canvas: Canvas, doc):
        """
        Called when a new page is rendered that is *not* the first page.
        """
        pass

    def _on_first_page(self, canvas: Canvas, doc):
        """
        Called when a new page is rendered that is the first page.
        """
        pass

    def _get_story(self, doc):
        """
        Called to create the story to be inserted into the main frames.
        """
        raise NotImplementedError()

    def _get_first_page_frames(self, doc):
        """
        Called to create a list of frames for the first page.
        """
        return [
            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height - 75 * mm,
                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=0,
                  id='normal')
        ]

    def _get_other_page_frames(self, doc):
        """
        Called to create a list of frames for the other pages.
        """
        return [
            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height,
                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=0,
                  id='normal')
        ]

    def _build_doc(self, fhandle):
        """
        Build a PDF document in a given file handle
        """
        self._init()
        doc = self.doc_template_class(fhandle, pagesize=self.pagesize,
                                      leftMargin=self.left_margin, rightMargin=self.right_margin,
                                      topMargin=self.top_margin, bottomMargin=self.bottom_margin)

        doc.addPageTemplates([
            PageTemplate(
                id='FirstPage',
                frames=self._get_first_page_frames(doc),
                onPage=self._on_first_page,
                pagesize=self.pagesize
            ),
            PageTemplate(
                id='OtherPages',
                frames=self._get_other_page_frames(doc),
                onPage=self._on_other_page,
                pagesize=self.pagesize
            )
        ])
        story = self._get_story(doc)
        doc.build(story, canvasmaker=self.canvas_class)
        return doc

    def generate(self, invoice: Invoice):
        self.invoice = invoice
        buffer = BytesIO()
        self._build_doc(buffer)
        buffer.seek(0)
        return 'invoice.pdf', 'application/pdf', buffer.read()


class ThumbnailingImageReader(ImageReader):
    def resize(self, width, height, dpi):
        if width is None:
            width = height * self._image.size[0] / self._image.size[1]
        if height is None:
            height = width * self._image.size[1] / self._image.size[0]
        self._image.thumbnail(
            size=(int(width * dpi / 72), int(height * dpi / 72)),
            resample=BICUBIC
        )
        self._data = None
        return width, height

    def _jpeg_fh(self):
        # Bypass a reportlab-internal optimization that falls back to the original
        # file handle if the file is a JPEG, and therefore does not respect the
        # (smaller) size of the modified image.
        return None


class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
    identifier = 'classic'
    verbose_name = pgettext('invoice', 'Classic renderer (pretix 1.0)')

    def canvas_class(self, *args, **kwargs):
        kwargs['font_regular'] = self.font_regular
        return NumberedCanvas(*args, **kwargs)

    def _on_other_page(self, canvas: Canvas, doc):
        canvas.saveState()
        canvas.setFont(self.font_regular, 8)

        for i, line in enumerate(self.invoice.footer_text.split('\n')[::-1]):
            canvas.drawCentredString(self.pagesize[0] / 2, 25 + (3.5 * i) * mm, line.strip())

        canvas.restoreState()

    invoice_to_width = 85 * mm
    invoice_to_height = 50 * mm
    invoice_to_left = 25 * mm
    invoice_to_top = 52 * mm

    def _draw_invoice_to(self, canvas):
        p = Paragraph(self.invoice.address_invoice_to.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
        p.wrapOn(canvas, self.invoice_to_width, self.invoice_to_height)
        p_size = p.wrap(self.invoice_to_width, self.invoice_to_height)
        p.drawOn(canvas, self.invoice_to_left, self.pagesize[1] - p_size[1] - self.invoice_to_top)

    invoice_from_width = 70 * mm
    invoice_from_height = 50 * mm
    invoice_from_left = 25 * mm
    invoice_from_top = 17 * mm

    def _draw_invoice_from(self, canvas):
        p = Paragraph(self.invoice.full_invoice_from.strip().replace('\n', '<br />\n'), style=self.stylesheet[
            'InvoiceFrom'])
        p.wrapOn(canvas, self.invoice_from_width, self.invoice_from_height)
        p_size = p.wrap(self.invoice_from_width, self.invoice_from_height)
        p.drawOn(canvas, self.invoice_from_left, self.pagesize[1] - p_size[1] - self.invoice_from_top)

    def _draw_invoice_from_label(self, canvas):
        textobject = canvas.beginText(25 * mm, (297 - 15) * mm)
        textobject.setFont(self.font_bold, 8)
        textobject.textLine(self._upper(pgettext('invoice', 'Invoice from')))
        canvas.drawText(textobject)

    def _draw_invoice_to_label(self, canvas):
        textobject = canvas.beginText(25 * mm, (297 - 50) * mm)
        textobject.setFont(self.font_bold, 8)
        textobject.textLine(self._upper(pgettext('invoice', 'Invoice to')))
        canvas.drawText(textobject)

    logo_width = 25 * mm
    logo_height = 25 * mm
    logo_left = 95 * mm
    logo_top = 13 * mm
    logo_anchor = 'n'

    def _draw_logo(self, canvas):
        if self.invoice.event.settings.invoice_logo_image:
            logo_file = self.invoice.event.settings.get('invoice_logo_image', binary_file=True)
            ir = ThumbnailingImageReader(logo_file)
            try:
                ir.resize(self.logo_width, self.logo_height, 300)
            except:
                logger.exception("Can not resize image")
                pass
            canvas.drawImage(ir,
                             self.logo_left,
                             self.pagesize[1] - self.logo_height - self.logo_top,
                             width=self.logo_width, height=self.logo_height,
                             preserveAspectRatio=True, anchor=self.logo_anchor,
                             mask='auto')

    def _draw_metadata(self, canvas):
        textobject = canvas.beginText(125 * mm, (297 - 38) * mm)
        textobject.setFont(self.font_bold, 8)
        textobject.textLine(self._upper(pgettext('invoice', 'Order code')))
        textobject.moveCursor(0, 5)
        textobject.setFont(self.font_regular, 10)
        textobject.textLine(self.invoice.order.full_code)
        canvas.drawText(textobject)

        textobject = canvas.beginText(125 * mm, (297 - 50) * mm)
        textobject.setFont(self.font_bold, 8)
        if self.invoice.is_cancellation:
            textobject.textLine(self._upper(pgettext('invoice', 'Cancellation number')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.number)
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_bold, 8)
            textobject.textLine(self._upper(pgettext('invoice', 'Original invoice')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.refers.number)
        else:
            textobject.textLine(self._upper(pgettext('invoice', 'Invoice number')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.number)
        textobject.moveCursor(0, 5)

        if self.invoice.is_cancellation:
            textobject.setFont(self.font_bold, 8)
            textobject.textLine(self._upper(pgettext('invoice', 'Cancellation date')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(date_format(self.invoice.date, "DATE_FORMAT"))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_bold, 8)
            textobject.textLine(self._upper(pgettext('invoice', 'Original invoice date')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(date_format(self.invoice.refers.date, "DATE_FORMAT"))
            textobject.moveCursor(0, 5)
        else:
            textobject.setFont(self.font_bold, 8)
            textobject.textLine(self._upper(pgettext('invoice', 'Invoice date')))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(date_format(self.invoice.date, "DATE_FORMAT"))
            textobject.moveCursor(0, 5)

        canvas.drawText(textobject)

    event_left = 125 * mm
    event_top = 17 * mm
    event_width = 65 * mm
    event_height = 50 * mm

    def _draw_event_label(self, canvas):
        textobject = canvas.beginText(125 * mm, (297 - 15) * mm)
        textobject.setFont(self.font_bold, 8)
        textobject.textLine(self._upper(pgettext('invoice', 'Event')))
        canvas.drawText(textobject)

    def _draw_event(self, canvas):
        def shorten(txt):
            txt = str(txt)
            p = Paragraph(txt.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
            p_size = p.wrap(self.event_width, self.event_height)

            while p_size[1] > 2 * self.stylesheet['Normal'].leading:
                txt = ' '.join(txt.replace('…', '').split()[:-1]) + '…'
                p = Paragraph(txt.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
                p_size = p.wrap(self.event_width, self.event_height)
            return txt

        if not self.invoice.event.has_subevents:
            if self.invoice.event.settings.show_date_to and self.invoice.event.date_to:
                p_str = (
                    shorten(self.invoice.event.name) + '\n' +
                    pgettext('invoice', '{from_date}\nuntil {to_date}').format(
                        from_date=self.invoice.event.get_date_from_display(),
                        to_date=self.invoice.event.get_date_to_display()
                    )
                )
            else:
                p_str = (
                    shorten(self.invoice.event.name) + '\n' + self.invoice.event.get_date_from_display()
                )
        else:
            p_str = shorten(self.invoice.event.name)

        p = Paragraph(p_str.strip().replace('\n', '<br />\n'), style=self.stylesheet['Normal'])
        p.wrapOn(canvas, self.event_width, self.event_height)
        p_size = p.wrap(self.event_width, self.event_height)
        p.drawOn(canvas, self.event_left, self.pagesize[1] - self.event_top - p_size[1])
        self._draw_event_label(canvas)

    def _draw_footer(self, canvas):
        canvas.setFont(self.font_regular, 8)
        for i, line in enumerate(self.invoice.footer_text.split('\n')[::-1]):
            canvas.drawCentredString(self.pagesize[0] / 2, 25 + (3.5 * i) * mm, line.strip())

    def _draw_testmode(self, canvas):
        if self.invoice.order.testmode:
            canvas.saveState()
            canvas.setFont('OpenSansBd', 30)
            canvas.setFillColorRGB(32, 0, 0)
            canvas.drawRightString(self.pagesize[0] - 20 * mm, (297 - 100) * mm, ugettext('TEST MODE'))
            canvas.restoreState()

    def _on_first_page(self, canvas: Canvas, doc):
        canvas.setCreator('pretix.eu')
        canvas.setTitle(pgettext('invoice', 'Invoice {num}').format(num=self.invoice.number))

        canvas.saveState()
        self._draw_footer(canvas)
        self._draw_testmode(canvas)
        self._draw_invoice_from_label(canvas)
        self._draw_invoice_from(canvas)
        self._draw_invoice_to_label(canvas)
        self._draw_invoice_to(canvas)
        self._draw_metadata(canvas)
        self._draw_logo(canvas)
        self._draw_event(canvas)
        canvas.restoreState()

    def _get_first_page_frames(self, doc):
        footer_length = 3.5 * len(self.invoice.footer_text.split('\n')) * mm
        return [
            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height - 75 * mm,
                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=footer_length,
                  id='normal')
        ]

    def _get_other_page_frames(self, doc):
        footer_length = 3.5 * len(self.invoice.footer_text.split('\n')) * mm
        return [
            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height,
                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=footer_length,
                  id='normal')
        ]

    def _get_story(self, doc):
        has_taxes = any(il.tax_value for il in self.invoice.lines.all())

        story = [
            NextPageTemplate('FirstPage'),
            Paragraph(pgettext('invoice', 'Invoice')
                      if not self.invoice.is_cancellation
                      else pgettext('invoice', 'Cancellation'),
                      self.stylesheet['Heading1']),
            Spacer(1, 5 * mm),
            NextPageTemplate('OtherPages'),
        ]

        if self.invoice.internal_reference:
            story.append(Paragraph(
                pgettext('invoice', 'Customer reference: {reference}').format(reference=self.invoice.internal_reference),
                self.stylesheet['Normal']
            ))

        if self.invoice.invoice_to_vat_id:
            story.append(Paragraph(
                pgettext('invoice', 'Customer VAT ID') + ':<br />' +
                bleach.clean(self.invoice.invoice_to_vat_id, tags=[]).replace("\n", "<br />\n"),
                self.stylesheet['Normal']
            ))

        if self.invoice.invoice_to_beneficiary:
            story.append(Paragraph(
                pgettext('invoice', 'Beneficiary') + ':<br />' +
                bleach.clean(self.invoice.invoice_to_beneficiary, tags=[]).replace("\n", "<br />\n"),
                self.stylesheet['Normal']
            ))

        if self.invoice.introductory_text:
            story.append(Paragraph(self.invoice.introductory_text, self.stylesheet['Normal']))
            story.append(Spacer(1, 10 * mm))

        taxvalue_map = defaultdict(Decimal)
        grossvalue_map = defaultdict(Decimal)

        tstyledata = [
            ('ALIGN', (1, 0), (-1, -1), 'RIGHT'),
            ('VALIGN', (0, 0), (-1, -1), 'TOP'),
            ('FONTNAME', (0, 0), (-1, 0), self.font_bold),
            ('FONTNAME', (0, -1), (-1, -1), self.font_bold),
            ('LEFTPADDING', (0, 0), (0, -1), 0),
            ('RIGHTPADDING', (-1, 0), (-1, -1), 0),
        ]
        if has_taxes:
            tdata = [(
                pgettext('invoice', 'Description'),
                pgettext('invoice', 'Qty'),
                pgettext('invoice', 'Tax rate'),
                pgettext('invoice', 'Net'),
                pgettext('invoice', 'Gross'),
            )]
        else:
            tdata = [(
                pgettext('invoice', 'Description'),
                pgettext('invoice', 'Qty'),
                pgettext('invoice', 'Amount'),
            )]

        total = Decimal('0.00')
        for line in self.invoice.lines.all():
            if has_taxes:
                tdata.append((
                    Paragraph(line.description, self.stylesheet['Normal']),
                    "1",
                    localize(line.tax_rate) + " %",
                    money_filter(line.net_value, self.invoice.event.currency),
                    money_filter(line.gross_value, self.invoice.event.currency),
                ))
            else:
                tdata.append((
                    Paragraph(line.description, self.stylesheet['Normal']),
                    "1",
                    money_filter(line.gross_value, self.invoice.event.currency),
                ))
            taxvalue_map[line.tax_rate, line.tax_name] += line.tax_value
            grossvalue_map[line.tax_rate, line.tax_name] += line.gross_value
            total += line.gross_value

        if has_taxes:
            tdata.append([
                pgettext('invoice', 'Invoice total'), '', '', '', money_filter(total, self.invoice.event.currency)
            ])
            colwidths = [a * doc.width for a in (.50, .05, .15, .15, .15)]
        else:
            tdata.append([
                pgettext('invoice', 'Invoice total'), '', money_filter(total, self.invoice.event.currency)
            ])
            colwidths = [a * doc.width for a in (.65, .05, .30)]

        table = Table(tdata, colWidths=colwidths, repeatRows=1)
        table.setStyle(TableStyle(tstyledata))
        story.append(table)

        story.append(Spacer(1, 15 * mm))

        if self.invoice.payment_provider_text:
            story.append(Paragraph(self.invoice.payment_provider_text, self.stylesheet['Normal']))

        if self.invoice.additional_text:
            story.append(Paragraph(self.invoice.additional_text, self.stylesheet['Normal']))
            story.append(Spacer(1, 15 * mm))

        tstyledata = [
            ('ALIGN', (1, 0), (-1, -1), 'RIGHT'),
            ('LEFTPADDING', (0, 0), (0, -1), 0),
            ('RIGHTPADDING', (-1, 0), (-1, -1), 0),
            ('FONTSIZE', (0, 0), (-1, -1), 8),
            ('FONTNAME', (0, 0), (-1, -1), self.font_regular),
        ]
        thead = [
            pgettext('invoice', 'Tax rate'),
            pgettext('invoice', 'Net value'),
            pgettext('invoice', 'Gross value'),
            pgettext('invoice', 'Tax'),
            ''
        ]
        tdata = [thead]

        for idx, gross in grossvalue_map.items():
            rate, name = idx
            if rate == 0:
                continue
            tax = taxvalue_map[idx]
            tdata.append([
                localize(rate) + " % " + name,
                money_filter(gross - tax, self.invoice.event.currency),
                money_filter(gross, self.invoice.event.currency),
                money_filter(tax, self.invoice.event.currency),
                ''
            ])

        def fmt(val):
            try:
                return vat_moss.exchange_rates.format(val, self.invoice.foreign_currency_display)
            except ValueError:
                return localize(val) + ' ' + self.invoice.foreign_currency_display

        if len(tdata) > 1 and has_taxes:
            colwidths = [a * doc.width for a in (.25, .15, .15, .15, .3)]
            table = Table(tdata, colWidths=colwidths, repeatRows=2, hAlign=TA_LEFT)
            table.setStyle(TableStyle(tstyledata))
            story.append(Spacer(5 * mm, 5 * mm))
            story.append(KeepTogether([
                Paragraph(pgettext('invoice', 'Included taxes'), self.stylesheet['FineprintHeading']),
                table
            ]))

            if self.invoice.foreign_currency_display and self.invoice.foreign_currency_rate:
                tdata = [thead]

                for idx, gross in grossvalue_map.items():
                    rate, name = idx
                    if rate == 0:
                        continue
                    tax = taxvalue_map[idx]
                    gross = round_decimal(gross * self.invoice.foreign_currency_rate)
                    tax = round_decimal(tax * self.invoice.foreign_currency_rate)
                    net = gross - tax

                    tdata.append([
                        localize(rate) + " % " + name,
                        fmt(net), fmt(gross), fmt(tax), ''
                    ])

                table = Table(tdata, colWidths=colwidths, repeatRows=2, hAlign=TA_LEFT)
                table.setStyle(TableStyle(tstyledata))

                story.append(KeepTogether([
                    Spacer(1, height=2 * mm),
                    Paragraph(
                        pgettext(
                            'invoice', 'Using the conversion rate of 1:{rate} as published by the European Central Bank on '
                                       '{date}, this corresponds to:'
                        ).format(rate=localize(self.invoice.foreign_currency_rate),
                                 date=date_format(self.invoice.foreign_currency_rate_date, "SHORT_DATE_FORMAT")),
                        self.stylesheet['Fineprint']
                    ),
                    Spacer(1, height=3 * mm),
                    table
                ]))
        elif self.invoice.foreign_currency_display and self.invoice.foreign_currency_rate:
            story.append(Spacer(1, 5 * mm))
            story.append(Paragraph(
                pgettext(
                    'invoice', 'Using the conversion rate of 1:{rate} as published by the European Central Bank on '
                               '{date}, the invoice total corresponds to {total}.'
                ).format(rate=localize(self.invoice.foreign_currency_rate),
                         date=date_format(self.invoice.foreign_currency_rate_date, "SHORT_DATE_FORMAT"),
                         total=fmt(total)),
                self.stylesheet['Fineprint']
            ))

        return story


class Modern1Renderer(ClassicInvoiceRenderer):
    identifier = 'modern1'
    verbose_name = ugettext_lazy('Modern Invoice Renderer (pretix 2.7)')
    bottom_margin = 16.9 * mm
    top_margin = 16.9 * mm
    right_margin = 20 * mm
    invoice_to_height = 27.3 * mm
    invoice_to_width = 80 * mm
    invoice_to_left = 25 * mm
    invoice_to_top = (40 + 17.7) * mm
    invoice_from_left = 125 * mm
    invoice_from_top = 50 * mm
    invoice_from_width = pagesizes.A4[0] - invoice_from_left - right_margin
    invoice_from_height = 50 * mm

    logo_width = 75 * mm
    logo_height = 25 * mm
    logo_left = pagesizes.A4[0] - logo_width - right_margin
    logo_top = top_margin
    logo_anchor = 'e'

    event_left = 25 * mm
    event_top = top_margin
    event_width = 80 * mm
    event_height = 25 * mm

    def _get_stylesheet(self):
        stylesheet = super()._get_stylesheet()
        stylesheet.add(ParagraphStyle(name='Sender', fontName=self.font_regular, fontSize=8, leading=10))
        stylesheet['InvoiceFrom'].alignment = TA_RIGHT
        return stylesheet

    def _draw_invoice_from(self, canvas):
        if not self.invoice.invoice_from:
            return
        c = self.invoice.address_invoice_from.strip().split('\n')
        p = Paragraph(' · '.join(c), style=self.stylesheet['Sender'])
        p.wrapOn(canvas, self.invoice_to_width, 15.7 * mm)
        p.drawOn(canvas, self.invoice_to_left, self.pagesize[1] - self.invoice_to_top + 2 * mm)
        super()._draw_invoice_from(canvas)

    def _draw_invoice_to_label(self, canvas):
        pass

    def _draw_invoice_from_label(self, canvas):
        pass

    def _draw_event_label(self, canvas):
        pass

    def _get_first_page_frames(self, doc):
        footer_length = 3.5 * len(self.invoice.footer_text.split('\n')) * mm
        return [
            Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height - 95 * mm,
                  leftPadding=0, rightPadding=0, topPadding=0, bottomPadding=footer_length,
                  id='normal')
        ]

    def _draw_metadata(self, canvas):
        begin_top = 100 * mm

        textobject = canvas.beginText(self.left_margin, self.pagesize[1] - begin_top)
        textobject.setFont(self.font_regular, 8)
        textobject.textLine(pgettext('invoice', 'Order code'))
        textobject.moveCursor(0, 5)
        textobject.setFont(self.font_regular, 10)
        textobject.textLine(self.invoice.order.full_code)
        canvas.drawText(textobject)

        if self.invoice.is_cancellation:
            textobject = canvas.beginText(self.left_margin + 50 * mm, self.pagesize[1] - begin_top)
            textobject.setFont(self.font_regular, 8)
            textobject.textLine(pgettext('invoice', 'Cancellation number'))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.number)
            canvas.drawText(textobject)

            textobject = canvas.beginText(self.left_margin + 100 * mm, self.pagesize[1] - begin_top)
            textobject.setFont(self.font_regular, 8)
            textobject.textLine(pgettext('invoice', 'Original invoice'))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.refers.number)
            canvas.drawText(textobject)
        else:
            textobject = canvas.beginText(self.left_margin + 70 * mm, self.pagesize[1] - begin_top)
            textobject.textLine(pgettext('invoice', 'Invoice number'))
            textobject.moveCursor(0, 5)
            textobject.setFont(self.font_regular, 10)
            textobject.textLine(self.invoice.number)
            canvas.drawText(textobject)

        p = Paragraph(date_format(self.invoice.date, "DATE_FORMAT"), style=self.stylesheet['Normal'])
        w = stringWidth(p.text, p.frags[0].fontName, p.frags[0].fontSize)
        p.wrapOn(canvas, w, 15 * mm)
        date_x = self.pagesize[0] - w - self.right_margin
        p.drawOn(canvas, date_x, self.pagesize[1] - begin_top - 10 - 6)

        textobject = canvas.beginText(date_x, self.pagesize[1] - begin_top)
        textobject.setFont(self.font_regular, 8)
        if self.invoice.is_cancellation:
            textobject.textLine(pgettext('invoice', 'Cancellation date'))
        else:
            textobject.textLine(pgettext('invoice', 'Invoice date'))
        canvas.drawText(textobject)


@receiver(register_invoice_renderers, dispatch_uid="invoice_renderer_classic")
def recv_classic(sender, **kwargs):
    return [ClassicInvoiceRenderer, Modern1Renderer]