# -*- coding: utf-8 -*-
# (C) 2011 by Bernd Wurst <bernd@schokokeks.org>

# This file is part of Bib2011.
#
# Bib2011 is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Bib2011 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Bib2011.  If not, see <http://www.gnu.org/licenses/>.

import os.path
import re

from reportlab.lib.pagesizes import A4
# reportlab imports
from reportlab.lib.units import cm, inch
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont, TTFError
from reportlab.pdfgen import canvas

from .InvoiceObjects import InvoiceTable, InvoiceText, InvoiceImage, GUTSCHRIFT


def _formatPrice(price, symbol='€'):
    '''_formatPrice(price, symbol='€'):
    Gets a floating point value and returns a formatted price, suffixed by 'symbol'. '''
    s = ("%.2f" % price).replace('.', ',')
    pat = re.compile(r'([0-9])([0-9]{3}[.,])')
    while pat.search(s):
        s = pat.sub(r'\1.\2', s)
    return s + ' ' + symbol


def find_font_file(filename):
    for n in range(4):
        candidate = os.path.abspath(os.path.join(os.path.dirname(__file__), '../' * n, 'ressource/fonts', filename))
        if os.path.exists(candidate):
            return candidate


def _registerFonts():
    fonts = [
        ("DejaVu", "DejaVuSans.ttf"),
        ("DejaVu-Bold", "DejaVuSans-Bold.ttf"),
        ("DejaVu-Italic", "DejaVuSans-Oblique.ttf"),
        ("DejaVu-BoldItalic", "DejaVuSans-BoldOblique.ttf")
    ]
    for fontname, fontfile in fonts:
        found = False
        try:
            pdfmetrics.registerFont(TTFont(fontname, fontfile))
            found = True
        except TTFError:
            pass
        if not found:
            f = find_font_file(fontfile)
            if f:
                pdfmetrics.registerFont(TTFont(fontname, f))


class PDF(object):
    # Set default font size
    default_font_size = 8
    font = 'DejaVu'
    # set margins
    topmargin = 2 * cm
    bottommargin = 2.2 * cm
    leftmargin = 2 * cm
    rightmargin = 2 * cm
    rightcolumn = 13 * cm

    canvas = None
    num_pages = 1
    font_height = 0.3 * cm
    line_padding = 0.1 * cm
    line_height = font_height + 0.1 * cm

    invoice = None

    def __init__(self, invoice):
        _registerFonts()
        from io import BytesIO
        self.fd = BytesIO()
        self.canvas = canvas.Canvas(self.fd, pagesize=A4)

        self.invoice = invoice

        self.topcontent = -self.topmargin
        self.leftcontent = self.leftmargin
        self.rightcontent = A4[0] - self.rightmargin
        self.bottomcontent = -(A4[1] - self.bottommargin)

        self.font_size = 8
        self.x = 2.0 * cm
        self.y = -4.8 * cm - self.font_size - 1

        self.canvas.setFont(self.font, self.font_size)

    def _splitToWidth(self, text, width, font, size):
        '''_splitToWidth(canvas, text, width, font, size)
        Split a string to several lines of a given width.'''
        lines = []
        paras = text.split('\n')
        for para in paras:
            words = para.split(' ')
            while len(words) > 0:
                mywords = [words[0], ]
                del words[0]
                while len(words) > 0 and self.canvas.stringWidth(' '.join(mywords) + ' ' + words[0], font,
                                                                 size) <= width:
                    mywords.append(words[0])
                    del words[0]
                lines.append(' '.join(mywords))
        return lines

    def _PageMarkers(self):
        """Setzt Falzmarken"""
        self.canvas.setStrokeColor((0, 0, 0))
        self.canvas.setLineWidth(0.01 * cm)
        self.canvas.lines([(0.3 * cm, -10.5 * cm, 0.65 * cm, -10.5 * cm),
                           (0.3 * cm, -21.0 * cm, 0.65 * cm, -21.0 * cm),
                           (0.3 * cm, -14.85 * cm, 0.7 * cm, -14.85 * cm)])

    def _lineHeight(self, fontsize=None, font=None):
        if not fontsize:
            fontsize = self.default_font_size
        if not font:
            font = self.font
        face = pdfmetrics.getFont(font).face
        string_height = (face.ascent - face.descent) / 1000 * fontsize
        return string_height + 0.1 * cm

    def _partHeight(self, part):
        height = 0
        if isinstance(part, InvoiceText):
            left, right = self.leftcontent, self.rightcontent
            if part.urgent:
                left += 1.5 * cm
                right -= 1.5 * cm
                height += len(part.paragraphs) * 3 * self.line_padding
                # Rechne eine Zeile mehr für den Rahmen
                height += self.line_height
            if part.headline:
                height += (len(self._splitToWidth(part.headline, right - left, self.font + '-Bold',
                                                  self.default_font_size + 1)) * self.line_height) + self.line_padding
            for para in part.paragraphs:
                height += (len(self._splitToWidth(para, right - left, self.font,
                                                  self.default_font_size)) * self.line_height) + self.line_padding
        elif isinstance(part, InvoiceTable):
            # Eine Zeile plus 2 mal line_padding für Tabellenkopf
            height = self.line_height + 2 * self.line_padding
            # Wenn nur ein Element (plus Summen) hin passt, reicht uns das
            el = part.entries[0]
            # Die Abstände oben und unten
            height += 2 * self.line_padding
            # Die Breite ist konservativ
            if el['type'] == 'title':
                height += self.line_height + 0.2 * cm
            else:
                height += self.line_height * len(self._splitToWidth(el['subject'], 9.3 * cm, self.font, self.font_size))
            if 'desc' in el and el['desc'] != '':
                height += self.line_height * len(self._splitToWidth(el['desc'], 11 * cm, self.font, self.font_size))
            if part.vatType == 'net':
                # Eine Zeile mehr
                height += self.line_height + self.line_padding
            # Für die MwSt-Summen
            height += (self.line_height + self.line_padding) * len(part.vat)
            # Für den Rechnungsbetrag
            height += self.line_height + self.line_padding
        return height

    def _tableHead(self, part):
        self.canvas.setFont(self.font, self.font_size)
        self.canvas.drawString(self.leftcontent + (0.1 * cm), self.y - self.line_height + self.line_padding, 'Anz.')
        self.canvas.drawString(self.leftcontent + (2.1 * cm), self.y - self.line_height + self.line_padding,
                               'Beschreibung')
        if len(part.vat) == 1:
            self.canvas.drawRightString(self.leftcontent + (14.3 * cm), self.y - self.line_height + self.line_padding,
                                        'Einzelpreis')
        else:
            self.canvas.drawRightString(self.leftcontent + (13.3 * cm), self.y - self.line_height + self.line_padding,
                                        'Einzelpreis')
        self.canvas.drawRightString(self.leftcontent + (16.8 * cm), self.y - self.line_height + self.line_padding,
                                    'Gesamtpreis')
        self.canvas.setLineWidth(0.01 * cm)
        self.canvas.line(self.leftcontent, self.y - self.line_height, self.rightcontent, self.y - self.line_height)
        self.y -= self.line_height + 0.02 * cm

    def _PageWrap(self):
        '''Seitenumbruch'''
        self.num_pages += 1
        self.canvas.setFont(self.font, self.default_font_size - 2)
        self.canvas.drawRightString(self.rightcontent, self.bottomcontent + self.line_padding,
                                    'Fortsetzung auf Seite %i' % self.num_pages)
        self.canvas.showPage()
        self.basicPage()
        self.y = self.topcontent - self.font_size
        self.canvas.setFillColor((0, 0, 0))
        self.canvas.setFont(self.font, self.font_size - 2)
        self.canvas.drawCentredString(self.leftcontent + (self.rightcontent - self.leftcontent) / 2, self.y,
                                      '- Seite %i -' % self.num_pages)

    def _Footer(self):
        self.canvas.setStrokeColor((0, 0, 0))
        self.canvas.setFillColor((0, 0, 0))
        self.canvas.line(self.leftcontent, self.bottomcontent, self.rightcontent, self.bottomcontent)
        self.canvas.setFont(self.font, 7)
        lines = list(filter(None, [
            self.invoice.seller['trade_name'],
            self.invoice.seller['name'] if self.invoice.seller['trade_name'] else None,
            self.invoice.seller['website'],
            self.invoice.seller['email'],
        ]))
        c = 0
        for line in lines:
            c += 10
            self.canvas.drawString(self.leftcontent, self.bottomcontent - c, line)

        if self.invoice.seller_vat_id:
            lines = list(filter(None, [
                "USt-ID: " + self.invoice.seller_vat_id
            ]))
            c = 0
            for line in lines:
                c += 10
                self.canvas.drawString(self.leftcontent + ((self.rightcontent - self.leftcontent) // 3),
                                       self.bottomcontent - c, line)

        if not self.invoice.debit:
            iban = self.invoice.seller_bank_data['iban']
            iban = ' '.join([iban[i:i + 4] for i in range(0, len(iban), 4)])
            lines = [
                f"IBAN: {iban}",
                self.invoice.seller_bank_data['bankname'],
                f"BIC: {self.invoice.seller_bank_data['bic']}" if self.invoice.seller_bank_data['bic'] else None,
            ]
            c = 0
            for line in lines:
                c += 10
                self.canvas.drawString(self.leftcontent + ((self.rightcontent - self.leftcontent) // 3) * 2,
                                       self.bottomcontent - c, line)

    def basicPage(self):
        # Set marker to top.
        self.canvas.translate(0, A4[1])

        self._PageMarkers()
        self._Footer()

    def addressBox(self):
        lines = [
            self.invoice.seller['trade_name'],
            self.invoice.seller['address']['line1'],
            self.invoice.seller['address']['line2'],
            self.invoice.seller['address']['line3'],
            self.invoice.seller['address']['postcode'] + ' ' + self.invoice.seller['address']['city_name'],
        ]
        address = ' · '.join(filter(None, lines))
        self.canvas.drawString(self.x, self.y + 0.1 * cm, f' {address}')
        self.canvas.line(self.x, self.y, self.x + (8.5 * cm), self.y)
        self.y = self.y - self.font_size - 3

        font_size = 11
        x = self.x + 0.5 * cm
        self.y -= 0.5 * cm
        self.canvas.setFont(self.font, font_size)
        addresslines = filter(None, [
            self.invoice.customer['name'].strip(),
            self.invoice.customer['address']['line1'] or '',
            self.invoice.customer['address']['line2'] or '',
            self.invoice.customer['address']['line3'] or '',
            ((self.invoice.customer['address']['postcode'] or '') + ' ' + (
                    self.invoice.customer['address']['city_name'] or '')).strip(),
        ])
        for line in addresslines:
            self.canvas.drawString(x, self.y, line)
            self.y -= font_size * 0.03527 * cm * 1.2

    def firstPage(self):
        self.basicPage()
        self.addressBox()

        self.y = self.topcontent
        self.canvas.drawImage(self.invoice.logo_image_file, self.rightcolumn, self.topcontent - (2 * cm),
                              height=2 * cm, preserveAspectRatio=True, anchor='nw')
        self.y -= (2.5 * cm)
        self.canvas.setFont(self.font + "-Bold", self.font_size)
        self.canvas.drawString(self.rightcolumn, self.y,
                               self.invoice.seller['trade_name'] or self.invoice.seller['name'])
        self.y -= (self.font_size + 5)
        self.canvas.setFont(self.font, self.font_size)
        lines = [
            self.invoice.seller['name'] if self.invoice.seller['trade_name'] else None,
            self.invoice.seller['address']['line1'],
            self.invoice.seller['address']['line2'],
            self.invoice.seller['address']['line3'],
            self.invoice.seller['address']['postcode'] + ' ' + self.invoice.seller['address']['city_name'],
            self.invoice.seller['website'],
        ]
        address = filter(None, lines)
        for line in address:
            self.canvas.drawString(self.rightcolumn, self.y, line)
            self.y -= (self.font_size + 5)
        self.y -= 5
        if self.invoice.seller['phone']:
            self.canvas.drawString(self.rightcolumn, self.y, f"Tel: {self.invoice.seller['phone']}")
            self.y -= (self.font_size + 5)
        if self.invoice.seller['email']:
            self.canvas.drawString(self.rightcolumn, self.y, f"E-Mail: {self.invoice.seller['email']}")
            self.y -= (self.font_size + 10)
        self.y = -9.5 * cm

    def title(self, title):
        self.canvas.setTitle(title)
        self.canvas.drawString(self.leftcontent, self.y, title)

    def renderRechnung(self):
        self.firstPage()
        self.canvas.setFont(self.font + '-Bold', self.font_size + 3)
        self.title(self.invoice.title)

        if self.invoice.tender:
            self.canvas.setFont(self.font, self.font_size)
            self.canvas.drawString(self.rightcolumn, self.y, "Erstellungsdatum:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.date.strftime('%d. %m. %Y'))
            self.y -= (self.font_size + 0.1 * cm)
        else:
            self.canvas.setFont(self.font + '-Bold', self.font_size)
            self.canvas.drawString(self.rightcolumn, self.y, "Bei Fragen bitte immer angeben:")
            self.y -= (self.font_size + 0.2 * cm)
            self.canvas.setFont(self.font, self.font_size)
            self.canvas.drawString(self.rightcolumn, self.y, "Rechnungsdatum:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.date.strftime('%d. %m. %Y'))
            self.y -= (self.font_size + 0.1 * cm)
            self.canvas.drawString(self.rightcolumn, self.y, "Rechnungsnummer:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.id)
            self.y -= (self.font_size + 0.1 * cm)
        if self.invoice.customerno:
            self.canvas.drawString(self.rightcolumn, self.y, "Kundennummer:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.customerno)
            self.y -= (self.font_size + 0.5 * cm)
        if self.invoice.leitweg_id:
            self.canvas.drawString(self.rightcolumn, self.y, "Leitweg-ID:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.leitweg_id)
            self.y -= (self.font_size + 0.1 * cm)
        if self.invoice.buyer_reference:
            self.canvas.drawString(self.rightcolumn, self.y, "Kunden-Referenz:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.buyer_reference)
            self.y -= (self.font_size + 0.1 * cm)
        if self.invoice.contract_number:
            self.canvas.drawString(self.rightcolumn, self.y, "Vertragsnummer:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.contract_number)
            self.y -= (self.font_size + 0.1 * cm)
        if self.invoice.order_number:
            self.canvas.drawString(self.rightcolumn, self.y, "Ihre Bestellnummer:")
            self.canvas.drawRightString(self.rightcontent, self.y, "%s" % self.invoice.order_number)
            self.y -= (self.font_size + 0.1 * cm)
        self.canvas.setFont(self.font, self.font_size)

        if self.invoice.salutation:
            self.canvas.drawString(self.leftcontent, self.y, self.invoice.salutation)
            self.y -= self.font_size + 0.2 * cm
            introText = 'hiermit stellen wir Ihnen die nachfolgend genannten Leistungen in Rechnung.'
            if self.invoice.tender:
                introText = 'hiermit unterbreiten wir Ihnen folgendes Angebot.'
            if self.invoice.type == GUTSCHRIFT:
                introText = 'nach unserer Berechnung entsteht für Sie folgende Gutschrift.'
            intro = self._splitToWidth(introText, self.rightcontent - self.leftcontent, self.font, self.font_size)
            for line in intro:
                self.canvas.drawString(self.leftcontent, self.y, line)
                self.y -= self.font_size + 0.1 * cm
            self.y -= self.font_size + 0.1 * cm

        font_size = self.default_font_size
        for part in self.invoice.parts:
            if self.y - self._partHeight(part) < (self.bottomcontent + (0.5 * cm)):
                self._PageWrap()
                self.y = self.topcontent - self.font_size - self.line_padding * 3
            if isinstance(part, InvoiceTable):

                left = self.leftcontent
                right = self.rightcontent
                self._tableHead(part)
                temp_sum = 0.0
                odd = True
                for el in part.entries:
                    if el['type'] == 'title':
                        self.y -= self.line_padding + 0.2 * cm
                        self.canvas.setFillColorRGB(0, 0, 0)
                        self.canvas.setFont(self.font + '-Italic', font_size)
                        self.canvas.drawString(left, self.y - self.font_height, el['title'])
                        self.canvas.setFont(self.font, font_size)
                        self.y -= self.line_height + self.line_padding
                    else:
                        if len(part.vat) == 1:
                            subject = self._splitToWidth(el['subject'], 9.8 * cm, self.font, font_size)
                        else:
                            subject = self._splitToWidth(el['subject'], 8.8 * cm, self.font, font_size)
                        desc = []
                        if 'desc' in el and el['desc'] != '':
                            desc = self._splitToWidth(el['desc'], 14.0 * cm, self.font, font_size)
                        if 'period_start' in el and el['period_start']:
                            if 'period_end' in el and el['period_end']:
                                desc.extend(self._splitToWidth('Leistungszeitraum: %s - %s' %
                                                               (el['period_start'].strftime('%d.%m.%Y'),
                                                                el['period_end'].strftime('%d.%m.%Y')),
                                                               14.0 * cm, self.font, font_size))
                            else:
                                desc.extend(self._splitToWidth('Leistungsdatum: %s' %
                                                               (el['period_start'].strftime('%d.%m.%Y'),),
                                                               14.0 * cm, self.font, font_size))
                        need_lines = len(subject) + len(desc)
                        # need page wrap?
                        if self.y - (need_lines + 1 * (self.line_height + self.line_padding)) < (
                                self.bottomcontent + 1 * cm):
                            self.canvas.setFont(self.font + '-Italic', font_size)
                            # Zwischensumme
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Zwischensumme:')
                            self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height,
                                                        _formatPrice(temp_sum))
                            # page wrap
                            self._PageWrap()
                            self.y = self.topcontent - font_size - self.line_padding * 3
                            # header
                            self._tableHead(part)
                            self.y -= self.line_padding * 3
                            odd = True
                            # übertrag
                            self.canvas.setFont(self.font + '-Italic', font_size)
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Übertrag:')
                            self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height,
                                                        _formatPrice(temp_sum))
                            self.y -= self.font_height + self.line_padding * 3
                            self.canvas.setFont(self.font, self.default_font_size)

                        # Zwischensumme (inkl. aktueller Posten)
                        temp_sum += el['total']

                        # draw the background
                        if not odd:
                            self.canvas.setFillColorRGB(0.9, 0.9, 0.9)
                        else:
                            self.canvas.setFillColorRGB(1, 1, 1)
                        self.canvas.rect(left, self.y - (need_lines * self.line_height) - (2 * self.line_padding),
                                         height=(need_lines * self.line_height) + (2 * self.line_padding),
                                         width=right - left, fill=1, stroke=0)
                        self.canvas.setFillColorRGB(0, 0, 0)
                        self.y -= self.line_padding
                        self.canvas.drawRightString(left + 1.1 * cm, self.y - self.font_height, '%.0f' % el['count'])
                        if el['unit']:
                            self.canvas.drawString(left + 1.2 * cm, self.y - self.font_height, el['unit'])
                        self.canvas.drawString(left + 2.2 * cm, self.y - self.font_height, subject[0])
                        if len(part.vat) == 1:
                            self.canvas.drawRightString(left + 14.3 * cm, self.y - self.font_height,
                                                        _formatPrice(el['price']))
                        else:
                            self.canvas.drawRightString(left + 13.3 * cm, self.y - self.font_height,
                                                        _formatPrice(el['price']))
                            self.canvas.drawString(left + 13.7 * cm, self.y - self.font_height,
                                                   str(part.vat[el['vat']][1]))
                        if el['tender']:
                            self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, 'eventual')
                        else:
                            self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height,
                                                        _formatPrice(el['total']))
                        subject = subject[1:]
                        x = 1
                        for line in subject:
                            self.canvas.drawString(left + 2.2 * cm, self.y - (x * self.line_height) - self.font_height,
                                                   line)
                            x += 1
                        for line in desc:
                            self.canvas.drawString(left + 2.2 * cm, self.y - (x * self.line_height) - self.font_height,
                                                   line)
                            x += 1
                        odd = not odd
                        self.y -= (need_lines * self.line_height) + self.line_padding
                if part.summary:
                    need_lines = 5
                    if self.y - (need_lines + 1 * (self.line_height + self.line_padding)) < (
                            self.bottomcontent + 1 * cm):
                        self.canvas.setFont(self.font + '-Italic', font_size)
                        # Zwischensumme
                        self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Zwischensumme:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(temp_sum))
                        # page wrap
                        self._PageWrap()
                        self.y = self.topcontent - font_size - self.line_padding * 3
                        # header
                        self._tableHead(part)
                        odd = True
                        # übertrag
                        self.canvas.setFont(self.font + '-Italic', font_size)
                        self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Übertrag:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(temp_sum))
                        self.y -= self.font_height + self.line_padding
                    self.y -= (0.3 * cm)
                    if part.vatType == 'gross':
                        self.canvas.setFont(self.font + '-Bold', font_size)
                        if self.invoice.tender or not self.invoice.official:
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Gesamtbetrag:')
                        else:
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Rechnungsbetrag:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(part.sum))
                        if self.invoice.official:
                            self.canvas.setFont(self.font, font_size)
                            self.y -= self.line_height + self.line_padding
                            summaries = []
                            vat = 0.0
                            if len(part.vat) == 1 and list(part.vat.keys())[0] == 0.0:
                                self.canvas.drawString(left, self.y - self.font_height,
                                                       'Dieser Beleg wurde ohne Ausweis von MwSt erstellt.')
                                self.y -= self.line_height
                            else:
                                if len(part.vat) == 1:
                                    vat = list(part.vat.keys())[0]
                                    if self.invoice.tender:
                                        summaries.append(('Im Gesamtbetrag sind %.1f%% MwSt enthalten:' % (vat * 100),
                                                          _formatPrice((part.sum / (vat + 1)) * vat)))
                                    else:
                                        summaries.append((
                                            'Im Rechnungsbetrag sind %.1f%% MwSt enthalten:' % (vat * 100),
                                            _formatPrice((part.sum / (vat + 1)) * vat)))
                                else:
                                    for vat, vatdata in part.vat.items():
                                        if vat > 0:
                                            summaries.append(('%s: Im Teilbetrag von %s sind %.1f%% MwSt enthalten:' % (
                                                vatdata[1], _formatPrice(vatdata[0]), vat * 100),
                                                              _formatPrice((vatdata[0] / (vat + 1)) * vat)))
                                        else:
                                            summaries.append(('%s: Durchlaufende Posten ohne Berechnung von MwSt.' % (
                                                vatdata[1]), 0.0))
                            summaries.append(('Nettobetrag:', _formatPrice(part.sum - (part.sum / (vat + 1)) * vat)))
                            summaries.sort()
                            for line in summaries:
                                self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, line[0])
                                if line[1]:
                                    self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, line[1])
                                self.y -= self.line_height
                    elif len(part.vat) == 1 and part.vatType == 'net':
                        self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Nettobetrag:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(part.sum))
                        self.y -= self.line_height
                        summaries = []
                        if list(part.vat.keys())[0] == 0.0:
                            self.canvas.drawString(left, self.y - self.font_height,
                                                   'Dieser Beleg wurde ohne Ausweis von MwSt erstellt.')
                            self.y -= self.line_height
                        else:
                            if len(part.vat) == 1:
                                vat = list(part.vat.keys())[0]
                                summaries.append(('zzgl. %.1f%% MwSt:' % (vat * 100), _formatPrice(vat * part.sum)))
                            else:
                                for vat, vatdata in part.vat.items():
                                    summaries.append(('zzgl. %.1f%% MwSt (%s):' % (vat * 100, vatdata[1]),
                                                      _formatPrice(vat * vatdata[0])))
                        summaries.sort()
                        for line in summaries:
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, line[0])
                            self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, line[1])
                            self.y -= self.line_height
                        sum = 0
                        for vat, vatdata in part.vat.items():
                            sum += (vat + 1) * vatdata[0]
                        self.canvas.setFont(self.font + '-Bold', font_size)
                        if self.invoice.tender:
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Gesamtbetrag:')
                        else:
                            self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, 'Rechnungsbetrag:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(sum))
                        self.canvas.setFont(self.font, font_size)
                        self.y -= self.line_height + self.line_padding
                    paysum = 0.0
                    for pay in part.payments:
                        paysum += pay['amount']
                        descr = 'Zahlung'
                        if pay['type'] == 'cash':
                            descr = 'gegeben'
                        elif pay['type'] == 'return':
                            descr = 'zurück'
                        elif pay['type'] == 'ec':
                            descr = 'Kartenzahlung (EC)'
                        elif pay['type'] == 'gutschein':
                            descr = 'Einlösung Gutschein'
                        if pay['date'] != self.invoice.date:
                            descr += ' am %s' % (pay['date'].strftime('%d. %m. %Y'))
                        self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height, descr + ':')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height,
                                                    _formatPrice(pay['amount']))
                        self.y -= self.line_height
                    sum = part.sum
                    if part.vatType == 'net':
                        sum = 0
                        for vat, vatdata in part.vat.items():
                            sum += (vat + 1) * vatdata[0]
                    rest = sum - paysum
                    if part.payments and rest > 0:
                        self.canvas.setFont(self.font + '-Bold', font_size)
                        self.canvas.drawRightString(left + 14.5 * cm, self.y - self.font_height,
                                                    'Offener Rechnungsbetrag:')
                        self.canvas.drawRightString(left + 16.8 * cm, self.y - self.font_height, _formatPrice(rest))
                        self.canvas.setFont(self.font, font_size)
                        self.y -= self.line_height + self.line_padding

                    self.y -= self.line_padding
            elif isinstance(part, InvoiceText):
                my_font_size = font_size + part.fontsize  # Relative Schriftgröße beachten
                self.canvas.setFont(self.font, my_font_size)
                left, right = self.leftcontent, self.rightcontent
                firsttime = True
                headlines = []
                if part.urgent:
                    left += 1.5 * cm
                    right -= 1.5 * cm
                if part.headline:
                    headlines = self._splitToWidth(part.headline, right - left, self.font, my_font_size)
                for para in part.paragraphs:
                    lines = self._splitToWidth(para, right - left, self.font, my_font_size)
                    if part.urgent:
                        need_height = len(lines) * self._lineHeight(my_font_size)
                        if len(headlines) > 0:
                            need_height += len(headlines) * (self._lineHeight(my_font_size) + 1) + self.line_padding
                        self.canvas.setFillColorRGB(0.95, 0.95, 0.95)
                        self.canvas.rect(left - 0.5 * cm, self.y - (need_height + (6 * self.line_padding)),
                                         height=need_height + (6 * self.line_padding), width=right - left + 1 * cm,
                                         fill=1, stroke=1)
                        self.canvas.setFillColorRGB(0, 0, 0)
                        self.y -= self.line_padding * 3
                    if part.headline and firsttime:
                        firsttime = False
                        self.canvas.setFont(self.font + '-Bold', my_font_size + 1)
                        for line in headlines:
                            self.canvas.drawString(left, self.y - (self.font_height + 1), line)
                            self.y -= self._lineHeight(my_font_size) + 1
                        self.y -= self.line_padding
                        self.canvas.setFont(self.font, my_font_size)
                    for line in lines:
                        self.canvas.drawString(left, self.y - self.font_height, line)
                        self.y -= self._lineHeight(my_font_size)
                    self.y -= self.line_padding * 3
            elif isinstance(part, InvoiceImage):
                width = (part.imagedata.width / part.dpi) * inch
                height = width * (part.imagedata.height / part.imagedata.width)
                x = self.leftcontent
                if part.alignment == "center":
                    x = self.leftcontent + (self.rightcontent - self.leftcontent) / 2 - width / 2
                elif part.alignment == "right":
                    x = self.rightcontent - width
                self.canvas.drawInlineImage(part.imagedata, x, self.y - height, width=width, height=height)
                self.y -= self.line_padding + height
                if part.caption:
                    self.canvas.drawString(x, self.y - self.font_height, part.caption)
                    self.y -= self._lineHeight()
            else:
                raise NotImplementedError("Cannot handle part of type %s" % type(part))
            self.y -= (0.5 * cm)

        self.canvas.showPage()
        self.canvas.save()
        pdfdata = self.fd.getvalue()
        return pdfdata


def InvoiceToPDF(iv):
    pdf = PDF(iv)
    return pdf.renderRechnung()