invoice.py

import os
import configparser
from subprocess import Popen
from platform import system
from datetime import datetime
from tempfile import NamedTemporaryFile
from InvoiceGenerator.api import Invoice, Item, Client, Provider, Creator, Address
from InvoiceGenerator.pdf import SimpleInvoice

ICONS = os.path.join('.', 'icons')


class Invoicing(object):
    def __init__(self):
        pass

    def invoicing(self, c, lines, iva=21, invoice_num=None):
        if not invoice_num:
            invoice_num = "F000001"
        else:
            invoice_num = 'F{}'.format(str(invoice_num).zfill(6))
        # choose catalan language
        os.environ["INVOICE_LANG"] = "ca"

        client = Client(
            c.name, address=c.direccio, zip_code=c.cp, phone=c.phone, email=c.email, vat_id=c.cif,
        )
        name, cp, address, city, email, phone = self.get_config_file_info()

        provider = Provider(
            name, zip_code=cp, address=address, city=city, email=email, phone=phone, vat_id='E17087289',
            logo_filename=ICONS + '/logo_factura.jpg'
        )

        creator = Creator(name)

        invoice = Invoice(client, provider, creator)
        os.environ["INVOICE_LANG"] = "ca"
        invoice.currency_locale = 'ca_ES.UTF-8'
        invoice.currency = '€'
        invoice.number = invoice_num
        invoice.use_tax = True
        invoice.date = datetime.now()
        for line_product in lines:
            price_without_iva = self.extract_iva(line_product.price, iva)
            invoice.add_item(
                Item(
                    count=line_product.quant, price=float(price_without_iva), description=line_product.name, tax=iva
                )
            )

        f = NamedTemporaryFile(delete=False, suffix='.pdf')
        pdf_path = f.name
        pdf = SimpleInvoice(invoice)
        pdf.gen(pdf_path, generate_qr_code=False)

        return pdf_path

    @staticmethod
    def open_invoice(filename):
        try:
            os_name = system().lower()
            if os_name == 'windows':
                starter = 'start'
            elif os_name == 'linux':
                starter = 'xdg-open'
            elif os_name == 'darwin':
                starter = 'open'
            start = ' '.join([starter, filename])
            Popen(start, shell=True)
        except Exception as err:
            print(err)
            pass

    @staticmethod
    def extract_iva(total, iva):
        substract = float(total) / (1 + (float(iva) / 100.0))
        return substract

    @staticmethod
    def get_config_file_info():
        parser = configparser.ConfigParser()
        base_path = './configs/'
        parser.read(base_path + '/config.cfg')
        name = parser.get('P_NAME', 'p_name')
        cp = parser.get('P_CP', 'p_cp')
        address = parser.get('P_ADDRESS', 'p_address')
        city = parser.get('P_CITY', 'p_city')
        email = parser.get('P_EMAIL', 'p_email')
        phone = parser.get('P_PHONE', 'p_phone')

        return name, cp, address, city, email, phone