from django.core.management.base import BaseCommand
from shop.pdf import generate_pdf_letter
from shop.email import send_invoice_email


class Command(BaseCommand):
    args = 'none'
    help = 'Send out invoices that have not been sent yet'

    def handle(self, *args, **options):
        self.stdout.write('Invoice worker running...')
        while True:
            ### check if we need to generate any invoices
            for order in Order.objects.filter(paid=True, invoice__isnull=True):
                ### generate invoice for this Order
                Invoice.objects.create(order=order)
                self.stdout.write('Generated Invoice object for order %s' % order)

            ### check if we need to generate any pdf invoices
            for invoice in Invoice.objects.filter(pdf_generated=False):
                # put the dict with data for the pdf together
                formatdict = {
                    'invoice': invoice,
                }
                # generate the pdf
                try:
                    pdffile = generate_pdf_letter(
                        filename=invoice.filename,
                        template='invoice.html',
                        formatdict=formatdict,
                    )
                    self.stdout.write('Generated pdf for invoice %s' % invoice)
                except Exception as E:
                    self.stdout.write('ERROR: Unable to generate PDF file for invoice #%s. Error: %s' % (invoice.pk, E))
                    continue
                # so, do we have a pdf?
                if not pdffile:
                    self.stdout.write('ERROR: Unable to generate PDF file for invoice #%s' % invoice.pk)
                    continue

                # update invoice object
                invoice.pdf_generated=True
                invoice.save()

            ### check if we need to send out any invoices
            for invoice in Invoice.objects.filter(sent_to_customer=False, pdf_generated=True):
                # read the pdf invoice from the archive
                with open(settings.INVOICE_ARCHIVE_PATH+invoice.filename, 'r') as fh:
                    pdffile = fh.read()

                # send the email
                if send_invoice_email(invoice=invoice, attachment=pdffile):
                    self.stdout.write('OK: Invoice email sent to %s' % order.user.email)
                    invoice.sent_to_customer=True
                    invoice.save()
                else:
                    self.stdout.write('ERROR: Unable to send invoice email for order %s to %s' % (order.pk, order.user.email))

            ### pause for a bit
            sleep(60)