# -*- coding: utf-8 -*-

import io

from odoo import models
from odoo.tools.pdf import OdooPdfFileReader, OdooPdfFileWriter


class IrActionsReport(models.Model):
    _inherit = 'ir.actions.report'

    def _render_qweb_pdf_prepare_streams(self, report_ref, data, res_ids=None):
        # EXTENDS base
        collected_streams = super()._render_qweb_pdf_prepare_streams(report_ref, data, res_ids=res_ids)

        if collected_streams \
                and res_ids \
                and len(res_ids) == 1 \
                and self._is_invoice_report(report_ref):
            invoice = self.env['account.move'].browse(res_ids)
            if invoice.is_sale_document() and invoice.state != 'draft':
                to_embed = invoice.edi_document_ids
                # Add the attachments to the pdf file
                if to_embed:
                    pdf_stream = collected_streams[invoice.id]['stream']

                    # Read pdf content.
                    pdf_content = pdf_stream.getvalue()
                    reader_buffer = io.BytesIO(pdf_content)
                    reader = OdooPdfFileReader(reader_buffer, strict=False)

                    # Post-process and embed the additional files.
                    writer = OdooPdfFileWriter()
                    writer.cloneReaderDocumentRoot(reader)
                    # Copy all pages from the reader to the writer (required for PyPDF2 3.x)
                    for page_num in range(reader.getNumPages()):
                        page = reader.getPage(page_num)
                        writer.addPage(page)
                    for edi_document in to_embed:
                        # The attachements on the edi documents are only system readable
                        # because they don't have res_id and res_model, here we are sure that
                        # the user has access to the invoice and edi document
                        edi_document.edi_format_id._prepare_invoice_report(writer, edi_document)

                    # Replace the current content.
                    pdf_stream.close()
                    new_pdf_stream = io.BytesIO()
                    writer.write(new_pdf_stream)
                    collected_streams[invoice.id]['stream'] = new_pdf_stream

        return collected_streams
