# © 2020 James R. Barlow: github.com/jbarlow83
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
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"""Tesseract bad utf8

In some cases, some versions of Tesseract can output binary gibberish or data
that is not UTF-8 compatible, so we are forced to check that we can convert it
and present it to the user.
"""

from subprocess import CalledProcessError
from unittest.mock import patch

from ocrmypdf import hookimpl
from ocrmypdf.builtin_plugins.tesseract_ocr import TesseractOcrEngine


def bad_utf8(*args, **kwargs):
    raise CalledProcessError(
        1,
        'tesseract',
        output=b'\x96\xb3\x8c\xf8\x82\xc8UTF-8\x0a',  # "Invalid UTF-8" in Shift JIS
        stderr=b"",
    )


class BadUtf8OcrEngine(TesseractOcrEngine):
    @staticmethod
    def generate_hocr(input_file, output_hocr, output_text, options):
        with patch('ocrmypdf._exec.tesseract.run', new=bad_utf8):
            TesseractOcrEngine.generate_hocr(
                input_file, output_hocr, output_text, options
            )

    @staticmethod
    def generate_pdf(input_file, output_pdf, output_text, options):
        with patch('ocrmypdf._exec.tesseract.run', new=bad_utf8):
            TesseractOcrEngine.generate_pdf(
                input_file, output_pdf, output_text, options
            )


@hookimpl
def get_ocr_engine():
    return BadUtf8OcrEngine()