@staticmethod
def check_file(filename):
    """Check file of any type: audio or image or annotated file.

        The extension of the filename is used to know the type of the file.

        :param filename: (str) name of the input file to diagnose.
        :return: tuple(status identifier, message)

        """
    if os.path.exists(filename) is False:
        return (annots.error, info(1008, 'annotations'))
    ext = os.path.splitext(filename)[1]
    if ext.lower() in audioopy_ext:
        return sppasDiagnosis.check_audio_file(filename)
    if ext.lower() in anndata_ext:
        return sppasDiagnosis.check_trs_file(filename)
    if ext.lower() in imgdata_ext:
        return sppasDiagnosis.check_img_file(filename)
    if ext.lower() in videodata_ext:
        return sppasDiagnosis.check_video_file(filename)
    message = info(1006, 'annotations') + info(1020, 'annotations').format(extension=ext)
    return (annots.error, message)

@staticmethod
def check_audio_file(filename):
    """Check an audio file.

        Are verified:

            1. the format of the file (error);
            2. the number of channels (error);
            3. the sample width (error or warning);
            4. the framerate (error or warning;
            5. the filename (warning).

        :param filename: (str) name of the input file
        :return: tuple with (status identifier, message)

        """
    if AUDIOOPY is False:
        status = annots.error
        message = "Audio file support is not available. 'Base' feature must be installed"
        return (status, message)
    status = annots.ok
    message = ''
    try:
        audio = audioopy.aio.open(filename)
        fm = audio.get_framerate()
        sp = audio.get_sampwidth() * 8
        nc = audio.get_nchannels()
        audio.close()
    except UnicodeDecodeError:
        message = info(1004, 'annotations') + info(1026, 'annotations').format(encoding=sg.__encoding__)
        return (annots.error, message)
    except Exception as e:
        message = info(1004, 'annotations') + str(e)
        return (annots.error, message)
    if nc > sppasDiagnosis.EXPECTED_CHANNELS:
        status = annots.error
        message += info(1010, 'annotations').format(number=nc)
    if sp < sppasDiagnosis.EXPECTED_SAMPLE_WIDTH * 8:
        status = annots.error
        message += info(1012, 'annotations').format(sampwidth=sp)
    if fm < sppasDiagnosis.EXPECTED_FRAME_RATE:
        status = annots.error
        message += info(1014, 'annotations').format(framerate=fm)
    if status != annots.error:
        if sp > sppasDiagnosis.EXPECTED_SAMPLE_WIDTH * 8:
            status = annots.warning
            message += info(1016, 'annotations').format(sampwidth=sp)
        if fm > sppasDiagnosis.EXPECTED_FRAME_RATE:
            status = annots.warning
            message += info(1018, 'annotations').format(framerate=fm)
    if all((ord(x) < 128 for x in filename)) is False:
        status = annots.warning
        message += info(1022, 'annotations')
    if ' ' in filename:
        status = annots.warning
        message += info(1024, 'annotations')
    if status == annots.error:
        message = info(1004, 'annotations') + message
    elif status == annots.warning:
        message = info(1002, 'annotations') + message
    else:
        message = info(1000, 'annotations')
    return (status, message)

@staticmethod
def check_trs_file(filename):
    """Check an annotated file.

        Are verified:

            1. the format of the file (error);
            2. the file encoding (error);
            3. the filename (warning).

        :param filename: (string) name of the input file
        :returns: tuple with (status identifier, message)

        """
    status = annots.ok
    message = info(1000, 'annotations')
    try:
        f = codecs.open(filename, 'r', sg.__encoding__)
        f.close()
    except UnicodeDecodeError:
        message = info(1004, 'annotations') + info(1026, 'annotations').format(encoding=sg.__encoding__)
        return (annots.error, message)
    except Exception as e:
        message = info(1004, 'annotations') + str(e)
        return (annots.error, message)
    if all((ord(x) < 128 for x in filename)) is False:
        message = info(1002, 'annotations') + info(1022, 'annotations')
        return (annots.warning, message)
    if ' ' in filename:
        message = info(1002, 'annotations') + info(1024, 'annotations')
        return (annots.warning, message)
    return (status, message)

@staticmethod
def check_img_file(filename):
    """Check an image file.

        Are verified:

            opencv can open the file

        :param filename: (string) name of the input file
        :returns: tuple with (status identifier, message)

        """
    status = annots.ok
    message = info(1000, 'annotations')
    return (status, message)

@staticmethod
def check_video_file(filename):
    """Check a video file.

        Are verified:

            opencv can open the file

        :param filename: (string) name of the input file
        :returns: tuple with (status identifier, message)

        """
    status = annots.ok
    message = info(1000, 'annotations')
    return (status, message)