def extract_data(invoicefile, templates=None, input_module=pdftotext):
    """Extracts structured data from PDF/image invoices.

    This function uses the text extracted from a PDF file or image and
    pre-defined regex templates to find structured data.

    Reads template if no template assigned
    Required fields are matches from templates

    Parameters
    ----------
    invoicefile : str
        path of electronic invoice file in PDF,JPEG,PNG (example: "/home/duskybomb/pdf/invoice.pdf")
    templates : list of instances of class `InvoiceTemplate`, optional
        Templates are loaded using `read_template` function in `loader.py`
    input_module : {'pdftotext', 'pdfminer', 'tesseract'}, optional
        library to be used to extract text from given `invoicefile`,

    Returns
    -------
    dict or False
        extracted and matched fields or False if no template matches

    Notes
    -----
    Import required `input_module` when using invoice2data as a library

    See Also
    --------
    read_template : Function where templates are loaded
    InvoiceTemplate : Class representing single template files that live as .yml files on the disk

    Examples
    --------
    When using `invoice2data` as an library

    >>> from invoice2data.input import pdftotext
    >>> extract_data("invoice2data/test/pdfs/oyo.pdf", None, pdftotext)
    {'issuer': 'OYO', 'amount': 1939.0, 'date': datetime.datetime(2017, 12, 31, 0, 0), 'invoice_number': 'IBZY2087',
     'currency': 'INR', 'desc': 'Invoice IBZY2087 from OYO'}

    """
    if templates is None:
        templates = read_templates()

    # print(templates[0])
    extracted_str = input_module.to_text(invoicefile).decode('utf-8')

    logger.debug('START pdftotext result ===========================')
    logger.debug(extracted_str)
    logger.debug('END pdftotext result =============================')

    logger.debug('Testing {} template files'.format(len(templates)))
    for t in templates:
        optimized_str = t.prepare_input(extracted_str)

        if t.matches_input(optimized_str):
            return t.extract(optimized_str)

    logger.error('No template for %s', invoicefile)
    return False