#! /usr/bin/python
# -*- coding: utf-8 -*-
# © 2017 Alexis de Lattre <alexis.delattre@akretion.com>

from optparse import OptionParser
import sys
from facturx import generate_facturx
from facturx.facturx import logger
import logging
from os.path import isfile, isdir

__author__ = "Alexis de Lattre <alexis.delattre@akretion.com>"
__date__ = "August 2017"
__version__ = "0.1"

options = [
    {'names': ('-l', '--log-level'), 'dest': 'log_level',
        'action': 'store', 'default': 'info',
        'help': "Set log level. Possible values: debug, info, warn, error. "
        "Default value: info."},
    {'names': ('-d', '--disable-xsd-check'), 'dest': 'disable_xsd_check',
        'action': 'store_true', 'default': False,
        'help': "De-activate XML Schema Definition check on Factur-X XML file "
        "(the check is enabled by default)"},
    {'names': ('-n', '--facturx-level'), 'dest': 'facturx_level',
        'action': 'store', 'default': 'autodetect',
        'help': "Specify the Factur-X level of the XML file. "
        "Default: autodetect. If you specify a particular level instead of "
        "using autodetection, you will win a very small amount of time "
        "(less than 1 millisecond). "
        "Possible values: minimum, basicwl, basic, en16931."},
    {'names': ('-a', '--meta-author'), 'dest': 'meta_author',
        'action': 'store', 'default': False,
        'help': "Specify the author for PDF metadata. Default: use the vendor "
        "name extracted from the Factur-X XML file."},
    {'names': ('-k', '--meta-keywords'), 'dest': 'meta_keywords',
        'action': 'store', 'default': False,
        'help': "Specify the keywords for PDF metadata. "
        "Default: 'Invoice, Factur-X'."},
    {'names': ('-t', '--meta-title'), 'dest': 'meta_title',
        'action': 'store', 'default': False,
        'help': "Specify the title of PDF metadata. "
        "Default: generic English title with information extracted from "
        "the Factur-X XML file such as: 'Akretion: Invoice I1242'"},
    {'names': ('-s', '--meta-subject'), 'dest': 'meta_subject',
        'action': 'store', 'default': False,
        'help': "Specify the subject of PDF metadata. "
        "Default: generic English subject with information extracted from the "
        "Factur-X XML file such as: "
        "'Factur-X invoice I1242 dated 2017-08-17 issued by Akretion'"},
    ]


def main(options, arguments):
    if options.log_level:
        log_level = options.log_level.lower()
        log_map = {
            'debug': logging.DEBUG,
            'info': logging.INFO,
            'warn': logging.WARN,
            'error': logging.ERROR,
        }
        if log_level in log_map:
            logger.setLevel(log_map[log_level])
        else:
            logger.error(
                'Wrong value for log level (%s). Possible values: %s',
                log_level, ', '.join(log_map.keys()))
            sys.exit(1)

    if len(arguments) != 3:
        logger.error(
            'This command requires 3 arguments (%d used). '
            'Use --help to get the details.', len(arguments))
        sys.exit(1)
    pdf_filename = arguments[0]
    xml_filename = arguments[1]
    facturx_pdf_filename = arguments[2]
    for filename in [pdf_filename, xml_filename]:
        if not isfile(filename):
            logger.error('Argument %s is not a filename', filename)
            sys.exit(1)
    if isdir(facturx_pdf_filename):
        logger.error(
            '3rd argument %s is a directory name (should be a the '
            'Factur-X PDF filename)', facturx_pdf_filename)
        sys.exit(1)
    pdf_file = open(pdf_filename)
    xml_file = open(xml_filename)
    check_xsd = True
    if options.disable_xsd_check:
        check_xsd = False
    pdf_metadata = None
    if (
            options.meta_author or
            options.meta_keywords or
            options.meta_title or
            options.meta_subject):
        pdf_metadata = {
            'author': options.meta_author,
            'keywords': options.meta_keywords,
            'title': options.meta_title,
            'subject': options.meta_subject,
            }
    # The important line of code is below !
    try:
        pdf_content = generate_facturx(
            pdf_file, xml_file, check_xsd=check_xsd,
            facturx_level=options.facturx_level, pdf_metadata=pdf_metadata)
    except Exception, e:
        logger.error(e)
        sys.exit(1)
    if isfile(facturx_pdf_filename):
        logger.warn(
            'File %s already exists. Overwriting it!', facturx_pdf_filename)
    facturx_pdf_file = open(facturx_pdf_filename, 'w')
    facturx_pdf_file.write(pdf_content)
    facturx_pdf_file.close()


if __name__ == '__main__':
    usage = "Usage: facturx-pdfgen <regular_invoice.pdf> <factur-x_xml.xml> "\
            "<facturx_invoice.pdf>\n"\
            "\nIf you use one of the --meta-* arguments, you should specify "\
            "all the meta-* arguments because the default values for "\
            "metadata only apply if none of the meta-* arguments are used."
    epilog = "Author: %s\n\nVersion: %s" % (__author__, __version__)
    description = "This script generate a Factur-X PDF invoice from a "\
                  "regular PDF invoice and a Factur-X XML file."
    parser = OptionParser(usage=usage, epilog=epilog, description=description)
    for option in options:
        param = option['names']
        del option['names']
        parser.add_option(*param, **option)
    options, arguments = parser.parse_args()
    sys.argv[:] = arguments
    main(options, arguments)