#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.  
#
import os.path
import optparse
from copy import deepcopy
from lxml import etree

from librarian import epub, DirDocProvider, ParseError, cover
from librarian.dcparser import BookInfo


def utf_trunc(text, limit):
    """ truncates text to at most `limit' bytes in utf-8 """
    if text is None:
        return text
    orig_text = text
    if len(text.encode('utf-8')) > limit:
        newlimit = limit - 3
        while len(text.encode('utf-8')) > newlimit:
            text = text[:(newlimit - len(text.encode('utf-8'))) / 4]
        text += '...'
    return text


def virtualo(filenames, output_dir, verbose):
    xml = etree.fromstring("""<?xml version="1.0" encoding="utf-8"?>
        <products xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></products>""")
    product = etree.fromstring("""<product>
            <publisherProductId></publisherProductId>
            <title></title>
            <info></info>
            <description></description>
            <authors>
                <author>
                    <names>Jan</names>
                    <lastName>Kowalski</lastName>
                </author>
            </authors>
            <price>0.0</price>
            <language>PL</language>
        </product>""")

    try:
        for main_input in input_filenames:
            if options.verbose:
                print main_input
            path, fname = os.path.realpath(main_input).rsplit('/', 1)
            provider = DirDocProvider(path)
            slug, ext = os.path.splitext(fname)

            outfile_dir = os.path.join(output_dir, slug)
            os.makedirs(os.path.join(output_dir, slug))

            info = BookInfo.from_file(main_input)

            product_elem = deepcopy(product)
            product_elem[0].text = utf_trunc(slug, 100)
            product_elem[1].text = utf_trunc(info.title, 255)
            product_elem[2].text = utf_trunc(info.description, 255)
            product_elem[3].text = utf_trunc(info.source_name, 3000)
            product_elem[4][0][0].text = utf_trunc(u' '.join(info.author.first_names), 100)
            product_elem[4][0][1].text = utf_trunc(info.author.last_name, 100)
            xml.append(product_elem)

            cover.virtualo_cover(
                u' '.join(info.author.first_names + (info.author.last_name,)), 
                info.title
                ).save(os.path.join(outfile_dir, slug+'.jpg'))
            outfile = os.path.join(outfile_dir, '1.epub')
            outfile_sample = os.path.join(outfile_dir, '1.sample.epub')
            epub.transform(provider, file_path=main_input, output_file=outfile)
            epub.transform(provider, file_path=main_input, output_file=outfile_sample, sample=25)
    except ParseError, e:
        print '%(file)s:%(name)s:%(message)s' % {
            'file': main_input,
            'name': e.__class__.__name__,
            'message': e.message
        }

    xml_file = open(os.path.join(output_dir, 'import_products.xml'), 'w')
    xml_file.write(etree.tostring(xml, pretty_print=True, encoding=unicode).encode('utf-8'))
    xml_file.close()




if __name__ == '__main__':
    # Parse commandline arguments
    usage = """Usage: %prog [options] SOURCE [SOURCE...]
    Prepare SOURCE files for a partner."""

    parser = optparse.OptionParser(usage=usage)

    parser.add_option('-v', '--verbose', action='store_true', dest='verbose', default=False,
        help='print status messages to stdout')
    parser.add_option('-O', '--output-dir', dest='output_dir', metavar='DIR', default='',
                      help='specifies the directory for output')
    parser.add_option('--virtualo', action='store_true', dest='virtualo', default=False,
                      help='prepare files for Virtualo API')

    options, input_filenames = parser.parse_args()

    if len(input_filenames) < 1:
        parser.print_help()
        exit(1)

    if options.virtualo:
        virtualo(input_filenames, options.output_dir, options.verbose)