# -*- 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.
#
from __future__ import with_statement

import os
import os.path
import re
import subprocess
from StringIO import StringIO
from copy import deepcopy
from mimetypes import guess_type

from lxml import etree
import zipfile
from tempfile import mkdtemp, NamedTemporaryFile
from shutil import rmtree

from librarian import RDFNS, WLNS, NCXNS, OPFNS, XHTMLNS, DCNS, OutputFile
from librarian.cover import make_cover

from librarian import functions, get_resource

from librarian.hyphenator import Hyphenator

functions.reg_person_name()
functions.reg_lang_code_3to2()


def set_hyph_language(source_tree):
    def get_short_lng_code(text):
        result = ''
        text = ''.join(text)
        with open(get_resource('res/ISO-639-2_8859-1.txt'), 'rb') as f:
            for line in f:
                list = line.strip().split('|')
                if list[0] == text:
                    result = list[2]
        if result == '':
            return text
        else:
            return result
    bibl_lng = etree.XPath('//dc:language//text()',
                           namespaces={'dc': str(DCNS)})(source_tree)
    short_lng = get_short_lng_code(bibl_lng[0])
    try:
        return Hyphenator(get_resource('res/hyph-dictionaries/hyph_' +
                                       short_lng + '.dic'))
    except:
        pass


def hyphenate_and_fix_conjunctions(source_tree, hyph):
    texts = etree.XPath('/utwor/*[2]//text()')(source_tree)
    for t in texts:
        parent = t.getparent()
        if hyph is not None:
            newt = ''
            wlist = re.compile(r'\w+|[^\w]', re.UNICODE).findall(t)
            for w in wlist:
                newt += hyph.inserted(w, u'\u00AD')
        else:
            newt = t
        newt = re.sub(r'(?<=\s\w)\s+', u'\u00A0', newt)
        if t.is_text:
            parent.text = newt
        elif t.is_tail:
            parent.tail = newt


def inner_xml(node):
    """ returns node's text and children as a string

    >>> print inner_xml(etree.fromstring('<a>x<b>y</b>z</a>'))
    x<b>y</b>z
    """

    nt = node.text if node.text is not None else ''
    return ''.join([nt] + [etree.tostring(child) for child in node])


def set_inner_xml(node, text):
    """ sets node's text and children from a string

    >>> e = etree.fromstring('<a>b<b>x</b>x</a>')
    >>> set_inner_xml(e, 'x<b>y</b>z')
    >>> print etree.tostring(e)
    <a>x<b>y</b>z</a>
    """

    p = etree.fromstring('<x>%s</x>' % text)
    node.text = p.text
    node[:] = p[:]


def node_name(node):
    """ Find out a node's name

    >>> print node_name(etree.fromstring('<a>X<b>Y</b>Z</a>'))
    XYZ
    """

    tempnode = deepcopy(node)

    for p in ('pe', 'pa', 'pt', 'pr', 'motyw'):
        for e in tempnode.findall('.//%s' % p):
            t = e.tail
            e.clear()
            e.tail = t
    etree.strip_tags(tempnode, '*')
    return tempnode.text


def xslt(xml, sheet, **kwargs):
    if isinstance(xml, etree._Element):
        xml = etree.ElementTree(xml)
    with open(sheet) as xsltf:
        transform = etree.XSLT(etree.parse(xsltf))
        params = dict((key, transform.strparam(value)) for key, value in kwargs.iteritems())
        return transform(xml, **params)


def replace_characters(node):
    def replace_chars(text):
        if text is None:
            return None
        return text.replace(u"\ufeff", u"")\
                   .replace("---", u"\u2014")\
                   .replace("--", u"\u2013")\
                   .replace(",,", u"\u201E")\
                   .replace('"', u"\u201D")\
                   .replace("'", u"\u2019")
    if node.tag in ('uwaga', 'extra'):
        t = node.tail
        node.clear()
        node.tail = t
    node.text = replace_chars(node.text)
    node.tail = replace_chars(node.tail)
    for child in node:
        replace_characters(child)


def find_annotations(annotations, source, part_no):
    for child in source:
        if child.tag in ('pe', 'pa', 'pt', 'pr'):
            annotation = deepcopy(child)
            number = str(len(annotations) + 1)
            annotation.set('number', number)
            annotation.set('part', str(part_no))
            annotation.tail = ''
            annotations.append(annotation)
            tail = child.tail
            child.clear()
            child.tail = tail
            child.text = number
        if child.tag not in ('extra', 'uwaga'):
            find_annotations(annotations, child, part_no)


class Stanza(object):
    """
    Converts / verse endings into verse elements in a stanza.

    Slashes may only occur directly in the stanza. Any slashes in subelements
    will be ignored, and the subelements will be put inside verse elements.

    >>> s = etree.fromstring("<strofa>a <b>c</b> <b>c</b>/\\nb<x>x/\\ny</x>c/ \\nd</strofa>")
    >>> Stanza(s).versify()
    >>> print etree.tostring(s)
    <strofa><wers_normalny>a <b>c</b> <b>c</b></wers_normalny><wers_normalny>b<x>x/
    y</x>c</wers_normalny><wers_normalny>d</wers_normalny></strofa>

    """
    def __init__(self, stanza_elem):
        self.stanza = stanza_elem
        self.verses = []
        self.open_verse = None

    def versify(self):
        self.push_text(self.stanza.text)
        for elem in self.stanza:
            self.push_elem(elem)
            self.push_text(elem.tail)
        tail = self.stanza.tail
        self.stanza.clear()
        self.stanza.tail = tail
        self.stanza.extend(self.verses)

    def open_normal_verse(self):
        self.open_verse = self.stanza.makeelement("wers_normalny")
        self.verses.append(self.open_verse)

    def get_open_verse(self):
        if self.open_verse is None:
            self.open_normal_verse()
        return self.open_verse

    def push_text(self, text):
        if not text:
            return
        for i, verse_text in enumerate(re.split(r"/\s*\n", text)):
            if i:
                self.open_normal_verse()
            if not verse_text.strip():
                continue
            verse = self.get_open_verse()
            if len(verse):
                verse[-1].tail = (verse[-1].tail or "") + verse_text
            else:
                verse.text = (verse.text or "") + verse_text

    def push_elem(self, elem):
        if elem.tag.startswith("wers"):
            verse = deepcopy(elem)
            verse.tail = None
            self.verses.append(verse)
            self.open_verse = verse
        else:
            appended = deepcopy(elem)
            appended.tail = None
            self.get_open_verse().append(appended)


def replace_by_verse(tree):
    """ Find stanzas and create new verses in place of a '/' character """

    stanzas = tree.findall('.//' + WLNS('strofa'))
    for stanza in stanzas:
        Stanza(stanza).versify()


def add_to_manifest(manifest, partno):
    """ Adds a node to the manifest section in content.opf file """

    partstr = 'part%d' % partno
    e = manifest.makeelement(
        OPFNS('item'), attrib={'id': partstr, 'href': partstr + '.html',
                               'media-type': 'application/xhtml+xml'}
    )
    manifest.append(e)


def add_to_spine(spine, partno):
    """ Adds a node to the spine section in content.opf file """

    e = spine.makeelement(OPFNS('itemref'), attrib={'idref': 'part%d' % partno})
    spine.append(e)


class TOC(object):
    def __init__(self, name=None, part_href=None):
        self.children = []
        self.name = name
        self.part_href = part_href
        self.sub_number = None

    def add(self, name, part_href, level=0, is_part=True, index=None):
        assert level == 0 or index is None
        if level > 0 and self.children:
            return self.children[-1].add(name, part_href, level - 1, is_part)
        else:
            t = TOC(name)
            t.part_href = part_href
            if index is not None:
                self.children.insert(index, t)
            else:
                self.children.append(t)
            if not is_part:
                t.sub_number = len(self.children) + 1
                return t.sub_number

    def append(self, toc):
        self.children.append(toc)

    def extend(self, toc):
        self.children.extend(toc.children)

    def depth(self):
        if self.children:
            return max((c.depth() for c in self.children)) + 1
        else:
            return 0

    def href(self):
        src = self.part_href
        if self.sub_number is not None:
            src += '#sub%d' % self.sub_number
        return src

    def write_to_xml(self, nav_map, counter=1):
        for child in self.children:
            nav_point = nav_map.makeelement(NCXNS('navPoint'))
            nav_point.set('id', 'NavPoint-%d' % counter)
            nav_point.set('playOrder', str(counter))

            nav_label = nav_map.makeelement(NCXNS('navLabel'))
            text = nav_map.makeelement(NCXNS('text'))
            if child.name is not None:
                text.text = re.sub(r'\n', ' ', child.name)
            else:
                text.text = child.name
            nav_label.append(text)
            nav_point.append(nav_label)

            content = nav_map.makeelement(NCXNS('content'))
            content.set('src', child.href())
            nav_point.append(content)
            nav_map.append(nav_point)
            counter = child.write_to_xml(nav_point, counter + 1)
        return counter

    def html_part(self, depth=0):
        texts = []
        for child in self.children:
            texts.append(
                "<div style='margin-left:%dem;'><a href='%s'>%s</a></div>" %
                (depth, child.href(), child.name))
            texts.append(child.html_part(depth + 1))
        return "\n".join(texts)

    def html(self):
        with open(get_resource('epub/toc.html')) as f:
            t = unicode(f.read(), 'utf-8')
        return t % self.html_part()


def used_chars(element):
    """ Lists characters used in an ETree Element """
    chars = set((element.text or '') + (element.tail or ''))
    for child in element:
        chars = chars.union(used_chars(child))
    return chars


def chop(main_text):
    """ divide main content of the XML file into chunks """

    # prepare a container for each chunk
    part_xml = etree.Element('utwor')
    etree.SubElement(part_xml, 'master')
    main_xml_part = part_xml[0]  # master

    last_node_part = False

    # the below loop are workaround for a problem with epubs in drama ebooks without acts
    is_scene = False
    is_act = False
    for one_part in main_text:
        name = one_part.tag
        if name == 'naglowek_scena':
            is_scene = True
        elif name == 'naglowek_akt':
            is_act = True

    for one_part in main_text:
        name = one_part.tag
        if is_act is False and is_scene is True:
            if name == 'naglowek_czesc':
                yield part_xml
                last_node_part = True
                main_xml_part[:] = [deepcopy(one_part)]
            elif not last_node_part and name == "naglowek_scena":
                yield part_xml
                main_xml_part[:] = [deepcopy(one_part)]
            else:
                main_xml_part.append(deepcopy(one_part))
                last_node_part = False
        else:
            if name == 'naglowek_czesc':
                yield part_xml
                last_node_part = True
                main_xml_part[:] = [deepcopy(one_part)]
            elif not last_node_part and name in ("naglowek_rozdzial", "naglowek_akt", "srodtytul"):
                yield part_xml
                main_xml_part[:] = [deepcopy(one_part)]
            else:
                main_xml_part.append(deepcopy(one_part))
                last_node_part = False
    yield part_xml


def transform_chunk(chunk_xml, chunk_no, annotations, empty=False, _empty_html_static=[]):
    """ transforms one chunk, returns a HTML string, a TOC object and a set of used characters """

    toc = TOC()
    for element in chunk_xml[0]:
        if element.tag == "naglowek_czesc":
            toc.add(node_name(element), "part%d.html#book-text" % chunk_no)
        elif element.tag in ("naglowek_rozdzial", "naglowek_akt", "srodtytul"):
            toc.add(node_name(element), "part%d.html" % chunk_no)
        elif element.tag in ('naglowek_podrozdzial', 'naglowek_scena'):
            subnumber = toc.add(node_name(element), "part%d.html" % chunk_no, level=1, is_part=False)
            element.set('sub', str(subnumber))
    if empty:
        if not _empty_html_static:
            _empty_html_static.append(open(get_resource('epub/emptyChunk.html')).read())
        chars = set()
        output_html = _empty_html_static[0]
    else:
        find_annotations(annotations, chunk_xml, chunk_no)
        replace_by_verse(chunk_xml)
        html_tree = xslt(chunk_xml, get_resource('epub/xsltScheme.xsl'))
        chars = used_chars(html_tree.getroot())
        output_html = etree.tostring(
            html_tree, pretty_print=True, xml_declaration=True,
            encoding="utf-8",
            doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ' +
                    '"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
        )
    return output_html, toc, chars


def transform(wldoc, verbose=False, style=None, html_toc=False,
              sample=None, cover=None, flags=None, hyphenate=False, ilustr_path='', output_type='epub'):
    """ produces a EPUB file

    sample=n: generate sample e-book (with at least n paragraphs)
    cover: a cover.Cover factory or True for default
    flags: less-advertising, without-fonts, working-copy
    """

    def transform_file(wldoc, chunk_counter=1, first=True, sample=None):
        """ processes one input file and proceeds to its children """

        replace_characters(wldoc.edoc.getroot())

        hyphenator = set_hyph_language(wldoc.edoc.getroot()) if hyphenate else None
        hyphenate_and_fix_conjunctions(wldoc.edoc.getroot(), hyphenator)

        # every input file will have a TOC entry,
        # pointing to starting chunk
        toc = TOC(wldoc.book_info.title, "part%d.html" % chunk_counter)
        chars = set()
        if first:
            # write book title page
            html_tree = xslt(wldoc.edoc, get_resource('epub/xsltTitle.xsl'), outputtype=output_type)
            chars = used_chars(html_tree.getroot())
            zip.writestr(
                'OPS/title.html',
                etree.tostring(
                    html_tree, pretty_print=True, xml_declaration=True,
                    encoding="utf-8",
                    doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"' +
                            ' "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
                )
            )
            # add a title page TOC entry
            toc.add(u"Strona tytułowa", "title.html")
        elif wldoc.book_info.parts:
            # write title page for every parent
            if sample is not None and sample <= 0:
                chars = set()
                html_string = open(get_resource('epub/emptyChunk.html')).read()
            else:
                html_tree = xslt(wldoc.edoc, get_resource('epub/xsltChunkTitle.xsl'))
                chars = used_chars(html_tree.getroot())
                html_string = etree.tostring(
                    html_tree, pretty_print=True, xml_declaration=True,
                    encoding="utf-8",
                    doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"' +
                            ' "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
                )
            zip.writestr('OPS/part%d.html' % chunk_counter, html_string)
            add_to_manifest(manifest, chunk_counter)
            add_to_spine(spine, chunk_counter)
            chunk_counter += 1

        if len(wldoc.edoc.getroot()) > 1:
            # rdf before style master
            main_text = wldoc.edoc.getroot()[1]
        else:
            # rdf in style master
            main_text = wldoc.edoc.getroot()[0]
            if main_text.tag == RDFNS('RDF'):
                main_text = None

        if main_text is not None:
            for chunk_xml in chop(main_text):
                empty = False
                if sample is not None:
                    if sample <= 0:
                        empty = True
                    else:
                        sample -= len(chunk_xml.xpath('//strofa|//akap|//akap_cd|//akap_dialog'))
                chunk_html, chunk_toc, chunk_chars = transform_chunk(chunk_xml, chunk_counter, annotations, empty)

                toc.extend(chunk_toc)
                chars = chars.union(chunk_chars)
                zip.writestr('OPS/part%d.html' % chunk_counter, chunk_html)
                add_to_manifest(manifest, chunk_counter)
                add_to_spine(spine, chunk_counter)
                chunk_counter += 1

        for child in wldoc.parts():
            child_toc, chunk_counter, chunk_chars, sample = transform_file(
                child, chunk_counter, first=False, sample=sample)
            toc.append(child_toc)
            chars = chars.union(chunk_chars)

        return toc, chunk_counter, chars, sample

    document = deepcopy(wldoc)
    del wldoc

    if flags:
        for flag in flags:
            document.edoc.getroot().set(flag, 'yes')

    document.clean_ed_note()
    document.clean_ed_note('abstrakt')

    # add editors info
    editors = document.editors()
    if editors:
        document.edoc.getroot().set('editors', u', '.join(sorted(
            editor.readable() for editor in editors)))
    if document.book_info.funders:
        document.edoc.getroot().set('funders', u', '.join(
            document.book_info.funders))
    if document.book_info.thanks:
        document.edoc.getroot().set('thanks', document.book_info.thanks)

    opf = xslt(document.book_info.to_etree(), get_resource('epub/xsltContent.xsl'))
    manifest = opf.find('.//' + OPFNS('manifest'))
    guide = opf.find('.//' + OPFNS('guide'))
    spine = opf.find('.//' + OPFNS('spine'))

    output_file = NamedTemporaryFile(prefix='librarian', suffix='.epub', delete=False)
    zip = zipfile.ZipFile(output_file, 'w', zipfile.ZIP_DEFLATED)

    functions.reg_mathml_epub(zip)

    if os.path.isdir(ilustr_path):
        for i, filename in enumerate(os.listdir(ilustr_path)):
            file_path = os.path.join(ilustr_path, filename)
            zip.write(file_path, os.path.join('OPS', filename))
            image_id = 'image%s' % i
            manifest.append(etree.fromstring(
                '<item id="%s" href="%s" media-type="%s" />' % (image_id, filename, guess_type(file_path)[0])))

    # write static elements
    mime = zipfile.ZipInfo()
    mime.filename = 'mimetype'
    mime.compress_type = zipfile.ZIP_STORED
    mime.extra = ''
    zip.writestr(mime, 'application/epub+zip')
    zip.writestr(
        'META-INF/container.xml',
        '<?xml version="1.0" ?>'
        '<container version="1.0" '
        'xmlns="urn:oasis:names:tc:opendocument:xmlns:container">'
        '<rootfiles><rootfile full-path="OPS/content.opf" '
        'media-type="application/oebps-package+xml" />'
        '</rootfiles></container>'
    )
    zip.write(get_resource('res/wl-logo-small.png'),
              os.path.join('OPS', 'logo_wolnelektury.png'))
    zip.write(get_resource('res/jedenprocent.png'),
              os.path.join('OPS', 'jedenprocent.png'))
    if not style:
        style = get_resource('epub/style.css')
    zip.write(style, os.path.join('OPS', 'style.css'))

    if cover:
        if cover is True:
            cover = make_cover

        cover_file = StringIO()
        bound_cover = cover(document.book_info)
        bound_cover.save(cover_file)
        cover_name = 'cover.%s' % bound_cover.ext()
        zip.writestr(os.path.join('OPS', cover_name), cover_file.getvalue())
        del cover_file

        cover_tree = etree.parse(get_resource('epub/cover.html'))
        cover_tree.find('//' + XHTMLNS('img')).set('src', cover_name)
        zip.writestr('OPS/cover.html', etree.tostring(
            cover_tree, pretty_print=True, xml_declaration=True,
            encoding="utf-8",
            doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ' +
                    '"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
        ))

        if bound_cover.uses_dc_cover:
            if document.book_info.cover_by:
                document.edoc.getroot().set('data-cover-by', document.book_info.cover_by)
            if document.book_info.cover_source:
                document.edoc.getroot().set('data-cover-source', document.book_info.cover_source)

        manifest.append(etree.fromstring(
            '<item id="cover" href="cover.html" media-type="application/xhtml+xml" />'))
        manifest.append(etree.fromstring(
            '<item id="cover-image" href="%s" media-type="%s" />' % (cover_name, bound_cover.mime_type())))
        spine.insert(0, etree.fromstring('<itemref idref="cover"/>'))
        opf.getroot()[0].append(etree.fromstring('<meta name="cover" content="cover-image"/>'))
        guide.append(etree.fromstring('<reference href="cover.html" type="cover" title="Okładka"/>'))

    annotations = etree.Element('annotations')

    toc_file = etree.fromstring(
        '<?xml version="1.0" encoding="utf-8"?><!DOCTYPE ncx PUBLIC '
        '"-//NISO//DTD ncx 2005-1//EN" '
        '"http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">'
        '<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" xml:lang="pl" '
        'version="2005-1"><head></head><docTitle></docTitle><navMap>'
        '</navMap></ncx>'
    )
    nav_map = toc_file[-1]

    if html_toc:
        manifest.append(etree.fromstring(
            '<item id="html_toc" href="toc.html" media-type="application/xhtml+xml" />'))
        spine.append(etree.fromstring(
            '<itemref idref="html_toc" />'))
        guide.append(etree.fromstring('<reference href="toc.html" type="toc" title="Spis treści"/>'))

    toc, chunk_counter, chars, sample = transform_file(document, sample=sample)

    if len(toc.children) < 2:
        toc.add(u"Początek utworu", "part1.html")

    # Last modifications in container files and EPUB creation
    if len(annotations) > 0:
        toc.add("Przypisy", "annotations.html")
        manifest.append(etree.fromstring(
            '<item id="annotations" href="annotations.html" media-type="application/xhtml+xml" />'))
        spine.append(etree.fromstring(
            '<itemref idref="annotations" />'))
        replace_by_verse(annotations)
        html_tree = xslt(annotations, get_resource('epub/xsltAnnotations.xsl'))
        chars = chars.union(used_chars(html_tree.getroot()))
        zip.writestr('OPS/annotations.html', etree.tostring(
            html_tree, pretty_print=True, xml_declaration=True,
            encoding="utf-8",
            doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ' +
                    '"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
        ))

    toc.add("Wesprzyj Wolne Lektury", "support.html")
    manifest.append(etree.fromstring(
        '<item id="support" href="support.html" media-type="application/xhtml+xml" />'))
    spine.append(etree.fromstring(
        '<itemref idref="support" />'))
    html_string = open(get_resource('epub/support.html')).read()
    chars.update(used_chars(etree.fromstring(html_string)))
    zip.writestr('OPS/support.html', html_string)

    toc.add("Strona redakcyjna", "last.html")
    manifest.append(etree.fromstring(
        '<item id="last" href="last.html" media-type="application/xhtml+xml" />'))
    spine.append(etree.fromstring(
        '<itemref idref="last" />'))
    html_tree = xslt(document.edoc, get_resource('epub/xsltLast.xsl'), outputtype=output_type)
    chars.update(used_chars(html_tree.getroot()))
    zip.writestr('OPS/last.html', etree.tostring(
        html_tree, pretty_print=True, xml_declaration=True,
        encoding="utf-8",
        doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" ' +
                '"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
    ))

    if not flags or 'without-fonts' not in flags:
        # strip fonts
        tmpdir = mkdtemp('-librarian-epub')
        try:
            cwd = os.getcwd()
        except OSError:
            cwd = None

        os.chdir(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'font-optimizer'))
        for fname in 'DejaVuSerif.ttf', 'DejaVuSerif-Bold.ttf', 'DejaVuSerif-Italic.ttf', 'DejaVuSerif-BoldItalic.ttf':
            optimizer_call = ['perl', 'subset.pl', '--chars',
                              ''.join(chars).encode('utf-8'),
                              get_resource('fonts/' + fname),
                              os.path.join(tmpdir, fname)]
            env = {"PERL_USE_UNSAFE_INC": "1"}
            if verbose:
                print "Running font-optimizer"
                subprocess.check_call(optimizer_call, env=env)
            else:
                dev_null = open(os.devnull, 'w')
                subprocess.check_call(optimizer_call, stdout=dev_null, stderr=dev_null, env=env)
            zip.write(os.path.join(tmpdir, fname), os.path.join('OPS', fname))
            manifest.append(etree.fromstring(
                '<item id="%s" href="%s" media-type="application/x-font-truetype" />' % (fname, fname)))
        rmtree(tmpdir)
        if cwd is not None:
            os.chdir(cwd)
    zip.writestr('OPS/content.opf', etree.tostring(opf, pretty_print=True,
                 xml_declaration=True, encoding="utf-8"))
    title = document.book_info.title
    attributes = "dtb:uid", "dtb:depth", "dtb:totalPageCount", "dtb:maxPageNumber"
    for st in attributes:
        meta = toc_file.makeelement(NCXNS('meta'))
        meta.set('name', st)
        meta.set('content', '0')
        toc_file[0].append(meta)
    toc_file[0][0].set('content', str(document.book_info.url))
    toc_file[0][1].set('content', str(toc.depth()))
    set_inner_xml(toc_file[1], ''.join(('<text>', title, '</text>')))

    # write TOC
    if html_toc:
        toc.add(u"Spis treści", "toc.html", index=1)
        zip.writestr('OPS/toc.html', toc.html().encode('utf-8'))
    toc.write_to_xml(nav_map)
    zip.writestr('OPS/toc.ncx', etree.tostring(toc_file, pretty_print=True,
                 xml_declaration=True, encoding="utf-8"))
    zip.close()

    return OutputFile.from_filename(output_file.name)