# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""inline help system, rendering ReST files in the `wdoc` subdirectory of

CubicWeb and cubes

"""

__docformat__ = "restructuredtext en"

from itertools import chain

from os.path import join

from bisect import bisect_right

from datetime import date

from logilab.common.changelog import ChangeLog

from logilab.common.date import strptime, todate

from logilab.common.registry import yes

from logilab.mtconverter import CHARSET_DECL_RGX

from cubicweb.predicates import match_form_params

from cubicweb.view import StartupView

from cubicweb.uilib import rest_publish

from cubicweb.web import NotFound, action

from cubicweb import _

# table of content management #################################################

try:

    from xml.etree.ElementTree import parse

except ImportError:

    from elementtree.ElementTree import parse

def build_toc_index(node, index):

    try:

        nodeidx = node.attrib['resource']

        assert not nodeidx in index, nodeidx

        index[nodeidx] = node

    except KeyError:

        pass

    for child in node:

        build_toc_index(child, index)

        child.parent = node

def get_insertion_point(section, index):

    if section.attrib.get('insertafter'):

        snode = index[section.attrib['insertafter']]

        node = snode.parent

        idx = node.getchildren().index(snode) + 1

    elif section.attrib.get('insertbefore'):

        snode = index[section.attrib['insertbefore']]

        node = snode.parent

        idx = node.getchildren().index(snode)

    elif 'appendto' in section.attrib:

        node = index[section.attrib['appendto']]

        idx = None

    else:

        node, idx = None, None

    return node, idx

def build_toc(config):

    alltocfiles = reversed(tuple(config.locate_all_files('toc.xml')))

    maintoc = parse(next(alltocfiles)).getroot()

    maintoc.parent = None

    index = {}

    build_toc_index(maintoc, index)

    # insert component documentation into the tree according to their toc.xml

    # file

    for fpath in alltocfiles:

        toc = parse(fpath).getroot()

        for section in toc:

            node, idx = get_insertion_point(section, index)

            if node is None:

                continue

            if idx is None:

                node.append(section)

            else:

                node.insert(idx, section)

            section.parent = node

            build_toc_index(section, index)

    return index

def title_for_lang(node, lang):

    fallback_title = None

    for title in node.findall('title'):

        title_lang = title.attrib['{http://www.w3.org/XML/1998/namespace}lang']

        if title_lang == lang:

            return unicode(title.text)

        if title_lang == 'en':

            fallback_title = unicode(title.text)

    return fallback_title

def subsections(node):

    return [child for child in node if child.tag == 'section']

# help views ##################################################################

class InlineHelpView(StartupView):

    __select__ = match_form_params('fid')

    __regid__ = 'wdoc'

    title = _('site documentation')

    def call(self):

        fid = self._cw.form['fid']

        vreg = self._cw.vreg

        for lang in chain((self._cw.lang, vreg.property_value('ui.language')),

                          vreg.config.available_languages()):

            rid = '%s_%s.rst' % (fid, lang)

            resourcedir = vreg.config.locate_doc_file(rid)

            if resourcedir:

                break

        else:

            raise NotFound

        self.tocindex = build_toc(vreg.config)

        try:

            node = self.tocindex[fid]

        except KeyError:

            node = None

        else:

            self.navigation_links(node)

            self.w(u'<div class="hr"></div>')

            self.w(u'<h1>%s</h1>' % (title_for_lang(node, self._cw.lang)))

        data = open(join(resourcedir, rid)).read()

        self.w(rest_publish(self, data))

        if node is not None:

            self.subsections_links(node)

            self.w(u'<div class="hr"></div>')

            self.navigation_links(node)

    def navigation_links(self, node):

        req = self._cw

        parent = node.parent

        if parent is None:

            return

        brothers = subsections(parent)

        self.w(u'<div class="docnav">\n')

        previousidx = brothers.index(node) - 1

        if previousidx >= 0:

            self.navsection(brothers[previousidx], 'prev')

        self.navsection(parent, 'up')

        nextidx = brothers.index(node) + 1

        if nextidx < len(brothers):

            self.navsection(brothers[nextidx], 'next')

        self.w(u'</div>\n')

    navinfo = {'prev': ('', 'data/previous.png', _('i18nprevnext_previous')),

               'next': ('', 'data/next.png', _('i18nprevnext_next')),

               'up': ('', 'data/up.png', _('i18nprevnext_up'))}

    def navsection(self, node, navtype):

        htmlclass, imgpath, msgid = self.navinfo[navtype]

        self.w(u'<span class="%s">' % htmlclass)

        self.w(u'%s : ' % self._cw._(msgid))

        self.w(u'<a href="%s">%s</a>' % (

            self._cw.build_url('doc/'+node.attrib['resource']),

            title_for_lang(node, self._cw.lang)))

        self.w(u'</span>\n')

    def subsections_links(self, node, first=True):

        sub = subsections(node)

        if not sub:

            return

        if first:

            self.w(u'<div class="hr"></div>')

        self.w(u'<ul class="docsum">')

        for child in sub:

            self.w(u'<li><a href="%s">%s</a>' % (

                self._cw.build_url('doc/'+child.attrib['resource']),

                title_for_lang(child, self._cw.lang)))

            self.subsections_links(child, False)

            self.w(u'</li>')

        self.w(u'</ul>\n')

class InlineHelpImageView(StartupView):

    __regid__ = 'wdocimages'

    __select__ = match_form_params('fid')

    binary = True

    templatable = False

    content_type = 'image/png'

    def call(self):

        fid = self._cw.form['fid']

        for lang in chain((self._cw.lang, self._cw.vreg.property_value('ui.language')),

                          self._cw.vreg.config.available_languages()):

            rid = join('images', '%s_%s.png' % (fid, lang))

            resourcedir = self._cw.vreg.config.locate_doc_file(rid)

            if resourcedir:

                break

        else:

            raise NotFound

        self.w(open(join(resourcedir, rid)).read())

class HelpAction(action.Action):

    __regid__ = 'help'

    __select__ = yes()

    category = 'footer'

    order = 0

    title = _('Help')

    def url(self):

        return self._cw.build_url('doc/main')

class AboutAction(action.Action):

    __regid__ = 'about'

    __select__ = yes()

    category = 'footer'

    order = 2

    title = _('About this site')

    def url(self):

        return self._cw.build_url('doc/about')