def save_zen(request, project, subproject, lang):
    '''
    Save handler for zen mode.
    '''
    translation = get_translation(request, project, subproject, lang)
    user_locked = translation.is_user_locked(request.user)

    form = TranslationForm(translation, None, request.POST)
    if not can_translate(request.user, translation):
        messages.error(
            request,
            _('You don\'t have privileges to save translations!')
        )
    elif not form.is_valid():
        messages.error(request, _('Failed to save translation!'))
    elif not user_locked:
        unit = form.cleaned_data['unit']

        perform_translation(unit, form, request)

    return render(
        request,
        'zen-response.html',
        {},
    )

def show_engage(request, project, lang=None):
    # Get project object, skipping ACL
    obj = get_project(request, project, skip_acl=True)

    # Handle language parameter
    if lang is not None:
        language = Language.objects.try_get(code=lang)
    else:
        language = None
    if language:
        try_set_language(lang)
        stats_obj = obj.stats.get_single_language_stats(language)
    else:
        stats_obj = obj.stats

    return render(
        request,
        'engage.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj,
            'languages': stats_obj.languages,
            'total': obj.stats.source_strings,
            'percent': stats_obj.translated_percent,
            'language': language,
            'title': _('Get involved in {0}!').format(obj),
        }
    )

def zen(request, project, subproject, lang):
    """Generic entry point for translating, suggesting and searching."""
    translation = get_translation(request, project, subproject, lang)
    search_result, unitdata = get_zen_unitdata(translation, request)

    # Handle redirects
    if isinstance(search_result, HttpResponse):
        return search_result

    return render(
        request,
        'zen.html',
        {
            'object': translation,
            'project': translation.subproject.project,
            'unitdata': unitdata,
            'search_query': search_result['query'],
            'filter_name': search_result['name'],
            'filter_count': len(search_result['ids']),
            'last_section': search_result['last_section'],
            'search_url': search_result['url'],
            'offset': search_result['offset'],
            'search_form': search_result['form'].reset_offset(),
            'update_lock': translation.lock_user == request.user,
        }
    )

def show_engage(request, project, lang=None):
    # Get project object, skipping ACL
    obj = get_project(request, project, skip_acl=True)

    # Handle language parameter
    if lang is not None:
        language = get_object_or_404(Language, code=lang)
    else:
        language = None
    full_stats = obj.stats
    if language:
        try_set_language(lang)
        stats_obj = full_stats.get_single_language_stats(language)
    else:
        stats_obj = full_stats

    return render(
        request,
        'engage.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj,
            'full_stats': full_stats,
            'languages': stats_obj.languages,
            'total': obj.stats.source_strings,
            'percent': stats_obj.translated_percent,
            'language': language,
            'project_link': mark_safe('<a href="{}">{}</a>'.format(
                escape(obj.get_absolute_url()), escape(obj.name)
            )),
            'title': _('Get involved in {0}!').format(obj),
        }
    )

def change_component(request, project, component):
    obj = get_component(request, project, component)

    if not request.user.has_perm('component.edit', obj):
        raise Http404()

    if request.method == 'POST':
        form = ComponentSettingsForm(request.POST, instance=obj)
        if form.is_valid():
            form.save()
            messages.success(request, _('Settings saved'))
            return redirect(
                'settings', project=obj.project.slug, component=obj.slug
            )
        else:
            messages.error(
                request,
                _('Invalid settings, please check the form for errors!')
            )
    else:
        form = ComponentSettingsForm(instance=obj)

    return render(
        request,
        'component-settings.html',
        {
            'project': obj.project,
            'object': obj,
            'form': form,
        }
    )

def zen(request, project, subproject, lang):
    '''
    Generic entry point for translating, suggesting and searching.
    '''
    translation = get_translation(request, project, subproject, lang)
    search_result, unitdata = get_zen_unitdata(translation, request)

    # Handle redirects
    if isinstance(search_result, HttpResponse):
        return search_result

    return render(
        request,
        'zen.html',
        {
            'object': translation,
            'project': translation.subproject.project,
            'unitdata': unitdata,
            'search_query': search_result['query'],
            'filter_name': search_result['name'],
            'filter_count': len(search_result['ids']),
            'last_section': search_result['last_section'],
            'search_id': search_result['search_id'],
            'offset': search_result['offset'],
        }
    )

def show_subproject(request, project, subproject):
    obj = get_subproject(request, project, subproject)

    last_changes = Change.objects.prefetch().filter(
        translation__subproject=obj
    )[:10]

    new_lang_form = get_new_language_form(request, obj)(obj)

    return render(
        request,
        'subproject.html',
        {
            'object': obj,
            'project': obj.project,
            'translations': sort_objects(obj.translation_set.enabled()),
            'show_language': 1,
            'reports_form': ReportsForm(),
            'last_changes': last_changes,
            'last_changes_url': urlencode(
                {'subproject': obj.slug, 'project': obj.project.slug}
            ),
            'new_lang_form': new_lang_form,
        }
    )

def zen(request, project, subproject, lang):
    """
    Generic entry point for translating, suggesting and searching.
    """
    translation = get_translation(request, project, subproject, lang)
    search_result, unitdata = get_zen_unitdata(translation, request)

    # Handle redirects
    if isinstance(search_result, HttpResponse):
        return search_result

    return render(
        request,
        "zen.html",
        {
            "object": translation,
            "project": translation.subproject.project,
            "unitdata": unitdata,
            "search_query": search_result["query"],
            "filter_name": search_result["name"],
            "filter_count": len(search_result["ids"]),
            "last_section": search_result["last_section"],
            "search_id": search_result["search_id"],
            "offset": search_result["offset"],
        },
    )

def show_project(request, project):
    obj = get_project(request, project)
    user = request.user

    dict_langs = Language.objects.filter(
        dictionary__project=obj
    ).annotate(Count('dictionary'))

    last_changes = Change.objects.prefetch().filter(project=obj)[:10]

    language_stats = sort_unicode(
        obj.stats.get_language_stats(), lambda x: force_text(x.language.name)
    )

    # Paginate components of project.
    all_components = obj.component_set.select_related()
    components = prefetch_stats(get_paginator(
        request, all_components
    ))

    return render(
        request,
        'project.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj,
            'dicts': dict_langs,
            'last_changes': last_changes,
            'last_changes_url': urlencode(
                {'project': obj.slug}
            ),
            'language_stats': language_stats,
            'language_count': Language.objects.filter(
                translation__component__project=obj
            ).distinct().count(),
            'search_form': SearchForm(),
            'whiteboard_form': optional_form(
                WhiteboardForm, user, 'project.edit', obj
            ),
            'delete_form': optional_form(
                DeleteForm, user, 'project.edit', obj, obj=obj
            ),
            'rename_form': optional_form(
                ProjectRenameForm, user, 'project.edit', obj,
                request=request, instance=obj
            ),
            'replace_form': optional_form(ReplaceForm, user, 'unit.edit', obj),
            'bulk_state_form': optional_form(
                BulkStateForm, user, 'translation.auto', obj,
                user=user, obj=obj
            ),
            'components': components,
            'licenses': ', '.join(
                sorted({x.license for x in all_components if x.license})
            ),
        }
    )

def show_engage(request, project, lang=None):
    # Get project object, skipping ACL
    obj = get_project(request, project, skip_acl=True)

    # Handle language parameter
    if lang is not None:
        language = Language.objects.try_get(code=lang)
    else:
        language = None
    if language:
        try_set_language(lang)
        stats_obj = obj.stats.get_single_language_stats(language)
    else:
        stats_obj = obj.stats
    percent = stats_obj.translated_percent

    languages = obj.get_language_count()

    context = {
        'allow_index': True,
        'object': obj,
        'project': obj,
        'languages': languages,
        'total': obj.stats.source_strings,
        'percent': percent,
        'url': obj.get_absolute_url(),
        'lang_url': obj.get_absolute_url() + '#languages',
        'language': language,
        'title': _('Get involved in {0}!').format(obj),
    }

    # Render text
    if language is None:
        status_text = _(
            '<a href="%(url)s">Translation project for %(project)s</a> '
            'currently contains %(total)s strings for translation and is '
            '<a href="%(lang_url)s">being translated into %(languages)s '
            'languages</a>. Overall, these translations are %(percent)s%% '
            'complete.'
        )
    else:
        # Translators: line of text in engagement page, please use your
        # language name instead of English
        status_text = _('<a href="%(url)s">Translation project for '
                        '%(project)s</a> into English currently contains '
                        '%(total)s strings for translation and is '
                        '%(percent)s%% complete.')
        if 'English' in status_text:
            status_text = status_text.replace('English', language.name)

    context['status_text'] = mark_safe(status_text % context)

    return render(
        request,
        'engage.html',
        context
    )

def bad_request(request, exception=None):
    """Error handler for bad request."""
    return render(
        request,
        '400.html',
        {
            'title': _('Bad Request'),
        },
        status=400
    )

def data_root(request):
    return render(
        request,
        'data-root.html',
        {
            'hooks_docs': weblate.get_doc_url('api', 'hooks'),
            'api_docs': weblate.get_doc_url('api'),
            'rss_docs': weblate.get_doc_url('api', 'rss'),
        }
    )

def not_found(request, exception=None):
    """Error handler showing list of available projects."""
    return render(
        request,
        '404.html',
        {
            'title': _('Page Not Found'),
        },
        status=404
    )

def data_project(request, project):
    obj = get_project(request, project)
    return render(
        request,
        'data.html',
        {
            'object': obj,
            'project': obj,
        }
    )

def denied(request, exception=None):
    """Error handler showing list of available projects."""
    return render(
        request,
        '403.html',
        {
            'title': _('Permission Denied'),
        },
        status=403
    )

def show_component_list(request, name):
    obj = get_object_or_404(ComponentList, slug=name)

    return render(
        request,
        'component-list.html',
        {
            'object': obj,
        }
    )

def new_language(request, project, component):
    obj = get_component(request, project, component)

    form_class = get_new_language_form(request, obj)
    can_add = obj.can_add_new_language(request)

    if request.method == 'POST':
        form = form_class(obj, request.POST)

        if form.is_valid():
            langs = form.cleaned_data['lang']
            kwargs = {
                'user': request.user,
                'author': request.user,
                'component': obj,
                'details': {},
            }
            for language in Language.objects.filter(code__in=langs):
                kwargs['details']['language'] = language.code
                if can_add:
                    obj.add_new_language(language, request)
                    Change.objects.create(
                        action=Change.ACTION_ADDED_LANGUAGE,
                        **kwargs
                    )
                elif obj.new_lang == 'contact':
                    Change.objects.create(
                        action=Change.ACTION_REQUESTED_LANGUAGE,
                        **kwargs
                    )
                    messages.success(
                        request,
                        _(
                            "A request for a new translation has been "
                            "sent to the project's maintainers."
                        )
                    )
            return redirect(obj)
        messages.error(
            request,
            _('Please fix errors in the form.')
        )
    else:
        form = form_class(obj)

    return render(
        request,
        'new-language.html',
        {
            'object': obj,
            'project': obj.project,
            'form': form,
            'can_add': can_add,
        }
    )

def not_found(request):
    """Error handler showing list of available projects."""
    return render(
        request,
        '404.html',
        {
            'request_path': request.path,
            'title': _('Page Not Found'),
        },
        status=404
    )

def about(request):
    """Show about page with version information."""
    return render(
        request,
        'about.html',
        {
            'title': _('About Weblate'),
            'versions': get_versions() + get_optional_versions(),
            'allow_index': True,
        }
    )

def list_projects(request):
    """Lists all projects"""

    return render(
        request,
        'projects.html',
        {
            'projects': Project.objects.all_acl(request.user),
            'title': _('Projects'),
        }
    )