# 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/>.

"""

HTML views

~~~~~~~~~~

Special views

`````````````

.. autoclass:: NullView

.. autoclass:: NoResultView

.. autoclass:: FinalView

Base entity views

`````````````````

.. autoclass:: InContextView

.. autoclass:: OutOfContextView

.. autoclass:: OneLineView

Those are used to display a link to an entity, whose label depends on the entity

having to be displayed in or out of context (of another entity): some entities

make sense in the context of another entity. For instance, the `Version` of a

`Project` in forge. So one may expect that 'incontext' will be called when

display a version from within the context of a project, while 'outofcontext"'

will be called in other cases. In our example, the 'incontext' view of the

version would be something like '0.1.2', while the 'outofcontext' view would

include the project name, e.g. 'baz 0.1.2' (since only a version number without

the associated project doesn't make sense if you don't know yet that you're

talking about the famous 'baz' project. |cubicweb| tries to make guess and call

'incontext'/'outofcontext' nicely. When it can't know, the 'oneline' view should

be used.

List entity views

`````````````````

.. autoclass:: ListView

.. autoclass:: SimpleListView

.. autoclass:: SameETypeListView

.. autoclass:: CSVView

Those list views can be given a 'subvid' arguments, telling the view to use of

each item in the list. When not specified, the value of the 'redirect_vid'

attribute of :class:`ListItemView` (for 'listview') or of

:class:`SimpleListView` will be used. This default to 'outofcontext' for 'list'

/ 'incontext' for 'simplelist'

Text entity views

~~~~~~~~~~~~~~~~~

Basic HTML view have some variants to be used when generating raw text, not HTML

(for notifications for instance). Also, as explained above, some of the HTML

views use those text views as a basis.

.. autoclass:: TextView

.. autoclass:: InContextTextView

.. autoclass:: OutOfContextView

"""

__docformat__ = "restructuredtext en"

_ = unicode

from datetime import timedelta

from warnings import warn

from rql import nodes

from logilab.mtconverter import TransformError, xml_escape

from logilab.common.registry import yes

from cubicweb import NoSelectableObject, tags

from cubicweb.predicates import empty_rset, one_etype_rset, match_kwargs

from cubicweb.schema import display_name

from cubicweb.view import EntityView, AnyRsetView, View

from cubicweb.uilib import cut

from cubicweb.web.views import calendar

class NullView(AnyRsetView):

    """:__regid__: *null*

    This view is the default view used when nothing needs to be rendered. It is

    always applicable and is usually used as fallback view when calling

    :meth:`_cw.view` to display nothing if the result set is empty.

    """

    __regid__ = 'null'

    __select__ = yes()

    def call(self, **kwargs):

        pass

    cell_call = call

class NoResultView(View):

    """:__regid__: *noresult*

    This view is the default view to be used when no result has been found

    (i.e. empty result set).

    It's usually used as fallback view when calling :meth:`_cw.view` to display

    "no results" if the result set is empty.

    """

    __regid__ = 'noresult'

    __select__ = empty_rset()

    def call(self, **kwargs):

        self.w(u'<div class="searchMessage"><strong>%s</strong></div>\n'

               % self._cw._('No result matching query'))

class FinalView(AnyRsetView):

    """:__regid__: *final*

    Display the value of a result set cell with minimal transformations

    (i.e. you'll get a number for entities). It is applicable on any result set,

    though usually dedicated for cells containing an attribute's value.

    """

    __regid__ = 'final'

    def cell_call(self, row, col, props=None, format='text/html'):

        value = self.cw_rset.rows[row][col]

        if value is None:

            self.w(u'')

            return

        etype = self.cw_rset.description[row][col]

        if etype == 'String':

            entity, rtype = self.cw_rset.related_entity(row, col)

            if entity is not None:

                # call entity's printable_value which may have more information

                # about string format & all

                self.w(entity.printable_value(rtype, value, format=format))

                return

        value = self._cw.printable_value(etype, value, props)

        if etype in ('Time', 'Interval'):

            self.w(value.replace(' ', ' '))

        else:

            self.wdata(value)

class InContextView(EntityView):

    """:__regid__: *incontext*

    This view is used whenthe entity should be considered as displayed in its

    context. By default it produces the result of ``entity.dc_title()`` wrapped in a

    link leading to the primary view of the entity.

    """

    __regid__ = 'incontext'

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(row, col)

        desc = cut(entity.dc_description(), 50)

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

            xml_escape(entity.absolute_url()), xml_escape(desc),

            xml_escape(entity.dc_title())))

class OutOfContextView(EntityView):

    """:__regid__: *outofcontext*

    This view is used when the entity should be considered as displayed out of

    """

    __regid__ = 'outofcontext'

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(row, col)

        desc = cut(entity.dc_description(), 50)

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

            xml_escape(entity.absolute_url()), xml_escape(desc),

            xml_escape(entity.dc_long_title())))

class OneLineView(EntityView):

    """:__regid__: *oneline*

    This view is used when we can't tell if the entity should be considered as

    displayed in or out of context. By default it produces the result of the

    `text` view in a link leading to the primary view of the entity.

    """

    __regid__ = 'oneline'

    title = _('oneline')

    def cell_call(self, row, col, **kwargs):

        """the one line view for an entity: linked text view

        """

        entity = self.cw_rset.get_entity(row, col)

        desc = cut(entity.dc_description(), 50)

        title = cut(entity.dc_title(),

                    self._cw.property_value('navigation.short-line-size'))

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

                xml_escape(entity.absolute_url()), xml_escape(desc),

                xml_escape(title)))

# text views ###################################################################

class TextView(EntityView):

    """:__regid__: *text*

    This is the simplest text view for an entity. By default it returns the

    result of the entity's `dc_title()` method, which is cut to fit the

    `navigation.short-line-size` property if necessary.

    """

    __regid__ = 'text'

    title = _('text')

    content_type = 'text/plain'

    def call(self, **kwargs):

        """The view is called for an entire result set, by default loop other

        rows of the result set and call the same view on the particular row.

        Subclasses views that are applicable on None result sets will have to

        override this method.

        """

        rset = self.cw_rset

        if rset is None:

            raise NotImplementedError, self

        for i in xrange(len(rset)):

            self.wview(self.__regid__, rset, row=i, **kwargs)

            if len(rset) > 1:

                self.w(u"\n")

    def cell_call(self, row, col=0, **kwargs):

        entity = self.cw_rset.get_entity(row, col)

        self.w(cut(entity.dc_title(),

                   self._cw.property_value('navigation.short-line-size')))

class InContextTextView(TextView):

    """:__regid__: *textincontext*

    Similar to the `text` view, but called when an entity is considered in

    context (see description of incontext HTML view for more information on

    this). By default it displays what's returned by the `dc_title()` method of

    the entity.

    """

    __regid__ = 'textincontext'

    title = None # not listed as a possible view

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(row, col)

        self.w(entity.dc_title())

class OutOfContextTextView(InContextTextView):

    """:__regid__: *textoutofcontext*

    Similar to the `text` view, but called when an entity is considered out of

    context (see description of outofcontext HTML view for more information on

    this). By default it displays what's returned by the `dc_long_title()`

    method of the entity.

    """

    __regid__ = 'textoutofcontext'

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(row, col)

        self.w(entity.dc_long_title())

# list views ##################################################################

class ListView(EntityView):

    """:__regid__: *list*

    This view displays a list of entities by creating a HTML list (`<ul>`) and

    call the view `listitem` for each entity of the result set. The 'list' view

    will generate HTML like:

    .. sourcecode:: html

      <ul class="section">

        <li>"result of 'subvid' view for a row</li>

        ...

      </ul>

    If you wish to use a different view for each entity, either subclass and

    change the :attr:`item_vid` class attribute or specify a `subvid` argument

    when calling this view.

    """

    __regid__ = 'list'

    title = _('list')

    item_vid = 'listitem'

    def call(self, klass=None, title=None, subvid=None, listid=None, **kwargs):

        """display a list of entities by calling their <item_vid> view

        :param listid: the DOM id to use for the root element

        """

        # XXX much of the behaviour here should probably be outside this view

        if subvid is None and 'subvid' in self._cw.form:

            subvid = self._cw.form.pop('subvid') # consume it

        if listid:

            listid = u' id="%s"' % listid

        else:

            listid = u''

        if title:

            self.w(u'<div%s class="%s"><h4>%s</h4>\n' % (listid, klass or 'section', title))

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

        else:

            self.w(u'<ul%s class="%s">\n' % (listid, klass or 'section'))

        for i in xrange(self.cw_rset.rowcount):

            self.cell_call(row=i, col=0, vid=subvid, **kwargs)

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

        if title:

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

    def cell_call(self, row, col=0, vid=None, **kwargs):

        self.w(u'<li>')

        self.wview(self.item_vid, self.cw_rset, row=row, col=col, vid=vid, **kwargs)

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

class ListItemView(EntityView):

    __regid__ = 'listitem'

    @property

    def redirect_vid(self):

        if self._cw.search_state[0] == 'normal':

            return 'outofcontext'

        return 'outofcontext-search'

    def cell_call(self, row, col, vid=None, **kwargs):

        if not vid:

            vid = self.redirect_vid

        try:

            self.wview(vid, self.cw_rset, row=row, col=col, **kwargs)

        except NoSelectableObject:

            if vid == self.redirect_vid:

                raise

            self.wview(self.redirect_vid, self.cw_rset, row=row, col=col, **kwargs)

class SimpleListView(ListItemView):

    """:__regid__: *simplelist*

    Similar to :class:~cubicweb.web.views.baseviews.ListView but using '<div>'

    instead of '<ul>'. It rely on '<div>' behaviour to separate items. HTML will

    look like

    .. sourcecode:: html

      <div class="section">"result of 'subvid' view for a row</div>

      ...

    It relies on base :class:`~cubicweb.view.View` class implementation of the

    :meth:`call` method to insert those <div>.

    """

    __regid__ = 'simplelist'

    redirect_vid = 'incontext'

    def call(self, subvid=None, **kwargs):

        """display a list of entities by calling their <item_vid> view

        :param listid: the DOM id to use for the root element

        """

        if subvid is None and 'vid' in kwargs:

            warn("should give a 'subvid' argument instead of 'vid'",

                 DeprecationWarning, stacklevel=2)

        else:

            kwargs['vid'] = subvid

        return super(SimpleListView, self).call(**kwargs)

class SameETypeListView(EntityView):

    """:__regid__: *sameetypelist*

    This view displays a list of entities of the same type, in HTML section

    ('<div>') and call the view `sameetypelistitem` for each entity of the

    result set. It's designed to get a more adapted global list when displayed

    entities are all of the same type (for instance, display gallery if there

    are only images entities).

    """

    __regid__ = 'sameetypelist'

    __select__ = EntityView.__select__ & one_etype_rset()

    item_vid = 'sameetypelistitem'

    @property

    def title(self):

        etype = iter(self.cw_rset.column_types(0)).next()

        return display_name(self._cw, etype, form='plural')

    def call(self, **kwargs):

        """display a list of entities by calling their <item_vid> view"""

        showtitle = kwargs.pop('showtitle', not 'vtitle' in self._cw.form)

        if showtitle:

            self.w(u'<h1>%s</h1>' % self.title)