# 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/>.

"""

Public API of the PrimaryView class

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

.. autoclass:: cubicweb.web.views.primary.PrimaryView

Views that may be used to display an entity's attribute or relation

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

Yoy may easily the display of an attribute or relation by simply configuring the

view using one of `primaryview_display_ctrl` or `reledit_ctrl` to use one of the

views describled below. For instance:

.. sourcecode:: python

    primaryview_display_ctrl.tag_attribute(('Foo', 'bar'), {'vid': 'attribute'})

.. autoclass:: AttributeView

.. autoclass:: URLAttributeView

.. autoclass:: VerbatimAttributeView

"""

__docformat__ = "restructuredtext en"

_ = unicode

from warnings import warn

from logilab.common.deprecation import deprecated

from logilab.mtconverter import xml_escape

from cubicweb import Unauthorized, NoSelectableObject

from cubicweb.utils import support_args

from cubicweb.predicates import match_kwargs, match_context

from cubicweb.view import EntityView

from cubicweb.schema import META_RTYPES, VIRTUAL_RTYPES, display_name

from cubicweb.web import component

from cubicweb.web.views import uicfg

class PrimaryView(EntityView):

    """

    The basic layout of a primary view is as in the :ref:`primary_view_layout`

    section. This layout is actually drawn by the `render_entity` method.

    The methods you may want to modify while customizing a ``PrimaryView``

    are:

    .. automethod:: cubicweb.web.views.primary.PrimaryView.render_entity_title

    .. automethod:: cubicweb.web.views.primary.PrimaryView.render_entity_attributes

    .. automethod:: cubicweb.web.views.primary.PrimaryView.render_entity_relations

    .. automethod:: cubicweb.web.views.primary.PrimaryView.render_side_boxes

    The placement of relations in the relations section or in side boxes

    can be controlled through the :ref:`primary_view_configuration` mechanism.

    .. automethod:: cubicweb.web.views.primary.PrimaryView.content_navigation_components

    Also, please note that by setting the following attributes in your

    subclass, you can already customize some of the rendering:

    :attr:`show_attr_label`

        Renders the attribute label next to the attribute value if set to `True`.

        Otherwise, does only display the attribute value.

    :attr:`show_rel_label`

        Renders the relation label next to the relation value if set to `True`.

        Otherwise, does only display the relation value.

    :attr:`main_related_section`

        Renders the relations of the entity if set to `True`.

    A good practice is for you to identify the content of your entity type for

    which the default rendering does not answer your need so that you can focus

    on the specific method (from the list above) that needs to be modified. We

    do not advise you to overwrite ``render_entity`` unless you want a

    completely different layout.

    """

    __regid__ = 'primary'

    title = _('primary')

    show_attr_label = True

    show_rel_label = True

    rsection = None

    display_ctrl = None

    main_related_section = True

    def html_headers(self):

        """return a list of html headers (eg something to be inserted between

        <head> and </head> of the returned page

        by default primary views are indexed

        """

        return []

    def entity_call(self, entity):

        entity.complete()

        uicfg_reg = self._cw.vreg['uicfg']

        if self.rsection is None:

            self.rsection = uicfg_reg.select('primaryview_section',

                                             self._cw, entity=entity)

        if self.display_ctrl is None:

            self.display_ctrl = uicfg_reg.select('primaryview_display_ctrl',

                                                 self._cw, entity=entity)

        self.render_entity(entity)

    def render_entity(self, entity):

        self.render_entity_toolbox(entity)

        self.render_entity_title(entity)

        # entity's attributes and relations, excluding meta data

        # if the entity isn't meta itself

        if self.is_primary():

            boxes = self._prepare_side_boxes(entity)

        else:

            boxes = None

        if boxes or hasattr(self, 'render_side_related'):

            self.w(u'<table width="100%"><tr><td style="width: 75%">')

        if hasattr(self, 'render_entity_summary'):

            warn('[3.10] render_entity_summary method is deprecated (%s)' % self,

                 DeprecationWarning)

            self.render_entity_summary(entity) # pylint: disable=E1101

        summary = self.summary(entity)

        if summary:

            warn('[3.10] summary method is deprecated (%s)' % self,

                 DeprecationWarning)

            self.w(u'<div class="summary">%s</div>' % summary)

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

        self.content_navigation_components('navcontenttop')

        self.render_entity_attributes(entity)

        if self.main_related_section:

            self.render_entity_relations(entity)

        self.content_navigation_components('navcontentbottom')

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

        # side boxes

        if boxes or hasattr(self, 'render_side_related'):

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

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

            self.render_side_boxes(boxes)

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

            self.w(u'</td></tr></table>')

    def content_navigation_components(self, context):

        """This method is applicable only for entity type implementing the

        interface `IPrevNext`. This interface is for entities which can be

        linked to a previous and/or next entity. This method will render the

        navigation links between entities of this type, either at the top or at

        the bottom of the page given the context (navcontent{top|bottom}).

        """

        self.w(u'<div class="%s">' % context)

        for comp in self._cw.vreg['ctxcomponents'].poss_visible_objects(

            self._cw, rset=self.cw_rset, view=self, context=context):

            # XXX bw compat code

            try:

                comp.render(w=self.w, row=self.cw_row, view=self)

            except TypeError:

                comp.render(w=self.w)

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

    def render_entity_title(self, entity):

        """Renders the entity title, by default using entity's

        :meth:`dc_title()` method.

        """

        title = xml_escape(entity.dc_title())

        if title:

            if self.is_primary():

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

            else:

                atitle = self._cw._('follow this link for more information on this %s') % entity.dc_type()

                self.w(u'<h4><a href="%s" title="%s">%s</a></h4>'

                       % (entity.absolute_url(), atitle, title))

    def render_entity_toolbox(self, entity):

        self.content_navigation_components('ctxtoolbar')

    @deprecated('[3.8] render_entity_metadata method is deprecated')

    def render_entity_metadata(self, entity):

        entity.view('metadata', w=self.w)

    def summary(self, entity):

        """default implementation return an empty string"""

        return u''

    def render_entity_attributes(self, entity):

        """Renders all attributes and relations in the 'attributes' section. 

        """

        display_attributes = []

        for rschema, _, role, dispctrl in self._section_def(entity, 'attributes'):

            vid = dispctrl.get('vid', 'reledit')

            if rschema.final or vid == 'reledit' or dispctrl.get('rtypevid'):

                value = entity.view(vid, rtype=rschema.type, role=role,

                                    initargs={'dispctrl': dispctrl})

            else:

                rset = self._relation_rset(entity, rschema, role, dispctrl)

                if rset:

                    value = self._cw.view(vid, rset)

                else:

                    value = None

            if value is not None and value != '':

                display_attributes.append( (rschema, role, dispctrl, value) )

        if display_attributes:

            self.w(u'<table>')

            for rschema, role, dispctrl, value in display_attributes:

                # pylint: disable=E1101

                if not hasattr(self, '_render_attribute'):

                    label = self._rel_label(entity, rschema, role, dispctrl)

                    self.render_attribute(label, value, table=True)

                else:

                    warn('[3.9] _render_attribute prototype has changed and '

                         'renamed to render_attribute, please update %s'

                         % self.__class__, DeprecationWarning)

                    self._render_attribute(dispctrl, rschema, value, role=role,

                                           table=True)

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

    def render_attribute(self, label, value, table=False):

        self.field(label, value, tr=False, table=table)

    def render_entity_relations(self, entity):

        """Renders all relations in the 'relations' section."""

        defaultlimit = self._cw.property_value('navigation.related-limit')

        for rschema, tschemas, role, dispctrl in self._section_def(entity, 'relations'):

            if rschema.final or dispctrl.get('rtypevid'):

                vid = dispctrl.get('vid', 'reledit')

                try:

                    rview = self._cw.vreg['views'].select(

                        vid, self._cw, rset=entity.cw_rset, row=entity.cw_row,

                        col=entity.cw_col, dispctrl=dispctrl,

                        rtype=rschema, role=role)

                except NoSelectableObject:

                    continue

                value = rview.render(row=entity.cw_row, col=entity.cw_col,

                                     rtype=rschema.type, role=role)

            else:

                vid = dispctrl.get('vid', 'autolimited')

                limit = defaultlimit if vid == 'autolimited' else None

                rset = self._relation_rset(entity, rschema, role, dispctrl, limit=limit)

                if not rset:

                    continue

                if hasattr(self, '_render_relation'):

                    # pylint: disable=E1101

                    self._render_relation(dispctrl, rset, 'autolimited')

                    warn('[3.9] _render_relation prototype has changed and has '

                         'been renamed to render_relation, please update %s'

                         % self.__class__, DeprecationWarning)

                    continue

                try:

                    rview = self._cw.vreg['views'].select(

                        vid, self._cw, rset=rset, dispctrl=dispctrl)

                except NoSelectableObject:

                    continue

                value = rview.render()

            label = self._rel_label(entity, rschema, role, dispctrl)

            self.render_relation(label, value)

    def render_relation(self, label, value):

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

        if label:

            self.w(u'<h4>%s</h4>' % label)

        self.w(value)

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

    def render_side_boxes(self, boxes):

        """Renders side boxes on the right side of the content. This will

        generate a box for each relation in the 'sidebox' section, as well as

        explicit box appobjects selectable in this context.

        """

        for box in boxes:

            if isinstance(box, tuple):

                try:

                    label, rset, vid, dispctrl  = box

                except ValueError:

                    label, rset, vid = box

                    dispctrl = {}

                warn('[3.10] box views should now be a RsetBox instance, '

                     'please update %s' % self.__class__.__name__,

                     DeprecationWarning)

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

                self.wview(vid, rset, title=label, initargs={'dispctrl': dispctrl})

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

            else:

                 try:

                     box.render(w=self.w, row=self.cw_row)

                 except TypeError:

                     box.render(w=self.w)

    def _prepare_side_boxes(self, entity):

        sideboxes = []

        boxesreg = self._cw.vreg['ctxcomponents']

        defaultlimit = self._cw.property_value('navigation.related-limit')

        for rschema, tschemas, role, dispctrl in self._section_def(entity, 'sideboxes'):

            vid = dispctrl.get('vid', 'autolimited')

            limit = defaultlimit if vid == 'autolimited' else None

            rset = self._relation_rset(entity, rschema, role, dispctrl, limit=limit)

            if not rset:

                continue

            label = self._rel_label(entity, rschema, role, dispctrl)

            box = boxesreg.select('rsetbox', self._cw, rset=rset,

                                  vid=vid, title=label, dispctrl=dispctrl,

                                  context='incontext')

            sideboxes.append(box)

        sideboxes += boxesreg.poss_visible_objects(

             self._cw, rset=self.cw_rset, view=self,

             context='incontext')

        # XXX since we've two sorted list, it may be worth using bisect

        def get_order(x):

            if 'order' in x.cw_property_defs:

                return x.cw_propval('order')

            # default to 9999 so view boxes occurs after component boxes

            return x.cw_extra_kwargs.get('dispctrl', {}).get('order', 9999)

        return sorted(sideboxes, key=get_order)

    def _section_def(self, entity, where):

        rdefs = []

        eschema = entity.e_schema

        for rschema, tschemas, role in eschema.relation_definitions(True):

            if rschema in VIRTUAL_RTYPES:

                continue

            matchtschemas = []

            for tschema in tschemas:

                section = self.rsection.etype_get(eschema, rschema, role,

                                                  tschema)

                if section == where:

                    matchtschemas.append(tschema)

            if matchtschemas:

                dispctrl = self.display_ctrl.etype_get(eschema, rschema, role, '*')

                rdefs.append( (rschema, matchtschemas, role, dispctrl) )

        return sorted(rdefs, key=lambda x: x[-1]['order'])

    def _relation_rset(self, entity, rschema, role, dispctrl, limit=None):

        try:

            rset = entity.related(rschema.type, role, limit=limit)

        except Unauthorized:

            return

        if 'filter' in dispctrl:

            rset = dispctrl['filter'](rset)

        return rset

    def _rel_label(self, entity, rschema, role, dispctrl):

        if rschema.final:

            showlabel = dispctrl.get('showlabel', self.show_attr_label)

        else:

            showlabel = dispctrl.get('showlabel', self.show_rel_label)

        if showlabel:

            if dispctrl.get('label'):

                label = self._cw._(dispctrl['label'])

            else:

                label = display_name(self._cw, rschema.type, role,

                                     context=entity.__regid__)

            return label

        return u''

class RelatedView(EntityView):

    """Display a rset, usually containing entities linked to another entity

    being displayed.