"""abstract box classes for CubicWeb web client

"""

__docformat__ = "restructuredtext en"

_ = unicode

from logilab.mtconverter import xml_escape

from cubicweb import Unauthorized, role as get_role, target as get_target

from cubicweb.schema import display_name

from cubicweb.selectors import (one_line_rset,  primary_view,

                                match_context_prop, partial_has_related_entities)

from cubicweb.view import View, ReloadableMixIn

from cubicweb.web import INTERNAL_FIELD_VALUE

from cubicweb.web.htmlwidgets import (BoxLink, BoxWidget, SideBoxWidget,

                                      RawBoxItem, BoxSeparator)

from cubicweb.web.action import UnregisteredAction

class BoxTemplate(View):

    """base template for boxes, usually a (contextual) list of possible

    actions. Various classes attributes may be used to control the box

    rendering.

    You may override on of the formatting callbacks is this is not necessary

    for your custom box.

    Classes inheriting from this class usually only have to override call

    to fetch desired actions, and then to do something like  ::

        box.render(self.w)

    """

    __registry__ = 'boxes'

    __select__ = match_context_prop()

    categories_in_order = ()

    cw_property_defs = {

        _('visible'): dict(type='Boolean', default=True,

                           help=_('display the box or not')),

        _('order'):   dict(type='Int', default=99,

                           help=_('display order of the box')),

        # XXX 'incontext' boxes are handled by the default primary view

        _('context'): dict(type='String', default='left',

                           vocabulary=(_('left'), _('incontext'), _('right')),

                           help=_('context where this box should be displayed')),

        }

    context = 'left'

    htmlitemclass = 'boxItem'

    def sort_actions(self, actions):

        """return a list of (category, actions_sorted_by_title)"""

        result = []

        actions_by_cat = {}

        for action in actions:

            actions_by_cat.setdefault(action.category, []).append(

                (action.title, action) )

        for key, values in actions_by_cat.items():

            actions_by_cat[key] = [act for title, act in sorted(values)]

        for cat in self.categories_in_order:

            if cat in actions_by_cat:

                result.append( (cat, actions_by_cat[cat]) )

        for item in sorted(actions_by_cat.items()):

            result.append(item)

        return result

    def mk_action(self, title, path, escape=True, **kwargs):

        """factory function to create dummy actions compatible with the

        .format_actions method

        """

        if escape:

            title = xml_escape(title)

        return self.box_action(self._action(title, path, **kwargs))

    def _action(self, title, path, **kwargs):

        return UnregisteredAction(self._cw, self.cw_rset, title, path, **kwargs)

    # formating callbacks

    def boxitem_link_tooltip(self, action):

        if action.__regid__:

            return u'keyword: %s' % action.__regid__

        return u''

    def box_action(self, action):

        cls = getattr(action, 'html_class', lambda: None)() or self.htmlitemclass

        return BoxLink(action.url(), self._cw._(action.title),

                       cls, self.boxitem_link_tooltip(action))

class RQLBoxTemplate(BoxTemplate):

    """abstract box for boxes displaying the content of a rql query not

    related to the current result set.

    It rely on etype, rtype (both optional, usable to control registration

    according to application schema and display according to connected

    user's rights) and rql attributes

    """

    rql  = None

    def to_display_rql(self):

        assert self.rql is not None, self.__regid__

        return (self.rql,)

    def call(self, **kwargs):

        try:

            rset = self._cw.execute(*self.to_display_rql())

        except Unauthorized:

            # can't access to something in the query, forget this box

            return

        if len(rset) == 0:

            return

        box = BoxWidget(self._cw._(self.title), self.__regid__)

        for i, (teid, tname) in enumerate(rset):

            entity = rset.get_entity(i, 0)

            box.append(self.mk_action(tname, entity.absolute_url()))

        box.render(w=self.w)

class UserRQLBoxTemplate(RQLBoxTemplate):

    """same as rql box template but the rql is build using the eid of the

    request's user

    """

    def to_display_rql(self):

        assert self.rql is not None, self.__regid__

        return (self.rql, {'x': self._cw.user.eid}, 'x')

class EntityBoxTemplate(BoxTemplate):

    """base class for boxes related to a single entity"""

    __select__ = BoxTemplate.__select__ & one_line_rset() & primary_view()

    context = 'incontext'

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

        """classes inheriting from EntityBoxTemplate should define cell_call"""

        self.cell_call(row, col, **kwargs)

class RelatedEntityBoxTemplate(EntityBoxTemplate):

    __select__ = EntityBoxTemplate.__select__ & partial_has_related_entities()

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

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

        limit = self._cw.property_value('navigation.related-limit') + 1

        role = get_role(self)

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

        self.wview('sidebox', entity.related(self.rtype, role, limit=limit),

                   title=display_name(self._cw, self.rtype, role))

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

class EditRelationBoxTemplate(ReloadableMixIn, EntityBoxTemplate):

    """base class for boxes which let add or remove entities linked

    by a given relation

    subclasses should define at least id, rtype and target

    class attributes.

    """

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

        self._cw.add_js('cubicweb.ajax.js')

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

        box = SideBoxWidget(display_name(self._cw, self.rtype), self.__regid__)

        related = self.related_boxitems(entity)

        unrelated = self.unrelated_boxitems(entity)

        box.extend(related)

        if related and unrelated:

            box.append(BoxSeparator())

        box.extend(unrelated)

        box.render(self.w)

    def div_id(self):

        return self.__regid__

    def box_item(self, entity, etarget, rql, label):

        """builds HTML link to edit relation between `entity` and `etarget`

        """

        role, target = get_role(self), get_target(self)

        args = {role[0] : entity.eid, target[0] : etarget.eid}

        url = self._cw.user_rql_callback((rql, args))

        # for each target, provide a link to edit the relation

        label = u'[<a href="%s">%s</a>] %s' % (xml_escape(url), label,

                                               etarget.view('incontext'))

        return RawBoxItem(label, liclass=u'invisible')

    def related_boxitems(self, entity):

        rql = 'DELETE S %s O WHERE S eid %%(s)s, O eid %%(o)s' % self.rtype

        related = []

        for etarget in self.related_entities(entity):

            related.append(self.box_item(entity, etarget, rql, u'-'))

        return related

    def unrelated_boxitems(self, entity):

        rql = 'SET S %s O WHERE S eid %%(s)s, O eid %%(o)s' % self.rtype

        unrelated = []

        for etarget in self.unrelated_entities(entity):

            unrelated.append(self.box_item(entity, etarget, rql, u'+'))

        return unrelated

    def related_entities(self, entity):

        return entity.related(self.rtype, get_role(self), entities=True)

    def unrelated_entities(self, entity):

        """returns the list of unrelated entities, using the entity's

        appropriate vocabulary function

        """

        skip = set(e.eid for e in entity.related(self.rtype, get_role(self),

                                                 entities=True))

        skip.add(None)

        skip.add(INTERNAL_FIELD_VALUE)

        filteretype = getattr(self, 'etype', None)

        entities = []

        form = self._cw.vreg['forms'].select('edition', self._cw,

                                             rset=self.cw_rset,

                                             row=self.cw_row or 0)

        field = form.field_by_name(self.rtype, get_role(self), entity.e_schema)

        for _, eid in field.vocabulary(form):

            if eid not in skip:

                entity = self._cw.entity_from_eid(eid)

                if filteretype is None or entity.__regid__ == filteretype:

                    entities.append(entity)

        return entities