"""abstract box classes for CubicWeb web client

:organization: Logilab

:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from logilab.common.decorators import cached

from logilab.mtconverter import html_escape

from cubicweb import Unauthorized

from cubicweb.common.registerers import (accepts_registerer,

                                      extresources_registerer,

                                      etype_rtype_priority_registerer)

from cubicweb.common.selectors import (etype_rtype_selector, onelinerset_selector,

from cubicweb.common.view import Template

from cubicweb.common.appobject import ReloadableMixIn

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

                                   RawBoxItem, BoxSeparator)

from cubicweb.web.action import UnregisteredAction

_ = unicode

class BoxTemplate(Template):

    """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'

    __selectors__ = Template.__selectors__ + (contextprop_selector,)

    categories_in_order = ()

    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 = html_escape(title)

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

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

        return UnregisteredAction(self.req, self.rset, title, path, **kwargs)        

    # formating callbacks

    def boxitem_link_tooltip(self, action):

        if action.id:

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

        return u''

    def box_action(self, action):

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

        return BoxLink(action.url(), self.req._(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

    """

    __registerer__ = etype_rtype_priority_registerer

    __selectors__ = BoxTemplate.__selectors__ + (etype_rtype_selector,)

    rql  = None

    def to_display_rql(self):

        assert self.rql is not None, self.id

        return (self.rql,)

    def call(self, **kwargs):

        try:

            rset = self.req.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.req._(self.title), self.id)

        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.id

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

class ExtResourcesBoxTemplate(BoxTemplate):

    """base class for boxes displaying external resources such as the RSS logo.

    It should list necessary resources with the .need_resources attribute.

    """

    __registerer__ = extresources_registerer

    need_resources = ()

class EntityBoxTemplate(BoxTemplate):

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

    __registerer__ = accepts_registerer

    __selectors__ = (onelinerset_selector, primaryview_selector,

                     contextprop_selector, etype_rtype_selector,

    accepts = ('Any',)

    context = 'incontext'

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

        """classes inheriting from EntityBoxTemplate should defined cell_call,

        """

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

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):

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

        entity = self.entity(row, col)

        box = SideBoxWidget(display_name(self.req, self.rtype), self.id)

        count = self.w_related(box, entity)

        if count:

            box.append(BoxSeparator())

        self.w_unrelated(box, entity)

        box.render(self.w)

    def div_id(self):

        return self.id

    @cached

    def xtarget(self):

        if self.target == 'subject':

            return 'object', 'subject'

        return 'subject', 'object'

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

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

        """

        x, target = self.xtarget()

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

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

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

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

                                               etarget.view('incontext'))

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

    def w_related(self, box, entity):

        """appends existing relations to the `box`"""

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

        related = self.related_entities(entity)

        for etarget in related:

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

        return len(related)

    def w_unrelated(self, box, entity):

        """appends unrelated entities to the `box`"""

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

        for etarget in self.unrelated_entities(entity):

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

    def unrelated_entities(self, entity):

        """returns the list of unrelated entities

        if etype is not defined on the Box's class, the default

        behaviour is to use the entity's appropraite vocabulary function

        """

        x, target = self.xtarget()

        # use entity.unrelated if we've been asked for a particular etype

        if hasattr(self, 'etype'):

            return entity.unrelated(self.rtype, self.etype, x).entities()

        # in other cases, use vocabulary functions

        entities = []

        for _, eid in entity.vocabulary(self.rtype, x):

            if eid is not None:

                rset = self.req.eid_rset(eid)

                entities.append(rset.get_entity(0, 0))

        return entities

    def related_entities(self, entity):

        x, target = self.xtarget()

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