# copyright 2003-2010 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/>.
"""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 (no_cnx, one_line_rset,  primary_view,
                                match_context_prop, partial_relation_possible,
                                partial_has_related_entities)
from cubicweb.view import View, ReloadableMixIn
from cubicweb.uilib import domid, js
from cubicweb.web import INTERNAL_FIELD_VALUE, stdmsgs
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__ = ~no_cnx() & 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})


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,
                                      context=entity.__regid__))
        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)
        title = display_name(self._cw, self.rtype, get_role(self), context=entity.__regid__)
        box = SideBoxWidget(title, 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(unicode(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


class AjaxEditRelationBoxTemplate(EntityBoxTemplate):
    __select__ = EntityBoxTemplate.__select__ & partial_relation_possible()

    # view used to display related entties
    item_vid = 'incontext'
    # values separator when multiple values are allowed
    separator = ','
    # msgid of the message to display when some new relation has been added/removed
    added_msg = None
    removed_msg = None

    # class attributes below *must* be set in concret classes (additionaly to
    # rtype / role [/ target_etype]. They should correspond to js_* methods on
    # the json controller

    # function(eid)
    # -> expected to return a list of values to display as input selector
    #    vocabulary
    fname_vocabulary = None

    # function(eid, value)
    # -> handle the selector's input (eg create necessary entities and/or
    # relations). If the relation is multiple, you'll get a list of value, else
    # a single string value.
    fname_validate = None

    # function(eid, linked entity eid)
    # -> remove the relation
    fname_remove = None

    def cell_call(self, row, col, **kwargs):
        req = self._cw
        entity = self.cw_rset.get_entity(row, col)
        related = entity.related(self.rtype, self.role)
        rdef = entity.e_schema.rdef(self.rtype, self.role, self.target_etype)
        if self.role == 'subject':
            mayadd = rdef.has_perm(req, 'add', fromeid=entity.eid)
            maydel = rdef.has_perm(req, 'delete', fromeid=entity.eid)
        else:
            mayadd = rdef.has_perm(req, 'add', toeid=entity.eid)
            maydel = rdef.has_perm(req, 'delete', toeid=entity.eid)
        if not (related or mayadd):
            return
        if mayadd or maydel:
            req.add_js(('cubicweb.ajax.js', 'cubicweb.ajax.box.js'))
        _ = req._
        w = self.w
        divid = domid(self.__regid__) + unicode(entity.eid)
        w(u'<div class="sideBox" id="%s%s">' % (domid(self.__regid__), entity.eid))
        w(u'<div class="sideBoxTitle"><span>%s</span></div>' %
               rdef.rtype.display_name(req, self.role, context=entity.__regid__))
        w(u'<div class="sideBox"><div class="sideBoxBody">')
        if related:
            w(u'<table>')
            for rentity in related.entities():
                # for each related entity, provide a link to remove the relation
                subview = rentity.view(self.item_vid)
                if maydel:
                    jscall = unicode(js.ajaxBoxRemoveLinkedEntity(
                        self.__regid__, entity.eid, rentity.eid,
                        self.fname_remove,
                        self.removed_msg and _(self.removed_msg)))
                    w(u'<tr><td>[<a href="javascript: %s">-</a>]</td>'
                      '<td class="tagged">%s</td></tr>' % (xml_escape(jscall),
                                                           subview))
                else:
                    w(u'<tr><td class="tagged">%s</td></tr>' % (subview))
            w(u'</table>')
        else:
            w(_('no related entity'))
        if mayadd:
            req.add_js('jquery.autocomplete.js')
            req.add_css('jquery.autocomplete.css')
            multiple = rdef.role_cardinality(self.role) in '*+'
            w(u'<table><tr><td>')
            jscall = unicode(js.ajaxBoxShowSelector(
                self.__regid__, entity.eid, self.fname_vocabulary,
                self.fname_validate, self.added_msg and _(self.added_msg),
                _(stdmsgs.BUTTON_OK[0]), _(stdmsgs.BUTTON_CANCEL[0]),
                multiple and self.separator))
            w('<a class="button sglink" href="javascript: %s">%s</a>' % (
                xml_escape(jscall),
                multiple and _('add_relation') or _('update_relation')))
            w(u'</td><td>')
            w(u'<div id="%sHolder"></div>' % divid)
            w(u'</td></tr></table>')
        w(u'</div>\n')
        w(u'</div></div>\n')