"""abstract component class and base components definition for CubicWeb web client

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

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

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

_ = unicode

from simplejson import dumps

from logilab.common.deprecation import class_renamed

from logilab.mtconverter import xml_escape

from cubicweb import role

from cubicweb.utils import merge_dicts

from cubicweb.view import View, Component

from cubicweb.selectors import (

    paginated_rset, one_line_rset, primary_view, match_context_prop,

    partial_has_related_entities, condition_compat, accepts_compat,

    has_relation_compat)

class EntityVComponent(Component):

    """abstract base class for additinal components displayed in content

    headers and footer according to:

    * the displayed entity's type

    * a context (currently 'header' or 'footer')

    it should be configured using .accepts, .etype, .rtype, .target and

    .context class attributes

    """

    __registry__ = 'contentnavigation'

    __select__ = one_line_rset() & primary_view() & match_context_prop()

    registered = accepts_compat(has_relation_compat(condition_compat(View.registered)))

    property_defs = {

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

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

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

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

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

                            vocabulary=(_('navtop'), _('navbottom'),

                                        _('navcontenttop'), _('navcontentbottom')),

                            #vocabulary=(_('header'), _('incontext'), _('footer')),

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

    }

    context = 'navcontentbottom' # 'footer' | 'header' | 'incontext'

    def call(self, view=None):

        return self.cell_call(0, 0, view=view)

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

        raise NotImplementedError()

class NavigationComponent(Component):

    """abstract base class for navigation components"""

    id = 'navigation'

    __select__ = paginated_rset()

    property_defs = {

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

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

        }

    page_size_property = 'navigation.page-size'

    start_param = '__start'

    stop_param = '__stop'

    page_link_templ = u'<span class="slice"><a href="%s" title="%s">%s</a></span>'

    selected_page_link_templ = u'<span class="selectedSlice"><a href="%s" title="%s">%s</a></span>'

    previous_page_link_templ = next_page_link_templ = page_link_templ

    no_previous_page_link = u'<<'

    no_next_page_link = u'>>'

    def __init__(self, req, rset, **kwargs):

        super(NavigationComponent, self).__init__(req, rset, **kwargs)

        self.starting_from = 0

        self.total = rset.rowcount

    def get_page_size(self):

        try:

            return self._page_size

        except AttributeError:

            page_size = self.extra_kwargs.get('page_size')

            if page_size is None:

                if 'page_size' in self.req.form:

                    page_size = int(self.req.form['page_size'])

                else:

                    page_size = self.req.property_value(self.page_size_property)

            self._page_size = page_size

            return page_size

    def set_page_size(self, page_size):

        self._page_size = page_size

    page_size = property(get_page_size, set_page_size)

    def page_boundaries(self):

        try:

            stop = int(self.req.form[self.stop_param]) + 1

            start = int(self.req.form[self.start_param])

        except KeyError:

            start, stop = 0, self.page_size

        self.starting_from = start

        return start, stop

    def clean_params(self, params):

        if self.start_param in params:

            del params[self.start_param]

        if self.stop_param in params:

            del params[self.stop_param]

    def page_url(self, path, params, start, stop):

        params = merge_dicts(params, {self.start_param : start,

                                      self.stop_param : stop,})

        if path == 'json':

            rql = params.pop('rql', self.rset.printable_rql())

            # latest 'true' used for 'swap' mode

            url = 'javascript: replacePageChunk(%s, %s, %s, %s, true)' % (

                dumps(params.get('divid', 'paginated-content')),

                dumps(rql), dumps(params.pop('vid', None)), dumps(params))

        else:

            url = self.build_url(path, **params)

        return url

    def page_link(self, path, params, start, stop, content):

        url = xml_escape(self.page_url(path, params, start, stop))

        if start == self.starting_from:

            return self.selected_page_link_templ % (url, content, content)

        return self.page_link_templ % (url, content, content)

    def previous_link(self, path, params, content='<<', title=_('previous_results')):

        start = self.starting_from

        if not start :

            return self.no_previous_page_link

        start = max(0, start - self.page_size)

        stop = start + self.page_size - 1

        url = xml_escape(self.page_url(path, params, start, stop))

        return self.previous_page_link_templ % (url, title, content)

    def next_link(self, path, params, content='>>', title=_('next_results')):

        start = self.starting_from + self.page_size

        if start >= self.total:

            return self.no_next_page_link

        stop = start + self.page_size - 1

        url = xml_escape(self.page_url(path, params, start, stop))

        return self.next_page_link_templ % (url, title, content)

class RelatedObjectsVComponent(EntityVComponent):

    """a section to display some related entities"""

    __select__ = EntityVComponent.__select__ & partial_has_related_entities()

    vid = 'list'

    def rql(self):

        """override this method if you want to use a custom rql query"""

        return None

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

        rql = self.rql()

        if rql is None:

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

            rset = entity.related(self.rtype, role(self))

        else:

            eid = self.rset[row][col]

            rset = self.req.execute(self.rql(), {'x': eid}, 'x')

        if not rset.rowcount:

            return

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

        self.wview(self.vid, rset, title=self.req._(self.title).capitalize())

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

VComponent = class_renamed('VComponent', Component,

                           'VComponent is deprecated, use Component')

SingletonVComponent = class_renamed('SingletonVComponent', Component,

                                    'SingletonVComponent is deprecated, use '

                                    'Component and explicit registration control')