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

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from cubicweb.selectors import (

    paginated_rset, one_line_rset, primary_view, match_context_prop,

    condition_compat, accepts_compat, has_relation_compat)

from cubicweb.common.appobject import Component, SingletonComponent, ComponentMixIn

from cubicweb.common.utils import merge_dicts

from cubicweb.common.view import View

from cubicweb.common.registerers import action_registerer

from cubicweb.common.uilib import html_escape

_ = unicode

class EntityVComponent(VComponent):

    """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'

    __registerer__ = action_registerer    

    __selectors__ = (one_line_rset, primary_view, match_context_prop,)

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

    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 component')),

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

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

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

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

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

        _('htmlclass'):dict(type='String', default='mainRelated',

                            help=_('html class of the component')),

    }

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

    def call(self, view):

        return self.cell_call(0, 0, view)

    def cell_call(self, row, col, view):

        raise NotImplementedError()

class NavigationComponent(ComponentMixIn, View):

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

    id = 'navigation'

    __selectors__ = (paginated_rset,)

    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 = no_next_page_link = u''

    @classmethod

    def selected(cls, req, rset, row=None, col=None, page_size=None, **kwargs):

        """by default web app objects are usually instantiated on

        selection according to a request, a result set, and optional

        row and col

        """

        instance = super(NavigationComponent, cls).selected(req, rset, row, col, **kwargs)

        if page_size is not None:

            instance.page_size = page_size

        elif 'page_size' in req.form:

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

        return instance

    def __init__(self, req, rset):

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

        self.starting_from = 0

        self.total = rset.rowcount

    def get_page_size(self):

        try:

            return self._page_size

        except AttributeError:

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

            return self._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_link(self, path, params, start, stop, content):

        url = self.build_url(path, **merge_dicts(params, {self.start_param : start,

                                                          self.stop_param : stop,}))

        url = html_escape(url)

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

                                                    self.stop_param : stop,}))

        url = html_escape(url)

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

    def next_link(self, 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 = self.build_url(**merge_dicts(params, {self.start_param : start,

                                                    self.stop_param : stop,}))

        url = html_escape(url)

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

class RelatedObjectsVComponent(EntityVComponent):

    """a section to display some 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)

            if self.target == 'object':

                role = 'subject'

            else:

                role = 'object'

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

        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>')