"""base classes to handle tabbed views

: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 logilab.common.decorators import monkeypatch

from logilab.mtconverter import html_escape

from cubicweb import NoSelectableObject, role

from cubicweb.common.view import EntityView 

from cubicweb.common.selectors import has_related_entities

from cubicweb.common.utils import HTMLHead

from cubicweb.common.uilib import rql_for_eid

from cubicweb.web.views.basecontrollers import JSonController

class LazyViewMixin(object):

    """provides two convenience methods for the tab machinery

    can also be used to lazy-load arbitrary views

    caveat : lazyview is not recursive, i.e : you can't (successfully)

    lazyload a view that in turns does the same

    """

    def _prepare_bindings(self, vid, reloadable):

        self.req.html_headers.add_onload(u"""

  jQuery('#lazy-%(vid)s').bind('%(event)s', function(event) {

     load_now('#lazy-%(vid)s', '#%(vid)s-hole', %(reloadable)s);

  });""" % {'event': 'load_%s' % vid, 'vid': vid,

            'reloadable' : str(reloadable).lower()})

    def lazyview(self, vid, rql=None, eid=None, rset=None, static=False,

                 reloadable=False, show_spinbox=True, w=None):

        """a lazy version of wview

        first version only support lazy viewing for an entity at a time

        """

        assert rql or eid or rset or static, \

            'lazyview wants at least : rql, or an eid, or an rset -- or call it with static=True'

        w = w or self.w

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

        urlparams = {'vid' : vid, 'mode' : 'html'}

        if rql:

            urlparams['rql'] = rql

        elif eid:

            urlparams['rql'] = rql_for_eid(eid)

        elif rset:

            urlparams['rql'] = rset.printable_rql()

        w(u'<div id="lazy-%s" cubicweb:loadurl="%s">' % (

            vid, html_escape(self.build_url('json', **urlparams))))

        if show_spinbox:

            w(u'<img src="data/loading.gif" id="%s-hole" alt="%s"/>'

              % (vid, self.req._('loading')))

        w(u'</div>')

        self._prepare_bindings(vid, reloadable)

    def forceview(self, vid):

        """trigger an event that will force immediate loading of the view

        on dom readyness

        """

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

        self.req.html_headers.add_onload("trigger_load('%s');" % vid)

class TabsMixin(LazyViewMixin):

    """a tab mixin

    """

    @property

    def cookie_name(self):

        return str('%s_active_tab' % self.config.appid)

    def active_tab(self, tabs, default):

        cookies = self.req.get_cookie()

        cookiename = self.cookie_name

        activetab = cookies.get(cookiename)

        if activetab is None:

            cookies[cookiename] = default

            self.req.set_cookie(cookies, cookiename)

            tab = default

        else:

            tab = activetab.value

        return tab in tabs and tab or default

    def prune_tabs(self, tabs):

        selected_tabs = []

        for tab in tabs:

            try:

                self.vreg.select_view(tab, self.req, self.rset)

                selected_tabs.append(tab)

            except NoSelectableObject:

                continue

        return selected_tabs

    def render_tabs(self, tabs, default, entity):

        self.req.add_css('ui.tabs.css')

        self.req.add_js(('ui.core.js', 'ui.tabs.js',

                         'cubicweb.ajax.js', 'cubicweb.tabs.js', 'cubicweb.lazy.js'))

        # prune tabs : not all are to be shown

        tabs = self.prune_tabs(tabs)

        # select a tab

        active_tab = self.active_tab(tabs, default)

        # build the html structure

        w = self.w

        w(u'<div id="entity-tabs-%s">' % entity.eid)

        w(u'<ul>')

        for tab in tabs:

            w(u'<li>')

            w(u'<a href="#as-%s">' % tab)

            w(u'<span onclick="set_tab(\'%s\', \'%s\')">' % (tab, self.cookie_name))

            w(self.req._(tab))

            w(u'</span>')

            w(u'</a>')

            w(u'</li>')

        w(u'</ul>')

        w(u'</div>')

        for tab in tabs:

            w(u'<div id="as-%s">' % tab)

            self.lazyview(tab, eid=entity.eid)

            w(u'</div>')

        # call the set_tab() JS function *after* each tab is generated

        # because the callback binding needs to be done before

        self.req.html_headers.add_onload(u"""

   jQuery('#entity-tabs-%(eeid)s > ul').tabs( { selected: %(tabindex)s });

   set_tab('%(vid)s', '%(cookiename)s');

 """ % {'tabindex'   : tabs.index(active_tab),

        'vid'        : active_tab,

        'eeid'       : entity.eid,

        'cookiename' : self.cookie_name})

class EntityRelatedTab(EntityView):

    """A view you should inherit from leftmost,

    to wrap another actual view displaying entity related stuff.

    Such a view _must_ provide the rtype, target and vid attributes :

    Example :

    class ProjectScreenshotsView(EntityRelationView):

        '''display project's screenshots'''

        id = title = _('projectscreenshots')

        accepts = ('Project',)

        rtype = 'screenshot'

        target = 'object'

        vid = 'gallery'

        __selectors__ = EntityRelationView.__selectors__ + (one_line_rset,)

    This is the view we want to have in a tab, only if there is something to show.

    Then, just define as below, and declare this being the tab content :

    class ProjectScreenshotTab(EntityRelatedTab, ProjectScreenshotsView):

        id = 'screenshots_tab'

    """

    __selectors__ = EntityView.__selectors__ + (has_related_entities,)

    vid = 'list'

    def cell_call(self, row, col):

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

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

        self.wview(self.vid, rset, 'noresult')

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