"""Set of tree-building widgets, based on jQuery treeview plugin

:organization: Logilab

:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from logilab.mtconverter import html_escape

from cubicweb.interfaces import ITree

from cubicweb.selectors import implements

from cubicweb.view import EntityView

from cubicweb.utils import make_uid

def treecookiename(treeid):

    return str('treestate-%s' % treeid)

class TreeView(EntityView):

    id = 'treeview'

    itemvid = 'treeitemview'

    css_classes = 'treeview widget'

    title = _('tree view')

    def call(self, subvid=None, treeid=None, initial_load=True):

        if subvid is None:

            if 'subvid' in self.req.form:

                subvid = self.req.form.pop('subvid') # consume it

            else:

                subvid = 'oneline'

        if treeid is None:

            if 'treeid' in self.req.form:

                treeid = self.req.form.pop('treeid')

            else:

                treeid = make_uid('throw away uid')

                self.warning('Tree state won\'t be properly restored after next reload')

        if initial_load:

            self.req.add_css('jquery.treeview.css')

            self.req.add_js(('cubicweb.ajax.js', 'jquery.treeview.js'))

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

jQuery("#tree-%s").treeview({toggle: toggleTree, prerendered: true});""" % treeid)

        self.w(u'<ul id="tree-%s" class="%s">' % (treeid, self.css_classes))

        for rowidx in xrange(len(self.rset)):

            self.wview(self.itemvid, self.rset, row=rowidx, col=0,

                       vid=subvid, parentvid=self.id)

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

class FileTreeView(TreeView):

    """specific version of the treeview to display file trees

    """

    id = 'filetree'

    css_classes = 'treeview widget filetree'

    title = _('file tree view')

    def call(self, subvid=None, treeid=None, initial_load=True):

        super(FileTreeView, self).call(treeid=treeid, subvid='filetree-oneline', initial_load=initial_load)

class FileItemInnerView(EntityView):

    """inner view used by the TreeItemView instead of oneline view

    This view adds an enclosing <span> with some specific CSS classes

    around the oneline view. This is needed by the jquery treeview plugin.

    """

    id = 'filetree-oneline'

    def cell_call(self, row, col):

        entity = self.entity(row, col)

        if ITree.is_implemented_by(entity.__class__) and not entity.is_leaf():

            self.w(u'<div class="folder">%s</div>' % entity.view('oneline'))

        else:

            # XXX define specific CSS classes according to mime types

            self.w(u'<div class="file">%s</div>' % entity.view('oneline'))

class DefaultTreeViewItemView(EntityView):

    """default treeitem view for entities which don't implement ITree"""

    id = 'treeitemview'

    def cell_call(self, row, col, vid='oneline', parentvid='treeview'):

        entity = self.entity(row, col)

        itemview = self.view(vid, self.rset, row=row, col=col)

        if row == len(self.rset) - 1:

            self.w(u'<li class="last">%s</li>' % itemview)

        else:

            self.w(u'<li>%s</li>' % itemview)

class TreeViewItemView(EntityView):

    """specific treeitem view for entities which implement ITree

    (each item should be expandable if it's not a tree leaf)

    """

    id = 'treeitemview'

    __select__ = implements(ITree)

    def cell_call(self, row, col, vid='oneline', parentvid='treeview'):

        entity = self.entity(row, col)

        cssclasses = []

        is_leaf = False

        if row == len(self.rset) - 1:

            is_leaf = True

        if not hasattr(entity, 'is_leaf') or entity.is_leaf():

            if is_leaf : cssclasses.append('last')

            self.w(u'<li class="%s">' % u' '.join(cssclasses))

        else:

            rql = entity.children_rql() % {'x': entity.eid}

            url = html_escape(self.build_url('json', rql=rql, vid=parentvid,

                                             pageid=self.req.pageid,

                                             subvid=vid,

                                             noautoload=True))

            cssclasses.append('expandable')

            divclasses = ['hitarea expandable-hitarea']

            if is_leaf :

                cssclasses.append('lastExpandable')

                divclasses.append('lastExpandable-hitarea')

            self.w(u'<li cubicweb:loadurl="%s" class="%s">' % (url, u' '.join(cssclasses)))

            self.w(u'<div class="%s"> </div>' % u' '.join(divclasses))

            # add empty <ul> because jquery's treeview plugin checks for

            # sublists presence

            self.w(u'<ul class="placeholder"><li>place holder</li></ul>')

        self.wview(vid, self.rset, row=row, col=col)

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