from logilab.mtconverter import html_escape

from cubicweb.interfaces import ITree

from cubicweb.common.selectors import implement_interface, yes

from cubicweb.common.view import EntityView

class TreeView(EntityView):

    id = 'treeview'

    accepts = ('Any',)

    itemvid = 'treeitemview'

    css_classes = 'treeview widget'

    title = _('tree view')

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

        if subvid is None and 'subvid' in self.req.form:

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

        if subvid is None:

            subvid = 'oneline'

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

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

        # XXX find a way, an id is MANDATORY

        treeid = 'TREE' #treeid or self.rset.rows[0][0]

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

             $("#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):

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

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>\n' % entity.view('oneline'))

        else:

            # XXX define specific CSS classes according to mime types

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

class DefaultTreeViewItemView(EntityView):

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

    """

    id = 'treeitemview'

    accepts = ('Any',)

    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)

    """specific treeitem view for entities which implement ITree

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

    """

    id = 'treeitemview'

    # XXX append yes to make sure we get an higher score than

    #     the default treeitem view

    __selectors__ = (implement_interface, yes)

    accepts_interfaces = (ITree,)

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

        w = self.w

        entity = self.entity(row, col)

        liclasses = []

        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 : liclasses.append('last')

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

        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))

            if is_open:

                liclasses.append('collapsable')

            else:

                liclasses.append('expandable')

            divclasses = ['hitarea']

            if is_open:

                divclasses.append('collapsable-hitarea')

            else:

                divclasses.append('expandable-hitarea')

            if is_leaf:

                liclasses.append('lastExpandable')

                if not is_open:

                    divclasses.append('lastExpandable-hitarea')

            if is_open:

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

            else:

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

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

            # sublists presence

            if not is_open:

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

        # the local node info

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

        if is_open: # recurse if needed

            self.wview(parentvid, self.req.execute(rql))

        w(u'</li>')