# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""generic table view, including filtering abilities"""

__docformat__ = "restructuredtext en"

_ = unicode

from logilab.mtconverter import xml_escape

from cubicweb.selectors import nonempty_rset

from cubicweb.utils import make_uid, json_dumps

from cubicweb.view import EntityView, AnyRsetView

from cubicweb import tags

from cubicweb.uilib import toggle_action, limitsize, htmlescape

from cubicweb.web import jsonize

from cubicweb.web.component import Link

from cubicweb.web.htmlwidgets import (TableWidget, TableColumn, MenuWidget,

                                      PopupBoxMenu)

from cubicweb.web import facet

from cubicweb.web.facet import prepare_facets_rqlst, filter_hiddens

class TableView(AnyRsetView):

    """The table view accepts any non-empty rset. It uses

    introspection on the result set to compute column names and the

    proper way to display the cells.

    It is however highly configurable and accepts a wealth of options.

    """

    __regid__ = 'table'

    title = _('table')

    finalview = 'final'

    wdg_stack_size = 8

    def form_filter(self, divid, displaycols, displayactions, displayfilter,

                    paginate, hidden=True):

        rqlst = self.cw_rset.syntax_tree()

        # union not yet supported

        if len(rqlst.children) != 1:

            return ()

        rqlst = rqlst.copy()

        self._cw.vreg.rqlhelper.annotate(rqlst)

        mainvar, baserql = prepare_facets_rqlst(rqlst, self.cw_rset.args)

        wdgs = [facet.get_widget() for facet in self._cw.vreg['facets'].poss_visible_objects(

            self._cw, rset=self.cw_rset, rqlst=rqlst.children[0], context='tablefilter',

            filtered_variable=mainvar)]

        wdgs = [wdg for wdg in wdgs if wdg is not None]

        if wdgs:

            self._generate_form(divid, baserql, wdgs, hidden,

                               vidargs={'paginate': paginate,

                                        'displaycols': displaycols,

                                        'displayactions': displayactions,

                                        'displayfilter': displayfilter})

            return self.show_hide_actions(divid, not hidden)

        return ()

    def _generate_form(self, divid, baserql, fwidgets, hidden=True, vidargs={}):

        """display a form to filter table's content. This should only

        occur when a context eid is given

        """

        w = self.w

        self._cw.add_css('cubicweb.facets.css')

        self._cw.add_js( ('cubicweb.ajax.js', 'cubicweb.facets.js'))

        # drop False / None values from vidargs

        vidargs = dict((k, v) for k, v in vidargs.iteritems() if v)

        w(u'<form method="post" cubicweb:facetargs="%s" action="">' %

          xml_escape(json_dumps([divid, self.__regid__, False, vidargs])))

        w(u'<fieldset id="%sForm" class="%s">' % (divid, hidden and 'hidden' or ''))

        w(u'<input type="hidden" name="divid" value="%s" />' % divid)

        w(u'<input type="hidden" name="fromformfilter" value="1" />')

        filter_hiddens(w, facets=','.join(wdg.facet.__regid__ for wdg in fwidgets),

                       baserql=baserql)

        self._build_form_table(fwidgets)

    def _facet_widget_sort(self, fwidgets):

        fwidgets.sort(key=lambda x: x.height())

    def _build_form_table(self, fwidgets):

        # sort by widget height

        w = self.w

        self._facet_widget_sort(fwidgets)

        w(u'<table class="filter">\n')

        widget_queue = []

        queue_size = 0

        w(u'<tr>\n')

        for wdg in fwidgets:

            height = wdg.height()

            if queue_size + height <= self.wdg_stack_size:

                widget_queue.append(wdg)

                queue_size += height

                continue

            w(u'<td>')

            for queued in widget_queue:

                queued.render(w=w)

            w(u'</td>')

            widget_queue = [wdg]

            queue_size = height

        if widget_queue:

            w(u'<td>')

            for queued in widget_queue:

                queued.render(w=w)

            w(u'</td>')

        w(u'</tr>\n')

        w(u'</table>\n')

        w(u'</fieldset>\n')

        w(u'</form>\n')

    def main_var_index(self):

        """returns the index of the first non-attribute variable among the RQL

        selected variables

        """

        eschema = self._cw.vreg.schema.eschema

        for i, etype in enumerate(self.cw_rset.description[0]):

            try:

                if not eschema(etype).final:

                    return i

            except KeyError: # XXX possible?

                continue

        return None

    def displaycols(self, displaycols, headers):

        if displaycols is None:

            if 'displaycols' in self._cw.form:

                displaycols = [int(idx) for idx in self._cw.form['displaycols']]

            elif headers is not None:

                displaycols = range(len(headers))

            else:

                displaycols = range(len(self.cw_rset.syntax_tree().children[0].selection))

        return displaycols

    def call(self, title=None, subvid=None, displayfilter=None, headers=None,

             displaycols=None, displayactions=None, actions=(), divid=None,

             cellvids=None, cellattrs=None, mainindex=None,

             paginate=False, page_size=None):

        """Produces a table displaying a composite query

        :param title: title added before table

        :param subvid: cell view

        :param displayfilter: filter that selects rows to display

        :param headers: columns' titles

        """

        req = self._cw

        req.add_js('jquery.tablesorter.js')

        req.add_css(('cubicweb.tablesorter.css', 'cubicweb.tableview.css'))

        # compute label first  since the filter form may remove some necessary

        # information from the rql syntax tree

        if mainindex is None:

            mainindex = self.main_var_index()

        computed_labels = self.columns_labels(mainindex)

        hidden = True

        if not subvid and 'subvid' in req.form:

            subvid = req.form.pop('subvid')

        divid = divid or req.form.get('divid') or 'rs%s' % make_uid(id(self.cw_rset))

        actions = list(actions)

        if mainindex is None:

            displayfilter, displayactions = False, False

        else:

            if displayfilter is None and req.form.get('displayfilter'):

                displayfilter = True

                if req.form['displayfilter'] == 'shown':

                    hidden = False

            if displayactions is None and req.form.get('displayactions'):

                displayactions = True

        displaycols = self.displaycols(displaycols, headers)

        fromformfilter = 'fromformfilter' in req.form

        # if fromformfilter is true, this is an ajax call and we only want to

        # replace the inner div, so don't regenerate everything under the if

        # below

        if not fromformfilter:

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

            if not title and 'title' in req.form:

                title = req.form['title']

            if title:

                self.w(u'<h2 class="tableTitle">%s</h2>\n' % title)

            if displayfilter:

                actions += self.form_filter(divid, displaycols, displayfilter,

                                            displayactions, paginate)

        elif displayfilter:

            actions += self.show_hide_actions(divid, True)

        self.w(u'<div id="%s">' % divid)

        if displayactions:

            actionsbycat = self._cw.vreg['actions'].possible_actions(req, self.cw_rset)

            for action in actionsbycat.get('mainactions', ()):

                for action in action.actual_actions():

                    actions.append( (action.url(), req._(action.title),

                                     action.html_class(), None) )

        # render actions menu

        if actions:

            self.render_actions(divid, actions)

        # render table

        if paginate:

            self.divid = divid # XXX iirk (see usage in page_navigation_url)

            self.paginate(page_size=page_size, show_all_option=False)

        table = TableWidget(self)

        for column in self.get_columns(computed_labels, displaycols, headers,

                                       subvid, cellvids, cellattrs, mainindex):

            table.append_column(column)

        table.render(self.w)

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

        if not fromformfilter:

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

    def page_navigation_url(self, navcomp, path, params):

        if hasattr(self, 'divid'):

            params['divid'] = self.divid

        params['vid'] = self.__regid__

        return navcomp.ajax_page_url(**params)

    def show_hide_actions(self, divid, currentlydisplayed=False):

        showhide = u';'.join(toggle_action('%s%s' % (divid, what))[11:]

                             for what in ('Form', 'Show', 'Hide', 'Actions'))

        showhide = 'javascript:' + showhide

        showlabel = self._cw._('show filter form')

        hidelabel = self._cw._('hide filter form')

        if currentlydisplayed:

            return [(showhide, showlabel, 'hidden', '%sShow' % divid),

                    (showhide, hidelabel, None, '%sHide' % divid)]

        return [(showhide, showlabel, None, '%sShow' % divid),

                (showhide, hidelabel, 'hidden', '%sHide' % divid)]

    def render_actions(self, divid, actions):

        box = MenuWidget('', 'tableActionsBox', _class='', islist=False)

        label = tags.img(src=self._cw.uiprops['PUCE_DOWN'],

                         alt=xml_escape(self._cw._('action(s) on this selection')))

        menu = PopupBoxMenu(label, isitem=False, link_class='actionsBox',

                            ident='%sActions' % divid)

        box.append(menu)

        for url, label, klass, ident in actions:

            menu.append(Link(url, label, klass=klass, id=ident))

        box.render(w=self.w)

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

    def get_columns(self, computed_labels, displaycols, headers, subvid,

                    cellvids, cellattrs, mainindex):

        columns = []

        eschema = self._cw.vreg.schema.eschema

        for colindex, label in enumerate(computed_labels):

            if colindex not in displaycols:

                continue

            # compute column header

            if headers is not None:

                label = headers[displaycols.index(colindex)]

            if colindex == mainindex and label is not None:

                label += ' (%s)' % self.cw_rset.rowcount

            column = TableColumn(label, colindex)

            coltype = self.cw_rset.description[0][colindex]

            # compute column cell view (if coltype is None, it's a left outer

            # join, use the default non final subvid)

            if cellvids and colindex in cellvids:

                column.append_renderer(cellvids[colindex], colindex)

            elif coltype is not None and eschema(coltype).final:

                column.append_renderer(self.finalview, colindex)

            else:

                column.append_renderer(subvid or 'incontext', colindex)

            if cellattrs and colindex in cellattrs:

                for name, value in cellattrs[colindex].iteritems():

                    column.add_attr(name, value)

            # add column

            columns.append(column)

        return columns

    def render_cell(self, cellvid, row, col, w):

        self._cw.view('cell', self.cw_rset, row=row, col=col, cellvid=cellvid, w=w)

    def get_rows(self):

        return self.cw_rset

    @htmlescape

    @jsonize

    @limitsize(10)

    def sortvalue(self, row, col):

        # XXX it might be interesting to try to limit value's

        #     length as much as possible (e.g. by returning the 10

        #     first characters of a string)

        val = self.cw_rset[row][col]

        if val is None:

            return u''

        etype = self.cw_rset.description[row][col]

        if etype is None:

            return u''

        if self._cw.vreg.schema.eschema(etype).final:

            entity, rtype = self.cw_rset.related_entity(row, col)

            if entity is None:

                return val # remove_html_tags() ?

            return entity.sortvalue(rtype)

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

        return entity.sortvalue()

class EditableTableView(TableView):

    __regid__ = 'editable-table'

    finalview = 'editable-final'

    title = _('editable-table')

class CellView(EntityView):

    __regid__ = 'cell'

    __select__ = nonempty_rset()

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

        """

        :param row, col: indexes locating the cell value in view's result set

        :param cellvid: cell view (defaults to 'outofcontext')

        """

        etype, val = self.cw_rset.description[row][col], self.cw_rset[row][col]

        if val is not None and etype is not None and not self._cw.vreg.schema.eschema(etype).final:

            self.wview(cellvid or 'outofcontext', self.cw_rset, row=row, col=col)

        elif val is None:

            # This is usually caused by a left outer join and in that case,

            # regular views will most certainly fail if they don't have

            # a real eid

            self.wview('final', self.cw_rset, row=row, col=col)

        else:

            self.wview(cellvid or 'final', self.cw_rset, 'null', row=row, col=col)

class InitialTableView(TableView):

    """same display as  table view but consider two rql queries :

    * the default query (ie `rql` form parameter), which is only used to select

      this view and to build the filter form. This query should have the same

      structure as the actual without actual restriction (but link to

      restriction variables) and usually with a limit for efficiency (limit set

      to 2 is advised)

    * the actual query (`actualrql` form parameter) whose results will be

      displayed with default restrictions set

    """

    __regid__ = 'initialtable'

    __select__ = nonempty_rset()

    # should not be displayed in possible view since it expects some specific

    # parameters

    title = None

    def call(self, title=None, subvid=None, headers=None, divid=None,

             paginate=False, displaycols=None, displayactions=None,

             mainindex=None):

        """Dumps a table displaying a composite query"""

        try:

            actrql = self._cw.form['actualrql']

        except KeyError:

            actrql = self.cw_rset.printable_rql()