"""generic table view, including filtering abilities

:organization: Logilab

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

"""

__docformat__ = "restructuredtext en"

from simplejson import dumps

from logilab.mtconverter import html_escape

from cubicweb.common.utils import make_uid

from cubicweb.common.uilib import toggle_action, limitsize, jsonize, htmlescape

from cubicweb.common.view import EntityView, AnyRsetView

from cubicweb.common.selectors import (nonempty_rset,  match_form_params,

                                    accept_rset)

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

                                   PopupBoxMenu, BoxLink)

from cubicweb.web.facet import prepare_facets_rqlst, filter_hiddens

class TableView(AnyRsetView):

    id = 'table'

    title = _('table')

    finalview = 'final'

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

                    hidden=True):

        rqlst = self.rset.syntax_tree()

        # union not yet supported

        if len(rqlst.children) != 1:

            return ()

        rqlst.save_state()

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

        facets = [facet for facet in self.vreg.possible_vobjects(

            'facets', self.req, self.rset, context='tablefilter',

            filtered_variable=mainvar)

                  if facet.get_widget()]

        rqlst.recover()

        if facets:

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

                               vidargs={'displaycols': displaycols,

                                        'displayactions': displayactions,

                                        'displayfilter': displayfilter})

            return self.show_hide_actions(divid, not hidden)

        return ()

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

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

        occurs when a context eid is given

        """

        wdgs = [facet.get_widget() for facet in facets]

        if not wdgs:

            return

        self.req.add_js( ('cubicweb.ajax.js', 'cubicweb.formfilter.js'))

        # drop False / None values from vidargs

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

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

               html_escape(dumps([divid, 'table', False, vidargs])))

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

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

        filter_hiddens(self.w, facets=','.join(facet.id for facet in facets), baserql=baserql)

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

        self.w(u'<tr>\n')

        for facet in facets:

            self.w(u'<td>')

            facet.get_widget().render(w=self.w)

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

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

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

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

        self.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.vreg.schema.eschema

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

            try:

                if not eschema(etype).is_final():

                    return i

            except KeyError: # XXX possible?

                continue

        return None

    def displaycols(self, displaycols):

        if displaycols is None:

            if 'displaycols' in self.req.form:

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

            else:

                displaycols = range(len(self.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):

        """Dumps 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

        """

        rset = self.rset

        req = self.req

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

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

        rqlst = rset.syntax_tree()

        # get rql description first since the filter form may remove some

        # necessary information

        rqlstdescr = rqlst.get_description()[0] # XXX missing Union support

        mainindex = self.main_var_index()

        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(rset))

        actions = list(actions)

        if mainindex is None:

            displayfilter, displayactions = False, False

        else:

            if displayfilter is None and 'displayfilter' in req.form:

                displayfilter = True

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

                    hidden = False

            if displayactions is None and 'displayactions' in req.form:

                displayactions = True

        displaycols = self.displaycols(displaycols)

        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:

            div_class = 'section'

            self.w(u'<div class="%s">' % div_class)

            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)

        elif displayfilter:

            actions += self.show_hide_actions(divid, True)

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

        if displayactions:

            for action in self.vreg.possible_actions(req, self.rset).get('mainactions', ()):

                actions.append( (action.url(), req._(action.title), action.html_class(), None) )

            self.w(u' cubicweb:displayactions="1">') # close <div tag

        else:

            self.w(u'>') # close <div tag

        # render actions menu

        if actions:

            self.render_actions(divid, actions)

        # render table

        table = TableWidget(self)

        for column in self.get_columns(rqlstdescr, 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 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.req._('show filter form')

        hidelabel = self.req._('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 = '<img src="%s" alt="%s"/>' % (

            self.req.datadir_url + 'liveclipboard-icon.png',

            html_escape(self.req._('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(BoxLink(url, label, klass, ident=ident, escape=True))

        box.render(w=self.w)

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

    def get_columns(self, rqlstdescr, displaycols, headers, subvid, cellvids,

                    cellattrs, mainindex):

        columns = []

        for colindex, attr in enumerate(rqlstdescr):

            if colindex not in displaycols:

                continue

            # compute column header

            if headers is not None:

                label = headers[displaycols.index(colindex)]

            elif colindex == 0 or attr == 'Any': # find a better label

                label = ','.join(display_name(self.req, et)

                                 for et in self.rset.column_types(colindex))

            else:

                label = display_name(self.req, attr)

            if colindex == mainindex:

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

            column = TableColumn(label, colindex)

            coltype = self.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 self.schema.eschema(coltype).is_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(self, cellvid, row, col, w):

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

    def get_rows(self):

        return self.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.rset[row][col]

        if val is None:

            return u''

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

        if self.schema.eschema(etype).is_final():

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

            if entity is None:

                return val # remove_html_tags() ?

            return entity.sortvalue(rtype)

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

        return entity.sortvalue()

class EditableTableView(TableView):

    id = 'editable-table'

    finalview = 'editable-final'

    title = _('editable-table')

class CellView(EntityView):

    __selectors__ = (nonempty_rset, accept_rset)

    id = 'cell'

    accepts = ('Any',)

    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.rset.description[row][col], self.rset[row][col]

        if val is not None and not self.schema.eschema(etype).is_final():

            e = self.rset.get_entity(row, col)

            e.view(cellvid or 'outofcontext', w=self.w)

        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.rset, row=row, col=col)

        else:

            self.wview(cellvid or 'final', self.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

    """

    id = 'initialtable'

    __selectors__ = nonempty_rset, match_form_params

    form_params = ('actualrql',)

    # 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,

             displaycols=None, displayactions=None):

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

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

        self.ensure_ro_rql(actrql)

        displaycols = self.displaycols(displaycols)

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

            displayactions = True

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

            divid = self.req.form['divid']

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

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

            # pop title so it's not displayed by the table view as well

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

        if title:

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

        mainindex = self.main_var_index()

        if mainindex is not None:

            actions = self.form_filter(divid, displaycols, displayactions, True)

        else:

            actions = ()

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

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

        self.view('table', self.req.execute(actrql),

                  'noresult', w=self.w, displayfilter=False, subvid=subvid,

                  displayactions=displayactions, displaycols=displaycols,

                  actions=actions, headers=headers, divid=divid)

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

class EditableInitiableTableView(InitialTableView):

    id = 'editable-initialtable'

    finalview = 'editable-final'