"""Specific views for EProperty

:organization: Logilab

:copyright: 2007-2009 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 logilab.common.decorators import cached

from cubicweb import UnknownProperty

from cubicweb.selectors import (one_line_rset, none_rset, implements,

                                match_user_groups, entity_implements)

from cubicweb.utils import UStringIO

from cubicweb.view import StartupView

from cubicweb.web import INTERNAL_FIELD_VALUE, eid_param, uicfg

from cubicweb.web.views import baseviews

from cubicweb.web import stdmsgs

from cubicweb.web.form import CompositeForm, EntityFieldsForm, FormViewMixIn

from cubicweb.web.formfields import FIELDS, StringField

from cubicweb.web.formwidgets import Select, Button, SubmitButton

from cubicweb.web.views.editforms import AutomaticEntityForm

_ = unicode

# some string we want to be internationalizable for nicer display of eproperty

# groups

_('navigation')

_('ui')

_('actions')

_('boxes')

_('components')

_('contentnavigation')

def make_togglable_link(nodeid, label, cookiename):

    """builds a HTML link that switches the visibility & remembers it"""

    action = u"javascript: toggle_and_remember_visibility('%s', '%s')" % \

        (nodeid, cookiename)

    return u'<a href="%s">%s</a>' % (action, label)

def css_class(someclass):

    return someclass and 'class="%s"' % someclass or ''

class EPropertyPrimaryView(baseviews.PrimaryView):

    __select__ = implements('EProperty')

    skip_none = False

class SystemEPropertiesForm(FormViewMixIn, StartupView):

    id = 'systemepropertiesform'

    __select__ = none_rset() & match_user_groups('managers')

    title = _('site configuration')

    category = 'startupview'

    def linkable(self):

        return True

    def url(self):

        """return the url associated with this view. We can omit rql here"""

        return self.build_url('view', vid=self.id)

    def _cookie_name(self, somestr):

        return str('%s_property_%s' % (self.config.appid, somestr))

    def _group_status(self, group, default=u'hidden'):

        """return css class name 'hidden' (collapsed), or '' (open)"""

        cookies = self.req.get_cookie()

        cookiename = self._cookie_name(group)

        cookie = cookies.get(cookiename)

        if cookie is None:

            cookies[cookiename] = default

            self.req.set_cookie(cookies, cookiename, maxage=None)

            status = default

        else:

            status = cookie.value

        return status

    def call(self, **kwargs):

        """The default view representing the application's index"""

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

        self.req.add_css('cubicweb.preferences.css')

        vreg = self.vreg

        values = self.defined_keys

        groupedopts = {}

        mainopts = {}

        # "self.id=='systemepropertiesform'" to skip site wide properties on

        # user's preference but not site's configuration

        for key in vreg.user_property_keys(self.id=='systemepropertiesform'):

            parts = key.split('.')

            if parts[0] in vreg:

                # appobject configuration

                reg, oid, propid = parts

                groupedopts.setdefault(reg, {}).setdefault(oid, []).append(key)

            else:

                mainopts.setdefault(parts[0], []).append(key)

        # precompute form to consume error message

        for group, keys in mainopts.items():

            mainopts[group] = self.form(keys, True)

        for group, objects in groupedopts.items():

            for oid, keys in objects.items():

                groupedopts[group][oid] = self.form(keys, True)

        w = self.w

        req = self.req

        _ = req._

        w(u'<h1>%s</h1>\n' % _(self.title))

        for label, group, form in sorted((_(g), g, f)

                                         for g, f in mainopts.iteritems()):

            status = css_class(self._group_status(group)) 

            w(u'<h2 class="propertiesform">%s</h2>\n' %

              (make_togglable_link('fieldset_' + group, label,

                                   self._cookie_name(group))))

            w(u'<div id="fieldset_%s" %s>' % (group, status))

            w(form)

        for label, group, objects in sorted((_(g), g, o)

                                            for g, o in groupedopts.iteritems()):

            status = css_class(self._group_status(group))

            w(u'<h2 class="propertiesform">%s</h2>\n' %

              (make_togglable_link('fieldset_' + group, label,

                                   self._cookie_name(group))))

            w(u'<div id="fieldset_%s" %s>' % (group, status))

            for label, oid, form in sorted((self.req.__('%s_%s' % (group, o)), o, f)

                                           for o, f in objects.iteritems()):

                w(u'<fieldset class="subentity">')

                w(u'<legend class="componentTitle">%s</legend>\n' % label)

                docmsgid = '%s_%s_description' % (group, oid)

                doc = _(docmsgid)

                if doc != docmsgid:

                    w(u'<p class="description">%s</p>' % html_escape(doc))

                w(form)

                w(u'</fieldset>')

            w(u'</div>')

    @property

    @cached

    def eprops_rset(self):

        return self.req.execute('Any P,K,V WHERE P is EProperty, P pkey K, '

                                'P value V, NOT P for_user U')

    @property

    def defined_keys(self):

        values = {}

        for i, entity in enumerate(self.eprops_rset.entities()):

            values[entity.pkey] = i

        return values

    def entity_for_key(self, key):

        values = self.defined_keys

        if key in values:

            entity = self.eprops_rset.get_entity(values[key], 0)

        else:

            entity = self.vreg.etype_class('EProperty')(self.req, None, None)

            entity.eid = self.req.varmaker.next()

            entity['pkey'] = key

            entity['value'] = self.vreg.property_value(key)

        return entity

    def form(self, keys, splitlabel=False):

        buttons = [SubmitButton(),

                   Button(stdmsgs.BUTTON_CANCEL, cwaction='cancel')]

        form = CompositeForm(self.req, domid=None, action=self.build_url(),

                             form_buttons=buttons, 

                             submitmsg=self.req._('changes applied'))

        path = self.req.relative_path()

        if '?' in path:

            path, params = path.split('?', 1)

            form.form_add_hidden('__redirectparams', params)

        form.form_add_hidden('__redirectpath', path)

        for key in keys:            

            self.form_row(form, key, splitlabel)

        return form.form_render()

    def form_row(self, form, key, splitlabel):

        entity = self.entity_for_key(key)

        if splitlabel:

            label = key.split('.')[-1]

        else:

            label = key

        subform = EntityFieldsForm(self.req, entity=entity, set_error_url=False)

        subform.append_field(PropertyValueField(name='value', label=label,

                                                eidparam=True))

        subform.vreg = self.vreg

        subform.form_add_hidden('pkey', key, eidparam=True)

        form.form_add_subform(subform)

        return subform

def is_user_prefs(cls, req, rset, row=None, col=0, **kwargs):

    return req.user.eid == rset[row or 0][col]

class EPropertiesForm(SystemEPropertiesForm):

    id = 'epropertiesform'

    __select__ = (

        # we don't want guests to be able to come here

        match_user_groups('users', 'managers') &

        (none_rset() | ((one_line_rset() & is_user_prefs) &

                        (one_line_rset() & match_user_groups('managers'))))

        )

    title = _('preferences')

    @property

    def user(self):

        if self.rset is None:

            return self.req.user

        return self.rset.get_entity(self.row or 0, self.col or 0)

    @property

    @cached

    def eprops_rset(self):

        return self.req.execute('Any P,K,V WHERE P is EProperty, P pkey K, P value V,'

                                'P for_user U, U eid %(x)s', {'x': self.user.eid})

    def form_row(self, form, key, splitlabel):

        subform = super(EPropertiesForm, self).form_row(form, key, splitlabel)

        # if user is in the managers group and the property is being created,

        # we have to set for_user explicitly

        if not subform.edited_entity.has_eid() and self.user.matching_groups('managers'):

            subform.form_add_hidden('for_user', self.user.eid, eidparam=True)

# eproperty form objects ######################################################

class PlaceHolderWidget(object):

    def render(self, form, field):

        domid = form.context[field]['id']

        # empty span as well else html validation fail (label is refering to

        # this id)

        return '<div id="div:%s"><span id="%s">%s</span></div>' % (

            domid, domid, form.req._('select a key first'))

class NotEditableWidget(object):

    def __init__(self, value, msg=None):

        self.value = value

        self.msg = msg

    def render(self, form, field):

        domid = form.context[field]['id']

        value = '<span class="value" id="%s">%s</span>' % (domid, self.value)

        if self.msg:

            value + '<div class="helper">%s</div>' % self.msg

        return value

class PropertyKeyField(StringField):

    """specific field for EProperty.pkey to set the value widget according to

    the selected key

    """

    widget = Select

    def render(self, form, renderer):

        wdg = self.get_widget(form)

        wdg.attrs['tabindex'] = form.req.next_tabindex()

        wdg.attrs['onchange'] = "javascript:setPropValueWidget('%s', %s)" % (

            form.edited_entity.eid, form.req.next_tabindex())

        return wdg.render(form, self)

    def vocabulary(self, form):

        entity = form.edited_entity

        _ = form.req._

        if entity.has_eid():

            return [(_(entity.pkey), entity.pkey)]

        # key beginning with 'system.' should usually not be edited by hand

        choices = entity.vreg.user_property_keys()

        return [(u'', u'')] + sorted(zip((_(v) for v in choices), choices))

class PropertyValueField(StringField):

    """specific field for EProperty.value  which will be different according to

    the selected key type and vocabulary information

    """

    widget = PlaceHolderWidget

    def render(self, form, renderer=None, tabindex=None):

        wdg = self.get_widget(form)

        if tabindex is not None:

            wdg.attrs['tabindex'] = tabindex

        return wdg.render(form, self)

    def form_init(self, form):

        entity = form.edited_entity

        if not (entity.has_eid() or 'pkey' in entity):

            # no key set yet, just include an empty div which will be filled

            # on key selection

            return

        try:

            pdef = form.vreg.property_info(entity.pkey)

        except UnknownProperty, ex:

            self.warning('%s (you should probably delete that property '

                         'from the database)', ex)

            msg = form.req._('you should probably delete that property')

            self.widget = NotEditableWidget(entity.printable_value('value'),

                                            '%s (%s)' % (msg, ex))

        if entity.pkey.startswith('system.'):

            msg = form.req._('value associated to this key is not editable '

                             'manually')

            self.widget = NotEditableWidget(entity.printable_value('value'), msg)

        # XXX race condition when used from EPropertyForm, should not rely on

        # instance attributes

        self.initial = pdef['default']

        self.help = pdef['help']

        vocab = pdef['vocabulary']

        if vocab is not None:

            if callable(vocab):

                # list() just in case its a generator function

                self.choices = list(vocab(form.req))

            else:

                self.choices = vocab

            wdg = Select()

        else:

            wdg = FIELDS[pdef['type']].widget()

            if pdef['type'] == 'Boolean':

                self.choices = [(form.req._('yes'), '1'), (form.req._('no'), '')]

            elif pdef['type'] in ('Float', 'Int'):

                wdg.attrs.setdefault('size', 3)

        self.widget = wdg

uicfg.rfields.set_rtag(PropertyKeyField, 'pkey', 'subject', 'EProperty')

uicfg.rfields.set_rtag(PropertyValueField, 'value', 'subject', 'EProperty')