"""Set of HTML automatic forms to create, delete, copy or edit a single entity
or a list of entities of the same type

:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
"""
__docformat__ = "restructuredtext en"

from copy import copy

from simplejson import dumps

from logilab.mtconverter import html_escape

from cubicweb.selectors import (match_kwargs, one_line_rset, non_final_entity,
                                specified_etype_implements, yes)
from cubicweb.utils import make_uid
from cubicweb.view import EntityView
from cubicweb.common import tags
from cubicweb.web import stdmsgs
from cubicweb.web.form import CompositeForm, EntityFieldsForm, FormViewMixIn
from cubicweb.web.formwidgets import Button, SubmitButton, ResetButton
from cubicweb.web.formrenderers import (FormRenderer, EntityFormRenderer,
                                        EntityCompositeFormRenderer,
                                        EntityInlinedFormRenderer)

_ = unicode

def relation_id(eid, rtype, role, reid):
    """return an identifier for a relation between two entities"""
    if role == 'subject':
        return u'%s:%s:%s' % (eid, rtype, reid)
    return u'%s:%s:%s' % (reid, rtype, eid)

def toggleable_relation_link(eid, nodeid, label='x'):
    """return javascript snippet to delete/undelete a relation between two
    entities
    """
    js = u"javascript: togglePendingDelete('%s', %s);" % (
        nodeid, html_escape(dumps(eid)))
    return u'[<a class="handle" href="%s" id="handle%s">%s</a>]' % (
        js, nodeid, label)


class DeleteConfForm(FormViewMixIn, EntityView):
    """form used to confirm deletion of some entities"""
    id = 'deleteconf'
    title = _('delete')
    # don't use navigation, all entities asked to be deleted should be displayed
    # else we will only delete the displayed page
    need_navigation = False

    def call(self):
        """ask for confirmation before real deletion"""
        req, w = self.req, self.w
        _ = req._
        w(u'<script type="text/javascript">updateMessage(\'%s\');</script>\n'
          % _('this action is not reversible!'))
        # XXX above message should have style of a warning
        w(u'<h4>%s</h4>\n' % _('Do you want to delete the following element(s) ?'))
        form = CompositeForm(req, domid='deleteconf', copy_nav_params=True,
                             action=self.build_url('edit'), onsubmit=None,
                             form_buttons=[Button(stdmsgs.YES, cwaction='delete'),
                                           Button(stdmsgs.NO, cwaction='cancel')])
        done = set()
        w(u'<ul>\n')
        for entity in self.rset.entities():
            if entity.eid in done:
                continue
            done.add(entity.eid)
            subform = EntityFieldsForm(req, entity=entity, set_error_url=False)
            form.form_add_subform(subform)
            # don't use outofcontext view or any other that may contain inline edition form
            w(u'<li>%s</li>' % tags.a(entity.view('textoutofcontext'),
                                      href=entity.absolute_url()))
        w(u'</ul>\n')
        w(form.form_render())


class ClickAndEditFormView(FormViewMixIn, EntityView):
    """form used to permit ajax edition of an attribute of an entity in a view

    (double-click on the field to see an appropriate edition widget)
    """
    id = 'reledit'
    __select__ = non_final_entity() & match_kwargs('rtype')

    # FIXME editableField class could be toggleable from userprefs

    onsubmit = ("return inlineValidateForm('%(divid)s-form', '%(rtype)s', "
                "'%(eid)s', '%(divid)s', %(reload)s);")
    ondblclick = "showInlineEditionForm(%(eid)s, '%(rtype)s', '%(divid)s')"

    def cell_call(self, row, col, rtype=None, role='subject', reload=False):
        """display field to edit entity's `rtype` relation on double-click"""
        entity = self.entity(row, col)
        if getattr(entity, rtype) is None:
            value = self.req._('not specified')
        else:
            value = entity.printable_value(rtype)
        if not entity.has_perm('update'):
            self.w(value)
            return
        eid = entity.eid
        divid = 'd%s' % make_uid('%s-%s' % (rtype, eid))
        event_data = {'divid' : divid, 'eid' : eid, 'rtype' : rtype, 'reload' : dumps(reload)}
        buttons = [SubmitButton(stdmsgs.BUTTON_OK),
                   Button(stdmsgs.BUTTON_CANCEL,
                          onclick="cancelInlineEdit(%s,\'%s\',\'%s\')" % (eid, rtype, divid))]
        form = self.vreg.select_object('forms', 'edition', self.req, self.rset,
                                       row=row, col=col, form_buttons=buttons,
                                       domid='%s-form' % divid, action='#',
                                       cssstyle='display: none',
                                       onsubmit=self.onsubmit % event_data)
        form.form_add_hidden(u'__maineid', entity.eid)
        renderer = FormRenderer(display_label=False, display_help=False,
                                display_fields=(rtype,), button_bar_class='buttonbar',
                                display_progress_div=False)
        self.w(tags.div(value, klass='editableField', id=divid,
                        ondblclick=self.ondblclick % event_data))
        self.w(form.form_render(renderer=renderer))


class EditionFormView(FormViewMixIn, EntityView):
    """display primary entity edition form"""
    id = 'edition'
    # add yes() so it takes precedence over deprecated views in baseforms,
    # though not baseforms based customized view
    __select__ = one_line_rset() & non_final_entity() & yes()

    title = _('edition')
    renderer = EntityFormRenderer()

    def cell_call(self, row, col, **kwargs):
        entity = self.complete_entity(row, col)
        self.render_form(entity)

    def render_form(self, entity):
        """fetch and render the form"""
        self.form_title(entity)
        form = self.vreg.select_object('forms', 'edition', self.req, entity.rset,
                                       row=entity.row, col=entity.col, entity=entity,
                                       submitmsg=self.submited_message())
        self.init_form(form, entity)
        self.w(form.form_render(renderer=self.renderer, formvid=u'edition'))

    def init_form(self, form, entity):
        """customize your form before rendering here"""
        form.form_add_hidden(u'__maineid', entity.eid)

    def form_title(self, entity):
        """the form view title"""
        ptitle = self.req._(self.title)
        self.w(u'<div class="formTitle"><span>%s %s</span></div>' % (
            entity.dc_type(), ptitle and '(%s)' % ptitle))

    def submited_message(self):
        """return the message that will be displayed on successful edition"""
        return self.req._('entity edited')


class CreationFormView(EditionFormView):
    """display primary entity creation form"""
    id = 'creation'
    __select__ = specified_etype_implements('Any') & yes()

    title = _('creation')

    def call(self, **kwargs):
        """creation view for an entity"""
        etype = kwargs.pop('etype', self.req.form.get('etype'))
        try:
            entity = self.vreg.etype_class(etype)(self.req)
        except:
            self.w(self.req._('no such entity type %s') % etype)
        else:
            self.initialize_varmaker()
            entity.eid = self.varmaker.next()
            self.render_form(entity)

    def form_title(self, entity):
        """the form view title"""
        if '__linkto' in self.req.form:
            if isinstance(self.req.form['__linkto'], list):
                # XXX which one should be considered (case: add a ticket to a
                # version in jpl)
                rtype, linkto_eid, role = self.req.form['__linkto'][0].split(':')
            else:
                rtype, linkto_eid, role = self.req.form['__linkto'].split(':')
            linkto_rset = self.req.eid_rset(linkto_eid)
            linkto_type = linkto_rset.description[0][0]
            if role == 'subject':
                title = self.req.__('creating %s (%s %s %s %%(linkto)s)' % (
                    entity.e_schema, entity.e_schema, rtype, linkto_type))
            else:
                title = self.req.__('creating %s (%s %%(linkto)s %s %s)' % (
                    entity.e_schema, linkto_type, rtype, entity.e_schema))
            msg = title % {'linkto' : self.view('incontext', linkto_rset)}
            self.w(u'<div class="formTitle notransform"><span>%s</span></div>' % msg)
        else:
            super(CreationFormView, self).form_title(entity)

    def url(self):
        """return the url associated with this view"""
        return self.create_url(self.req.form.get('etype'))

    def submited_message(self):
        """return the message that will be displayed on successful edition"""
        return self.req._('entity created')


class CopyFormView(EditionFormView):
    """display primary entity creation form initialized with values from another
    entity
    """
    id = 'copy'
    def render_form(self, entity):
        """fetch and render the form"""
        # make a copy of entity to avoid altering the entity in the
        # request's cache.
        self.newentity = copy(entity)
        self.copying = self.newentity.eid
        self.newentity.eid = None
        self.w(u'<script type="text/javascript">updateMessage("%s");</script>\n'
               % self.req._('Please note that this is only a shallow copy'))
        super(CopyFormView, self).render_form(entity)
        del self.newentity

    def init_form(self, form, entity):
        """customize your form before rendering here"""
        super(CopyFormView, self).init_form(form, entity)
        if entity.eid == self.newentity.eid:
            form.form_add_hidden('__cloned_eid', self.copying, eidparam=True)

    def submited_message(self):
        """return the message that will be displayed on successful edition"""
        return self.req._('entity copied')


class TableEditForm(CompositeForm):
    id = 'muledit'
    onsubmit = "return validateForm('entityForm', null);"
    form_buttons = [SubmitButton(_('validate modifications on selected items')),
                    ResetButton(_('revert changes'))]

    def __init__(self, *args, **kwargs):
        super(TableEditForm, self).__init__(*args, **kwargs)
        for row in xrange(len(self.rset)):
            form = self.vreg.select_object('forms', 'edition', self.req, self.rset,
                                           row=row, attrcategories=('primary',),
                                           set_error_url=False)
            # XXX rely on the EntityCompositeFormRenderer to put the eid input
            form.remove_field(form.field_by_name('eid'))
            self.form_add_subform(form)


class TableEditFormView(FormViewMixIn, EntityView):
    id = 'muledit'
    __select__ = EntityView.__select__ & yes()
    title = _('multiple edit')

    def call(self, **kwargs):
        """a view to edit multiple entities of the same type the first column
        should be the eid
        """
        #self.form_title(entity)
        form = self.vreg.select_object('forms', self.id, self.req, self.rset)
        self.w(form.form_render(renderer=EntityCompositeFormRenderer()))


class InlineEntityEditionFormView(FormViewMixIn, EntityView):
    id = 'inline-edition'
    __select__ = non_final_entity() & match_kwargs('peid', 'rtype')
    removejs = "removeInlinedEntity('%s', '%s', '%s')"

    def call(self, **kwargs):
        """redefine default call() method to avoid automatic
        insertions of <div class="section"> between each row of
        the resultset
        """
        rset = self.rset
        for i in xrange(len(rset)):
            self.wview(self.id, rset, row=i, **kwargs)

    def cell_call(self, row, col, peid, rtype, role='subject', **kwargs):
        """
        :param peid: the parent entity's eid hosting the inline form
        :param rtype: the relation bridging `etype` and `peid`
        :param role: the role played by the `peid` in the relation
        """
        entity = self.entity(row, col)
        divonclick = "restoreInlinedEntity('%s', '%s', '%s')" % (peid, rtype,
                                                                 entity.eid)
        self.render_form(entity, peid, rtype, role, divonclick=divonclick)

    def render_form(self, entity, peid, rtype, role, **kwargs):
        """fetch and render the form"""
        form = self.vreg.select_object('forms', 'edition', self.req, None,
                                       entity=entity, set_error_url=False)
        self.add_hiddens(form, entity, peid, rtype, role)
        divid = '%s-%s-%s' % (peid, rtype, entity.eid)
        title = self.schema.rschema(rtype).display_name(self.req, role)
        removejs = self.removejs % (peid, rtype,entity.eid)
        self.w(form.form_render(renderer=EntityInlinedFormRenderer(), divid=divid,
                                title=title, removejs=removejs,**kwargs))

    def add_hiddens(self, form, entity, peid, rtype, role):
        # to ease overriding (see cubes.vcsfile.views.forms for instance)
        if self.keep_entity(entity, peid, rtype):
            if entity.has_eid():
                rval = entity.eid
            else:
                rval = INTERNAL_FIELD_VALUE
            form.form_add_hidden('edit%s-%s:%s' % (role[0], rtype, peid), rval)
        form.form_add_hidden(name='%s:%s' % (rtype, peid), value=entity.eid,
                             id='rel-%s-%s-%s'  % (peid, rtype, entity.eid))

    def keep_entity(self, entity, peid, rtype):
        if not entity.has_eid():
            return True
        # are we regenerating form because of a validation error ?
        erroneous_post = self.req.data.get('formvalues')
        if erroneous_post:
            cdvalues = self.req.list_form_param('%s:%s' % (rtype, peid),
                                                erroneous_post)
            if unicode(entity.eid) not in cdvalues:
                return False
        return True


class InlineEntityCreationFormView(InlineEntityEditionFormView):
    id = 'inline-creation'
    __select__ = (match_kwargs('peid', 'rtype')
                  & specified_etype_implements('Any'))
    removejs = "removeInlineForm('%s', '%s', '%s')"

    def call(self, etype, peid, rtype, role='subject', **kwargs):
        """
        :param etype: the entity type being created in the inline form
        :param peid: the parent entity's eid hosting the inline form
        :param rtype: the relation bridging `etype` and `peid`
        :param role: the role played by the `peid` in the relation
        """
        try:
            entity = self.vreg.etype_class(etype)(self.req, None, None)
        except:
            self.w(self.req._('no such entity type %s') % etype)
            return
        self.initialize_varmaker()
        entity.eid = self.varmaker.next()
        self.render_form(entity, peid, rtype, role)