"""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 logilab.common.decorators import cached

from cubicweb.interfaces import IWorkflowable

from cubicweb.selectors import (specified_etype_implements, implements,

                                match_kwargs, match_form_params, one_line_rset,

                                non_final_entity, accepts_etype_compat)

from cubicweb.utils import make_uid

from cubicweb.view import View, EntityView

from cubicweb.common import tags

from cubicweb.common.uilib import cut

from cubicweb.web import INTERNAL_FIELD_VALUE, stdmsgs, eid_param

from cubicweb.web.controller import NAV_FORM_PARAMETERS

from cubicweb.web.widgets import checkbox, InputWidget, ComboBoxWidget

from cubicweb.web.form import (MultipleFieldsForm, EntityFieldsForm, StringField, 

                               RichTextField, HiddenInput,

                               FormMixIn, relation_id)

_ = unicode

class DeleteConfForm(EntityView):

    id = 'deleteconf'

    title = _('delete')

    domid = 'deleteconf'

    onsubmit = None

    # 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._

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

        req.add_js('cubicweb.edition.js')

        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 = MultipleFieldsForm(req, domid='deleteconf', action=self.build_url('edit'),

                                  onsubmit=self.onsubmit, copy_nav_params=True)

        form.buttons.append(form.button_delete(label=stdmsgs.YES))

        form.buttons.append(form.button_cancel(label=stdmsgs.NO))

        done = set()

        w(u'<ul>\n')

        for i in xrange(self.rset.rowcount):

            if self.rset[i][0] in done:

                continue

            done.add(self.rset[i][0])

            entity = self.rset.get_entity(i, 0)

            subform = EntityFieldsForm(req, set_error_url=False,

                                       entity=entity)

            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 ChangeStateForm(EntityFieldsForm):

    id = 'changestate'

    __method = StringField(name='__method', initial='set_state', widget=HiddenInput)

    state = StringField(widget=HiddenInput, eidparam=True)

    trcomment = RichTextField(eidparam=True)

    def form_buttons(self):

        return [self.button_ok(label=stdmsgs.YES,

                               tabindex=self.req.next_tabindex()),

                self.button_cancel(label=stdmsgs.NO,

                                   tabindex=self.req.next_tabindex())]

class ChangeStateFormView(EntityView):

    id = 'statuschange'

    title = _('status change')

    __select__ = implements(IWorkflowable) & match_form_params('treid')

    def cell_call(self, row, col):

        entity = self.entity(row, col)

        eid = entity.eid

        state = entity.in_state[0]

        transition = self.req.eid_rset(self.req.form['treid']).get_entity(0, 0)

        dest = transition.destination()

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

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

        _ = self.req._

        form = self.vreg.select_object('forms', 'changestate', self.req, self.rset, row, col,

                                  entity=entity, redirect_path=self.redirectpath(entity))

        self.w(form.error_message())

        self.w(u'<h4>%s %s</h4>\n' % (_(transition.name), entity.view('oneline')))

        msg = _('status will change from %(st1)s to %(st2)s') % {

            'st1': _(state.name),

            'st2': _(dest.name)}

        self.w(u'<p>%s</p>\n' % msg)

        self.w(form.form_render(state=dest.eid, trcomment=u''))

    def redirectpath(self, entity):

        return entity.rest_path()

class ClickAndEditForm(FormMixIn, EntityView):

    id = 'reledit'

    __select__ = match_kwargs('rtype')

    def cell_call(self, row, col, rtype=None, role='subject', reload=False):

        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

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

        eid = entity.eid

        edit_key = make_uid('%s-%s' % (rtype, eid))

        divid = 'd%s' % edit_key

class EditionForm(FormMixIn, EntityView):

    """primary entity edition form

    When generating a new attribute_input, the editor will look for a method

    named 'default_ATTRNAME' on the entity instance, where ATTRNAME is the

    name of the attribute being edited. You may use this feature to compute

    dynamic default values such as the 'tomorrow' date or the user's login

    being connected

    """    

    id = 'edition'

    __select__ = one_line_rset() & non_final_entity()

    title = _('edition')

    controller = 'edit'

    skip_relations = FormMixIn.skip_relations.copy()

    EDITION_BODY = u'''\

 %(errormsg)s

<form id="%(formid)s" class="entityForm" cubicweb:target="eformframe"

      method="post" onsubmit="%(onsubmit)s" enctype="%(enctype)s" action="%(action)s">

 %(title)s

 <div id="progress">%(inprogress)s</div>

 <div class="iformTitle"><span>%(mainattrs_label)s</span></div>

 <div class="formBody"><fieldset>

 %(base)s

 %(attrform)s

 %(relattrform)s

</fieldset>

 %(relform)s

 </div>

 <table width="100%%">

  <tbody>

   <tr><td align="center">

     %(validate)s

   </td><td style="align: right; width: 50%%;">

     %(apply)s

     %(cancel)s

   </td></tr>

  </tbody>

 </table>

</form>

'''

    def cell_call(self, row, col, **kwargs):

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

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

        entity = self.complete_entity(row, col)

        self.edit_form(entity, kwargs)

    def edit_form(self, entity, kwargs):

        varmaker = self.req.get_page_data('rql_varmaker')

        if varmaker is None:

            varmaker = self.req.varmaker

            self.req.set_page_data('rql_varmaker', varmaker)

        self.varmaker = varmaker

        self.w(self.EDITION_BODY % self.form_context(entity, kwargs))

    def form_context(self, entity, kwargs):

        """returns the dictionnary used to fill the EDITION_BODY template

        If you create your own edition form, you can probably just override

        `EDITION_BODY` and `form_context`

        """

        if self.need_multipart(entity):

            enctype = 'multipart/form-data'

        else:

            enctype = 'application/x-www-form-urlencoded'

        self._hiddens = []

        if entity.eid is None:

            entity.eid = self.varmaker.next()

        # XXX (hack) action_title might need __linkto req's original value

        #            and widgets such as DynamicComboWidget might change it

        #            so we need to compute title before calling atttributes_form

        formtitle = self.action_title(entity)

        # be sure to call .*_form first so tabindexes are correct and inlined

        # fields errors are consumed

        if not entity.has_eid() or entity.has_perm('update'):

            attrform = self.attributes_form(entity, kwargs)

        else:

            attrform = ''

        inlineform = self.inline_entities_form(entity, kwargs)

        relform = self.relations_form(entity, kwargs)

        vindex = self.req.next_tabindex()

        aindex = self.req.next_tabindex()

        cindex = self.req.next_tabindex()

        self.add_hidden_web_behaviour_params(entity)

        _ = self.req._

        return {

            'formid'   : self.domid,

            'onsubmit' : self.on_submit(entity),

            'enctype'  : enctype,

            'errormsg' : self.error_message(),

            'action'   : self.build_url('validateform'),

            'eids'     : entity.has_eid() and [entity.eid] or [],

            'inprogress': _('validating...'),

            'title'    : formtitle,

            'mainattrs_label' : _('main informations'),

            'reseturl' : self.redirect_url(entity),

            'attrform' : attrform,

            'relform'  : relform,

            'relattrform': inlineform,

            'base'     : self.base_form(entity, kwargs),

            'validate' : self.button_ok(tabindex=vindex),

            'apply'    : self.button_apply(tabindex=aindex),

            'cancel'   : self.button_cancel(tabindex=cindex),

            }

    @property

    def formid(self):

        return self.id

    def action_title(self, entity):

        """form's title"""

        ptitle = self.req._(self.title)

        return u'<div class="formTitle"><span>%s %s</span></div>' % (

            entity.dc_type(), ptitle and '(%s)' % ptitle)

    def base_form(self, entity, kwargs):

        output = []

        for name, value, iid in self._hiddens:

            if isinstance(value, basestring):

                value = html_escape(value)

            if iid:

                output.append(u'<input id="%s" type="hidden" name="%s" value="%s" />'

                              % (iid, name, value))

            else:

                output.append(u'<input type="hidden" name="%s" value="%s" />'

                              % (name, value))

        return u'\n'.join(output)

    def add_hidden_web_behaviour_params(self, entity):

        """inserts hidden params controlling how errors and redirection

        should be handled

        """

        req = self.req

        self._hiddens.append( (u'__maineid', entity.eid, u'') )

        self._hiddens.append( (u'__errorurl', req.url(), u'errorurl') )

        self._hiddens.append( (u'__form_id', self.formid, u'') )

        for param in NAV_FORM_PARAMETERS:

            value = req.form.get(param)

            if value:

                self._hiddens.append( (param, value, u'') )

        msg = self.submited_message()

        # If we need to directly attach the new object to another one

        for linkto in req.list_form_param('__linkto'):

            self._hiddens.append( ('__linkto', linkto, '') )

            msg = '%s %s' % (msg, self.req._('and linked'))

        self._hiddens.append( ('__message', msg, '') )

    def attributes_form(self, entity, kwargs, include_eid=True):

        """create a form to edit entity's attributes"""

        html = []

        w = html.append

        eid = entity.eid

        wdg = entity.get_widget

        lines = (wdg(rschema, x) for rschema, x in self.editable_attributes(entity))

        if include_eid:

            self._hiddens.append( ('eid', entity.eid, '') )

        self._hiddens.append( (eid_param('__type', eid), entity.e_schema, '') )

        w(u'<table id="%s" class="%s" style="width:100%%;">' %

          (kwargs.get('tab_id', 'entityForm%s' % eid),

           kwargs.get('tab_class', 'attributeForm')))

        for widget in lines:

            w(u'<tr>\n<th class="labelCol">%s</th>' % widget.render_label(entity))

            error = widget.render_error(entity)

            if error:

                w(u'<td class="error" style="width:100%;">')

            else:

                w(u'<td style="width:100%;">')

            if error:

                w(error)

            w(widget.edit_render(entity))

            w(widget.render_help(entity))

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

        w(u'</table>')

        return u'\n'.join(html)

    def editable_attributes(self, entity):

        # XXX both (add, delete)

        return [(rschema, x) for rschema, _, x in entity.relations_by_category(('primary', 'secondary'), 'add')

                if rschema != 'eid']

    def relations_form(self, entity, kwargs):

        srels_by_cat = entity.srelations_by_category(('generic', 'metadata'), 'add')

        if not srels_by_cat:

            return u''

        req = self.req

        _ = self.req._

        label = u'%s :' % _('This %s' % entity.e_schema).capitalize()

        eid = entity.eid

        html = []

        w = html.append

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

        w(u'<legend class="iformTitle">%s</legend>' % label)

        w(u'<table id="relatedEntities">')

        for row in self.relations_table(entity):

            # already linked entities

            if row[2]:

                w(u'<tr><th class="labelCol">%s</th>' % row[0].display_name(req, row[1]))

                w(u'<td>')

                w(u'<ul>')

                for viewparams in row[2]:

                    w(u'<li class="invisible">%s<div id="span%s" class="%s">%s</div></li>'

                      % (viewparams[1], viewparams[0], viewparams[2], viewparams[3]))

                if not self.force_display and self.maxrelitems < len(row[2]):

                    w(u'<li class="invisible">%s</li>' % self.force_display_link())

                w(u'</ul>')