"""widget classes for form construction

:organization: Logilab

:copyright: 2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from cubicweb.common import tags

class FieldWidget(object):

    needs_js = ()

    needs_css = ()

    setdomid = True

    settabindex = True

    def __init__(self, attrs=None, setdomid=None, settabindex=None):

        self.attrs = attrs or {}

        if setdomid is not None:

            # override class's default value

            self.setdomid = setdomid

        if settabindex is not None:

            # override class's default value

            self.settabindex = settabindex

    def add_media(self, form):

        """adds media (CSS & JS) required by this widget"""

        req = form.req

        if self.needs_js:

            req.add_js(self.needs_js)

        if self.needs_css:

            req.add_css(self.needs_css)

    def render(self, form, field):

        raise NotImplementedError

    def _render_attrs(self, form, field):

        name = form.context[field]['name']

        values = form.context[field]['value']

        if not isinstance(values, (tuple, list)):

            values = (values,)

        attrs = dict(self.attrs)

        if self.setdomid:

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

        if self.settabindex:

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

        return name, values, attrs

class Input(FieldWidget):

    type = None

    def render(self, form, field):

        self.add_media(form)

        name, values, attrs = self._render_attrs(form, field)

        inputs = [tags.input(name=name, value=value, type=self.type, **attrs)

                  for value in values]

        return u'\n'.join(inputs)

class TextInput(Input):

    type = 'text'

class PasswordInput(Input):

    type = 'password'

    def render(self, form, field):

        self.add_media(form)

        name, values, attrs = self._render_attrs(form, field)

        assert len(values) == 1

        inputs = [tags.input(name=name, value=values[0], type=self.type, **attrs),

                  '<br/>',

                  tags.input(name=name+'-confirm', type=self.type, **attrs),

                  ' ', tags.span(form.req._('confirm password'),

                                      **{'class': 'emphasis'})]

        return u'\n'.join(inputs)

class FileInput(Input):

    type = 'file'

    def _render_attrs(self, form, field):

        # ignore value which makes no sense here (XXX even on form validation error?)

        name, values, attrs = super(FileInput, self)._render_attrs(form, field)

        return name, ('',), attrs

class HiddenInput(Input):

    type = 'hidden'

    setdomid = False # by default, don't set id attribute on hidden input

    settabindex = False

class ButtonInput(Input):

    type = 'button'

class TextArea(FieldWidget):

    def render(self, form, field):

        name, values, attrs = self._render_attrs(form, field)

        attrs.setdefault('onkeypress', 'autogrow(this)')

        if not values:

            value = u''

        elif len(values) == 1:

            value = values[0]

        else:

            raise ValueError('a textarea is not supposed to be multivalued')

        return tags.textarea(value, name=name, **attrs)

class FCKEditor(TextArea):

    def __init__(self, *args, **kwargs):

        super(FCKEditor, self).__init__(*args, **kwargs)

        self.attrs['cubicweb:type'] = 'wysiwyg'

    def render(self, form, field):

        form.req.fckeditor_config()

        return super(FCKEditor, self).render(form, field)

class Select(FieldWidget):

    def __init__(self, attrs=None, multiple=False):

        super(Select, self).__init__(attrs)

        self.multiple = multiple

    def render(self, form, field):

        name, curvalues, attrs = self._render_attrs(form, field)

        options = []

        for label, value in field.vocabulary(form):

            if value in curvalues:

                options.append(tags.option(label, value=value, selected='selected'))

            else:

                options.append(tags.option(label, value=value))

        return tags.select(name=name, multiple=self.multiple,

                           options=options, **attrs)

class CheckBox(Input):

    type = 'checkbox'

    def render(self, form, field):

        name, curvalues, attrs = self._render_attrs(form, field)

        options = []

        for label, value in field.vocabulary(form):

            if value in curvalues:

                tag = tags.input(name=name, value=value, type=self.type,

                                 checked='checked', **attrs)

            else:

                tag = tags.input(name=name, value=value, type=self.type,

                                 **attrs)

            options.append(tag + label)

        return '<br/>\n'.join(options)

class Radio(Input):

    type = 'radio'

    setdomid = False

    def render(self, form, field):

        name, curvalues, attrs = self._render_attrs(form, field)

        options = []

        for label, value in field.vocabulary(form):

            if value in curvalues:

                options.append(tags.input(name=name, type=self.type, value=value, checked='checked', **attrs))

            else:

                options.append(tags.option(name=name, type=self.type, value=value, **attrs))

            options[-1] += label + '<br/>'

        return '\n'.join(options)

class DateTimePicker(TextInput):

    monthnames = ('january', 'february', 'march', 'april',

                  'may', 'june', 'july', 'august',

                  'september', 'october', 'november', 'december')

    daynames = ('monday', 'tuesday', 'wednesday', 'thursday',

                'friday', 'saturday', 'sunday')

    needs_js = ('cubicweb.ajax.js', 'cubicweb.calendar.js')

    needs_css = ('cubicweb.calendar_popup.css',)

    @classmethod

    def add_localized_infos(cls, req):

        """inserts JS variables defining localized months and days"""

        # import here to avoid dependancy from cubicweb-common to simplejson

        _ = req._

        monthnames = [_(mname) for mname in cls.monthnames]

        daynames = [_(dname) for dname in cls.daynames]

        req.html_headers.define_var('MONTHNAMES', monthnames)

        req.html_headers.define_var('DAYNAMES', daynames)

    def render(self, form, field):

        txtwidget = super(DateTimePicker, self).render(form, field)

        self.add_localized_infos(form.req)

        cal_button = self._render_calendar_popup(form, field)

        return txtwidget + cal_button

    def _render_calendar_popup(self, form, field):

        req = form.req

        value = form.context[field]['rawvalue']

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

        helperid = '%shelper' % inputid

        if not value:

            value = date.today()

        year, month = value.year, value.month

        onclick = "toggleCalendar('%s', '%s', %s, %s);" % (

            helperid, inputid, year, month)

        return (u"""<a onclick="toggleCalendar('%s', '%s', %s, %s);" class="calhelper">

<img src="%s" title="%s" alt="" /></a><div class="calpopup hidden" id="%s"></div>"""

                % (helperid, inputid, year, month,

                   req.external_resource('CALENDAR_ICON'),

                   req._('calendar'), helperid) )

class AjaxWidget(FieldWidget):

    def __init__(self, wdgtype, inputid=None, **kwargs):

        super(AjaxWidget, self).__init__(**kwargs)

        self.attrs.setdefault('class', 'widget')

        self.attrs.setdefault('cubicweb:loadtype', 'auto')

        self.attrs['cubicweb:wdgtype'] = wdgtype

        if inputid is not None:

            self.attrs['cubicweb:inputid'] = inputid

    def render(self, form, field):

        self.add_media(form)

        name, values, attrs = self._render_attrs(form, field)

        return tags.div(**attrs)