# Zope imports
from AccessControl import ClassSecurityInfo
from OFS.Folder import Folder
from Globals import InitializeClass
from Products.PageTemplates.PageTemplateFile import PageTemplateFile
from DateTime import DateTime

# Naaya imports
from Products.NaayaBase.constants import MESSAGE_SAVEDCHANGES, \
                                         PERMISSION_PUBLISH_OBJECTS
from Products.NaayaCore.managers.utils import genObjectId, genRandomId
from naaya.core.custom_types import Interval

from geo import Geo

WIDGET_ID_SUFFIX = '-property'

DATA_TYPES = {
    'int': int,
    'str': unicode,
    'float': float,
    'bool': bool,
    'date': DateTime,
    'geo': Geo,
    'list': list,
    'noop': None,
    'interval': Interval,
}

def propname_from_widgetid(widgetid):
    if not widgetid.endswith(WIDGET_ID_SUFFIX):
        raise ValueError('Widget ID does not end with '
            'WIDGET_ID_SUFFIX ("%s")' % WIDGET_ID_SUFFIX)
    return widgetid[:-len(WIDGET_ID_SUFFIX)]

def widgetid_from_propname(propname):
    """ construct a widget's id based on the property's name """
    # we avoid using "_" as a separator because Localizer will
    # recognise it as a separator and throw manage_addWidget in
    # an endless loop
    return propname + WIDGET_ID_SUFFIX


class WidgetError(Exception):
    """Widget error"""
    pass

def manage_addWidget(klass, container, id="", title=None, REQUEST=None, **kwargs):
    """Add widget"""
    if not title:
        title = str(klass)
    if not id:
        # prevent any name clashes by using the 'w_' prefix
        id = 'w_' + genObjectId(title)

    idSuffix = ''
    while (id+idSuffix in container.objectIds() or
           container._getOb(id+idSuffix, None) is not None):
        idSuffix = genRandomId(p_length=4)
    id = id + idSuffix

    # Get selected language
    lang = None
    if REQUEST is not None:
        lang = REQUEST.form.get('lang', None)
    if not lang:
        lang = kwargs.get('lang', container.gl_get_selected_language())
    widget = klass(id, title=title, lang=lang, **kwargs)

    container._setObject(id, widget)
    widget = container._getOb(id)
    if REQUEST is not None:
        REQUEST.RESPONSE.redirect(REQUEST.HTTP_REFERER)
    return id

class Widget(Folder):
    """ Abstract class for widget """
    meta_type = 'Naaya Schema Widget'
    meta_sortorder = 100 # used to sort the list of available widget types

    security = ClassSecurityInfo()

    # Subobjects
    all_meta_types = ()

    # ZMI Tabs
    manage_options=(
        {'label':'Properties', 'action':'manage_propertiesForm',
         'help':('OFSP','Properties.stx')},
        {'label':'Contents', 'action':'manage_main',
         'help':('OFSP','ObjectManager_Contents.stx')},
        )

    # Properties
    _properties=(
        {
            'id': 'title',
            'label': 'Label',
            'type': 'string',
            'mode': 'w',
        },
        {
            'id': 'sortorder',
            'label': 'Sort order',
            'type': 'int',
            'mode': 'w',
        },
        {
            'id': 'required',
            'label': 'Required',
            'type': 'boolean',
            'mode': 'w',
        },
        {
            'id': 'localized',
            'label': 'Localized',
            'type': 'boolean',
            'mode': 'w',
        },
        {
            'id': 'data_type',
            'label': 'Data type',
            'type': 'string',
            'mode': 'w',
        },
        {
            'id': 'visible',
            'label': 'Visible',
            'type': 'boolean',
            'mode': 'w',
        },
        {
            'id': 'custom_template',
            'label': 'Custom template',
            'type': 'string',
            'mode': 'w',
        },
        {
            'id': 'help_text',
            'label': 'Help text',
            'type': 'string',
            'mode': 'w',
        },

    )

    multiple_form_values = False

    sortorder = 100
    required = False
    default = ''
    localized = False
    data_type = 'str'
    visible = True
    custom_template = ''
    help_text = u''

    def __init__(self, id, title='', lang=None):
        Folder.__init__(self, id=id)
        self.title = title

    def _setProperty(self, id, value, *args, **kwargs):
        if id == 'default':
            self.default = self.convertValue(value)
        else:
            super(Widget, self)._setProperty(id, value, *args, **kwargs)

    def _setPropValue(self, id, value):
        if getattr(self, id) != value:
            super(Widget, self)._setPropValue(id, value)

    security.declareProtected(PERMISSION_PUBLISH_OBJECTS, 'saveProperties')
    def saveProperties(self, REQUEST=None, **kwargs):
        """ Update widget properties"""
        if REQUEST:
            kwargs.update(REQUEST.form)

        _lang = kwargs.get('lang', self.gl_get_selected_language())
        _required = bool(kwargs.get('required'))

        if not _required and self.must_be_mandatory():
            raise ValueError('Can not make property "%s" non-mandatory'
                % self.prop_name())

        self.title = kwargs.get('title')
        self.required = _required
        self.sortorder = int(kwargs.get('sortorder'))
        self.visible = bool(kwargs.get('visible'))

        if REQUEST:
            self.setSessionInfoTrans(MESSAGE_SAVEDCHANGES, date=self.utGetTodayDate())
            return REQUEST.RESPONSE.redirect(REQUEST.HTTP_REFERER)

    def must_be_mandatory(self):
        return (self.get_default_definition() or {}).get('required', False)

    security.declarePrivate('get_default_definition')
    def get_default_definition(self):
        default_definition = self.getParentNode().getDefaultDefinition()
        if default_definition is not None:
            return default_definition.get(self.prop_name(), None)
        return None

    #
    # To be implemented or ovewritten (if needed) by widget concrete classes.
    #
    def isEmptyDatamodel(self, value):
        return not bool(value)

    def parseFormData(self, data):
        return data

    def validateDatamodel(self, value):
        """Validate datamodel"""
        if self.required and self.isEmptyDatamodel(value):
            raise WidgetError('Value required for "%s"' % self.title)

    security.declarePrivate('getPropertyType')
    def getDataType(self):
        return DATA_TYPES[self.data_type]

    security.declarePrivate('convertValue')
    def convertValue(self, value):
        convert = DATA_TYPES[self.data_type]
        if convert is None:
            return value
        try:
            if value in ('', None):
                # special cases for empty values
                if convert in (int, float):
                    return convert(0)
                elif convert is DateTime:
                    return None
            return convert(value)
        except ValueError:
            raise WidgetError('Conversion error: expected %s value '
                'for "%s"' % (self.data_type, self.prop_name()))

    def new_value(self, prev_prop_value, prop_value):
        """
        Given the existing value and the form-submitted value, decide what
        the new value should be. By default, always set the new value.
        """
        return prop_value

    def prop_name(self):
        return propname_from_widgetid(self.getId())

    def index_html(self, REQUEST):
        """ redirect to admin_html """
        return REQUEST.RESPONSE.redirect(self.absolute_url() + '/admin_html')

    def _convert_to_form_string(self, value):
        """ by default this does nothing; subclasses may override. """
        return value

    def _get_custom_template(self):
        if not self.custom_template:
            return None

        tmpl_custom = self.getSite().unrestrictedTraverse(self.custom_template,
                                                          None)
        if tmpl_custom is None:
            return None

        return tmpl_custom.__of__(self)

    def render_html(self, value, context=None, errors=None):
        value = self._convert_to_form_string(value)

        if self.visible:
            tmpl = self._get_custom_template()
            if tmpl is None:
                tmpl = self.template

            return tmpl(value=value, context=context, errors=errors)

        else:
            return self.hidden_template(value=value, context=context)

    def get_widget_type(self):
        classname = self.__class__.__name__
        if classname.endswith('Widget') and len(classname) > len('Widget'):
            return classname[:-len('Widget')]
        else:
            raise ValueError('Bad Widget class name: %s' % classname)

    def convert_from_user_string(self, value):
        """ Convert a user-readable string to a value that can be saved """
        return value

    def convert_to_user_string(self, value):
        """
        Convert a database value to a user-readable string
        this method must return a `unicode` value
        """
        return unicode(value)

    def convert_formvalue_to_pythonvalue(self, value):
        return value

    def convert_to_session(self, value):
        return value

    widget_macro = PageTemplateFile('../zpt/property_widget_macro', globals())
    hidden_template = PageTemplateFile('../zpt/property_widget_hidden',
                                       globals())

    admin_html = PageTemplateFile('../zpt/admin_schema_property', globals())

    _create_template_button = PageTemplateFile(
            '../zpt/manage_create_template_button', globals())

    def manage_propertiesForm(self, *args, **kwargs):
        """ Proxy to PropertyManager's manage_propertiesForm template """
        html = super(Widget, self).manage_propertiesForm(*args, **kwargs)
        if self.custom_template:
            if self._get_custom_template() is None:
                show = 'create_template'
            else:
                show = 'edit_template'
        else:
            show = 'help'
        # hack a create / edit / help button into the property editor form
        button = self._create_template_button(show=show)
        return html.replace('</body>', button + '</body>')

    def manage_create_custom_template(self, REQUEST=None):
        """ """
        from Products.NaayaCore.LayoutTool.Template import manage_addTemplate
        parent_path, name = self.custom_template.rsplit('/', 1)
        parent = self.getSite().unrestrictedTraverse(parent_path)
        manage_addTemplate(parent, name)
        ob = parent[name]
        ob.pt_edit(self.template._text, 'text/html')
        if REQUEST is not None:
            REQUEST.RESPONSE.redirect(ob.absolute_url() + '/manage_workspace')

InitializeClass(Widget)
