#
#  Copyright (c) 2009 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Schema factory stuff.

$Id$
"""

from zope.component import adapts
from zope.interface import implements
from zope.interface import Interface
from zope import schema

from cybertools.composer.schema.field import Field
from cybertools.composer.schema.interfaces import ISchemaFactory
from cybertools.composer.schema.schema import Schema


class Email(schema.TextLine):

    __typeInfo__ = ('email',)


# put field type name and other info in standard field classes.
schema.Field.__typeInfo__ = ('textline',)
schema.Password.__typeInfo__ = ('password',)
schema.Int.__typeInfo__ = ('number',)
schema.Float.__typeInfo__ = ('number',)
schema.Choice.__typeInfo__ = ('dropdown',)


class SchemaFactory(object):
    """ Creates a cybertools.composer schema from an
        interface (a zope.schema schema).
    """

    implements(ISchemaFactory)
    adapts(Interface)

    fieldMapping = {
            #schema.TextLine: ('textline',),
            #schema.ASCIILine: ('textline',),
            schema.Password: ('password',),
            schema.Text: ('textarea',),
            schema.ASCII: ('textarea',),
            schema.Date: ('date',),
            schema.Datetime: ('date',),
            schema.Int: ('number',),
            schema.Float: ('number',),
            schema.Bool: ('checkbox',),
            schema.List: ('list',),
            #schema.Choice: ('dropdown',),
            schema.Bytes: ('fileupload',),
            #Email: ('email',),
    }

    def __init__(self, context):
        self.context = context

    def __call__(self, interface, **kw):
        fieldMapping = self.fieldMapping
        fields = []
        omit = kw.pop('omit', [])
        include = kw.pop('include', [])
        for fname in schema.getFieldNamesInOrder(interface):
            if fname in omit:
                continue
            if include and fname not in include:
                continue
            field = interface[fname]
            info = fieldMapping.get(field.__class__)
            f = createField(field, info)
            fields.append(f)
        return Schema(name=interface.__name__, *fields, **kw)


def createField(field, info=None):
    if info is None:
        info = getattr(field, '__typeInfo__', ('textline',))
    voc = (getattr(field, 'vocabulary', ()) or
           getattr(field, 'vocabularyName', None))
    f = Field(field.getName(),
              fieldType=info[0],
              fieldTypeInfo=len(info) > 1 and info[1] or None,
              required=field.required,
              default=field.default,
              default_method=getattr(field, 'default_method', None),
              vocabulary=voc,
              title=field.title,
              description=field.description,
              readonly=field.readonly,
              #value_type=getattr(field, 'value_type', None),
              nostore=getattr(field, 'nostore', False),
              multiple=getattr(field, 'multiple', False),
              baseField=field,)
    return f