# coding=utf-8
"""
"""
from __future__ import absolute_import

from datetime import datetime

from sqlalchemy.schema import Column
from sqlalchemy.types import Integer, DateTime

from whoosh.fields import ID

from ..extensions import db
from ..util import fqcn

#: Base Model class.
Model = db.Model

class Info(dict):

  def __init__(self, **kw):
    for k, v in kw.items():
      self[k] = v

  def copy(self):
    # dict.copy would return an instance of dict
    return self.__class__(**self)

  def __add__(self, other):
    d = self.copy()
    d.update(other)
    return d

  __or__ = __add__

EDITABLE = Info(editable=True)
NOT_EDITABLE = Info(editable=False)
AUDITABLE = Info(auditable=True)
AUDITABLE_HIDDEN = Info(auditable=True, audit_hide_content=True)
NOT_AUDITABLE = Info(auditable=False)
SEARCHABLE = Info(searchable=True)
NOT_SEARCHABLE = Info(searchable=False)
EXPORTABLE = Info(exportable=True)
NOT_EXPORTABLE = Info(exportable=False)

#: SYSTEM properties are properties defined by the system
#: and not supposed to be changed manually.
SYSTEM = Info(editable=False, auditable=False)

class IdMixin(object):
  id = Column(Integer, primary_key=True, info=SYSTEM|SEARCHABLE)


class Indexable(object):
  """
  Mixin with sensible defaults for indexable objects.
  """
  __indexable__ = True
  __indexation_args__ = {
    'index_to': (('object_key', (('object_key',
                                  ID(stored=True, unique=True)),)),
                 ('object_type', (('object_type',
                                   ID(stored=True, unique=False)),)),
                 ),
    }

  @classmethod
  def _object_type(cls):
    return fqcn(cls)

  @property
  def object_type(self):
    return self._object_type()

  @property
  def object_key(self):
    return u'{}:{}'.format(self.object_type, self.id)


class TimestampedMixin(object):
  created_at = Column(DateTime, default=datetime.utcnow, info=SYSTEM|SEARCHABLE)
  updated_at = Column(DateTime, default=datetime.utcnow,
                      onupdate=datetime.utcnow,
                      info=SYSTEM|SEARCHABLE)
  deleted_at = Column(DateTime, default=None, info=SYSTEM)
