#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2011 Étienne Loks  <etienne.loks_AT_peacefrogsDOTnet>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# See the file COPYING for details.

"""
Models description
"""
import datetime

from django.core.exceptions import ObjectDoesNotExist, ValidationError
from django.core.validators import validate_slug
from django.utils.translation import ugettext_lazy as _, ugettext
from django.db.utils import DatabaseError
from django.utils.safestring import SafeUnicode, mark_safe
from django.db.models import Q, Max
from django.db.models.signals import m2m_changed

from django.contrib.auth.models import User
from django.contrib.gis.db import models
from django.contrib import admin

from simple_history.models import HistoricalRecords as BaseHistoricalRecords

from ishtar import settings

JOINT = u" - "

# HistoricalRecords enhancement: don't save identical versions
class HistoricalRecords(BaseHistoricalRecords):
    def create_historical_record(self, instance, type):
        manager = getattr(instance, self.manager_name)
        attrs = {}
        for field in instance._meta.fields:
            attrs[field.attname] = getattr(instance, field.attname)
        history = instance.history.all()
        if not history:
            manager.create(history_type=type, **attrs)
            return
        old_instance = history[0]
        for field in instance._meta.fields:
            if getattr(old_instance, field.attname) != attrs[field.attname]:
                manager.create(history_type=type, **attrs)
                return

# valid ID validator for models
def valid_id(cls):
    def func(value):
        try:
            cls.objects.get(pk=value)
        except ObjectDoesNotExist:
            raise ValidationError(_(u"Not a valid item."))
    return func

# unique validator for models
def is_unique(cls, field):
    def func(value):
        query = {field:value}
        try:
            assert cls.objects.filter(**query).count() == 0
        except AssertionError:
            raise ValidationError(_(u"This item already exist."))
    return func

class OwnPerms:
    """
    Manage special permissions for object's owner
    """
    @classmethod
    def get_query_owns(cls, user):
        """
        Query object to get own items
        """
        return None # implement for each object

    def is_own(self, user):
        """
        Check if the current object is owned by the user
        """
        query = self.get_query_owns(user)
        if not query:
            return False
        query = query & Q(pk=self.pk)
        return cls.objects.filter(query).count()

    @classmethod
    def has_item_of(cls, user):
        """
        Check if the user own some items
        """
        query = cls.get_query_owns(user)
        if not query:
            return False
        return cls.objects.filter(query).count()

    @classmethod
    def get_owns(cls, user):
        """
        Get Own items
        """
        if isinstance(user, User):
            user = IshtarUser.objects.get(user_ptr=user)
        if user.is_anonymous():
            return []
        query = cls.get_query_owns(user)
        if not query:
            return []
        return cls.objects.filter(query).order_by(*cls._meta.ordering).all()

class GeneralType(models.Model):
    """
    Abstract class for "types"
    """
    label = models.CharField(_(u"Label"), max_length=100)
    txt_idx = models.CharField(_(u"Textual ID"),
                         validators=[validate_slug], max_length=30, unique=True)
    comment = models.TextField(_(u"Comment"), blank=True, null=True)
    available = models.BooleanField(_(u"Available"))
    HELP_TEXT = u""

    class Meta:
        abstract = True

    def __unicode__(self):
        return self.label

    @classmethod
    def get_help(cls, dct={}):
        help_text = cls.HELP_TEXT
        c_rank = -1
        help_items = u"\n"
        for item in cls.get_types(dct=dct, instances=True):
            if not item.comment:
                continue
            if c_rank > item.rank:
                help_items += u"</dl>\n"
            elif c_rank < item.rank:
                help_items += u"<dl>\n"
            c_rank = item.rank
            help_items += u"<dt>%s</dt><dd>%s</dd>" % (item.label,
                                u"<br/>".join(item.comment.split('\n')))
        c_rank += 1
        if c_rank:
            help_items += c_rank*u"</dl>"
        return mark_safe(help_text + help_items)

    @classmethod
    def get_types(cls, dct={}, instances=False):
        base_dct = dct.copy()
        if hasattr(cls, 'parent'):
            return cls._get_parent_types(base_dct, instances)
        return cls._get_types(base_dct, instances)

    @classmethod
    def _get_types(cls, dct={}, instances=False):
        dct['available'] = True
        if not instances:
            yield ('', '--')
        for item in cls.objects.filter(**dct).all():
            if instances:
                item.rank = 0
                yield item
            else:
                yield (item.pk, _(unicode(item)))

    PREFIX = "&rsaquo; "

    @classmethod
    def _get_childs(cls, item, dct, prefix=0, instances=False):
        prefix += 1
        dct['parent'] = item
        childs = cls.objects.filter(**dct)
        if hasattr(cls, 'order'):
            childs = childs.order_by('order')
        for child in childs.all():
            if instances:
                child.rank = prefix
                yield child
            else:
                yield (child.pk, SafeUnicode(prefix*cls.PREFIX + \
                                         unicode(_(unicode(child))) ))
            for sub_child in cls._get_childs(child, dct, prefix, instances):
                yield sub_child

    @classmethod
    def _get_parent_types(cls, dct={}, instances=False):
        dct['available'] = True
        if not instances:
            yield ('', '--')
        dct['parent'] = None
        items = cls.objects.filter(**dct)
        if hasattr(cls, 'order'):
            items = items.order_by('order')
        for item in items.all():
            if instances:
                item.rank = 0
                yield item
            else:
                yield (item.pk, unicode(item))
            for child in cls._get_childs(item, dct, instances):
                yield child

class HistoryError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)

class BaseHistorizedItem(models.Model):
    history_modifier = models.ForeignKey(User, related_name='+',
                                      verbose_name=_(u"Last modifier"))
    class Meta:
        abstract = True

    def save(self, *args, **kwargs):
        assert hasattr(self, 'history_modifier') == True
        super(BaseHistorizedItem, self).save(*args, **kwargs)
        return True

    def get_previous(self, step=None, date=None, strict=True):
        """
        Get a "step" previous state of the item
        """
        assert step or date
        historized = self.history.all()
        item = None
        if step:
            assert len(historized) > step
            item = historized[step]
        else:
            for step, item in enumerate(historized):
                if item.history_date == date:
                    break
            # ended with no match
            if item.history_date != date:
                return
        item._step = step
        if len(historized) != (step + 1):
            item._previous = historized[step + 1].history_date
        else:
            item._previous = None
        if step > 0:
            item._next = historized[step - 1].history_date
        else:
            item._next = None
        item.history_date = historized[step].history_date
        model = self.__class__
        for k in model._meta.get_all_field_names():
            field = model._meta.get_field_by_name(k)[0]
            if hasattr(field, 'rel') and field.rel:
                if not hasattr(item, k+'_id'):
                    setattr(item, k, getattr(self, k))
                    continue
                val = getattr(item, k+'_id')
                if not val:
                    setattr(item, k, None)
                    continue
                try:
                    val = field.rel.to.objects.get(pk=val)
                    setattr(item, k, val)
                except ObjectDoesNotExist:
                    if strict:
                        raise HistoryError(u"The class %s has no pk %d" % (
                                           unicode(field.rel.to), val))
                    setattr(item, k, None)
        item.pk = self.pk
        return item

    def rollback(self, date):
        """
        Rollback to a previous state
        """
        to_del, new_item = [], None
        for item in self.history.all():
            to_del.append(item)
            if item.history_date == date:
                new_item = item
                break
        if not new_item:
            raise HistoryError(u"The date to rollback to doesn't exist.")
        try:
            for f in self._meta.fields:
                k = f.name
                if k != 'id' and hasattr(self, k):
                    if not hasattr(new_item, k):
                        k = k + "_id"
                    setattr(self, k, getattr(new_item, k))
            self.save()
        except:
            raise HistoryError(u"The rollback has failed.")
        # clean the obsolete history
        for historized_item in to_del:
            historized_item.delete()

    def values(self):
        values = {}
        for f in self._meta.fields:
            k = f.name
            if k != 'id':
                values[k] = getattr(self, k)
        return values

class LightHistorizedItem(BaseHistorizedItem):
    history_date = models.DateTimeField(default=datetime.datetime.now)
    class Meta:
        abstract = True

class Departement(models.Model):
    label = models.CharField(_(u"Label"), max_length=30)
    number = models.CharField(_(u"Number"), unique=True, max_length=3)

    class Meta:
        verbose_name = _(u"Departement")
        verbose_name_plural = _(u"Departements")
        ordering = ['number']

    def __unicode__(self):
        return unicode(self.number) + JOINT + self.label

class Address(BaseHistorizedItem):
    address = models.TextField(_(u"Address"), null=True, blank=True)
    address_complement = models.TextField(_(u"Address complement"), null=True,
                                          blank=True)
    postal_code = models.CharField(_(u"Postal code"), max_length=10, null=True,
                                   blank=True)
    town = models.CharField(_(u"Town"), max_length=30, null=True, blank=True)
    country = models.CharField(_(u"Country"), max_length=30, null=True,
                               blank=True)
    phone = models.CharField(_(u"Phone"), max_length=18, null=True, blank=True)
    mobile_phone = models.CharField(_(u"Mobile phone"), max_length=18,
                                    null=True, blank=True)
    history = HistoricalRecords()

    class Meta:
        abstract = True

class OrganizationType(GeneralType):
    class Meta:
        verbose_name = _(u"Organization type")
        verbose_name_plural = _(u"Organization types")

class Organization(Address, OwnPerms):
    name = models.CharField(_(u"Name"), max_length=100)
    organization_type = models.ForeignKey(OrganizationType,
                                          verbose_name=_(u"Type"))
    history = HistoricalRecords()
    class Meta:
        verbose_name = _(u"Organization")
        verbose_name_plural = _(u"Organizations")
        permissions = (
          ("view_own_organization", ugettext(u"Can view own Organization")),
          ("add_own_organization", ugettext(u"Can add own Organization")),
          ("change_own_organization", ugettext(u"Can change own Organization")),
          ("delete_own_organization", ugettext(u"Can delete own Organization")),
        )

    def __unicode__(self):
        return self.name

class PersonType(GeneralType):
    class Meta:
        verbose_name = _(u"Person type")
        verbose_name_plural = _(u"Person types")

class Person(Address, OwnPerms) :
    TYPE = (('Mr', _(u'Mr')),
            ('Ms', _(u'Miss')),
            ('Md', _(u'Mrs')),
            ('Dr', _(u'Doctor')),
            )
    title = models.CharField(_(u"Title"), max_length=2, choices=TYPE)
    surname = models.CharField(_(u"Surname"), max_length=20)
    name = models.CharField(_(u"Name"), max_length=30)
    email = models.CharField(_(u"Email"), max_length=40, blank=True, null=True)
    person_type = models.ForeignKey(PersonType, verbose_name=_(u"Type"))
    attached_to = models.ForeignKey('Organization',
                       verbose_name=_(u"Is attached to"), blank=True, null=True)
    is_author = models.NullBooleanField(_(u"Is an author?"), blank=True,
                                        null=True)
    in_charge_storage = models.NullBooleanField(_(u"In charge of a storage?"),
                                            blank=True, null=True)

    class Meta:
        verbose_name = _(u"Person")
        verbose_name_plural = _(u"Persons")
        permissions = (
            ("view_person", ugettext(u"Can view Person")),
            ("view_own_person", ugettext(u"Can view own Person")),
            ("add_own_person", ugettext(u"Can add own Person")),
            ("change_own_person", ugettext(u"Can change own Person")),
            ("delete_own_person", ugettext(u"Can delete own Person")),
        )

    def __unicode__(self):
        lbl = u"%s %s" % (self.name, self.surname)
        lbl += JOINT
        if self.attached_to:
            lbl += unicode(self.attached_to)
        elif self.email:
            lbl += self.email
        return lbl

    def full_label(self):
        return u" ".join([unicode(getattr(self, attr))
                         for attr in ('title', 'surname', 'name', 'attached_to')
                         if getattr(self, attr)])

class IshtarUser(User):
    person = models.ForeignKey(Person, verbose_name=_(u"Person"), unique=True)

    class Meta:
        verbose_name = _(u"Ishtar user")
        verbose_name_plural = _(u"Ishtar users")

class AuthorType(GeneralType):
    class Meta:
        verbose_name = _(u"Author type")
        verbose_name_plural = _(u"Author types")

class Author(models.Model):
    person = models.ForeignKey(Person, verbose_name=_(u"Person"))
    author_type = models.ForeignKey(AuthorType, verbose_name=_(u"Author type"))

    class Meta:
        verbose_name = _(u"Author")
        verbose_name_plural = _(u"Authors")

    def __unicode__(self):
        return unicode(self.person) + JOINT + unicode(self.author_type)

class SourceType(GeneralType):
    class Meta:
        verbose_name = _(u"Source type")
        verbose_name_plural = _(u"Source types")

class Source(models.Model):
    title = models.CharField(_(u"Title"), max_length=200)
    source_type = models.ForeignKey(SourceType, verbose_name=_(u"Type"))
    authors = models.ManyToManyField(Author, verbose_name=_(u"Authors"))
    TABLE_COLS = ['title', 'source_type', 'authors',]

    class Meta:
        abstract = True

    def __unicode__(self):
        return self.title

class FileType(GeneralType):
    class Meta:
        verbose_name = _(u"Archaeological file type")
        verbose_name_plural = _(u"Archaeological file types")

    @classmethod
    def is_preventive(cls, file_type_id, key=''):
        key = key or 'preventive'
        try:
            preventive = FileType.objects.get(txt_idx=key).pk
            return file_type_id == preventive
        except ObjectDoesNotExist:
            return False

class PermitType(GeneralType):
    class Meta:
        verbose_name = _(u"Permit type")
        verbose_name_plural = _(u"Permit types")

if settings.COUNTRY == 'fr':
    class SaisineType(GeneralType):
        delay = models.IntegerField(_(u"Delay (in days)"))
        class Meta:
            verbose_name = u"Type Saisine"
            verbose_name_plural = u"Types Saisine"

class File(BaseHistorizedItem, OwnPerms):
    TABLE_COLS = ['numeric_reference', 'year', 'internal_reference',
                  'file_type', 'saisine_type', 'towns', ]
    year = models.IntegerField(_(u"Year"),
                               default=lambda:datetime.datetime.now().year)
    numeric_reference = models.IntegerField(_(u"Numeric reference"))
    internal_reference = models.CharField(_(u"Internal reference"),
                                          max_length=60, unique=True)
    file_type = models.ForeignKey(FileType, verbose_name=_(u"File type"))
    in_charge = models.ForeignKey(Person, related_name='+',
                                  verbose_name=_(u"Person in charge"))
    general_contractor = models.ForeignKey(Person, related_name='+',
               verbose_name=_(u"General contractor"), blank=True, null=True)
    town_planning_service = models.ForeignKey(Organization, related_name='+',
               verbose_name=_(u"Town planning service"), blank=True, null=True)
    permit_type = models.ForeignKey(PermitType, verbose_name=_(u"Permit type"),
                                                          blank=True, null=True)
    permit_reference = models.CharField(_(u"Permit reference"),
                                          max_length=60, blank=True, null=True)
    is_active = models.BooleanField(_(u"Is active?"), default=True)
    towns = models.ManyToManyField("Town", verbose_name=_(u"Towns"))
    creation_date = models.DateField(_(u"Creation date"),
                                     default=datetime.date.today)
    reception_date = models.DateField(_(u'Reception date'), blank=True,
                                      null=True)
    related_file = models.ForeignKey("File", verbose_name=_(u"Related file"),
                                     blank=True, null=True)
    if settings.COUNTRY == 'fr':
        saisine_type = models.ForeignKey(SaisineType, blank=True, null=True,
                                         verbose_name= u"Type de saisine")
        reference_number = models.IntegerField(_(u"Reference number"),
                                               blank=True, null=True)
    total_surface = models.IntegerField(_(u"Total surface (m²)"),
                                        blank=True, null=True)
    total_developed_surface = models.IntegerField(
            _(u"Total developed surface (m²)"), blank=True, null=True)
    address = models.TextField(_(u"Main address"), null=True, blank=True)
    address_complement = models.TextField(_(u"Main address - complement"),
                                          null=True, blank=True)
    postal_code = models.CharField(_(u"Main address - postal code"),
                                   max_length=10, null=True, blank=True)
    comment = models.TextField(_(u"Comment"))
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Archaeological file")
        verbose_name_plural = _(u"Archaeological files")
        permissions = (
            ("view_own_file", ugettext(u"Can view own Archaelogical file")),
            ("add_own_file", ugettext(u"Can add own Archaelogical file")),
            ("change_own_file", ugettext(u"Can change own Archaelogical file")),
            ("delete_own_file", ugettext(u"Can delete own Archaelogical file")),
        )
        ordering = ['-year', '-numeric_reference']

    def __unicode__(self):
        items = [unicode(_('Intercommunal'))]
        if self.towns.count() == 1:
            items[0] = unicode(self.towns.all()[0])
        items.append("-".join((unicode(self.year),
                               unicode(self.numeric_reference))))
        items += [unicode(getattr(self, k))[:36]
                  for k in ['internal_reference',] if getattr(self, k)]
        return JOINT.join(items)

    @classmethod
    def get_query_owns(cls, user):
        return Q(history_modifier=user) & Q(is_active=True)

    def closing(self):
        if self.is_active:
            return
        for item in self.history.all():
            if item.is_active():
                break
            closing_item = item
        return {'date':item.history_date, 'user':item.history_modifier}

    def total_surface_ha(self):
        if self.total_surface:
            return self.total_surface/10000.0

    def total_developed_surface_ha(self):
        if self.total_developed_surface:
            return self.total_developed_surface/10000.0

    def operation_acts(self):
        acts = []
        for ope in self.operations.all():
            for act in ope.administrative_act.all():
                acts.append(act)
        return acts

    def is_preventive(self):
        return FileType.is_preventive(self.file_type.pk)

class OperationType(GeneralType):
    class Meta:
        verbose_name = _(u"Operation type")
        verbose_name_plural = _(u"Operation types")

    @classmethod
    def is_preventive(cls, ope_type_id, key=''):
        key = key or 'prev_excavation'
        try:
            preventive = OperationType.objects.get(txt_idx=key).pk
            return ope_type_id == preventive
        except ObjectDoesNotExist:
            return False

class RemainType(GeneralType):
    class Meta:
        verbose_name = _(u"Remain type")
        verbose_name_plural = _(u"Remain types")

class Operation(BaseHistorizedItem, OwnPerms):
    TABLE_COLS = ['operation_code', 'year', 'operation_type',
                  'remains', 'towns', 'associated_file', 'start_date']
    start_date = models.DateField(_(u"Start date"), null=True, blank=True)
    end_date = models.DateField(_(u"Closing date"), null=True, blank=True)
    in_charge = models.ForeignKey('Person', related_name='+', null=True,
                                  blank=True, verbose_name=_(u"In charge"))
    year = models.IntegerField(_(u"Year"))
    operation_code = models.IntegerField(_(u"Operation code"))
    associated_file = models.ForeignKey(File, related_name='operations',
                                 verbose_name=_(u"File"), blank=True, null=True)
    operation_type = models.ForeignKey(OperationType, related_name='+',
                                       verbose_name=_(u"Operation type"))
    surface = models.IntegerField(_(u"Surface (m²)"), blank=True, null=True)
    remains = models.ManyToManyField("RemainType", verbose_name=_(u'Remains'))
    towns = models.ManyToManyField("Town", verbose_name=_(u"Towns"))
    cost = models.IntegerField(_(u"Cost (€)"), blank=True, null=True)
    periods = models.ManyToManyField('Period', verbose_name=_(u"Periods"))
    if settings.COUNTRY == 'fr':
        code_patriarche = models.IntegerField(u"Code PATRIARCHE", null=True,
                                              blank=True)
        code_dracar = models.CharField(u"Code DRACAR", max_length=10, null=True,
                                       blank=True)
        fnap_financing = models.FloatField(u"Financement FNAP",
                                             blank=True, null=True)
        TABLE_COLS += ["code_patriarche"]
        zoning_prescription = models.NullBooleanField(
                            _(u"Prescription on zoning"), blank=True, null=True)
        large_area_prescription = models.NullBooleanField(
                        _(u"Prescription on large area"), blank=True, null=True)
        geoarchaeological_context_prescription = models.NullBooleanField(
         _(u"Prescription on geoarchaeological context"), blank=True, null=True)
    comment = models.TextField(_(u"Comment"), null=True, blank=True)
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Operation")
        verbose_name_plural = _(u"Operations")
        permissions = (
            ("view_own_operation", ugettext(u"Can view own Operation")),
            ("add_own_operation", ugettext(u"Can add own Operation")),
            ("change_own_operation", ugettext(u"Can change own Operation")),
            ("delete_own_operation", ugettext(u"Can delete own Operation")),
        )

    def __unicode__(self):
        items = [unicode(_('Intercommunal'))]
        if self.towns.count() == 1:
            items[0] = unicode(self.towns.all()[0])
        items.append("-".join((unicode(self.year),
                               unicode(self.operation_code))))
        return JOINT.join(items)

    def is_own(self, person):
        return False

    @classmethod
    def get_query_owns(cls, user):
        return Q(in_charge=user.person)|Q(history_modifier=user)\
               & Q(end_date__isnull=True)

    def is_active(self):
        return not bool(self.end_date)

    def closing(self):
        if self.is_active():
            return
        for item in self.history.all():
            if not item.end_date:
                break
        return {'date':item.history_date,
                'user':IshtarUser.objects.get(pk=item.history_modifier_id)}

class OperationSource(Source):
    class Meta:
        verbose_name = _(u"Operation documentation")
        verbose_name_plural = _(u"Operation documentations")
    operation = models.ForeignKey(Operation, verbose_name=_(u"Operation"),
                                  related_name="source")
    TABLE_COLS = ['operation.year', 'operation.operation_code'] + \
                 Source.TABLE_COLS

class Parcel(LightHistorizedItem):
    associated_file = models.ForeignKey(File, related_name='parcels',
                                blank=True, null=True, verbose_name=_(u"File"))
    operation = models.ForeignKey(Operation, related_name='parcels', blank=True,
                                  null=True, verbose_name=_(u"Operation"))
    year = models.IntegerField(_(u"Year"),
                               default=lambda:datetime.datetime.now().year)
    town = models.ForeignKey("Town", related_name='parcels',
                             verbose_name=_(u"Town"))
    section = models.CharField(_(u"Section"), max_length=4)
    parcel_number = models.CharField(_(u"Parcel number"), max_length=6)

    class Meta:
        verbose_name = _(u"Parcel")
        verbose_name_plural = _(u"Parcels")

    def short_label(self):
        return JOINT.join([unicode(item) for item in [self.section,
                                                   self.parcel_number] if item])

    def __unicode__(self):
        return self.short_label()

    def long_label(self):
        return JOINT.join([unicode(item) for item in \
       [self.associated_file, self.operation, self.section, self.parcel_number]
                                          if item])

class Period(GeneralType) :
    order = models.IntegerField(_(u"Order"))
    start_date = models.IntegerField(_(u"Start date"))
    end_date = models.IntegerField(_(u"End date"))
    parent = models.ForeignKey("Period", verbose_name=_(u"Parent period"),
                               blank=True, null=True)

    class Meta:
        verbose_name = _(u"Type Period")
        verbose_name_plural = _(u"Types Period")

    def __unicode__(self):
        return self.label

class DatingType(GeneralType):
    class Meta:
        verbose_name = _(u"Dating type")
        verbose_name_plural = _(u"Dating types")

class DatingQuality(GeneralType):
    class Meta:
        verbose_name = _(u"Dating quality")
        verbose_name_plural = _(u"Dating qualities")

class Dating(models.Model):
    period = models.ForeignKey(Period, verbose_name=_(u"Period"))
    start_date = models.IntegerField(_(u"Start date"), blank=True, null=True)
    end_date = models.IntegerField(_(u"End date"), blank=True, null=True)
    dating_type = models.ForeignKey(DatingType, verbose_name=_(u"Dating type"),
                                    blank=True, null=True)
    quality = models.ForeignKey(DatingQuality, verbose_name=_(u"Quality"),
                                blank=True, null=True)

    class Meta:
        verbose_name = _(u"Dating")
        verbose_name_plural = _(u"Datings")

    def __unicode__(self):
        start_date = self.start_date and unicode(self.start_date) or u""
        end_date = self.end_date and unicode(self.end_date) or u""
        if not start_date and not end_date:
            return unicode(self.period)
        return u"%s (%s-%s)" % (self.period, start_date, end_date)

class Unit(GeneralType):
    order = models.IntegerField(_(u"Order"))
    parent = models.ForeignKey("Unit", verbose_name=_(u"Parent unit"),
                               blank=True, null=True)

    class Meta:
        verbose_name = _(u"Type Unit")
        verbose_name_plural = _(u"Types Unit")

    def __unicode__(self):
        return self.label

class ActivityType(GeneralType):
    order = models.IntegerField(_(u"Order"))

    class Meta:
        verbose_name = _(u"Type Activity")
        verbose_name_plural = _(u"Types Activity")

    def __unicode__(self):
        return self.label

class IdentificationType(GeneralType):
    order = models.IntegerField(_(u"Order"))
    class Meta:
        verbose_name = _(u"Type Identification")
        verbose_name_plural = _(u"Types Identification")

    def __unicode__(self):
        return self.label

class ContextRecord(BaseHistorizedItem, OwnPerms):
    TABLE_COLS = ['parcel.town', 'operation.year',
                  'operation.operation_code',
                  'label', 'unit']
    if settings.COUNTRY == 'fr':
        TABLE_COLS.insert(1, 'parcel.operation.code_patriarche')
    parcel = models.ForeignKey(Parcel, verbose_name=_(u"Parcel"),
                               related_name='context_record')
    operation = models.ForeignKey(Operation, verbose_name=_(u"Operation"),
                                  related_name='context_record')
    label = models.CharField(_(u"ID"), max_length=200)
    description = models.TextField(_("Description"), blank=True, null=True)
    length = models.IntegerField(_(u"Length (cm)"), blank=True, null=True)
    width = models.IntegerField(_(u"Width (cm)"), blank=True, null=True)
    thickness = models.IntegerField(_(u"Thickness (cm)"), blank=True, null=True)
    depth = models.IntegerField(_(u"Depth (cm)"), blank=True, null=True)
    location = models.CharField(_(u"Location"), blank=True, null=True,
     max_length=200,
     help_text=_(u"A short description of the location of the context record"))
    datings = models.ManyToManyField(Dating)
    unit = models.ForeignKey(Unit, verbose_name=_(u"Unit"), related_name='+',
                             blank=True, null=True)
    has_furniture = models.NullBooleanField(u"Has furniture?", blank=True,
                                            null=True)
    filling = models.TextField(_(u"Filling"), blank=True, null=True)
    interpretation = models.TextField(_(u"Interpretation"), blank=True,
                                      null=True)
    taq = models.IntegerField(_(u"TAQ"), blank=True, null=True,
     help_text=_("\"Terminus Ante Quem\" the context record can't have been "
                 "created after this date"))
    taq_estimated = models.IntegerField(_(u"Estimated TAQ"), blank=True,
     null=True, help_text=_("Estimation of a \"Terminus Ante Quem\""))
    tpq = models.IntegerField(_(u"TPQ"), blank=True, null=True,
     help_text=_("\"Terminus Post Quem\" the context record can't have been "
                 " created before this date"))
    tpq_estimated = models.IntegerField(_(u"Estimated TPQ"), blank=True,
     null=True, help_text=_("Estimation of a \"Terminus Post Quem\""))
    identification = models.ForeignKey(IdentificationType, blank=True,
                            null=True, verbose_name=_(u"Identification"),)
    activity = models.ForeignKey(ActivityType,blank=True, null=True,
                                 verbose_name=_(u"Activity"),)
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Context Record")
        verbose_name_plural = _(u"Context Record")
        permissions = (
 ("view_own_contextrecord", ugettext(u"Can view own Context Record")),
 ("add_own_contextrecord", ugettext(u"Can add own Context Record")),
 ("change_own_contextrecord", ugettext(u"Can change own Context Record")),
 ("delete_own_contextrecord", ugettext(u"Can delete own Context Record")),
        )

    def __unicode__(self):
        return JOINT.join((unicode(self.parcel), self.label))

    def full_label(self):
        if not self.parcel.operation:
            return unicode(self)
        return self._real_label() or self._temp_label()

    def _real_label(self):
        if not self.parcel.operation.code_patriarche:
            return
        return JOINT.join((self.parcel.operation.code_patriarche,
                           self.label))

    def _temp_label(self):
        if self.parcel.operation.code_patriarche:
            return
        return JOINT.join([unicode(lbl) for lbl in [self.parcel.operation.year,
                                           self.parcel.operation.operation_code,
                                           self.label] if lbl])
class ContextRecordSource(Source):
    class Meta:
        verbose_name = _(u"Context record documentation")
        verbose_name_plural = _(u"Context record documentations")
    context_record = models.ForeignKey(ContextRecord,
                       verbose_name=_(u"Context record"), related_name="source")

class MaterialType(GeneralType):
    recommendation = models.TextField(_(u"Recommendation"))
    parent = models.ForeignKey("MaterialType", blank=True, null=True,
                               verbose_name=_(u"Parent material"))

    class Meta:
        verbose_name = _(u"Material type")
        verbose_name_plural = _(u"Material types")

class BaseItem(BaseHistorizedItem, OwnPerms):
    label = models.CharField(_(u"ID"), max_length=60)
    description = models.TextField(_(u"Description"))
    context_record = models.ForeignKey(ContextRecord,
              related_name='base_items', verbose_name=_(u"Context Record"))
    is_isolated = models.NullBooleanField(_(u"Is isolated?"), blank=True,
                                          null=True)
    index = models.IntegerField(u"Index", default=0)
    material_index = models.IntegerField(u"Material index", default=0)
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Base item")
        verbose_name_plural = _(u"Base items")
        permissions = (
            ("view_own_baseitem", ugettext(u"Can view own Base item")),
            ("add_own_baseitem", ugettext(u"Can add own Base item")),
            ("change_own_baseitem", ugettext(u"Can change own Base item")),
            ("delete_own_baseitem", ugettext(u"Can delete own Base item")),
        )

    def __unicode__(self):
        return self.label

    def get_last_item(self):
        #TODO: manage virtuals - property(last_item) ?
        items = self.item.filter().order_by("-order").all()
        return items and items[0]

    def full_label(self):
        return self._real_label() or self._temp_label()

    def material_type_label(self):
        item = self.get_last_item()
        lbl = item and (unicode(item.material_type) + unicode(_(":"))) or ''
        if self.context_record.parcel.operation.code_patriarche:
            return lbl + JOINT.join([unicode(it) for it in (
                           self.context_record.parcel.operation.code_patriarche,
                           self.context_record.label,
                           self.material_index,
                           self.label)])
        return lbl + JOINT.join([unicode(it) for it in (
                           self.context_record.parcel.year,
                           self.index,
                           self.context_record.label,
                           self.material_index,
                           self.label)])


    def _real_label(self):
        if not self.context_record.parcel.operation.code_patriarche:
            return
        return JOINT.join([unicode(it) for it in (
                           self.context_record.parcel.operation.code_patriarche,
                           self.context_record.label,
                           self.label)])

    def _temp_label(self):
        if self.context_record.parcel.operation.code_patriarche:
            return
        return JOINT.join([unicode(it) for it in (
                           self.context_record.parcel.year,
                           self.index,
                           self.context_record.label,
                           self.label)])
class Item(BaseHistorizedItem, OwnPerms):
    TABLE_COLS = ['base_items.context_record.parcel.town',
                  'base_items.context_record.parcel.operation.year',
                  'base_items.context_record.parcel.operation.operation_code',
                  'label', 'material_type', 'dating.period',
                  'base_items.is_isolated']
    if settings.COUNTRY == 'fr':
        TABLE_COLS.insert(1,
                  'base_items.context_record.parcel.operation.code_patriarche')
    base_items = models.ManyToManyField(BaseItem, verbose_name=_(u"Base item"),
                                        related_name='item')
    order = models.IntegerField(_(u"Order"))
    label = models.CharField(_(u"ID"), max_length=60)
    description = models.TextField(_(u"Description"), blank=True, null=True)
    material_type = models.ForeignKey(MaterialType,
                              verbose_name = _(u"Material type"))
    volume = models.FloatField(_(u"Volume (l)"), blank=True, null=True)
    weight = models.FloatField(_(u"Weight (g)"), blank=True, null=True)
    item_number = models.IntegerField(_("Item number"), blank=True, null=True)
    upstream_treatment = models.ForeignKey("Treatment", blank=True, null=True,
      related_name='downstream_treatment', verbose_name=_("Upstream treatment"))
    downstream_treatment = models.ForeignKey("Treatment", blank=True, null=True,
      related_name='upstream_treatment', verbose_name=_("Downstream treatment"))
    dating = models.ForeignKey(Dating, verbose_name=_(u"Dating"))
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Item")
        verbose_name_plural = _(u"Items")
        permissions = (
            ("view_own_item", ugettext(u"Can view own Item")),
            ("add_own_item", ugettext(u"Can add own Item")),
            ("change_own_item", ugettext(u"Can change own Item")),
            ("delete_own_item", ugettext(u"Can delete own Item")),
        )

    def __unicode__(self):
        return self.label

    def save(self, *args, **kwargs):
        if not self.pk:
            super(Item, self).save(*args, **kwargs)
        for base_item in self.base_items.all():
            if not base_item.index:
                idx = BaseItem.objects.filter(context_record=\
                      base_item.context_record).aggregate(Max('index'))
                base_item.index = idx and idx['index__max'] + 1 or 1
            if not base_item.material_index:
                idx = BaseItem.objects.filter(context_record=\
                        base_item.context_record,
                        item__material_type=self.material_type).aggregate(
                                                      Max('material_index'))
                base_item.material_index = idx and \
                                        idx['material_index__max'] + 1 or 1
            base_item.save()
        super(Item, self).save(*args, **kwargs)

class ItemSource(Source):
    class Meta:
        verbose_name = _(u"Item documentation")
        verbose_name_plural = _(u"Item documentations")
    item = models.ForeignKey(Item, verbose_name=_(u"Item"),
                             related_name="source")

class ParcelOwner(LightHistorizedItem):
    owner = models.ForeignKey(Person, verbose_name=_(u"Owner"))
    parcel = models.ForeignKey(Parcel, verbose_name=_(u"Parcel"))
    start_date = models.DateField(_(u"Start date"))
    end_date = models.DateField(_(u"End date"))

    class Meta:
        verbose_name = _(u"Parcel owner")
        verbose_name_plural = _(u"Parcel owners")

    def __unicode__(self):
        return self.owner + JOINT + self.parcel

class WarehouseType(GeneralType):
    class Meta:
        verbose_name = _(u"Warehouse type")
        verbose_name_plural = _(u"Warehouse types")

class Warehouse(Address, OwnPerms):
    name = models.CharField(_(u"Name"), max_length=40)
    warehouse_type = models.ForeignKey(WarehouseType,
                                       verbose_name=_(u"Warehouse type"))
    person_in_charge = models.ForeignKey(Person,
                     verbose_name=_(u"Person in charge"), null=True, blank=True)
    comment = models.TextField(_(u"Comment"), null=True, blank=True)

    class Meta:
        verbose_name = _(u"Warehouse")
        verbose_name_plural = _(u"Warehouses")
        permissions = (
            ("view_own_warehouse", ugettext(u"Can view own Warehouse")),
            ("add_own_warehouse", ugettext(u"Can add own Warehouse")),
            ("change_own_warehouse", ugettext(u"Can change own Warehouse")),
            ("delete_own_warehouse", ugettext(u"Can delete own Warehouse")),
        )

    def __unicode__(self):
        return u"%s (%s)" % (self.name, unicode(self.warehouse_type))

class ActType(GeneralType):
    TYPE = (('F', _(u'Archaelogical file')),
            ('O', _(u'Operation')),
            )
    intented_to = models.CharField(_(u"Intended to"), max_length=1,
                                   choices=TYPE)
    class Meta:
        verbose_name = _(u"Act type")
        verbose_name_plural = _(u"Act types")

class AdministrativeAct(BaseHistorizedItem, OwnPerms):
    TABLE_COLS = ['act_type', 'associated_file', 'operation',
                  'associated_file.towns', 'operation.towns']
    TABLE_COLS_FILE = ['act_type', 'associated_file', 'associated_file.towns',]
    TABLE_COLS_OPE = ['act_type', 'operation', 'operation.towns']
    act_type = models.ForeignKey(ActType, verbose_name=_(u"Act type"))
    in_charge = models.ForeignKey(Person, blank=True, null=True,
        related_name='+', verbose_name=_(u"Person in charge of the operation"))
    operator = models.ForeignKey(Organization, blank=True, null=True,
                    verbose_name=_(u"Archaeological preventive operator"))
    scientific = models.ForeignKey(Person, blank=True, null=True,
related_name='+', verbose_name=_(u"Person in charge of the scientific part"))
    signatory = models.ForeignKey(Person, blank=True, null=True,
                    related_name='+', verbose_name=_(u"Signatory"))
    operation = models.ForeignKey(Operation, blank=True, null=True,
                related_name='administrative_act', verbose_name=_(u"Operation"))
    associated_file = models.ForeignKey(File, blank=True, null=True,
       related_name='administrative_act', verbose_name=_(u"Archaelogical file"))
    signature_date = models.DateField(_(u"Signature date"))
    act_object = models.CharField(_(u"Object"), max_length=200)
    if settings.COUNTRY == 'fr':
        ref_sra = models.CharField(u"Référence SRA", max_length=15)
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Administrative act")
        verbose_name_plural = _(u"Administrative acts")
        permissions = (
("view_own_administrativeact", ugettext(u"Can view own Administrative act")),
("add_own_administrativeact", ugettext(u"Can add own Administrative act")),
("change_own_administrativeact", ugettext(u"Can change own Administrative act")),
("delete_own_administrativeact", ugettext(u"Can delete own Administrative act")),
        )

    def __unicode__(self):
        return JOINT.join([unicode(item)
          for item in [self.operation, self.associated_file, self.act_object]
          if item])

class ContainerType(GeneralType):
    length = models.IntegerField(_(u"Length (mm)"))
    width = models.IntegerField(_(u"Width (mm)"))
    height = models.IntegerField(_(u"Height (mm)"))
    volume = models.IntegerField(_(u"Volume (l)"))
    reference = models.CharField(_(u"Reference"), max_length=30)

    class Meta:
        verbose_name = _(u"Container type")
        verbose_name_plural = _(u"Container types")

class Container(LightHistorizedItem):
    location = models.ForeignKey(Warehouse, verbose_name=_(u"Location"))
    container_type = models.ForeignKey(ContainerType,
                                       verbose_name=_("Container type"))
    reference = models.CharField(_(u"Reference"), max_length=40)
    comment = models.TextField(_(u"Comment"))

    class Meta:
        verbose_name = _(u"Container")
        verbose_name_plural = _(u"Containers")

if settings.COUNTRY == 'fr':
    class Arrondissement(models.Model):
        name = models.CharField(u"Nom", max_length=30)
        department = models.ForeignKey(Departement, verbose_name=u"Département")

        def __unicode__(self):
            return JOINT.join((self.name, unicode(self.department)))

    class Canton(models.Model):
        name = models.CharField(u"Nom", max_length=30)
        arrondissement = models.ForeignKey(Arrondissement,
                                           verbose_name=u"Arrondissement")
        def __unicode__(self):
            return JOINT.join((self.name, unicode(self.arrondissement)))

class Town(models.Model):
    name = models.CharField(_(u"Name"), max_length=100)
    surface = models.IntegerField(_(u"Surface (m²)"), blank=True, null=True)
    center = models.PointField(_(u"Localisation"), srid=settings.SRID,
                               blank=True, null=True)
    if settings.COUNTRY == 'fr':
        numero_insee = models.CharField(u"Numéro INSEE", max_length=6,
                                        unique=True)
        departement = models.ForeignKey(Departement, verbose_name=u"Département",
                                       null=True, blank=True)
        canton = models.ForeignKey(Canton, verbose_name=u"Canton", null=True,
                                   blank=True)
    objects = models.GeoManager()

    class Meta:
        verbose_name = _(u"Town")
        verbose_name_plural = _(u"Towns")
        if settings.COUNTRY == 'fr':
            ordering = ['numero_insee']

    def __unicode__(self):
        if settings.COUNTRY == "fr":
            return u"%s (%s)" % (self.name, self.numero_insee)
        return self.name

class TreatmentType(GeneralType):
    virtual = models.BooleanField(_(u"Virtual"))
    class Meta:
        verbose_name = _(u"Treatment type")
        verbose_name_plural = _(u"Treatment types")

class Treatment(BaseHistorizedItem, OwnPerms):
    container = models.ForeignKey(Container, verbose_name=_(u"Container"),
                                  blank=True, null=True)
    description = models.TextField(_(u"Description"), blank=True, null=True)
    treatment_type = models.ForeignKey(TreatmentType,
                                       verbose_name=_(u"Treatment type"))
    location = models.ForeignKey(Warehouse, verbose_name=_(u"Location"),
                                 blank=True, null=True)
    person = models.ForeignKey(Person, verbose_name=_(u"Person"),
                               blank=True, null=True)
    start_date = models.DateField(_(u"Start date"), blank=True, null=True)
    end_date = models.DateField(_(u"End date"), blank=True, null=True)
    history = HistoricalRecords()

    class Meta:
        verbose_name = _(u"Treatment")
        verbose_name_plural = _(u"Treatments")
        permissions = (
            ("view_own_treatment", ugettext(u"Can view own Treatment")),
            ("add_own_treatment", ugettext(u"Can add own Treatment")),
            ("change_own_treatment", ugettext(u"Can change own Treatment")),
            ("delete_own_treatment", ugettext(u"Can delete own Treatment")),
        )

class TreatmentSource(Source):
    class Meta:
        verbose_name = _(u"Treatment documentation")
        verbose_name_plural = _(u"Treament documentations")
    treatment = models.ForeignKey(Treatment, verbose_name=_(u"Treatment"),
                             related_name="source")

class Property(LightHistorizedItem):
    item = models.ForeignKey(Item, verbose_name=_(u"Item"))
    administrative_act = models.ForeignKey(AdministrativeAct,
                                         verbose_name=_(u"Administrative act"))
    person = models.ForeignKey(Person, verbose_name=_(u"Person"))
    start_date = models.DateField(_(u"Start date"))
    end_date = models.DateField(_(u"End date"))

    class Meta:
        verbose_name = _(u"Property")
        verbose_name_plural = _(u"Properties")

    def __unicode__(self):
        return self.person + JOINT + self.item