SGJP / Kuznia

# -*- coding: utf-8 -*-
import json
from collections import OrderedDict
from itertools import izip

from django.conf import settings
from django.contrib.auth.models import User, Permission, AnonymousUser
from django.db.models import Manager, Model, CharField, ForeignKey, \
    IntegerField, BooleanField, ManyToManyField, TextField, DateTimeField, F
from django.utils.translation import ugettext_lazy as _, get_language

from accounts.util import users_with_perm
from common.models import NotDeletedManager
from common.util import no_history
from dictionary.util import prepare_table
from patterns.models import InflectionType, BaseFormLabel, PatternType, Pattern


class LexemeNotDeletedManager(Manager):
    use_for_related_field = True

    def get_queryset(self):
        return super(LexemeNotDeletedManager, self).get_queryset().filter(
            lexeme__deleted=False)


class MultilingualText(Model):
    text_id = CharField(max_length=128, unique=True)

    def translation(self, language_code=None):
        if language_code is None:
            language_code = get_language()
        tr_set = self.translatedtext_set.filter(language_code=language_code)
        if tr_set:
            return tr_set.get().text
        else:
            return self.text_id

    def add_translated_texts(self):
        for code, name in settings.LANGUAGES:
            TranslatedText.objects.get_or_create(
                multilingual_text=self, language_code=code,
                defaults={'text': self.text_id})


class TranslatedText(Model):
    multilingual_text = ForeignKey(MultilingualText)
    language_code = CharField(max_length=16)
    text = CharField(max_length=128)


# nie podoba mi się mnożenie różnych podziałów części mowy, ale tak każą
class POSName(Model):
    abbr = CharField(max_length=16)
    extended = CharField(max_length=128)


class PartOfSpeech(Model):
    symbol = CharField(primary_key=True, max_length=16, db_column='pos')
    lexical_class = ForeignKey(InflectionType, db_column='czm')
    full_name = CharField(max_length=128, db_column='nazwa')
    pos_name = ForeignKey(POSName)
    index = IntegerField()
    color_scheme = IntegerField()

    def __unicode__(self):
        return self.symbol

    class Meta:
        db_table = 'klasygramatyczne'
        ordering = ['index']


class QualifierExclusionClass(Model):
    name = CharField(
        unique=True, max_length=64, db_column='nazwa', verbose_name=_(u'name'))
    vocabulary = ForeignKey(
        'Vocabulary', db_column='slownik', verbose_name=_(u'dictionary'))

    def __unicode__(self):
        return self.name

    class Meta:
        db_table = 'klasy_wykluczania'


def get_exclusion_classes():
    exclusion_classes = {}
    for ec in QualifierExclusionClass.objects.all():
        qualifiers = ec.qualifier_set.all()
        if qualifiers:
            q_list = [q.pk for q in qualifiers]
            exclusion_classes[ec.pk] = q_list
    return exclusion_classes


# kwalifikatory dla leksemów, odmian,
# zakonczen i form wyjatkowych
class Qualifier(Model):
    TYPE_STYLE = 'styl'
    TYPE_SCOPE = 'zakr'
    TYPE_FORM = 'form'
    TYPE_CHOICES = (
        (TYPE_STYLE, _('stylistic')),
        (TYPE_SCOPE, _('scope')),
        (TYPE_FORM, _('at forms')),
    )

    label = CharField(max_length=64, db_column='kwal', verbose_name=_(u'name'))
    type = CharField(
        max_length=4, choices=TYPE_CHOICES, verbose_name=_(u'type'))
    vocabulary = ForeignKey(
        'Vocabulary', db_column='slownik', verbose_name=_(u'dictionary'),
        related_name='qualifiers')
    exclusion_class = ForeignKey(
        QualifierExclusionClass, db_column='klasa', null=True, blank=True,
        verbose_name=_(u'exclusion class'))
    deleted = BooleanField(db_column='usuniety', default=False)

    objects = NotDeletedManager()
    all_objects = Manager()

    def is_empty(self):
        return not (
            self.lexeme_set.exists() or
            self.ending_set.exists() or
            self.lexemeinflectionpattern_set.exists())

    def set_for(self, something, add):
        if add:
            if self.exclusion_class:
                qualifiers = (something.qualifiers.all() &
                              self.exclusion_class.qualifier_set.all())
                if qualifiers.count() > 0 and list(qualifiers) != [self]:
                    return False
            if self in something.qualifiers.all():
                return False
            else:
                something.qualifiers.add(self)  # add
                return True
        else:
            if self in something.qualifiers.all():
                something.qualifiers.remove(self)  # add
                return True
            else:
                return False

    def __unicode__(self):
        # return u'%s (%s)' % (self.label, self.vocabulary.id)
        return self.label

    @staticmethod
    def visible_qualifiers(user):
        return Qualifier.objects.filter(
            vocabulary__in=Vocabulary.visible_vocabularies(user))

    @staticmethod
    def editable_qualifiers(user):
        return Qualifier.objects.filter(
            vocabulary__in=Vocabulary.editable_vocabularies(user))

    class Meta:
        unique_together = ('label', 'vocabulary')
        db_table = 'kwalifikatory'
        ordering = ['label']


class Classification(Model):
    name = CharField(
        unique=True, max_length=64, db_column='nazwa',
        verbose_name=_(u'classification name'))
    multilingual_name = ForeignKey(MultilingualText, null=True)
    parts_of_speech = ManyToManyField(PartOfSpeech)

    def value_tree(self):
        parts = []
        all_values = self.values.select_related('parent_node') \
            .prefetch_related('child_nodes')
        for v in all_values:
            if v.parent_node is None:
                parts.append(v.subtree(all_values))
        return parts

    def make_choices(self):
        return _make_choices(self.value_tree())

    def __unicode__(self):
        return self.name

    class Meta:
        db_table = 'klasyfikacje'


def _make_choices(tree):
    choices = []
    for value, subtree in tree:
        choices.append((value.pk, value.label))
        subchoices = _make_choices(subtree)
        nbsp = u'    '
        choices += [(pk, nbsp + label) for (pk, label) in subchoices]
    return choices


class ClassificationValue(Model):
    label = CharField(
        unique=True, max_length=64, db_column='nazwa',
        verbose_name=_(u'value name'))
    classification = ForeignKey(
        Classification, db_column='klas_id', related_name='values')
    parent_node = ForeignKey(
        'self', db_column='rodzic', null=True, blank=True,
        verbose_name=_(u'parent value'), related_name='child_nodes')
    lexemes = ManyToManyField('Lexeme', blank=True, through='LexemeCV')
    deleted = BooleanField(db_column='usunieta', default=False)

    objects = NotDeletedManager()
    all_objects = Manager()

    def subtree(self, all_values):
        subtrees = []
        for child in all_values:
            if child in self.child_nodes.all():
                subtrees.append(child.subtree(all_values))
        return self, subtrees

    def is_empty(self):
        return not self.lexemes.exists()

    def add_lexeme(self, lexeme):
        LexemeCV.objects.get_or_create(lexeme=lexeme, classification_value=self)

    def remove_lexeme(self, lexeme):
        LexemeCV.objects.filter(
            lexeme=lexeme, classification_value=self).delete()

    def __unicode__(self):
        return self.label

    class Meta:
        db_table = 'wartosci_klasyfikacji'
        ordering = ['label']


class LexemeCV(Model):
    lexeme = ForeignKey('Lexeme')
    classification_value = ForeignKey('ClassificationValue')

    objects = LexemeNotDeletedManager()
    all_objects = Manager()

    class Meta:
        unique_together = ['lexeme', 'classification_value']


class BorrowingSource(Model):
    label = CharField(max_length=32)

    def __unicode__(self):
        return self.label


# śmieć, trzeba trzymać ze względów historycznych
class InflectionCharacteristic(Model):
    symbol = CharField(max_length=16, blank=True, db_column='charfl')
    part_of_speech = ForeignKey(PartOfSpeech, db_column='pos')
    basic_form_label = ForeignKey(BaseFormLabel, db_column='efobaz')

    def __unicode__(self):
        return '%s:%s' % (self.symbol, self.part_of_speech_id)

    class Meta:
        db_table = 'charfle'
        unique_together = ('symbol', 'part_of_speech')


class Gender(Model):
    symbol = CharField(max_length=4, unique=True)
    basic_form_label = ForeignKey(BaseFormLabel)

    def __unicode__(self):
        return self.symbol


class PatternExample(Model):
    pattern = ForeignKey(Pattern)
    gender = ForeignKey(Gender)
    lexeme = ForeignKey('Lexeme')

    class Meta:
        unique_together = ('pattern', 'gender')
        ordering = ['gender']


class Lexeme(Model):
    STATUS_CANDIDATE = 'cand'
    STATUS_DESCRIBED = 'desc'
    STATUS_CONFIRMED = 'conf'
    STATUS_LITTER = 'litt'
    STATUS_CHOICES = (
        (STATUS_CANDIDATE, _(u'candidate')),
        (STATUS_DESCRIBED, _(u'entered')),
        (STATUS_CONFIRMED, _(u'confirmed')),
        (STATUS_LITTER,    _(u'litter')),
    )
    HIDDEN_STATUSES = (STATUS_CANDIDATE, STATUS_LITTER)

    entry = CharField(
        max_length=64, db_column='haslo', db_index=True,
        verbose_name=_(u'entry'))
    # id w źródłowej bazie
    source_id = IntegerField(blank=True, null=True)
    # pozostałość historyczna:
    entry_suffix = CharField(
        blank=True, max_length=16, db_column='haslosuf',
        verbose_name=_(u'entry suffix'))
    gloss = TextField(blank=True, db_column='glosa', verbose_name=_(u'gloss'))
    note = TextField(blank=True, db_column='nota', verbose_name=_(u'note'))
    extended_note = TextField(blank=True, verbose_name=_(u'extended note'))
    pronunciation = TextField(
        blank=True, db_column='wymowa', verbose_name=_(u'pronunciation'))
    valence = TextField(blank=True, verbose_name=_(u'valence'))
    homonym_number = IntegerField(db_column='hom', default=1)
    part_of_speech = ForeignKey(
        PartOfSpeech, db_column='pos', verbose_name=_(u'POS'))
    owner_vocabulary = ForeignKey(
        'Vocabulary', db_column='slownik', related_name='owned_lexemes')
    source = CharField(
        max_length=64, blank=True, db_column='zrodlo',
        verbose_name=_(u'source'))
    borrowing_source = ForeignKey(
        BorrowingSource, blank=True, null=True,
        verbose_name=_(u'borrowing source'))
    status = CharField(max_length=8, db_column='status', choices=STATUS_CHOICES)
    qualifiers = ManyToManyField(
        Qualifier, blank=True, db_table='kwalifikatory_leksemow')
    qualifiers_dor = TextField(blank=True, verbose_name=_(u'Dor. qual.'))
    qualifiers_style = TextField(blank=True, verbose_name=_(u'styl. qual.'))
    qualifiers_scope = TextField(blank=True, verbose_name=_(u'scope qual.'))
    # czy termin specjalistyczny
    specialist = BooleanField(default=False, verbose_name=_(u'specialist'))
    comment = TextField(
        blank=True, db_column='komentarz', verbose_name=_(u'comment'))
    last_modified = DateTimeField(auto_now=True, db_column='data_modyfikacji')
    # osoba, ktora ostatnia zmieniala opis leksemu
    responsible = ForeignKey(
        User, blank=True, null=True, db_column='odpowiedzialny')
    patterns = ManyToManyField(Pattern, through='LexemeInflectionPattern')
    qualifiers_cache = ManyToManyField(
        Qualifier, through='LexemeFormQualifier', related_name='all_lexemes')
    deleted = BooleanField(db_column='usuniety', default=False)

    objects = NotDeletedManager()
    all_objects = Manager()

    def inflection_tables(self, variant, qualifiers=None):
        lips = self.lexemeinflectionpattern_set.order_by(
            'index').select_related('gender', 'pattern')
        genders = OrderedDict()
        for lip in lips:
            g = lip.gender
            if g not in genders:
                genders[g] = {'patterns': [], 'pronunciations': []}
            genders[g]['patterns'].append(lip.pattern)
            if lip.pronunciation:
                genders[g]['pronunciations'].append(lip.pronunciation)
        return [
            (gender, val['patterns'], val['pronunciations']) +
            self.inflection_table(variant, gender, qualifiers=qualifiers)
            for gender, val in genders.iteritems()]

    def inflection_table(self, variant, gender, qualifiers=None):
        lips = self.lexemeinflectionpattern_set.prefetch_related(
            'qualifiers').select_related('pattern__type', 'gender')
        if gender:
            lips = lips.filter(gender=gender)
        span = unicode(variant) == u'0'
        gender_qualifiers = lips[0].qualifiers.all() & qualifiers
        attr = LexemeAttribute.objects.get(name=u'nacechowana forma')
        depr = self.attribute_value(attr)
        tables = [
            lip.inflection_table(
                variant, qualifiers=qualifiers, span=span,
                depr=depr, cell_qualifier=True,
                edit_view=(i == 0))  # brzydko, ale cóż
            for i, lip in enumerate(lips)]
        table1 = tables[0]
        for table2 in tables[1:]:
            while len(table2) > len(table1):
                table1.append([])
            for row1, row2 in zip(table1, table2):
                while len(row2) > len(row1):
                    row1.append({'type': 'empty'})
                for cell1, cell2 in zip(row1, row2):
                    if cell1['type'] == 'forms':
                        assert cell2['type'] in ('forms', 'empty')
                        if cell2['type'] == 'forms':
                            cell1['forms'].extend(cell2['forms'])
                    elif cell1['type'] == 'label':
                        assert cell2['type'] in ('label', 'empty')
                        if cell2['type'] == 'label':
                            cell1['label'].extend(cell2['label'])
                    elif cell1['type'] == 'empty':
                        cell1.update(cell2)
        prepare_table(table1)
        return gender_qualifiers, table1

    def all_forms(self, label_filter=None, variant='1'):
        forms = set()
        for lip in self.lexemeinflectionpattern_set.all():
            forms |= set(
                form for (indexes, form, qualifiers)
                in lip.all_forms(label_filter=label_filter, variant=variant))
        return forms

    def refresh_forms(self):
        self.lexemeform_set.all().delete()
        for form in self.all_forms():
            self.lexemeform_set.add(LexemeForm(form=form.strip('+')))

    def all_qualifiers(self, variant='1'):
        qualifiers = set(self.qualifiers.all())
        for lip in self.lexemeinflectionpattern_set.all():
            qualifiers |= set(
                qualifier for (indexes, form, qualifiers)
                in lip.all_forms(variant=variant)
                for qualifier in qualifiers)
        return qualifiers

    def refresh_qualifiers_cache(self):
        self.lexemeformqualifier_set.all().delete()
        for qualifier in self.all_qualifiers():
            self.lexemeformqualifier_set.create(qualifier=qualifier)

    def refresh_data(self):
        self.refresh_forms()
        self.refresh_qualifiers_cache()

    def get_root(self, pattern, gender=None):
        return pattern.get_root(self.entry, gender)

    def visible_vocabularies(self, user):
        return Vocabulary.visible_vocabularies(user) & self.vocabularies.all()

    def editable_vocabularies(self, user):
        return Vocabulary.editable_vocabularies(user) & self.vocabularies.all()

    def change_owner(self, new_owner):
        old_owner = self.owner_vocabulary
        new_owner.add_lexeme(self)
        self.owner_vocabulary = new_owner
        old_owner.remove_lexeme(self)

    def classification_values(self, classification):
        return self.classificationvalue_set.filter(
            classification=classification)

    def pattern_list(self):
        lips = self.lexemeinflectionpattern_set.all()
        patterns = []
        for lip in lips:
            if patterns == [] or lip.pattern != patterns[-1]:
                patterns.append(lip.pattern)
        return patterns

    def lip_data(self, lips=None):
        if lips is None:
            lips = self.lexemeinflectionpattern_set.all()
        patterns = []
        genders = []
        for lip in lips:
            if patterns == [] or lip.pattern.name != patterns[-1]:
                patterns.append(lip.pattern.name)
            if (lip.gender and
                    (genders == [] or lip.gender.symbol != genders[-1])):
                genders.append(lip.gender.symbol)
        patterns = '/'.join(patterns)
        genders = '/'.join(genders)
        return {'patterns': patterns, 'genders': genders}

    def vocab_list(self):
        owner = self.owner_vocabulary
        vocab_list = [owner.id]
        vocab_list += list(
            self.vocabularies.exclude(id=owner.id).values_list('id', flat=True))
        return vocab_list

    def fix_homonym_number(self):
        homonym_numbers = (Lexeme.objects.filter(
            entry=self.entry, part_of_speech=self.part_of_speech)
            .exclude(pk=self.pk)).values_list('homonym_number', flat=True)
        for i in xrange(1, len(homonym_numbers) + 2):
            if i not in homonym_numbers:
                self.homonym_number = i
                self.save()
                break
        this_hn = HomonymNumber.objects.filter(
            lexeme=self, variant_id='Morfeusz')
        this_number = this_hn.get().number if this_hn else None
        letter = HomonymNumber.MORFEUSZ_LETTERS_REVERSE.get(
            self.part_of_speech_id)
        if letter:
            pos_list = HomonymNumber.MORFEUSZ_LETTERS[letter]
            homonyms = Lexeme.objects.filter(
                entry=self.entry, part_of_speech_id__in=pos_list)
            if homonyms:
                numbers = set()
                need_numbers = []
                for homonym in homonyms:
                    if homonym != self:
                        hn = HomonymNumber.objects.filter(
                            lexeme=homonym, variant_id='Morfeusz')
                        if hn:
                            numbers.add(hn.get().number)
                        else:
                            need_numbers.append(homonym)
                for homonym in need_numbers:
                    for i in xrange(1, len(numbers) + 2):
                        if i not in numbers and i != this_number:
                            HomonymNumber.objects.create(
                                lexeme=homonym, variant_id='Morfeusz',
                                number=i)
                            numbers.add(i)
                if not this_hn or this_number in numbers:
                    for i in xrange(1, len(numbers) + 2):
                        if i not in numbers:
                            if not this_hn:
                                HomonymNumber.objects.create(
                                    lexeme=self, variant_id='Morfeusz',
                                    number=i)
                            else:
                                this_hn = this_hn.get()
                                this_hn.number = i
                                this_hn.save()
                            break

    def get_variant_homonym(self, variant_id):
        hom = HomonymNumber.objects.filter(lexeme=self, variant_id=variant_id)
        if hom:
            return hom.get().number
        else:
            return None

    def homonym_count(self, user=None):
        lexemes = Lexeme.objects.filter(entry=self.entry).exclude(pk=self.pk)
        if user is not None:
            lexemes = Lexeme.filter_visible(lexemes, user)
        return lexemes.count()

    def attributes(self, part_of_speech=None, genders=None):
        pos = part_of_speech or self.part_of_speech
        if genders is None and pos.lexical_class_id == 'subst':
            lips = self.lexemeinflectionpattern_set.all()
            genders = [lip.gender for lip in lips]
        elif genders is None:
            genders = []
        attrs = LexemeAttribute.objects.all()
        attrs = attrs.filter(parts_of_speech=pos)
        attrs = (attrs.filter(genders__in=genders) |
                 attrs.filter(takes_gender=False))
        return attrs

    def attributes_values(self, part_of_speech=None, genders=None):
        for attr in self.attributes(part_of_speech, genders):
            yield (attr, self.attribute_value(attr))

    def attribute_value(self, attribute):
        if attribute.multiple:
            return attribute.values.filter(lexemes=self)
        else:
            try:
                return attribute.values.get(lexemes=self)
            except LexemeAttributeValue.DoesNotExist:
                return None

    def add_cross_reference(self, to_lexeme, type_symbol):
        cr_type = CrossReferenceType.objects.get(
            symbol=type_symbol, from_pos_id=self.part_of_speech_id,
            to_pos_id=to_lexeme.part_of_speech_id)
        CrossReference.objects.create(
            from_lexeme=self, to_lexeme=to_lexeme, type=cr_type)

    def perm(self, user, action):
        if action == 'view':
            if not user.is_authenticated() and not self.is_public():
                return False
            return bool(self.visible_vocabularies(user))
        elif action == 'change':
            priority = user.has_perm('dictionary.lexeme_priority')
            priority |= not (
                self.responsible and
                self.responsible.has_perm('dictionary.lexeme_priority'))
            edit_vocab = self.owner_vocabulary in \
                Vocabulary.editable_vocabularies(user)
            return edit_vocab and priority

    def undelete(self):
        no_history()
        self.deleted = False
        self.fix_homonym_number()
        self.save()
        self.history_set.get(column_name='usuniety', old_value='false').delete()

    def sgjp_info(self):
        commonness = Classification.objects.get(name=u'pospolitość')
        commonness_labels = list(self.classification_values(
            commonness).values_list('label', flat=True))
        if commonness_labels == ['nazwa pospolita']:
            commonness_labels = []
        return {
            'SJPDor': bool(self.vocabularies.filter(id='SJPDor')),
            'commonness': commonness_labels,
            'qualifiers': self.qualifiers.values_list('label', flat=True),
        }

    def status_desc(self):
        return dict(self.STATUS_CHOICES)[self.status]

    def cross_references(self, user):
        return self.refs_to.order_by('type__index').distinct().filter(
            to_lexeme__vocabularies__in=Vocabulary.visible_vocabularies(user))

    def is_public(self):
        return self.status not in Lexeme.HIDDEN_STATUSES

    def __unicode__(self):
        return '%s (%s)' % (self.entry, self.part_of_speech.symbol)

    @staticmethod
    def filter_visible(lexemes, user):
        vocab_ids = [v.id for v in Vocabulary.visible_vocabularies(user)]
        # uniknięcie podzapytania *bardzo* zwiększa wydajność!
        if not user.is_authenticated():
            lexemes = lexemes.exclude(status__in=Lexeme.HIDDEN_STATUSES)
        return lexemes.filter(vocabularies__id__in=vocab_ids).distinct()

    @staticmethod
    def filter_reader(lexemes):
        return Lexeme.filter_visible(lexemes, AnonymousUser())

    class Meta:
        db_table = 'leksemy'
        permissions = (
            ('view_lexeme', _(u'Can view lexemes')),
            ('view_all_lexemes', _(u'Can view all lexemes')),
            ('lexeme_priority',
             _(u'Decisive lexeme modifications')),
            ('export_lexemes', _(u'Can export lexemes')),
        )


class LexemeAttribute(Model):
    name = CharField(max_length=32, unique=True)
    name_gender = CharField(max_length=2, default='n')
    multilingual_name = ForeignKey(MultilingualText, null=True)
    closed = BooleanField(default=False)  # czy jest zamknięta lista wartości
    multiple = BooleanField(default=False)
    required = BooleanField(default=False)
    parts_of_speech = ManyToManyField(PartOfSpeech)
    takes_gender = BooleanField(default=False)
    genders = ManyToManyField(Gender, blank=True)

    def add_lexeme(self, lexeme, value):
        assert not self.multiple
        val, created = LexemeAttributeValue.objects.get_or_create(
            value=value, attribute=self)
        LexemeAV.objects.update_or_create(
            lexeme=lexeme, attribute_value__attribute=self,
            defaults={'attribute_value': val})

    def __unicode__(self):
        return self.name


class LexemeAttributeValue(Model):
    value = CharField(max_length=128, blank=True)
    display_value = CharField(max_length=64, blank=True)
    attribute = ForeignKey(LexemeAttribute, related_name='values')
    lexemes = ManyToManyField(Lexeme, blank=True, through='LexemeAV')

    def add_lexeme(self, lexeme):
        LexemeAV.objects.get_or_create(lexeme=lexeme, attribute_value=self)

    def remove_lexeme(self, lexeme):
        LexemeAV.objects.filter(lexeme=lexeme, attribute_value=self).delete()

    def __unicode__(self):
        return self.value

    class Meta:
        ordering = ['value']


class LexemeAV(Model):
    lexeme = ForeignKey('Lexeme')
    attribute_value = ForeignKey('LexemeAttributeValue')

    objects = LexemeNotDeletedManager()
    all_objects = Manager()

    class Meta:
        unique_together = ['lexeme', 'attribute_value']


class LexemeInflectionPattern(Model):
    lexeme = ForeignKey(Lexeme, db_column='l_id')
    index = IntegerField(db_column='oind')
    pattern = ForeignKey(Pattern, db_column='w_id', verbose_name=_(u'pattern'))
    gender = ForeignKey(
        Gender, verbose_name=_(u'gender'), blank=True, null=True)
    root = CharField(max_length=64, db_column='rdzen')
    qualifiers = ManyToManyField(
        Qualifier, blank=True, db_table='kwalifikatory_odmieniasiow')
    pronunciation = CharField(
        max_length=64, verbose_name=_(u'pronunciation'), blank=True)

    objects = LexemeNotDeletedManager()
    all_objects = Manager()

    def table_template(self, variant, attr_vals=None, pos=None):
        part_of_speech = pos or self.lexeme.part_of_speech
        tts = TableTemplate.objects.filter(
            parts_of_speech=part_of_speech, variant=variant,
            pattern_types=self.pattern.type)
        if attr_vals is None:
            l_attr_vals = list(self.lexeme.lexemeattributevalue_set.values_list(
                'id', flat=True))
        else:
            l_attr_vals = attr_vals.values_list('id', flat=True)
        relevant_attr_vals = list(LexemeAttributeValue.objects.filter(
            attribute__parts_of_speech=part_of_speech).exclude(
            tabletemplate=None).filter(id__in=l_attr_vals))
        for attr_val in relevant_attr_vals:
            tts = tts.filter(attribute_values=attr_val)
        try:
            return tts.get()
        except TableTemplate.MultipleObjectsReturned:
            return None
        except TableTemplate.DoesNotExist:
            return None

    def cells(self, variant='1'):
        tt = self.table_template(variant)
        if not tt:
            return []
        return tt.filter_cells(
            self.pattern.type, self.gender,
            self.lexeme.lexemeattributevalue_set.all())

    def base_endings(self, label_filter=None):
        return self.pattern.base_endings(label_filter)

    def inflection_table(self, variant, edit_view=False, attr_vals=None,
                         pos=None, depr=None, **kwargs):
        part_of_speech = pos or self.lexeme.part_of_speech
        tt = self.table_template(
            variant, attr_vals=attr_vals, pos=part_of_speech)
        if tt is None:
            return []
        lip_qualifiers = self.qualifiers.all() if not edit_view else []
        if attr_vals is None:
            attr_vals = self.lexeme.lexemeattributevalue_set.all()
        if depr and (not self.gender or self.gender.symbol != 'm1'):
            depr = None
        return tt.render_with_pattern(
            self.pattern, self.gender, attr_vals,
            root=self.root, edit_view=edit_view, lip_index=self.index,
            lip_qualifiers=lip_qualifiers, depr=depr, **kwargs)

    def all_forms(self, label_filter=None, variant='1', **kwargs):
        forms = []
        base_endings = self.base_endings(label_filter)
        for cell in self.cells(variant=variant):
            forms += cell.forms(
                base_endings=base_endings, root=self.root,
                lip_qualifiers=self.qualifiers.all(), lip_index=self.index,
                **kwargs)
        return forms

    def editable_vocabularies(self, user):
        return self.lexeme.editable_vocabularies(user)

    def get_root(self):
        return self.lexeme.get_root(self.pattern, self.gender)

    def __unicode__(self):
        return '%s : %s/%s : %s' % (
            self.lexeme.entry,
            self.pattern.name,
            self.pattern.type.symbol,
            self.gender.symbol if self.gender else '',
        )

    @staticmethod
    def filter_visible(lips, user):
        vocabs = Vocabulary.visible_vocabularies(user)
        if not user.is_authenticated():
            lips = lips.exclude(lexeme__status__in=Lexeme.HIDDEN_STATUSES)
        return lips.filter(lexeme__vocabularies__in=vocabs).distinct()

    class Meta:
        db_table = 'odmieniasie'
        unique_together = ('lexeme', 'index')
        ordering = ['index']


def combine_qualifiers(lip_qualifiers, e_qualifiers):
    # qualifiers = set(l_qualifiers)
    if not lip_qualifiers:
        return e_qualifiers
    qualifiers = set()
    for q in list(lip_qualifiers) + list(e_qualifiers):
        if q.exclusion_class:
            excluded = set(q.exclusion_class.qualifier_set.all())
            qualifiers -= excluded
        qualifiers.add(q)
    return qualifiers


# Sluzy do doczepienia flag do poszczegolnych form
# poszczegolnych leksemow
# class UncommonForm(Model):
#     lexeme_inflection_pattern = ForeignKey(
#         LexemeInflectionPattern, db_column='o_id')
#     # raczej tag, ale z jakiego tagsetu ?
#     # base_form_label/tag =
#     qualifiers = ManyToManyField(
#         Qualifier, blank=True, db_table='kwalifikatory_form')
#
#     class Meta:
#         db_table = 'formy_wyjatkowe'
#         unique_together = (
#             'lexeme_inflection_pattern',
#             'tag',
#         )


class Vocabulary(Model):
    id = CharField(max_length=64, primary_key=True, db_column='slownik')
    description = TextField()
    lexemes = ManyToManyField(Lexeme, blank=True, through='LexemeAssociation',
                              related_name='vocabularies')
    managers = ManyToManyField(
        User, blank=True, related_name='managed_vocabularies')
    viewers = ManyToManyField(
        User, blank=True, related_name='visible_vocabularies')
    editors = ManyToManyField(
        User, blank=True, related_name='editable_vocabularies')
    # bardziej by pasowało w Classification, ale już trudno
    classifications = ManyToManyField(
        Classification, blank=True, related_name='vocabularies')

    def owned_lexemes_pk(self):
        return self.owned_lexemes.values_list('pk', flat=True)

    def all_viewers(self):
        perm = Permission.objects.get(codename='view_all_lexemes')
        return self.viewers.all().distinct() | users_with_perm(perm)

    def all_editors(self):
        return self.editors.all()

    def all_managers(self):
        perm = Permission.objects.get(codename='manage_all_vocabularies')
        return self.managers.all().distinct() | users_with_perm(perm)

    def add_lexeme(self, lexeme):
        la, created = LexemeAssociation.objects.get_or_create(
            lexeme=lexeme, vocabulary=self)
        return created

    def remove_lexeme(self, lexeme):
        assert self != lexeme.owner_vocabulary
        LexemeAssociation.objects.filter(
            lexeme=lexeme, vocabulary=self).delete()

    def set_lexeme(self, lexeme, add):
        if add:
            self.add_lexeme(lexeme)
        else:
            self.remove_lexeme(lexeme)

    def __unicode__(self):
        return self.id

    @staticmethod
    def visible_vocabularies(user):
        if user.has_perm('dictionary.view_all_lexemes'):
            return Vocabulary.objects.all()
        elif user.is_authenticated():
            return user.visible_vocabularies.all()
        else:
            return Vocabulary.objects.filter(id='SGJP')

    @staticmethod
    def editable_vocabularies(user):
        return user.editable_vocabularies.all()

    @staticmethod
    def readonly_vocabularies(user):
        return Vocabulary.visible_vocabularies(user).exclude(
            id__in=Vocabulary.editable_vocabularies(user))

    @staticmethod
    def managed_vocabularies(user):
        if user.has_perm('dictionary.manage_all_vocabularies'):
            return Vocabulary.objects.all()
        else:
            return user.managed_vocabularies.all()

    class Meta:
        db_table = 'slowniki'
        ordering = ['id']
        permissions = (
            ('manage_vocabulary', _(u'Can manage dictionaries')),
            ('manage_all_vocabularies', _(u'Manages all dictionaries')),
        )


class LexemeAssociation(Model):
    lexeme = ForeignKey(Lexeme, db_column='l_id')
    vocabulary = ForeignKey(Vocabulary, db_column='slownik')

    objects = LexemeNotDeletedManager()
    all_objects = Manager()

    def __unicode__(self):
        return '%s/%s' % (self.lexeme.entry, self.vocabulary.id)

    class Meta:
        db_table = 'leksemy_w_slownikach'
        unique_together = ['lexeme', 'vocabulary']


# powinno być w tabeli, ale na razie nie chcemy zmieniać struktury
REVERSE_CR_TYPE = {
    'verpact': 'pactver',
    'verppas': 'ppasver',
    'verger': 'gerver',
    'adjosc': 'oscadj',
    'adjadv': 'advadj',
    'adjadvc': 'advcadj',
    'adjcom': 'comadj',
    'adjnie': 'nieadj',
    'adjsubst': 'substadj',

    'advcom': 'comadv',
    'masfem': 'femmas',
    'veripp': 'ippver',
    'warstd': 'warnstd',

    'asp': 'asp',
    'warleks': 'warleks',
    'warpis': 'warpis',
    'warrodz': 'warrodz',
    # zdrobod, zgrubod -- brak zwrotnych odsyłaczy
}

for cr_symbol, rev_symbol in list(REVERSE_CR_TYPE.iteritems()):
    REVERSE_CR_TYPE[rev_symbol] = cr_symbol


class CrossReferenceType(Model):
    symbol = CharField(max_length=10, db_column='typods')
    desc = CharField(max_length=40, db_column='naglowek')
    index = IntegerField(db_column='kolejnosc')
    from_pos = ForeignKey(
        PartOfSpeech, db_column='pos1', related_name='crtype_to')
    to_pos = ForeignKey(
        PartOfSpeech, db_column='pos2', related_name='crtype_from')
    # reverse = ForeignKey('self', db_column='odwrotny')

    def __unicode__(self):
        return self.symbol

    def reversed(self):
        if self.symbol not in REVERSE_CR_TYPE:
            return None
        rev_symbol = REVERSE_CR_TYPE[self.symbol]
        return CrossReferenceType.objects.get(
            symbol=rev_symbol, from_pos=self.to_pos, to_pos=self.from_pos)

    class Meta:
        db_table = 'typyodsylaczy'


class CRManager(Manager):
    use_for_related_field = True

    def get_queryset(self):
        return super(CRManager, self).get_queryset().filter(
            from_lexeme__deleted=False, to_lexeme__deleted=False)


class CrossReference(Model):
    from_lexeme = ForeignKey(
        Lexeme, db_column='l_id_od', related_name='refs_to')
    to_lexeme = ForeignKey(
        Lexeme, db_column='l_id_do', related_name='refs_from',
        verbose_name=_(u'targer number'))
    type = ForeignKey(
        CrossReferenceType, db_column='typods_id', verbose_name=_(u'type'))

    objects = CRManager()
    all_objects = Manager()

    def reversed(self):
        rev_type = self.type.reversed()
        if rev_type:
            return self.to_lexeme.refs_to.filter(
                to_lexeme=self.from_lexeme, type=rev_type)
        else:
            return CrossReference.objects.none()

    def __unicode__(self):
        return '%s: %s -> %s' % (
            self.type.symbol, self.from_lexeme.entry, self.to_lexeme.entry)

    class Meta:
        db_table = 'odsylacze'


class Variant(Model):
    TYPE_TABLE = 'table'
    TYPE_EXPORT = 'export'
    TYPE_CHOICES = (
        (TYPE_TABLE, 'tabelka'),
        (TYPE_EXPORT, 'eksport'),
    )

    id = CharField(max_length=32, primary_key=True, db_column='wariant')
    type = CharField(max_length=10, choices=TYPE_CHOICES)

    def __unicode__(self):
        return self.id

    class Meta:
        db_table = 'warianty'


class TableTemplate(Model):
    name = TextField()
    variant = ForeignKey(Variant)
    parts_of_speech = ManyToManyField(PartOfSpeech)
    pattern_types = ManyToManyField(PatternType)
    attributes = ManyToManyField(LexemeAttribute)
    attribute_values = ManyToManyField(LexemeAttributeValue)
    cell_attributes = ManyToManyField(LexemeAttribute, related_name='templates')
    takes_gender = BooleanField(default=False)

    def filter_cells_attr(self, cells, attr_vals):
        for attr in self.cell_attributes.all():
            attr_val = [a for a in attr_vals if a.attribute == attr]
            if len(attr_val) != 1:
                return []
            cells = cells.filter(attribute_values=attr_val[0])
        return cells

    def filter_cells(self, pattern_type, gender, attr_vals):
        if self.variant.type == Variant.TYPE_TABLE:
            cells = self.table_cells.filter(
                pattern_types=pattern_type).select_related('base_form_label')
        else:
            cells = self.export_cells.filter(
                pattern_types=pattern_type).select_related('base_form_label')
        if self.takes_gender and gender:
            cells = cells.filter(genders=gender)
        if attr_vals:
            cells = self.filter_cells_attr(cells, attr_vals)
        return cells

    def filter_table_headers(self, pattern_type, gender, attr_vals):
        headers = self.headers.filter(pattern_types=pattern_type)
        if self.takes_gender and gender:
            headers = headers.filter(genders=gender)
        if attr_vals:
            headers = self.filter_cells_attr(headers, attr_vals)
        return headers

    def render_with_pattern(self, pattern, *args, **kwargs):
        base_endings = pattern.base_endings()
        return self.render(
            pattern.type, *args, pattern=pattern, base_endings=base_endings,
            **kwargs)

    def render_with_pattern_type(self, pattern_type, *args, **kwargs):
        base_endings = pattern_type.dummy_base_endings()
        return prepare_table(self.render(
            pattern_type, *args, base_endings=base_endings, numbers=True,
            **kwargs))

    def render(self, pattern_type, gender, attr_vals, separated=False,
               numbers=False, pattern=None, **forms_kwargs):
        table_cells = self.filter_cells(pattern_type, gender, attr_vals)
        headers = self.filter_table_headers(pattern_type, gender, attr_vals)
        if table_cells is None or headers is None:
            return []
        rows = set()
        last_col = 0
        for table_cell in table_cells:
            rows.add(table_cell.row)
            col = table_cell.col + table_cell.colspan - 1
            if col > last_col:
                last_col = col
        for header in headers:
            rows.add(header.row)
            col = header.col + header.colspan - 1
            if col > last_col:
                last_col = col
        if numbers:
            last_col += 1
        table = [[{'type': 'empty'} for i in xrange(last_col)] for row in rows]
        rows = sorted(rows)
        if numbers:
            for row, table_row in izip(rows, table):
                table_row[0] = {
                    'type': 'header',
                    'label': [row],
                    'css_class': 'blank',
                    'rowspan': 1,
                    'colspan': 1}
        # słownik: nr rzędu w bazie -> rzeczywisty numer rzędu
        row_translate = dict((r, i) for i, r in enumerate(rows))
        for tc in table_cells:
            if numbers:
                x = tc.col
            else:
                x = tc.col - 1
            y = row_translate[tc.row]
            table_cell = table[y][x]
            assert table_cell['type'] != 'span'
            separator = u'·' if separated else u''
            forms = [f + (pattern,)
                     for f in tc.forms(separator=separator, **forms_kwargs)]
            if not forms:
                continue
            if table_cell['type'] == 'empty':
                table[y][x] = {
                    'type': 'forms',
                    'forms': forms,
                    'rowspan': tc.rowspan,
                    'colspan': tc.colspan,
                }
                for i in xrange(tc.colspan):
                    for j in xrange(tc.rowspan):
                        if (i, j) != (0, 0):
                            assert table[y + j][x + i]['type'] == 'empty'
                            table[y + j][x + i]['type'] = 'span'
            else:
                assert tc.rowspan == table_cell['rowspan']
                assert tc.colspan == table_cell['colspan']
                table_cell['forms'] += forms
        for header in headers:
            if numbers:
                x = header.col
            else:
                x = header.col - 1
            y = row_translate[header.row]
            assert table[y][x]['type'] == 'empty'
            table[y][x] = {
                'type': 'label',
                'label': [header.label],
                'css_class': header.css_class,
                'rowspan': header.rowspan,
                'colspan': header.colspan,
            }
            for i in xrange(header.colspan):
                for j in xrange(header.rowspan):
                    if (i, j) != (0, 0):
                        assert table[y + j][x + i]['type'] == 'empty'
                        table[y + j][x + i]['type'] = 'span'
        if numbers:
            first_row = [{
                'type': 'header',
                'label': [col if col != 0 else ''],
                'css_class': 'blank',
                'rowspan': 1,
                'colspan': 1} for col in xrange(last_col)]
            table = [first_row] + table
        return [row for row in table
                if not all(cell['type'] == 'empty' for cell in row)]

    def __unicode__(self):
        return self.name


class Cell(Model):
    base_form_label = ForeignKey(BaseFormLabel)
    prefix = CharField(max_length=20, blank=True)
    suffix = CharField(max_length=20, blank=True)

    def get_index(self):
        return None

    def get_qualifier(self):
        return ''

    def get_marked_attribute_values(self):
        return set()

    def forms(self, base_endings=None, separator=u'', root=u'',
              lip_qualifiers=None, lip_index=0, qualifiers=None,
              edit_view=False, span=False, depr=None, cell_qualifier=False):
        if qualifiers:
            qualifiers_set = set(qualifiers)

        def filter_quals(quals):
            if not qualifiers:
                return set(quals)
            else:
                return set(quals) & qualifiers_set

        if lip_qualifiers and not edit_view:
            # l_qual = filter_quals(lexeme_qualifiers)
            lip_qual = filter_quals(lip_qualifiers)
        else:
            lip_qual = set()
        endings = base_endings[self.base_form_label]
        if span:
            form_template = (
                '<span class="root">%s</span>'
                '%s<span class="ending">%s</span>')
        else:
            form_template = '%s%s%s'
        if self.prefix and span:
            form_template = '<span class="prefix">%s</span>' + form_template
        else:
            form_template = '%s' + form_template
        if self.suffix and span:
            form_template += '<span class="suffix">%s</span>'
        else:
            form_template += '%s'
        if depr and depr in self.get_marked_attribute_values():
            form_template = (
                '<span class="marked-form" title="%s">%s</span>'
                % (depr.display_value, form_template))
        if cell_qualifier and self.get_qualifier():
            form_template += (
                ' <span class="cell-qualifier">%s</span>'
                % self.get_qualifier())
        forms = [
            (
                (self.get_index(), lip_index, ending.index),
                (form_template % (
                 self.prefix, root, separator, ending.string, self.suffix)),
                combine_qualifiers(
                    lip_qual, filter_quals(ending.qualifiers.all())),
            )
            for ending in endings
        ]
        return forms

    class Meta:
        abstract = True


class TableCell(Cell):
    table_template = ForeignKey(TableTemplate, related_name='table_cells')
    pattern_types = ManyToManyField(PatternType)
    genders = ManyToManyField(Gender)
    attribute_values = ManyToManyField(
        LexemeAttributeValue, related_name='table_cells')
    marked_attribute_values = ManyToManyField(
        LexemeAttributeValue, related_name='marked_cells')
    qualifier = CharField(max_length=128, blank=True)
    row = IntegerField()
    col = IntegerField()
    rowspan = IntegerField()
    colspan = IntegerField()
    index = IntegerField()

    def get_index(self):
        return self.index

    def get_qualifier(self):
        return self.qualifier

    def get_marked_attribute_values(self):
        return set(self.marked_attribute_values.all())

    def __unicode__(self):
        return '%s:%s %s-%s-%s (%s, %s)' % (
            self.table_template.variant_id, self.table_template.name,
            self.prefix, self.base_form_label.symbol, self.suffix,
            self.row, self.col)


class ExportCell(Cell):
    table_template = ForeignKey(TableTemplate, related_name='export_cells')
    pattern_types = ManyToManyField(PatternType)
    genders = ManyToManyField(Gender)
    attribute_values = ManyToManyField(LexemeAttributeValue)
    tag_template = TextField()

    def __unicode__(self):
        return '%s:%s %s-%s-%s (%s)' % (
            self.table_template.variant.id, self.table_template.name,
            self.prefix, self.base_form_label.symbol, self.suffix,
            self.tag_template)


class TableHeader(Model):
    table_template = ForeignKey(TableTemplate, related_name='headers')
    pattern_types = ManyToManyField(PatternType)
    genders = ManyToManyField(Gender)
    attribute_values = ManyToManyField(LexemeAttributeValue)
    row = IntegerField()
    col = IntegerField()
    rowspan = IntegerField()
    colspan = IntegerField()
    label = CharField(max_length=64, blank=True, db_column='nagl')
    css_class = CharField(max_length=8, db_column='styl')

    def __unicode__(self):
        return u'%s:%s %s (%s, %s)' % (
            self.table_template.variant_id, self.table_template.name,
            self.label, self.row, self.col)


# na szybko i brudno
class ParadygmatyWSJP(Model):
    wariant = CharField(max_length=4)
    pos = ForeignKey(PartOfSpeech, db_column='pos')
    typr = ForeignKey(PatternType, db_column='typr')
    charfl = CharField(max_length=16, blank=True, db_column='charfl')
    podparad = CharField(max_length=4, blank=True)
    row = IntegerField()
    col = IntegerField()
    rowspan = IntegerField()
    colspan = IntegerField()
    efobaz = ForeignKey(BaseFormLabel, db_column='efobaz')
    morf = TextField()
    pref = CharField(max_length=20, blank=True)
    suf = CharField(max_length=20, blank=True)
    kskl = IntegerField()

    class Meta:
        db_table = 'paradygmatywsjp'


class HomonymNumber(Model):
    MORFEUSZ_LETTERS = {
        'v': ['v', 'pred'],
        's': ['subst', 'osc', 'skrs'],
        'a': ['adj'],
        'd': ['adv', 'advndm'],
        'n': ['num'],
        'b': ['fraz'],
        'q': ['part'],
        'i': ['interj'],
        'o': ['ppron'],
        'p': ['prep'],
        'c': ['comp'],
        'j': ['conj'],
    }

    MORFEUSZ_LETTERS_REVERSE = dict(
        (pos, letter)
        for (letter, poses) in MORFEUSZ_LETTERS.iteritems()
        for pos in poses)

    lexeme = ForeignKey(Lexeme)
    variant = ForeignKey(Variant)
    number = IntegerField()

    objects = LexemeNotDeletedManager()
    all_objects = Manager()

    class Meta:
        unique_together = ['lexeme', 'variant']


class LexemeForm(Model):
    lexeme = ForeignKey(Lexeme)
    form = CharField(max_length=128, db_index=True)

    objects = LexemeNotDeletedManager()
    all_objects = Manager()


class LexemeFormQualifier(Model):
    lexeme = ForeignKey(Lexeme)
    qualifier = ForeignKey(Qualifier)

    objects = LexemeNotDeletedManager()
    all_objects = Manager()


class SavedFilter(Model):
    serialized_filter = TextField()
    name = CharField(max_length=64)
    user = ForeignKey(User)
    type = CharField(max_length=16)

    class Meta:
        unique_together = ('name', 'user')


class LexemeList(Model):
    filter = TextField()
    a_fronte = BooleanField(default=True)
    vocabularies = TextField()
    last_used = DateTimeField(auto_now_add=True)

    def remove_lexeme(self, lexeme):
        try:
            lexeme_index = self.lexemeindex_set.get(lexeme=lexeme)
            index = lexeme_index.index
            lexeme_index.delete()
            tail = self.lexemeindex_set.filter(index__gt=index)
            tail.update(index=F('index') - 1)
        except LexemeIndex.DoesNotExist:
            pass

    class Meta:
        unique_together = ('filter', 'a_fronte', 'vocabularies')


class LexemeIndex(Model):
    lexeme_list = ForeignKey(LexemeList)
    lexeme = ForeignKey(Lexeme)
    index = IntegerField(db_index=True)
    entry = CharField(max_length=64, db_index=True)

    class Meta:
        unique_together = ('lexeme_list', 'lexeme')
        ordering = ['index']


class SavedExportData(Model):
    serialized_data = TextField()
    name = CharField(max_length=64, unique=True)

    def get_data(self):
        data = json.loads(self.serialized_data)
        temp_dict = {pair['name']: pair['value'] for pair in data}
        data_dict = {
            'variant': temp_dict['variant'],
            'refl': bool(temp_dict.get('refl', False)),
            'commonness': bool(temp_dict.get('commonness', False)),
            'form_qualifiers': True,
            'homonym_numbers': True,
            'copyright': temp_dict['copyright'],
        }
        magic_ids = set()
        magic_qualifiers = []
        normal_qualifiers = []
        vocabs = []
        antivocabs = []
        for pair in data:
            key = pair['name']
            value = pair['value']
            split_key = key.split('-')
            if key == 'vocabs':
                vocabs.append(value)
            elif key == 'antivocabs':
                antivocabs.append(value)
            elif key.startswith('magic') and split_key[0] not in magic_ids:
                i, name = split_key
                magic_ids.add(i)

                qualifier_id = int(temp_dict['%s-qualifier' % i])
                regex = temp_dict['%s-regex' % i]
                if regex:
                    magic_qualifiers.append((regex, qualifier_id))
                else:
                    normal_qualifiers.append(qualifier_id)
        data_dict.update({
            'vocabs': vocabs,
            'antivocabs': antivocabs,
            'magic_qualifiers': magic_qualifiers,
            'excluding_qualifiers': normal_qualifiers,
        })
        return data_dict


# model przeznaczony tylko do odczytu!
# history
class History(Model):
    table_name = CharField(max_length=120, db_column='table_name_')
    column_name = CharField(
        max_length=120, db_column='column_name_', blank=True)
    timestamp = DateTimeField(db_column='timestamp_')
    user = ForeignKey(User, db_column='user_id_', db_index=True)
    old_value = TextField(db_column='old_value_', blank=True)
    new_value = TextField(db_column='new_value_', blank=True)
    lexeme = ForeignKey(
        Lexeme, db_column='lexeme_id_', null=True, blank=True, db_index=True)
    pattern = ForeignKey(
        Pattern, db_column='pattern_id_', null=True, blank=True,db_index=True)
    row_id = IntegerField(db_column='id_')
    operation = CharField(max_length=120, db_column='operation_')
    table_oid = IntegerField(db_column='table_oid_')
    column_ord = IntegerField(db_column='ordinal_position_of_column_')
    transaction_began = DateTimeField(
        db_column='transaction_began_', db_index=True)

    def __unicode__(self):
        return '%s %s.%s %s -> %s' % (
            self.operation, self.table_name, self.column_name,
            repr(self.old_value),
            repr(self.new_value))

    class Meta:
        db_table = 'history'


class InputLexeme(Model):
    entry = CharField(max_length=64, db_index=True)


class InputForm(Model):
    input_lexeme = ForeignKey(InputLexeme)
    form = CharField(max_length=64, db_index=True)
    # tag = TextField()