from django.db import migrations, models
from django.utils import timezone


class CreateAuditModel(migrations.CreateModel):
    """0008 can create this audit table before repairing legacy data.

    Existing installations that already applied 0008 create it here instead.
    Keep audit history on rollback; it is evidence of irreversible data repairs.
    """
    def database_forwards(self, app_label, schema_editor, from_state, to_state):
        model = to_state.apps.get_model(app_label, self.name)
        if model._meta.db_table not in schema_editor.connection.introspection.table_names():
            super().database_forwards(app_label, schema_editor, from_state, to_state)

    def database_backwards(self, app_label, schema_editor, from_state, to_state):
        pass


class Migration(migrations.Migration):
    dependencies = [('customer', '0008_customer_mobile_unique')]
    operations = [CreateAuditModel(
        name='MobileConflict',
        fields=[
            ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
            ('source_model', models.CharField(max_length=100)),
            ('record_id', models.PositiveBigIntegerField()),
            ('workspace_id', models.PositiveBigIntegerField(null=True, blank=True)),
            ('original_mobile', models.PositiveBigIntegerField(null=True, blank=True)),
            ('canonical_mobile', models.PositiveBigIntegerField()),
            ('snapshot', models.JSONField()),
            ('created_at', models.DateTimeField(default=timezone.now, editable=False)),
        ],
        options={'ordering': ['-created_at', '-pk'],
                 'unique_together': (('source_model', 'record_id'),),
                 'verbose_name': 'تعارض شماره قدیمی', 'verbose_name_plural': 'تعارض‌های شماره قدیمی'},
    )]