# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations, models
import django.db.models.deletion

from kfet.config import KFetConfigForm


def adapt_settings(apps, schema_editor):
    Settings = apps.get_model('kfet', 'Settings')
    db_alias = schema_editor.connection.alias
    obj = Settings.objects.using(db_alias)

    cfg = {}

    def try_get(new, old, type_field):
        try:
            value = getattr(obj.get(name=old), type_field)
            cfg[new] = value
        except Settings.DoesNotExist:
            pass

    try:
        subvention = obj.get(name='SUBVENTION_COF').value_decimal
        subvention_mult = 1 + subvention/100
        reduction = (1 - 1/subvention_mult) * 100
        cfg['kfet_reduction_cof'] = reduction
    except Settings.DoesNotExist:
        pass
    try_get('kfet_addcost_amount', 'ADDCOST_AMOUNT', 'value_decimal')
    try_get('kfet_addcost_for', 'ADDCOST_FOR', 'value_account')
    try_get('kfet_overdraft_duration', 'OVERDRAFT_DURATION', 'value_duration')
    try_get('kfet_overdraft_amount', 'OVERDRAFT_AMOUNT', 'value_decimal')
    try_get('kfet_cancel_duration', 'CANCEL_DURATION', 'value_duration')

    cfg_form = KFetConfigForm(initial=cfg)
    if cfg_form.is_valid():
        cfg_form.save()


class Migration(migrations.Migration):

    dependencies = [
        ('kfet', '0053_created_at'),
        ('djconfig', '0001_initial'),
    ]

    operations = [
        migrations.RunPython(adapt_settings),
        migrations.RemoveField(
            model_name='settings',
            name='value_account',
        ),
        migrations.DeleteModel(
            name='Settings',
        ),
    ]