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

from django.db import migrations
from django.db.models import Q


def update_permissions(apps, schema_editor):
    Permission = apps.get_model('auth', 'Permission')
    ContentType = apps.get_model('contenttypes', 'ContentType')
    Account = apps.get_model('kfet', 'Account')

    # If `kfet.is_team` permission exists, rename it.

    Permission.objects.filter(
        content_type__app_label='kfet',
        content_type__model='account',
        codename='is_team',
    ).update(name="Membre de l'équipe")

    # If `kfet.view_negs` permission exists, move it as
    # `kfet.view_accountnegative`.

    try:
        view_negs_p = Permission.objects.get(
            content_type__app_label='kfet',
            content_type__model='accountnegative',
            codename='view_negs',
        )
    except Permission.DoesNotExist:
        pass
    else:
        # Avoid failure due to unicity constraint if migrations were partially
        # applied.
        # Because `view_negs` still exists here, it should be safe to consider
        # that nothing uses `view_accountnegative` so that it can be deleted.
        Permission.objects.filter(
            content_type__app_label='kfet',
            content_type__model='accountnegative',
            codename='view_accountnegative',
        ).delete()

        view_negs_p.codename = 'view_accountnegative'
        view_negs_p.name = 'Can view Compte en négatif'
        view_negs_p.save()

    # Delete unused permissions.

    to_delete = {
        'account': ['delete_account'],
        'accountnegative': [
            'add_accountnegative', 'delete_accountnegative', 'view_negs'],
        'article': ['delete_article'],
        'articlecategory': ['add_articlecategory', 'delete_articlecategory'],
        'articlerule': '__all__',
        'checkout': ['delete_checkout'],
        'checkoutstatement': ['delete_checkoutstatement'],
        'checkouttransfer': '__all__',
        'inventory': ['change_inventory', 'delete_inventory'],
        'inventoryarticle': '__all__',
        'operation': ['add_operation', 'change_operation', 'delete_operation'],
        'operationgroup': '__all__',
        'order': ['change_order', 'delete_order'],
        'orderarticle': '__all__',
        'supplier': ['add_supplier', 'delete_supplier'],
        'supplierarticle': '__all__',
        'transfer': ['change_transfer', 'delete_transfer'],
        'transfergroup': '__all__',
    }

    to_delete_q = Q()

    for model_name, codenames in to_delete.items():
        if codenames == '__all__':
            to_delete_q |= Q(content_type__model=model_name)
        else:
            to_delete_q |= Q(
                content_type__model=model_name,
                codename__in=codenames,
            )

    to_delete_q &= Q(content_type__app_label='kfet')

    Permission.objects.filter(to_delete_q).delete()


class Migration(migrations.Migration):
    """
    Data migration which performs permissions cleaning.
    """
    dependencies = [
        ('kfet', '0062_change_models_opts'),
        ('auth', '0006_require_contenttypes_0002'),
        ('contenttypes', '0002_remove_content_type_name'),
    ]

    operations = [
        migrations.RunPython(update_permissions),
    ]