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

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


def profiles_to_gestion(apps, schema_editor):
    OldProfile = apps.get_model('cof', 'CofProfile')
    NewProfile = apps.get_model('gestion', 'Profile')

    # New profiles are massively imported from the old profiles.
    # IDs are kept identical to ease the migration of models which were
    # referencing the CofProfile model.

    new_profiles = []

    for old_p in OldProfile.objects.values().iterator():
        new_profiles.append(
            NewProfile(
                id=old_p['id'],
                user_id=old_p['user_id'],
                login_clipper=old_p['login_clipper'],
                phone=old_p['phone'],
                occupation=old_p['occupation'],
                departement=old_p['departement'],
                comments=old_p['comments'],
            )
        )

    NewProfile.objects.bulk_create(new_profiles)

    OldProfile.objects.all().update(profile_id=F('id'))


def cof_status_to_gestion(apps, schema_editor):
    Association = apps.get_model('gestion', 'Association')
    CofProfile = apps.get_model('cof', 'CofProfile')

    cof_assoc = Association.objects.get(name='COF')

    cof_pks = (
        CofProfile.objects
        .select_related('profile')
        .values_list('profile__user_id', flat=True)
    )

    cof_assoc.members_group.user_set.add(
        *cof_pks.filter(is_cof=True)
    )
    cof_assoc.staff_group.user_set.add(
        *cof_pks.filter(is_buro=True)
    )


class Migration(migrations.Migration):
    """
    BDS support changes how users data is organized.
    Data is migrated to the new schema.

    """

    dependencies = [
        ('cof', '0008_py3'),
        ('gestion', '0002_create_cof_bds'),
    ]

    operations = [
        # Temporarly authorize 'profile' as nullable to allow migrating data.
        migrations.AddField(
            model_name='cofprofile',
            name='profile',
            field=models.OneToOneField(
                on_delete=models.CASCADE,
                to='gestion.Profile',
                null=True,
                related_name='cof'
            ),
            preserve_default=False,
        ),
        migrations.RunPython(profiles_to_gestion),
        # Data is migrated, unset nullable on 'profile'.
        migrations.AlterField(
            model_name='cofprofile',
            name='profile',
            field=models.OneToOneField(
                on_delete=models.CASCADE,
                to='gestion.Profile',
                related_name='cof'
            ),
        ),
        # Remove fields no longer used.
        migrations.RemoveField(
            model_name='cofprofile',
            name='user',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='comments',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='departement',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='login_clipper',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='occupation',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='phone',
        ),

        # Keep cof member/staff status.
        migrations.RunPython(cof_status_to_gestion),
        # Remove the last no longer used fields.
        migrations.RemoveField(
            model_name='cofprofile',
            name='is_cof',
        ),
        migrations.RemoveField(
            model_name='cofprofile',
            name='is_buro',
        ),

        # Now we are safe, let's do basic operations.
        migrations.AlterModelOptions(
            name='cofprofile',
            options={
                'permissions': (('member', 'Is a COF member'),
                                ('buro', 'Is part of COF staff')),
                'verbose_name': 'Profil COF',
                'verbose_name_plural': 'Profils COF'},
        ),
        migrations.RenameField(
            model_name='cofprofile',
            old_name='mailing_cof',
            new_name='mailing',
        ),
    ]