"""migrate func key parking

Revision ID: 5a02fde67132
Revises: 33e0cdb6971d

"""
from __future__ import print_function

# revision identifiers, used by Alembic.
revision = '5a02fde67132'
down_revision = '33e0cdb6971d'

from alembic import op
import sqlalchemy as sa
from sqlalchemy import sql


TYPE_FORWARD = 'forward'

DESTINATION_FEATURES_ID = 8

PARKING_TYPE = 'parkext'


phonefunckey_table = sql.table('phonefunckey',
                               sql.column('iduserfeatures'),
                               sql.column('fknum'),
                               sql.column('exten'),
                               sql.column('typeextenumbers'),
                               sql.column('typevalextenumbers'),
                               sql.column('typeextenumbersright'),
                               sql.column('typevalextenumbersright'),
                               sql.column('label'),
                               sql.column('supervision'),
                               sql.column('progfunckey'))

func_key_table = sql.table('func_key',
                           sql.column('id'),
                           sql.column('type_id'),
                           sql.column('destination_type_id'))

dest_features_table = sql.table('func_key_dest_features',
                                sql.column('func_key_id'),
                                sql.column('destination_type_id'),
                                sql.column('features_id'))

func_key_type_table = sql.table('func_key_type',
                                sql.column('id'),
                                sql.column('name'))

func_key_mapping_table = sql.table('func_key_mapping',
                                   sql.column('template_id'),
                                   sql.column('func_key_id'),
                                   sql.column('destination_type_id'),
                                   sql.column('label'),
                                   sql.column('position'),
                                   sql.column('blf'))

template_table = sql.table('func_key_template', sql.column('id'))

user_table = sql.table('userfeatures',
                       sql.column('id'),
                       sql.column('func_key_private_template_id'))

destination_type_table = sql.table('func_key_destination_type',
                                   sql.column('id'),
                                   sql.column('name'))

features_table = sql.table('features',
                           sql.column('id'),
                           sql.column('category'),
                           sql.column('var_name'))


func_key_columns = (
    phonefunckey_table.c.iduserfeatures.label('user_id'),
    phonefunckey_table.c.fknum.label('position'),
    phonefunckey_table.c.label,
    phonefunckey_table.c.exten.label('park_position'),
    sql.cast(phonefunckey_table.c.supervision, sa.Boolean).label('blf'),
)

old_func_key_columns = (
    func_key_mapping_table.c.func_key_id,
    func_key_mapping_table.c.template_id,
    func_key_mapping_table.c.position,
    func_key_mapping_table.c.blf,
    func_key_mapping_table.c.label,
    user_table.c.id.label('user_id')
)

func_keys_query = (sql.select(func_key_columns)
                   .where(phonefunckey_table.c.typevalextenumbers == PARKING_TYPE))


old_func_keys_query = (sql.select(old_func_key_columns,
                                  from_obj=[
                                      func_key_mapping_table.join(
                                          dest_features_table,
                                          func_key_mapping_table.c.func_key_id == dest_features_table.c.func_key_id)
                                      .join(template_table,
                                            func_key_mapping_table.c.template_id == template_table.c.id)
                                      .join(user_table,
                                            template_table.c.id == user_table.c.func_key_private_template_id)
                                  ]))


def upgrade():
    delete_duplicate_fks()
    migrate_func_keys()
    delete_old_func_keys()


def delete_duplicate_fks():
    for row in get_duplicate_func_keys():
        delete_duplicate_fk(row.iduserfeatures, row.fknum)


def get_duplicate_func_keys():
    columns = (phonefunckey_table.c.iduserfeatures,
               sa.func.min(phonefunckey_table.c.fknum).label("first_position"))

    valid_fk_subq = (sql.select(columns)
                     .where(
                         phonefunckey_table.c.typevalextenumbers == PARKING_TYPE)
                     .group_by(
                         phonefunckey_table.c.iduserfeatures)
                     .having(
                         sa.func.count(phonefunckey_table.c.typevalextenumbers) > 1)
                     .alias())

    columns = (phonefunckey_table.c.iduserfeatures,
               phonefunckey_table.c.fknum)

    join_condition = sql.and_(
        phonefunckey_table.c.typevalextenumbers == PARKING_TYPE,
        phonefunckey_table.c.fknum > valid_fk_subq.c.first_position,
        phonefunckey_table.c.iduserfeatures == valid_fk_subq.c.iduserfeatures)

    duplicate_fk_query = (sql.select(columns,
                                     from_obj=[
                                         phonefunckey_table.join(
                                             valid_fk_subq,
                                             join_condition
                                         )
                                     ]))

    return op.get_bind().execute(duplicate_fk_query)


def delete_duplicate_fk(iduserfeatures, fknum):
    print('[MIGRATE_FK] : Deleting parking func key for user "%s" (fk position %s)' %
          (iduserfeatures, fknum))

    query = (phonefunckey_table
             .delete()
             .where(sql.and_(
                 phonefunckey_table.c.iduserfeatures == iduserfeatures,
                 phonefunckey_table.c.fknum == fknum)))

    op.get_bind().execute(query)


def migrate_func_keys():
    func_key_id = get_parking_func_key()
    for row in op.get_bind().execute(func_keys_query):
        create_mapping(func_key_id, row)


def get_parking_func_key():
    park_subquery = (
        sql.select(
            [features_table.c.id])
        .where(
            sql.and_(
                features_table.c.category == 'general',
                features_table.c.var_name == PARKING_TYPE))
        .alias())

    query = (
        sql.select(
            [dest_features_table.c.func_key_id])
        .where(
            dest_features_table.c.features_id == park_subquery))

    return op.get_bind().execute(query).scalar()


def get_speeddial_id():
    return op.get_bind().execute(
        sql.select(
            [func_key_type_table.c.id])
        .where(
            func_key_type_table.c.name == TYPE_FORWARD)
    ).scalar()


def create_mapping(func_key_id, func_key_row):
    conn = op.get_bind()

    template_query = (
        sql.select(
            [user_table.c.func_key_private_template_id])
        .where(
            user_table.c.id == func_key_row.user_id))

    template_id = conn.execute(template_query).scalar()

    mapping_query = (func_key_mapping_table
                     .insert()
                     .returning(func_key_mapping_table.c.func_key_id)
                     .values(func_key_id=func_key_id,
                             template_id=template_id,
                             destination_type_id=DESTINATION_FEATURES_ID,
                             label=func_key_row.label,
                             position=func_key_row.position,
                             blf=func_key_row.blf))

    conn.execute(mapping_query)


def delete_old_func_keys():
    delete_query = (phonefunckey_table
                    .delete()
                    .where(phonefunckey_table.c.typevalextenumbers == PARKING_TYPE))

    op.get_bind().execute(delete_query)


def downgrade():
    for row in op.get_bind().execute(old_func_keys_query):
        create_old_func_keys(row)
        delete_mapping(row.func_key_id, row.template_id)
        delete_dest_features(row.func_key_id)
        delete_func_key(row.func_key_id)


def create_old_func_keys(row):
    supervision = 1 if row.blf else 0

    row = {'iduserfeatures': row.user_id,
           'fknum': row.position,
           'typeextenumbers': 'generalfeatures',
           'typevalextenumbers': 'parkext',
           'typeextenumbersright': None,
           'typevalextenumbersright': None,
           'label': row.label,
           'exten': None,
           'supervision': supervision}

    op.bulk_insert(phonefunckey_table, [row])


def delete_mapping(func_key_id, template_id):
    query = (func_key_mapping_table
             .delete()
             .where(sql.and_(
                 func_key_mapping_table.c.func_key_id == func_key_id,
                 func_key_mapping_table.c.template_id == template_id)))

    op.get_bind().execute(query)


def delete_dest_features(func_key_id):
    query = (dest_features_table
             .delete())

    op.get_bind().execute(query)


def delete_func_key(func_key_id):
    query = (func_key_table
             .delete()
             .where(func_key_table.c.destination_type_id == DESTINATION_FEATURES_ID))

    op.get_bind().execute(query)
