# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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"""change_owner_to_m2m_relation_on_datasources.py

Revision ID: 3e1b21cd94a4
Revises: 4ce8df208545
Create Date: 2018-12-15 12:34:47.228756

"""

# revision identifiers, used by Alembic.
from superset import db
from superset.utils.core import generic_find_fk_constraint_name

revision = '3e1b21cd94a4'
down_revision = '6c7537a6004a'

from alembic import op
import sqlalchemy as sa


sqlatable_user = sa.Table(
    'sqlatable_user', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('user_id', sa.Integer, sa.ForeignKey('ab_user.id')),
    sa.Column('table_id', sa.Integer, sa.ForeignKey('tables.id')),
)

SqlaTable = sa.Table(
    'tables', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('user_id', sa.Integer, sa.ForeignKey('ab_user.id')),
)

druiddatasource_user = sa.Table(
    'druiddatasource_user', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('user_id', sa.Integer, sa.ForeignKey('ab_user.id')),
    sa.Column('datasource_id', sa.Integer, sa.ForeignKey('datasources.id')),
)

DruidDatasource = sa.Table(
    'datasources', sa.MetaData(),
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('user_id', sa.Integer, sa.ForeignKey('ab_user.id')),
)


def upgrade():
    op.create_table('sqlatable_user',
                    sa.Column('id', sa.Integer(), nullable=False),
                    sa.Column('user_id', sa.Integer(), nullable=True),
                    sa.Column('table_id', sa.Integer(), nullable=True),
                    sa.ForeignKeyConstraint(['table_id'], ['tables.id'], ),
                    sa.ForeignKeyConstraint(['user_id'], ['ab_user.id'], ),
                    sa.PrimaryKeyConstraint('id')
                    )
    op.create_table('druiddatasource_user',
                    sa.Column('id', sa.Integer(), nullable=False),
                    sa.Column('user_id', sa.Integer(), nullable=True),
                    sa.Column('datasource_id', sa.Integer(), nullable=True),
                    sa.ForeignKeyConstraint(['datasource_id'], ['datasources.id'], ),
                    sa.ForeignKeyConstraint(['user_id'], ['ab_user.id'], ),
                    sa.PrimaryKeyConstraint('id')
                    )

    bind = op.get_bind()
    insp = sa.engine.reflection.Inspector.from_engine(bind)
    session = db.Session(bind=bind)

    tables = session.query(SqlaTable).all()
    for table in tables:
        if table.user_id is not None:
            session.execute(
                sqlatable_user.insert().values(user_id=table.user_id, table_id=table.id)
            )

    druiddatasources = session.query(DruidDatasource).all()
    for druiddatasource in druiddatasources:
        if druiddatasource.user_id is not None:
            session.execute(
                druiddatasource_user.insert().values(user_id=druiddatasource.user_id, datasource_id=druiddatasource.id)
            )

    session.close()
    with op.batch_alter_table('tables') as batch_op:
        batch_op.drop_constraint('user_id', type_='foreignkey')
        batch_op.drop_column('user_id')
    with op.batch_alter_table('datasources') as batch_op:
        batch_op.drop_constraint(generic_find_fk_constraint_name(
            'datasources',
            {'id'},
            'ab_user',
            insp,
        ), type_='foreignkey')
        batch_op.drop_column('user_id')


def downgrade():
    op.drop_table('sqlatable_user')
    op.drop_table('druiddatasource_user')
    with op.batch_alter_table('tables') as batch_op:
        batch_op.add_column(sa.Column('user_id', sa.INTEGER(), nullable=True))
        batch_op.create_foreign_key('user_id', 'ab_user', ['user_id'], ['id'])
    with op.batch_alter_table('datasources') as batch_op:
        batch_op.add_column(sa.Column('user_id', sa.INTEGER(), nullable=True))
        batch_op.create_foreign_key('fk_datasources_user_id_ab_user', 'ab_user', ['user_id'], ['id'])
