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"""Update migration for FAB tables to add missing constraints

Revision ID: 909884dea523
Revises: 48925b2719cb
Create Date: 2022-03-21 08:33:01.635688

"""


import sqlalchemy as sa
from alembic import op

from airflow.migrations.utils import get_mssql_table_constraints

# revision identifiers, used by Alembic.
revision = '909884dea523'
down_revision = '48925b2719cb'
branch_labels = None
depends_on = None
airflow_version = '2.3.0'


def upgrade():
    """Apply Update migration for FAB tables to add missing constraints"""
    conn = op.get_bind()
    if conn.dialect.name == 'sqlite':
        op.execute('PRAGMA foreign_keys=OFF')
        with op.batch_alter_table('ab_view_menu', schema=None) as batch_op:
            batch_op.create_unique_constraint(batch_op.f('ab_view_menu_name_uq'), ['name'])
        op.execute('PRAGMA foreign_keys=ON')
    elif conn.dialect.name == 'mysql':
        with op.batch_alter_table('ab_register_user', schema=None) as batch_op:
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=False)
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=False)
        with op.batch_alter_table('ab_user', schema=None) as batch_op:
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=False)
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=False)
    elif conn.dialect.name == 'mssql':
        with op.batch_alter_table('ab_register_user') as batch_op:
            # Drop the unique constraint on username and email
            constraints = get_mssql_table_constraints(conn, 'ab_register_user')
            for k, _ in constraints.get('UNIQUE').items():
                batch_op.drop_constraint(k, type_='unique')
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=False)
            batch_op.create_unique_constraint(None, ['username'])
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=False)
        with op.batch_alter_table('ab_user') as batch_op:
            # Drop the unique constraint on username and email
            constraints = get_mssql_table_constraints(conn, 'ab_user')
            for k, _ in constraints.get('UNIQUE').items():
                batch_op.drop_constraint(k, type_='unique')
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=False)
            batch_op.create_unique_constraint(None, ['username'])
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=False)
            batch_op.create_unique_constraint(None, ['email'])


def downgrade():
    """Unapply Update migration for FAB tables to add missing constraints"""
    conn = op.get_bind()
    if conn.dialect.name == 'sqlite':
        op.execute('PRAGMA foreign_keys=OFF')
        with op.batch_alter_table('ab_view_menu', schema=None) as batch_op:
            batch_op.drop_constraint('ab_view_menu_name_uq', type_='unique')
        op.execute('PRAGMA foreign_keys=ON')
    elif conn.dialect.name == 'mysql':
        with op.batch_alter_table('ab_user', schema=None) as batch_op:
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=True)
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=True, unique=True)
        with op.batch_alter_table('ab_register_user', schema=None) as batch_op:
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=True)
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=True, unique=True)
    elif conn.dialect.name == 'mssql':
        with op.batch_alter_table('ab_register_user') as batch_op:
            # Drop the unique constraint on username and email
            constraints = get_mssql_table_constraints(conn, 'ab_register_user')
            for k, _ in constraints.get('UNIQUE').items():
                batch_op.drop_constraint(k, type_='unique')
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=False, unique=True)
            batch_op.create_unique_constraint(None, ['username'])
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=False, unique=True)
        with op.batch_alter_table('ab_user') as batch_op:
            # Drop the unique constraint on username and email
            constraints = get_mssql_table_constraints(conn, 'ab_user')
            for k, _ in constraints.get('UNIQUE').items():
                batch_op.drop_constraint(k, type_='unique')
            batch_op.alter_column('username', existing_type=sa.String(256), nullable=True)
            batch_op.create_unique_constraint(None, ['username'])
            batch_op.alter_column('email', existing_type=sa.String(256), nullable=True, unique=True)
            batch_op.create_unique_constraint(None, ['email'])
