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"""Add kubernetes scheduler uniqueness

Revision ID: 86770d1215c0
Revises: 27c6a30d7c24
Create Date: 2018-04-03 15:31:20.814328

"""
import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision = '86770d1215c0'
down_revision = '27c6a30d7c24'
branch_labels = None
depends_on = None
airflow_version = '1.10.0'

RESOURCE_TABLE = "kube_worker_uuid"


def upgrade():

    columns_and_constraints = [
        sa.Column("one_row_id", sa.Boolean, server_default=sa.true(), primary_key=True),
        sa.Column("worker_uuid", sa.String(255)),
    ]

    conn = op.get_bind()

    # alembic creates an invalid SQL for mssql and mysql dialects
    if conn.dialect.name in {"mysql"}:
        columns_and_constraints.append(sa.CheckConstraint("one_row_id<>0", name="kube_worker_one_row_id"))
    elif conn.dialect.name not in {"mssql"}:
        columns_and_constraints.append(sa.CheckConstraint("one_row_id", name="kube_worker_one_row_id"))

    table = op.create_table(RESOURCE_TABLE, *columns_and_constraints)

    op.bulk_insert(table, [{"worker_uuid": ""}])


def downgrade():
    op.drop_table(RESOURCE_TABLE)
