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"""Change tag type enum

Revision ID: a6f364988fc2
Revises: 37fdbb373e8d
Create Date: 2017-01-17 18:47:10.700459

"""

from alembic import op
import sqlalchemy as sa

from rally import exceptions


# revision identifiers, used by Alembic.
revision = "a6f364988fc2"
down_revision = "37fdbb373e8d"
branch_labels = None
depends_on = None


TAG_TYPES = ["task", "subtask"]

tag_helper = sa.Table(
    "tags",
    sa.MetaData(),
    sa.Column("id", sa.Integer(), nullable=False),
    sa.Column(
        "type", sa.Enum(*TAG_TYPES, name="enum_tag_types"), nullable=False
    ),
    sa.Column("new_type", sa.String(36), nullable=False),
)


def upgrade() -> None:
    with op.batch_alter_table("tags") as batch_op:
        batch_op.add_column(sa.Column("new_type", sa.String(36)))

    op.execute(tag_helper.update().values(new_type=tag_helper.c.type))

    op.drop_index("d_type_tag", "tags")

    with op.batch_alter_table("tags") as batch_op:
        batch_op.drop_column("type")
        batch_op.alter_column(
            "new_type",
            new_column_name="type",
            existing_type=sa.String(36),
            nullable=False,
        )

    op.create_index("d_type_tag", "tags", ["uuid", "type", "tag"], unique=True)


def downgrade() -> None:
    raise exceptions.DowngradeNotSupported()
