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"""Fix description field in ``connection`` to be ``text``

Revision ID: 64a7d6477aae
Revises: f5b5ec089444
Create Date: 2020-11-25 08:56:11.866607

"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision = '64a7d6477aae'
down_revision = '61ec73d9401f'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'


def upgrade():
    """Apply Fix description field in ``connection`` to be ``text``"""
    conn = op.get_bind()
    if conn.dialect.name == "sqlite":
        # in sqlite TEXT and STRING column types are the same
        return
    if conn.dialect.name == "mysql":
        op.alter_column(
            'connection',
            'description',
            existing_type=sa.String(length=5000),
            type_=sa.Text(length=5000),
            existing_nullable=True,
        )
    else:
        # postgres does not allow size modifier for text type
        op.alter_column('connection', 'description', existing_type=sa.String(length=5000), type_=sa.Text())


def downgrade():
    """Unapply Fix description field in ``connection`` to be ``text``"""
    conn = op.get_bind()
    if conn.dialect.name == "sqlite":
        # in sqlite TEXT and STRING column types are the same
        return
    if conn.dialect.name == "mysql":
        op.alter_column(
            'connection',
            'description',
            existing_type=sa.Text(5000),
            type_=sa.String(length=5000),
            existing_nullable=True,
        )
    else:
        # postgres does not allow size modifier for text type
        op.alter_column(
            'connection',
            'description',
            existing_type=sa.Text(),
            type_=sa.String(length=5000),
            existing_nullable=True,
        )
