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"""Add case-insensitive unique constraint for username

Revision ID: e07f49787c9d
Revises: b0d31815b5a6
Create Date: 2022-10-25 17:29:46.432326

"""

from __future__ import annotations

import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision = 'e07f49787c9d'
down_revision = 'b0d31815b5a6'
branch_labels = None
depends_on = None
airflow_version = '2.4.3'


def upgrade():
    """Apply Add case-insensitive unique constraint"""
    conn = op.get_bind()
    if conn.dialect.name == 'postgresql':
        op.create_index('idx_ab_user_username', 'ab_user', [sa.text('LOWER(username)')], unique=True)
        op.create_index(
            "idx_ab_register_user_username", 'ab_register_user', [sa.text('LOWER(username)')], unique=True
        )
    elif conn.dialect.name == 'sqlite':
        with op.batch_alter_table('ab_user') as batch_op:
            batch_op.alter_column(
                'username',
                existing_type=sa.String(64),
                _type=sa.String(64, collation='NOCASE'),
                unique=True,
                nullable=False,
            )
        with op.batch_alter_table('ab_register_user') as batch_op:
            batch_op.alter_column(
                'username',
                existing_type=sa.String(64),
                _type=sa.String(64, collation='NOCASE'),
                unique=True,
                nullable=False,
            )


def downgrade():
    """Unapply Add case-insensitive unique constraint"""
    conn = op.get_bind()
    if conn.dialect.name == 'postgresql':
        op.drop_index('idx_ab_user_username', table_name='ab_user')
        op.drop_index('idx_ab_register_user_username', table_name='ab_register_user')
    elif conn.dialect.name == 'sqlite':
        with op.batch_alter_table('ab_user') as batch_op:
            batch_op.alter_column(
                'username',
                existing_type=sa.String(64, collation='NOCASE'),
                _type=sa.String(64),
                unique=True,
                nullable=False,
            )
        with op.batch_alter_table('ab_register_user') as batch_op:
            batch_op.alter_column(
                'username',
                existing_type=sa.String(64, collation='NOCASE'),
                _type=sa.String(64),
                unique=True,
                nullable=False,
            )
