"""add_qa_model_support

Revision ID: 8d2d099ceb74
Revises: a5b56fb053ef
Create Date: 2023-07-18 15:25:15.293438

"""
import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql

import models.types


def _is_pg(conn):
    return conn.dialect.name == "postgresql"

# revision identifiers, used by Alembic.
revision = '8d2d099ceb74'
down_revision = '7ce5a52e4eee'
branch_labels = None
depends_on = None


def upgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    conn = op.get_bind()
    
    if _is_pg(conn):
        with op.batch_alter_table('document_segments', schema=None) as batch_op:
            batch_op.add_column(sa.Column('answer', sa.Text(), nullable=True))
            batch_op.add_column(sa.Column('updated_by', postgresql.UUID(), nullable=True))
            batch_op.add_column(sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP(0)'), nullable=False))

        with op.batch_alter_table('documents', schema=None) as batch_op:
            batch_op.add_column(sa.Column('doc_form', sa.String(length=255), server_default=sa.text("'text_model'::character varying"), nullable=False))
    else:
        with op.batch_alter_table('document_segments', schema=None) as batch_op:
            batch_op.add_column(sa.Column('answer', models.types.LongText(), nullable=True))
            batch_op.add_column(sa.Column('updated_by', models.types.StringUUID(), nullable=True))
            batch_op.add_column(sa.Column('updated_at', sa.DateTime(), server_default=sa.func.current_timestamp(), nullable=False))

        with op.batch_alter_table('documents', schema=None) as batch_op:
            batch_op.add_column(sa.Column('doc_form', sa.String(length=255), server_default=sa.text("'text_model'"), nullable=False))

    # ### end Alembic commands ###


def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    with op.batch_alter_table('documents', schema=None) as batch_op:
        batch_op.drop_column('doc_form')

    with op.batch_alter_table('document_segments', schema=None) as batch_op:
        batch_op.drop_column('updated_at')
        batch_op.drop_column('updated_by')
        batch_op.drop_column('answer')

    # ### end Alembic commands ###