"""add_session_id_to_resume

Revision ID: 4e19b8fe4a88
Revises: ae966b3e742e
Create Date: 2025-08-30 20:38:36.867781

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '4e19b8fe4a88'
down_revision: Union[str, Sequence[str], None] = 'ae966b3e742e'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Upgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    # Сначала добавляем колонку как nullable
    op.add_column('resume', sa.Column('session_id', sa.Integer(), nullable=True))
    
    # Создаем временную сессию для существующих резюме (если есть)
    op.execute("""
        INSERT INTO session (session_id, is_active, expires_at, last_activity, created_at, updated_at)
        SELECT 
            'legacy-' || CAST(EXTRACT(epoch FROM NOW()) AS TEXT),
            true,
            NOW() + INTERVAL '30 days',
            NOW(),
            NOW(),
            NOW()
        WHERE NOT EXISTS (SELECT 1 FROM session LIMIT 1)
    """)
    
    # Обновляем существующие резюме, привязывая их к первой сессии
    op.execute("""
        UPDATE resume 
        SET session_id = (SELECT id FROM session ORDER BY id LIMIT 1)
        WHERE session_id IS NULL
    """)
    
    # Теперь делаем колонку NOT NULL
    op.alter_column('resume', 'session_id', nullable=False)
    
    op.create_foreign_key(None, 'resume', 'session', ['session_id'], ['id'])
    # ### end Alembic commands ###


def downgrade() -> None:
    """Downgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    op.drop_constraint(None, 'resume', type_='foreignkey')
    op.drop_column('resume', 'session_id')
    # ### end Alembic commands ###