"""remove adapters, update agents: capabilities + token on agent

Revision ID: a1b2c3d4e5f6
Revises: 864b0ce5d657
Create Date: 2026-02-15 22:30:00.000000
"""
from typing import Sequence, Union

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

revision: str = 'a1b2c3d4e5f6'
down_revision: Union[str, None] = '864b0ce5d657'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Add new columns to agents
    op.add_column('agents', sa.Column('token', sa.String(255), unique=True))
    op.add_column('agents', sa.Column('capabilities', postgresql.ARRAY(sa.String()), server_default='{}', nullable=False))

    # Generate tokens for existing agents
    op.execute("UPDATE agents SET token = 'agent-' || md5(random()::text || clock_timestamp()::text) WHERE token IS NULL")
    op.alter_column('agents', 'token', nullable=False)

    # Drop old columns from agents
    op.drop_constraint('agents_adapter_id_fkey', 'agents', type_='foreignkey')
    op.drop_column('agents', 'adapter_id')
    op.drop_column('agents', 'system_prompt')
    op.drop_column('agents', 'host')
    op.drop_column('agents', 'pid')
    op.drop_column('agents', 'restart_count')

    # Change default subscription_mode
    op.alter_column('agents', 'subscription_mode', server_default='assigned')

    # Drop adapters table
    op.drop_table('adapters')


def downgrade() -> None:
    # Recreate adapters
    op.create_table(
        'adapters',
        sa.Column('id', postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text('gen_random_uuid()')),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('provider', sa.String(50), nullable=False),
        sa.Column('config', postgresql.JSONB, nullable=False, server_default='{}'),
        sa.Column('capabilities', postgresql.ARRAY(sa.String()), nullable=False, server_default='{}'),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()')),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()')),
    )

    # Re-add columns to agents
    op.add_column('agents', sa.Column('adapter_id', postgresql.UUID(as_uuid=True)))
    op.add_column('agents', sa.Column('system_prompt', sa.Text()))
    op.add_column('agents', sa.Column('host', sa.String(255), server_default='localhost'))
    op.add_column('agents', sa.Column('pid', sa.Integer()))
    op.add_column('agents', sa.Column('restart_count', sa.Integer(), server_default='0'))

    op.drop_column('agents', 'token')
    op.drop_column('agents', 'capabilities')