"""Add terminal_sessions table for SSH web terminal feature.

Revision ID: 0013
Revises: 0012_add_docker_unique_constraints
Create Date: 2024-12-17

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '0013'
down_revision: Union[str, None] = '0012'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        'terminal_sessions',
        sa.Column('id', sa.String(64), primary_key=True),
        sa.Column('host_id', sa.String(), nullable=False, index=True),
        sa.Column('host_name', sa.String(), nullable=False),
        sa.Column('host_ip', sa.String(), nullable=False),
        sa.Column('user_id', sa.String(), nullable=True),
        sa.Column('username', sa.String(), nullable=True),
        sa.Column('token_hash', sa.String(128), nullable=False),
        sa.Column('ttyd_port', sa.Integer(), nullable=False),
        sa.Column('ttyd_pid', sa.Integer(), nullable=True),
        sa.Column('mode', sa.String(20), nullable=False, server_default='embedded'),
        sa.Column('status', sa.String(20), nullable=False, server_default='active'),
        sa.Column('created_at', sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
        sa.Column('expires_at', sa.DateTime(timezone=True), nullable=False),
        sa.Column('closed_at', sa.DateTime(timezone=True), nullable=True),
    )
    
    # Index for cleanup queries
    op.create_index('ix_terminal_sessions_status', 'terminal_sessions', ['status'])
    op.create_index('ix_terminal_sessions_expires_at', 'terminal_sessions', ['expires_at'])
    op.create_index('ix_terminal_sessions_user_id', 'terminal_sessions', ['user_id'])


def downgrade() -> None:
    op.drop_index('ix_terminal_sessions_user_id', table_name='terminal_sessions')
    op.drop_index('ix_terminal_sessions_expires_at', table_name='terminal_sessions')
    op.drop_index('ix_terminal_sessions_status', table_name='terminal_sessions')
    op.drop_table('terminal_sessions')