"""Add ACTIVATED status to PPR, PENDING status to departures, arrival_id FK on departures

Revision ID: 007_ppr_activated_status
Revises: 006_movements
Create Date: 2026-04-03 12:00:00.000000

"""
from alembic import op
import sqlalchemy as sa

revision = '007_ppr_activated_status'
down_revision = '006_movements'
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Add ACTIVATED to PPR status enum
    op.execute(
        "ALTER TABLE submitted MODIFY COLUMN status "
        "ENUM('NEW','CONFIRMED','CANCELED','LANDED','DELETED','DEPARTED','ACTIVATED') NOT NULL"
    )

    # Add PENDING to departures status enum
    op.execute(
        "ALTER TABLE departures MODIFY COLUMN status "
        "ENUM('BOOKED_OUT','GROUND','DEPARTED','LOCAL','CANCELLED','PENDING') NOT NULL"
    )

    # Add arrival_id FK column to departures (nullable - only set for PPR-activated departures)
    op.add_column('departures', sa.Column('arrival_id', sa.BigInteger(), nullable=True))
    op.create_foreign_key(
        'fk_departures_arrival_id', 'departures', 'arrivals',
        ['arrival_id'], ['id'], ondelete='SET NULL'
    )
    op.create_index('idx_departures_arrival_id', 'departures', ['arrival_id'])


def downgrade() -> None:
    op.drop_index('idx_departures_arrival_id', table_name='departures')
    op.drop_constraint('fk_departures_arrival_id', 'departures', type_='foreignkey')
    op.drop_column('departures', 'arrival_id')

    op.execute(
        "UPDATE departures SET status = 'CANCELLED' WHERE status = 'PENDING'"
    )
    op.execute(
        "ALTER TABLE departures MODIFY COLUMN status "
        "ENUM('BOOKED_OUT','GROUND','DEPARTED','LOCAL','CANCELLED') NOT NULL"
    )

    op.execute(
        "UPDATE submitted SET status = 'CONFIRMED' WHERE status = 'ACTIVATED'"
    )
    op.execute(
        "ALTER TABLE submitted MODIFY COLUMN status "
        "ENUM('NEW','CONFIRMED','CANCELED','LANDED','DELETED','DEPARTED') NOT NULL"
    )