"""Add SeriesPage table for ordered series/comic reading

Revision ID: e26012202
Revises: d26012201
Create Date: 2026-01-22

"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = 'e26012202'
down_revision = 'd26012201'
branch_labels = None
depends_on = None


def upgrade():
    # Create series_page table
    op.create_table(
        'series_page',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('series_tag_id', sa.Integer(), nullable=False),
        sa.Column('image_id', sa.Integer(), nullable=False),
        sa.Column('page_number', sa.Integer(), nullable=False),
        sa.Column('created_at', sa.DateTime(), nullable=True),
        sa.Column('updated_at', sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(['series_tag_id'], ['tag.id'], ondelete='CASCADE'),
        sa.ForeignKeyConstraint(['image_id'], ['image_record.id'], ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('image_id'),  # Image can only be in one series
        sa.UniqueConstraint('series_tag_id', 'page_number', name='uq_series_page_number')
    )
    op.create_index('ix_series_page_series_tag', 'series_page', ['series_tag_id'], unique=False)


def downgrade():
    op.drop_index('ix_series_page_series_tag', table_name='series_page')
    op.drop_table('series_page')