"""Add master product parent/child relation table.

Revision ID: 0031_add_master_product_relation
Revises: 0030_add_dashboard_compat_tables
Create Date: 2026-06-12 12:00:00.000000
"""

from __future__ import annotations

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

revision = "0031_add_master_product_relation"
down_revision = "0030_add_dashboard_compat_tables"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "master_product_relation",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("parent_sku", sa.String(128), nullable=False),
        sa.Column("child_sku", sa.String(128), nullable=False),
        sa.Column("option_mapping", JSONB, nullable=True),
        sa.Column("sort_order", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("source_label", sa.String(128), nullable=True),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.UniqueConstraint(
            "parent_sku",
            "child_sku",
            name="uq_master_product_relation_parent_child",
        ),
    )
    op.create_index("ix_master_product_relation_parent_sku", "master_product_relation", ["parent_sku"])
    op.create_index("ix_master_product_relation_child_sku", "master_product_relation", ["child_sku"])


def downgrade() -> None:
    op.drop_index("ix_master_product_relation_child_sku", table_name="master_product_relation")
    op.drop_index("ix_master_product_relation_parent_sku", table_name="master_product_relation")
    op.drop_table("master_product_relation")