# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1
# Sub 9 — Process Variants per Part. Runs on upgrade to 19.0.15.0.0.
#
# For every part that had a default_process_id, mark its root node as
# the default variant and seed a friendly label. Idempotent (NULL guards).

import logging

_logger = logging.getLogger(__name__)


def migrate(cr, version):
    if not version:
        return  # Fresh install — nothing to migrate

    _logger.info("Sub 9: backfilling process variant flags")

    # Step 1: Mark each part's existing default_process_id root as the
    # default variant. The flag is cleared on every other root so we
    # land in a consistent "exactly one default" state.
    cr.execute("""
        UPDATE fusion_plating_process_node
        SET    is_default_variant = FALSE
        WHERE  parent_id IS NULL
          AND  node_type = 'recipe'
          AND  part_catalog_id IS NOT NULL
    """)
    _logger.info("Sub 9: cleared is_default_variant on %d roots", cr.rowcount)

    cr.execute("""
        UPDATE fusion_plating_process_node node
        SET    is_default_variant = TRUE
        FROM   fp_part_catalog part
        WHERE  part.default_process_id = node.id
          AND  node.parent_id IS NULL
          AND  node.node_type = 'recipe'
          AND  node.part_catalog_id = part.id
    """)
    _logger.info(
        "Sub 9: flagged is_default_variant on %d roots (one per part with default_process_id)",
        cr.rowcount,
    )

    # Step 2: Seed variant_label='Default' on the now-flagged variants
    # so the picker shows something readable. Only fills NULL/empty.
    cr.execute("""
        UPDATE fusion_plating_process_node
        SET    variant_label = 'Default'
        WHERE  is_default_variant = TRUE
          AND  (variant_label IS NULL OR variant_label = '')
    """)
    _logger.info("Sub 9: seeded variant_label='Default' on %d records", cr.rowcount)

    _logger.info("Sub 9: migration complete")