# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1
"""Migrate the cert's single Customer Contact (Many2one) to a Many2many.

fp.certificate.contact_partner_id (single Many2one column) was renamed to
contact_partner_ids (Many2many -> res.partner, rel
fp_certificate_contact_partner_rel) so a cert can carry every contact who
receives the CoC. Odoo creates the new rel table during the schema-update
phase but leaves the old column orphaned. Copy each cert's single contact
into the new M2m (becomes the primary / printed addressee), then drop the
dead column. Guarded + idempotent.
"""
import logging

_logger = logging.getLogger(__name__)


def migrate(cr, version):
    cr.execute("""
        SELECT 1 FROM information_schema.columns
         WHERE table_name = 'fp_certificate'
           AND column_name = 'contact_partner_id'
    """)
    if not cr.fetchone():
        return
    cr.execute("""
        SELECT 1 FROM information_schema.tables
         WHERE table_name = 'fp_certificate_contact_partner_rel'
    """)
    if not cr.fetchone():
        _logger.warning(
            'fp_certificate_contact_partner_rel missing — skipping cert '
            'customer-contact migration (rel table not created yet).')
        return
    cr.execute("""
        INSERT INTO fp_certificate_contact_partner_rel (cert_id, partner_id)
        SELECT c.id, c.contact_partner_id
          FROM fp_certificate c
         WHERE c.contact_partner_id IS NOT NULL
           AND NOT EXISTS (
               SELECT 1 FROM fp_certificate_contact_partner_rel r
                WHERE r.cert_id = c.id
                  AND r.partner_id = c.contact_partner_id)
    """)
    moved = cr.rowcount
    cr.execute(
        "ALTER TABLE fp_certificate DROP COLUMN IF EXISTS contact_partner_id")
    _logger.info(
        'Cert customer-contact migration: copied %s single contact_partner_id '
        'value(s) into the new contact_partner_ids M2m, dropped old column.',
        moved)