import re

from odoo import models, fields, api
from odoo.exceptions import ValidationError


class ProductTemplate(models.Model):
    _inherit = 'product.template'

    item_code = fields.Char(
        string='Item Code',
        index=True,
        help='Kombinasi: parent_kode + kategori_kode + id_produk(4digit) + nama_produk_tanpa_spasi(lower)',
    )

    @api.constrains('item_code')
    def _check_item_code_unique(self):
        for rec in self:
            if not rec.item_code:
                continue
            dup = self.search([('item_code', '=', rec.item_code), ('id', '!=', rec.id)], limit=1)
            if dup:
                raise ValidationError(
                    f'Item Code "{rec.item_code}" sudah dipakai oleh produk lain '
                    f'({dup.name}). Item Code harus unik.'
                )

    def _generate_item_code(self):
        """Generate item_code: parent_code + cat_code + id:04d + name_slug"""
        for p in self:
            cat = p.categ_id
            parent_code = ''
            cat_code = '00'

            if cat:
                # Pastikan kategori punya code (calculate jika belum ada)
                if not cat.code:
                    cat.code = f'{cat.id:02d}'
                parent_code = cat.parent_id.code if cat.parent_id else ''
                cat_code = cat.code

            # slug: lowercase, remove semua spasi
            name_slug = re.sub(r'\s+', '', (p.name or '').lower())
            p.item_code = f'{parent_code}{cat_code}{p.id:04d}{name_slug}'

    @api.model_create_multi
    def create(self, vals_list):
        records = super().create(vals_list)
        records._generate_item_code()
        return records

    def write(self, vals):
        res = super().write(vals)
        if 'name' in vals or 'categ_id' in vals:
            self._generate_item_code()
        return res