"""Guard against cross-SKU contamination and fabricated numeric specifications."""
import hashlib
import importlib.util
import json
from pathlib import Path
import unittest

spec = importlib.util.spec_from_file_location('completion', Path(__file__).with_name('recover-product-completion.py'))
m = importlib.util.module_from_spec(spec)
spec.loader.exec_module(m)


class ExactSkuAttributes(unittest.TestCase):
    def page(self, *, selected='123', variants=None, suffix=';', props=None):
        item = {'skuId': selected, 'saleProp': props or {'1': '规格'},
                'skuName': '不要把标题 100g*5 当已核重量',
                'newColorSize': variants if variants is not None else [
                    {'skuId': '999', '1': '其他口味100袋'}, {'skuId': '123', '1': '当前口味五连包'}]}
        return ('window._itemOnly = ' + json.dumps({'item': item}, ensure_ascii=False) + suffix).encode()

    def parse(self, raw):
        return m.select_spec(raw, '123', hashlib.sha256(raw).hexdigest())

    def test_only_selected_variant_and_no_title_weights(self):
        actual = self.parse(self.page())
        self.assertEqual(actual['specText'], '规格：当前口味五连包')
        self.assertEqual(actual['attributes'][0]['valuePointer'], '/item/newColorSize/1/1')
        self.assertNotIn('netWeightG', actual)
        self.assertNotIn('其他', actual['specText'])

    def test_wrong_product_rejected(self):
        with self.assertRaisesRegex(ValueError, 'PAGE_PRODUCT_MISMATCH'):
            self.parse(self.page(selected='999'))

    def test_missing_selected_variant_rejected(self):
        with self.assertRaisesRegex(ValueError, 'SELECTED_SKU_NOT_UNIQUE'):
            self.parse(self.page(variants=[{'skuId': '999', '1': '其他口味'}]))

    def test_duplicate_selected_variant_rejected(self):
        with self.assertRaisesRegex(ValueError, 'SELECTED_SKU_NOT_UNIQUE'):
            self.parse(self.page(variants=[{'skuId': '123', '1': 'a'}, {'skuId': '123', '1': 'b'}]))

    def test_unlabelled_display_color_is_not_attribute(self):
        with self.assertRaisesRegex(ValueError, 'NO_EXPLICIT_SELECTED_ATTRIBUTE'):
            self.parse(self.page(variants=[{'skuId': '123', 'color': 'unproven display text'}]))

    def test_changed_original_rejected(self):
        with self.assertRaisesRegex(ValueError, 'PAGE_HASH_MISMATCH'):
            m.select_spec(self.page() + b'changed', '123', hashlib.sha256(self.page()).hexdigest())

    def test_javascript_expression_never_executed_or_accepted(self):
        with self.assertRaisesRegex(ValueError, 'NON_LITERAL_ASSIGNMENT'):
            self.parse(self.page(suffix='+ maliciousCall();'))


if __name__ == '__main__':
    unittest.main()