feat(Price tags): script to match historical PriceTag with their pric…

…es (#650)

open_prices/proofs/management/commands/match_price_tags_with_existing_prices.py

@@ -0,0 +1,88 @@
+from collections import Counter
+
+from django.core.management.base import BaseCommand
+
+from open_prices.prices.constants import TYPE_CATEGORY, TYPE_PRODUCT
+from open_prices.prices.models import Price
+from open_prices.proofs.models import PriceTag, Proof
+
+
+def stats():
+    print("PriceTag:", PriceTag.objects.count())
+    print("Proof PRICE_TAG:", Proof.objects.has_type_price_tag().count())
+    print(
+        "PriceTag per status:",
+        Counter(PriceTag.objects.all().values_list("status", flat=True)),
+    )
+    print(
+        "PriceTag without a price_id:",
+        PriceTag.objects.filter(price_id__isnull=True).count(),
+    )
+
+
+def match_price_tag_with_product_price(price: Price, price_tag: PriceTag) -> bool:
+    return (
+        price.type == TYPE_PRODUCT
+        and (price.product_code == price_tag.predictions.first().data["barcode"])
+        and (str(price.price) == str(price_tag.predictions.first().data["price"]))
+    )
+
+
+def match_price_tag_with_category_price(price: Price, price_tag: PriceTag) -> bool:
+    return (
+        price.type == TYPE_CATEGORY
+        and (price.product_code == price_tag.predictions.first().data["product"])
+        and (str(price.price) == str(price_tag.predictions.first().data["price"]))
+    )
+
+
+class Command(BaseCommand):
+    """
+    for each proof
+    try to match generated price_tags with existing prices
+    - skip proofs without price_tags or without prices
+    - skip price_tags that already have a price_id or that have no predictions
+    - finally loop on each price and try to match with the price_tag prediction data  # noqa
+    """
+
+    help = "Match price tags with existing prices."
+
+    def handle(self, *args, **options) -> None:  # type: ignore
+        self.stdout.write("Stats before...")
+        stats()
+
+        self.stdout.write("Running matching script...")
+        for proof in Proof.objects.has_type_price_tag().prefetch_related(
+            "prices", "price_tags", "price_tags__predictions"
+        ):
+            if proof.price_tags.count() == 0:
+                continue
+            elif proof.prices.count() == 0:
+                continue
+            else:
+                for price_tag in proof.price_tags.all():
+                    if price_tag.price_id is not None:
+                        continue
+                    elif price_tag.predictions.count() == 0:
+                        continue
+                    else:
+                        for price in proof.prices.all():
+                            if price.price_tags.count() > 0:
+                                continue
+                            # match product price
+                            elif match_price_tag_with_product_price(price, price_tag):
+                                price_tag.price_id = price.id
+                                price_tag.status = 1
+                                price_tag.save()
+                                break
+                            # match category price
+                            elif match_price_tag_with_category_price(price, price_tag):
+                                price_tag.price_id = price.id
+                                price_tag.status = 1
+                                price_tag.save()
+                                break
+                            else:
+                                continue
+
+        self.stdout.write("Stats after...")
+        stats()