pricing

services/cataloguePrice.go

@@ -0,0 +1,51 @@
+package services
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// The catalogue quotes a RANGE, as a string: "₹9-11", "₹75-95", sometimes a
+// single "₹22". It is what a shopper would expect to pay across the shops the
+// catalogue was built from, not a price any particular shop has set.
+var cataloguePriceFigure = regexp.MustCompile(`[0-9]+(?:\.[0-9]+)?`)
+
+// SuggestedPriceFrom reads a starting price out of a catalogue price range.
+//
+// ── Why import needs this at all ────────────────────────────────────────────
+//
+// Import deliberately wrote no price: "import is not pricing", the merchant sets
+// it. That is right about who decides and wrong about what a shopper sees in the
+// meantime — the product goes live at ₹0, which is not "unpriced" on a phone, it
+// reads as free. Products uploaded by sheet carry their price and show it; the
+// same product imported from the catalogue showed nothing.
+//
+// ── Which end of the range ──────────────────────────────────────────────────
+//
+// The LOW end. It is a suggestion the merchant will overwrite, and the two ways
+// to be wrong are not equal: too low is a margin the shop notices and corrects,
+// too high is a shopper who quietly decides the shop is expensive. The low end
+// is also the number a catalogue range is usually anchored on.
+//
+// Returns 0 when there is no figure to read — 159 of the 672 catalogue rows
+// measured on 2026-09-03 carry no range at all, and inventing a price for those
+// would be worse than showing none.
+func SuggestedPriceFrom(priceRange string) float64 {
+	found := cataloguePriceFigure.FindAllString(strings.TrimSpace(priceRange), -1)
+	if len(found) == 0 {
+		return 0
+	}
+
+	low := 0.0
+	for _, raw := range found {
+		value, err := strconv.ParseFloat(raw, 64)
+		if err != nil || value <= 0 {
+			continue
+		}
+		if low == 0 || value < low {
+			low = value
+		}
+	}
+	return low
+}