bulk request and approve

controllers/stockRequestBatch.go

@@ -0,0 +1,68 @@
+package controllers
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"nearle/models"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// parseStockRequests reads either one request or a list of them.
+//
+// Sniffing the first byte rather than trying one shape and falling back to the
+// other: BodyParser consumes what it reads, so a failed first attempt can leave
+// nothing for the second. The body is JSON here and `[` is unambiguous.
+func parseStockRequests(c *fiber.Ctx) ([]models.StockRequest, error) {
+	body := c.Body()
+
+	for _, b := range body {
+		switch b {
+		case ' ', '\t', '\r', '\n':
+			continue
+		case '[':
+			var many []models.StockRequest
+			if err := json.Unmarshal(body, &many); err != nil {
+				return nil, err
+			}
+			return many, nil
+		}
+		break
+	}
+
+	var one models.StockRequest
+	if err := c.BodyParser(&one); err != nil {
+		return nil, err
+	}
+	return []models.StockRequest{one}, nil
+}
+
+// dedupeIDs drops repeats and anything non-positive, preserving order.
+//
+// Repeats matter here rather than being tidiness: approving adds stock, so the
+// same id twice in one batch would try to receive the same delivery twice. The
+// service has its own guard, but a batch should not be relying on it.
+func dedupeIDs(ids []int) []int {
+	seen := make(map[int]bool, len(ids))
+	out := make([]int, 0, len(ids))
+	for _, id := range ids {
+		if id <= 0 || seen[id] {
+			continue
+		}
+		seen[id] = true
+		out = append(out, id)
+	}
+	return out
+}
+
+// stockBatchMessage says what happened in words a merchant can act on.
+//
+// "8 approved, 2 could not be" beats "Success" when two of ten did not land —
+// the whole point of reporting per row is that the person can go and look.
+func stockBatchMessage(ok, failed int, verb string) string {
+	if failed == 0 {
+		return fmt.Sprintf("%d %s", ok, verb)
+	}
+	return fmt.Sprintf("%d %s, %d could not be", ok, verb, failed)
+}