fix(amazon-shopping): verify prime and delivery filters

skills/amazon-shopping/src/product-metrics.ts

@@ -0,0 +1,62 @@
+import type { ProductSearchResult, ProductSpec } from "./types.js";
+
+function parseDimensionNumber(text: string): number | undefined {
+  const match = text.match(/([0-9]+(?:\.[0-9]+)?)/);
+  return match ? Number(match[1]) : undefined;
+}
+
+function isOverallWidthSpec(spec: ProductSpec): boolean {
+  const name = spec.name.toLowerCase();
+  if (/seat|arm|door|package|box|back|cushion/.test(name)) {
+    return false;
+  }
+  return /width|dimensions?/.test(name);
+}
+
+function widthFromSpec(spec: ProductSpec): number | undefined {
+  if (!isOverallWidthSpec(spec)) {
+    return undefined;
+  }
+
+  const name = spec.name.toLowerCase();
+  const value = spec.value;
+  const labeledWidth = value.match(/([0-9]+(?:\.[0-9]+)?)\s*(?:"|in(?:ches?)?)?\s*W\b/i);
+  if (labeledWidth) {
+    return Number(labeledWidth[1]);
+  }
+
+  if (/width/.test(name)) {
+    return parseDimensionNumber(value);
+  }
+
+  const orderMatch = name.match(/\b([dwh])\s*x\s*([dwh])(?:\s*x\s*([dwh]))?\b/i);
+  if (orderMatch) {
+    const order = orderMatch.slice(1).filter(Boolean).map((part) => part.toLowerCase());
+    const widthIndex = order.indexOf("w");
+    const values = value.match(/[0-9]+(?:\.[0-9]+)?/g)?.map(Number) ?? [];
+    if (widthIndex >= 0 && values[widthIndex] !== undefined) {
+      return values[widthIndex];
+    }
+  }
+
+  return undefined;
+}
+
+export function extractWidthInches(product: ProductSearchResult): number | undefined {
+  for (const spec of product.specs) {
+    const width = widthFromSpec(spec);
+    if (width !== undefined) {
+      return width;
+    }
+  }
+
+  const titleMatch = product.title.match(/\b([0-9]+(?:\.[0-9]+)?)\s*(?:["”]|in(?:ch(?:es)?)?)\b/i);
+  return titleMatch ? Number(titleMatch[1]) : undefined;
+}
+
+export function formatWidthInches(width: number | undefined): string {
+  if (width === undefined) {
+    return "unknown";
+  }
+  return `${Number.isInteger(width) ? width.toFixed(0) : width.toFixed(1)}"`;
+}