link sku

viz/app/linker/price.js

@@ -0,0 +1,78 @@
+// viz/app/linker/price.js
+export function buildPricePenaltyForPair({ allAgg, rules, kPerGroup = 6 }) {
+    // canonSku -> sorted array of up to kPerGroup lowest prices
+    const groupPrices = new Map();
+  
+    function insertPrice(arr, p) {
+      // keep sorted ascending, cap length
+      let i = 0;
+      while (i < arr.length && arr[i] <= p) i++;
+      arr.splice(i, 0, p);
+      if (arr.length > kPerGroup) arr.length = kPerGroup;
+    }
+  
+    for (const it of allAgg || []) {
+      if (!it) continue;
+      const sku = String(it.sku || "");
+      if (!sku) continue;
+  
+      const p = it.cheapestPriceNum;
+      if (p == null || !(p > 0)) continue;
+  
+      const canon = String((rules && rules.canonicalSku && rules.canonicalSku(sku)) || sku);
+      let arr = groupPrices.get(canon);
+      if (!arr) groupPrices.set(canon, (arr = []));
+      insertPrice(arr, p);
+    }
+  
+    function bestRelativeGap(prA, prB) {
+      // min |a-b| / min(a,b)
+      let best = Infinity;
+      for (let i = 0; i < prA.length; i++) {
+        const a = prA[i];
+        for (let j = 0; j < prB.length; j++) {
+          const b = prB[j];
+          const gap = Math.abs(a - b) / Math.max(1e-9, Math.min(a, b));
+          if (gap < best) best = gap;
+          if (best <= 0.001) return best;
+        }
+      }
+      return best;
+    }
+  
+    function gapToMultiplier(gap) {
+      // gap = 0.40 => 40% relative difference
+      // <=35%: no penalty
+      // 35-50%: ease down to ~0.75
+      // >50%: continue down gently, floor at 0.35
+      if (!(gap >= 0)) return 1.0;
+      if (gap <= 0.35) return 1.0;
+  
+      if (gap <= 0.50) {
+        const t = (gap - 0.35) / 0.15; // 0..1
+        return 1.0 - 0.25 * t; // 1.00 -> 0.75
+      }
+  
+      const m = 0.75 * (0.5 / gap);
+      return Math.max(0.35, m);
+    }
+  
+    return function pricePenaltyForPair(aSku, bSku) {
+      const a = String(aSku || "");
+      const b = String(bSku || "");
+      if (!a || !b) return 1.0;
+  
+      const aCanon = String((rules && rules.canonicalSku && rules.canonicalSku(a)) || a);
+      const bCanon = String((rules && rules.canonicalSku && rules.canonicalSku(b)) || b);
+  
+      const prA = groupPrices.get(aCanon);
+      const prB = groupPrices.get(bCanon);
+      if (!prA || !prB || !prA.length || !prB.length) return 1.0;
+  
+      const gap = bestRelativeGap(prA, prB);
+      if (!isFinite(gap)) return 1.0;
+  
+      return gapToMultiplier(gap);
+    };
+  }
+  

viz/app/linker/suggestions.js

@@ -63,6 +63,7 @@ export function recommendSimilar(
     mappedSkus,
     isIgnoredPairFn,
     sizePenaltyFn,
+    pricePenaltyFn,
     sameStoreFn,
     sameGroupFn
   ) {
@@ -169,6 +170,11 @@ export function recommendSimilar(
       if (typeof sizePenaltyFn === "function") {
         s0 *= sizePenaltyFn(pinnedSku, itSku);
       }
+
+      // Price penalty early
+      if (typeof pricePenaltyFn === "function") {
+        s0 *= pricePenaltyFn(pinnedSku, itSku);
+      }
   
       // Age handling early
       const itAge = extractAgeFromText(itNorm);
@@ -215,6 +221,11 @@ export function recommendSimilar(
         s *= sizePenaltyFn(pinnedSku, itSku);
         if (s <= 0) continue;
       }
+
+      if (typeof pricePenaltyFn === "function") {
+        s *= pricePenaltyFn(pinnedSku, itSku);
+        if (s <= 0) continue;
+      }
   
       const itAge = extractAgeFromText(itNorm);
       if (pinAge && itAge) {
@@ -263,7 +274,8 @@ export function recommendSimilar(
     limitPairs,
     isIgnoredPairFn,
     sameStoreFn,
-    sizePenaltyFn // ✅ NEW: pass sizePenaltyForPair in
+    sizePenaltyFn, // ✅ NEW: pass sizePenaltyForPair in
+    pricePenaltyFn
   ) {
     const itemsAll = allAgg.filter((it) => !!it);
   
@@ -455,6 +467,8 @@ export function recommendSimilar(
         }
   
         if (typeof sizePenaltyFn === "function") s *= sizePenaltyFn(aSku, bSku);
+
+        if (typeof pricePenaltyFn === "function") s *= pricePenaltyFn(aSku, bSku);
   
         const bAge = extractAgeFromText(bNorm);
         if (aAge && bAge) {
@@ -494,6 +508,11 @@ export function recommendSimilar(
           s *= sizePenaltyFn(aSku, bSku);
           if (s <= 0) continue;
         }
+
+        if (typeof pricePenaltyFn === "function") {
+          s *= pricePenaltyFn(aSku, bSku);
+          if (s <= 0) continue;
+        }
   
         if (aAge && x.bAge) {
           if (aAge === x.bAge) s *= 2.0;
@@ -577,4 +596,3 @@ export function recommendSimilar(
     }
     return h >>> 0;
 }
-  

viz/app/linker_page.js

@@ -31,6 +31,7 @@ import { buildCanonStoreCache, makeSameStoreCanonFn } from "./linker/store_cache
 import { buildSizePenaltyForPair } from "./linker/size.js";
 import { pickPreferredCanonical } from "./linker/canonical_pref.js";
 import { smwsKeyFromName } from "./linker/similarity.js";
+import { buildPricePenaltyForPair } from "./linker/price.js";
 import {
   topSuggestions,
   recommendSimilar,
@@ -124,10 +125,14 @@ export async function renderSkuLinker($app) {
   // ✅ canonical-group size cache + helper
   let sizePenaltyForPair = buildSizePenaltyForPair({ allRows, allAgg, rules });
 
+  // ✅ canonical-group price cache + helper
+  let pricePenaltyForPair = buildPricePenaltyForPair({ allAgg, rules });
+
   function rebuildCachesAfterRulesReload() {
     CANON_STORE_CACHE = buildCanonStoreCache(allAgg, rules);
     sameStoreCanon = makeSameStoreCanonFn(rules, CANON_STORE_CACHE);
     sizePenaltyForPair = buildSizePenaltyForPair({ allRows, allAgg, rules });
+    pricePenaltyForPair = buildPricePenaltyForPair({ allAgg, rules });
   }
 
   function isIgnoredPair(a, b) {
@@ -156,7 +161,8 @@ export async function renderSkuLinker($app) {
       28,
       isIgnoredPair,
       sameStoreCanon,
-      sizePenaltyForPair // ✅ NEW
+      sizePenaltyForPair, // ✅ NEW
+      pricePenaltyForPair // ✅ NEW
     );
   
     return initialPairs;
@@ -240,6 +246,7 @@ export async function renderSkuLinker($app) {
         mappedSkus,
         isIgnoredPair,
         sizePenaltyForPair,
+        pricePenaltyForPair,
         sameStoreCanon,
         sameGroup
       );