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src/utils/promotionPricing.js

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+export function safeTruncate(num, decimals = 2) {
+  if (Number.isNaN(num) || !Number.isFinite(num))
+    return '0.00'
+
+  const factor = 10 ** decimals
+  const scaled = Math.trunc(num * factor)
+  return (scaled / factor).toFixed(decimals)
+}
+
+function calculatePlatformOverpricingCost(price, config) {
+  if (price <= config.p_pricing_standard)
+    return 0
+  return (price - config.p_pricing_standard) * config.p_overpricing_ratio
+}
+
+function calculateSuperiorOverpricingCost(price, config) {
+  if (config.a_overpricing_ratio <= 0)
+    return 0
+  if (price <= config.a_pricing_standard)
+    return 0
+  if (config.a_pricing_end <= config.a_pricing_standard)
+    return 0
+
+  const superiorRangeAmount = Math.min(price, config.a_pricing_end) - config.a_pricing_standard
+  return Math.max(0, superiorRangeAmount) * config.a_overpricing_ratio
+}
+
+export function calculatePromotionPricing(priceInput, config) {
+  if (!config)
+    return { costPrice: '0.00', promotionRevenue: '0.00' }
+
+  const price = Number(priceInput)
+  if (!Number.isFinite(price))
+    return { costPrice: '0.00', promotionRevenue: '0.00' }
+
+  const baseCost = Number(config.cost_price) || 0
+  const platformOverpricingCost = calculatePlatformOverpricingCost(price, config)
+  const superiorOverpricingCost = calculateSuperiorOverpricingCost(price, config)
+  const totalCost = baseCost + platformOverpricingCost + superiorOverpricingCost
+  const revenue = price - totalCost
+
+  return {
+    costPrice: safeTruncate(totalCost),
+    promotionRevenue: safeTruncate(revenue),
+  }
+}