add AIAgent

src/utils/package.ts

@@ -85,6 +85,21 @@ export function convertPackageQuantity(quantity: number | string, fromBaseQuanti
 	return formatDecimal(numerator / denominator, 3, 3);
 }
 
+/** 将基础单位数量换算为业务单位展示数量，结果最多保留三位小数。 */
+export function convertBaseQuantityToPackageQuantity(baseQuantity: number | string, baseQuantityPerUnit: number | string): string | undefined {
+	const quantityParts = toDecimalParts(baseQuantity, 3);
+	const unitParts = toDecimalParts(baseQuantityPerUnit, 6);
+	if (!quantityParts || !unitParts || unitParts.value === 0n) {
+		return undefined;
+	}
+	const numerator = quantityParts.value * 10n ** BigInt(unitParts.scale + 3);
+	const denominator = 10n ** BigInt(quantityParts.scale) * unitParts.value;
+	const quotient = numerator / denominator;
+	const remainder = numerator % denominator;
+	const rounded = denominator < remainder * 2n ? quotient + 1n : quotient;
+	return formatDecimal(rounded, 3, 3);
+}
+
 /** 精确相加两个最多三位小数的数量。 */
 export function addPackageQuantity(left: number | string, right: number | string): string | undefined {
 	const leftParts = toQuantityParts(left);