package cn.iocoder.yudao.module.mes.service.pro.task.schedule;
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import java.math.BigDecimal;
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import java.util.HashMap;
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import java.util.Map;
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/** 在一次排产预览内分配库存快照，防止多个工单重复使用同一库存。 */
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final class MesScheduleMaterialCheck {
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private MesScheduleMaterialCheck() {}
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static Map<Long, BigDecimal> allocate(Map<Long, BigDecimal> available, Map<Long, BigDecimal> required) {
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var remaining = new HashMap<>(available);
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required.forEach((itemId, quantity) -> {
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if (itemId == null || quantity == null || quantity.signum() <= 0)
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throw new IllegalArgumentException("工单 BOM 物料或需求数量无效");
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var stock = remaining.getOrDefault(itemId, BigDecimal.ZERO);
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if (stock.compareTo(quantity) < 0)
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throw new IllegalArgumentException("物料#" + itemId + "缺料：需求 " + quantity.stripTrailingZeros().toPlainString()
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+ "，可用 " + stock.stripTrailingZeros().toPlainString());
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remaining.put(itemId, stock.subtract(quantity));
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});
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return remaining;
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}
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}
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