package com.ruoyi.http.util;
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import com.alibaba.fastjson2.JSONArray;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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/**
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* 电量读数与倍率计算
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*/
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public final class StatisticEleReadingUtil {
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public static final int CONSUMPTION_SCALE = 4;
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private StatisticEleReadingUtil() {
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}
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public static BigDecimal firstReading(JSONArray arr) {
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if (arr == null || arr.isEmpty()) {
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return null;
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}
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return arr.getBigDecimal(0);
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}
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public static BigDecimal calcConsumption(BigDecimal prev, BigDecimal curr, Integer ratio) {
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if (prev == null || curr == null) {
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return null;
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}
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BigDecimal diff = curr.subtract(prev);
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return applyRatio(diff, ratio);
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}
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public static BigDecimal calcConsumptionFromRaw(BigDecimal raw, Integer ratio) {
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if (raw == null) {
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return null;
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}
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return applyRatio(raw, ratio);
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}
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public static BigDecimal applyRatio(BigDecimal value, Integer ratio) {
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if (value == null) {
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return null;
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}
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int r = ratio == null || ratio <= 0 ? 1 : ratio;
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return value.multiply(BigDecimal.valueOf(r)).setScale(CONSUMPTION_SCALE, RoundingMode.HALF_UP);
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}
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public static String formatReadingArray(JSONArray arr) {
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if (arr == null || arr.isEmpty()) {
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return "";
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}
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < arr.size(); i++) {
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if (i > 0) {
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sb.append("/");
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}
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sb.append(arr.getDouble(i));
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}
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return sb.toString();
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}
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public static BigDecimal parseFirstReading(String reading) {
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if (reading == null || reading.isBlank()) {
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return null;
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}
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int idx = reading.indexOf('/');
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String first = idx > 0 ? reading.substring(0, idx) : reading;
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try {
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return new BigDecimal(first.trim());
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} catch (NumberFormatException e) {
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return null;
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}
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}
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}
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