package com.mh.common.utils;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiPredicate;

/**
 * @author LJF
 * @version 1.0
 * @project EEMCS
 * @description 数据比较值
 * @date 2025-02-21 15:56:56
 */
public class BigDecimalUtils {
    // 定义运算符与比较逻辑的映射
    private static final Map<String, BiPredicate<BigDecimal, BigDecimal>> OPERATORS = new HashMap<>();

    static {
        // 初始化支持的运算符
        OPERATORS.put(">",  (a, b) -> a.compareTo(b) > 0);
        OPERATORS.put(">=", (a, b) -> a.compareTo(b) >= 0);
        OPERATORS.put("<",  (a, b) -> a.compareTo(b) < 0);
        OPERATORS.put("<=", (a, b) -> a.compareTo(b) <= 0);
        OPERATORS.put("==", (a, b) -> a.compareTo(b) == 0);
        OPERATORS.put("=",  (a, b) -> a.compareTo(b) == 0); // 添加对 = 运算符的支持
        OPERATORS.put("!=", (a, b) -> a.compareTo(b) != 0);
    }

    /**
     * 根据运算符比较两个 BigDecimal
     * @param operator 运算符（如 ">", ">="）
     * @param a 第一个数值
     * @param b 第二个数值
     * @return 比较结果
     * @throws IllegalArgumentException 如果运算符无效
     */
    public static boolean compare(String operator, BigDecimal a, BigDecimal b) {
        BiPredicate<BigDecimal, BigDecimal> predicate = OPERATORS.get(operator);
        if (predicate == null) {
            throw new IllegalArgumentException("不支持的运算符: " + operator);
        }
        return predicate.test(a, b);
    }

    public static void main(String[] args) {
        BigDecimal a = new BigDecimal("10.00");
        BigDecimal b = new BigDecimal("10.00");
        System.out.println(compare(">", a, b));
        System.out.println(compare(">=", a, b));
        System.out.println(compare("<", a, b));
        System.out.println(compare("<=", a, b));
        System.out.println(compare("==", a, b));
        System.out.println(compare("!=", a, b));
    }
}