package com.yunhai.acaclassassign.service.assign;

import java.util.HashMap;
import java.util.Map;

/**
 * 姓名同音判定：内置常用同音字组（姓氏 + 名字常用字）。
 * <p>同组内任意字视为同音。soundKey 将姓名逐字映射为组代表字/原字后拼接。</p>
 */
public final class SameSound {

    private SameSound() {
    }

    /** 同音字组（移植自分班原型 45 组常用同音字表） */
    private static final String[] GROUPS = {
            "张章彰樟", "李理莉鲤里", "王旺望", "刘留流榴", "陈晨尘辰橙",
            "杨扬洋阳羊", "黄煌凰皇", "赵兆照罩", "吴梧吾无芜", "徐绪储",
            "孙损笋", "马玛码", "朱珠株珠诸", "胡湖糊蝴狐", "郭锅国帼",
            "何合河荷和", "高膏糕羔", "林淋琳霖麟", "罗锣萝箩络", "郑正证政挣",
            "梁粱良凉", "谢卸蟹泄", "宋送诵颂", "唐糖塘堂棠", "许序絮绪",
            "韩含寒涵涵函", "冯逢缝凤", "邓灯登等", "曹槽草漕", "彭澎蓬鹏棚",
            "曾增憎", "肖削消宵萧潇霄", "田填甜佃", "董懂冬", "袁元园原源圆员",
            "蔡菜采彩", "蒋桨讲奖", "余鱼渔愉于娱俞豫", "杜肚度渡镀", "叶页夜业",
            "程成城诚呈橙乘", "苏酥俗", "魏位未卫味畏", "吕铝侣旅履", "丁钉叮盯叮宁"
    };

    private static final Map<Character, Character> CHAR_TO_REP = new HashMap<>();

    static {
        for (String group : GROUPS) {
            final char rep = group.charAt(0);
            for (char c : group.toCharArray()) {
                CHAR_TO_REP.putIfAbsent(c, rep);
            }
        }
    }

    /**
     * 姓名同音键：逐字映射同音组代表字后拼接。
     */
    public static String soundKey(String name) {
        if (name == null) {
            return "";
        }
        final String trimmed = name.trim();
        final StringBuilder sb = new StringBuilder(trimmed.length());
        for (int i = 0; i < trimmed.length(); i++) {
            final Character rep = CHAR_TO_REP.get(trimmed.charAt(i));
            sb.append(rep == null ? trimmed.charAt(i) : rep.charValue());
        }
        return sb.toString();
    }
}