package com.user;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.ArrayList;
import java.util.List;
/**
 * @Author toutou
 * @Date 2023/2/18
 * @Des
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class User {
    private Integer id;
    /**
     * 等级
     */
    private int grade;
    /**
     * 所在省份id
     */
    private int provinceId;
    /**
     * 所在城市ID
     */
    private int cityId;
    /**
     * 是否是活跃用户，true活跃，false不活跃
     */
    private boolean lively;
    /**
     * 是否开通支付，true开通，false未开通
     */
    private boolean pay;
    public static List<User> getTestUserList() {
        List<User> list = new ArrayList<>();
        list.add(User.builder().id(0).grade(1).provinceId(1).cityId(22).lively(false).pay(false).build());
        list.add(User.builder().id(1).grade(1).provinceId(1).cityId(100).lively(true).pay(true).build());
        list.add(User.builder().id(2).grade(3).provinceId(5).cityId(100).lively(true).pay(true).build());
        list.add(User.builder().id(3).grade(2).provinceId(1).cityId(98).lively(true).pay(true).build());
        list.add(User.builder().id(4).grade(2).provinceId(1).cityId(100).lively(true).pay(true).build());
        list.add(User.builder().id(5).grade(2).provinceId(3).cityId(100).lively(true).pay(true).build());
        list.add(User.builder().id(6).grade(2).provinceId(1).cityId(101).lively(true).pay(false).build());
        list.add(User.builder().id(7).grade(1).provinceId(6).cityId(100).lively(false).pay(true).build());
        list.add(User.builder().id(8).grade(1).provinceId(1).cityId(98).lively(true).pay(false).build());
        list.add(User.builder().id(9).grade(1).provinceId(5).cityId(100).lively(true).pay(true).build());
        return list;
    }
}

package com.util;
import java.math.BigDecimal;
import java.util.List;
/**
 * @Author toutou
 * @Date 2023/2/18
 * @Des
 */
public class SortHelper {
    /**
     * 比较两个BigDecimal集合
     * @param left
     * @param right
     * @return leftList<rightList返回-1;leftList=rightList返回0;leftList>rightList返回1;
     */
    public static int compareBigDecimalList(List<BigDecimal> left, List<BigDecimal> right) {
        int length = Math.max(left.size(), right.size());
        for (int i = 0; i < length; i++) {
            if (left.size() < i + 1) {
                return -1;
            }
            if (right.size() < i + 1) {
                return 1;
            }
            int value = left.get(i).compareTo(right.get(i));
            if (value != 0) {
                return value;
            }
        }
        return 0;
    }
}

package com.util;
import com.user.User;
import org.apache.commons.lang3.tuple.ImmutablePair;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
import reactor.core.publisher.Flux;
/**
 * @Author toutou
 * @Date 2023/2/18
 * @Des
 */
public class Sort {
    /**
     * 当前用户所在城市id，所在省份id
     * @param cityId
     * @param provinceId
     * @return
     */
    public List<User> sortUserList(int cityId, int provinceId) {
        // 获取初始化测试list数据
        List<User> list = User.getTestUserList();
        if(list == null || list.size() == 0){
            return list;
        }
        List<ImmutablePair<User, List<BigDecimal>>> userAndScore = new ArrayList<>();
        for (User user : list){
            // 初始化一个排序的分值list
            List<BigDecimal> scoreList = Flux.range(0, 6).map(p -> BigDecimal.ZERO).collectList().block();
            userAndScore.add(new ImmutablePair<>(user, scoreList));
            if(user.isPay()){
                // 付费用户排序，付费用户为1，非付费用户为2
                scoreList.set(0, BigDecimal.valueOf(1));
                if(user.getCityId() == cityId){
                    scoreList.set(1, BigDecimal.valueOf(1));
                }else{
                    scoreList.set(1, BigDecimal.valueOf(2));
                }
                if(user.getProvinceId() == provinceId){
                    scoreList.set(2, BigDecimal.valueOf(1));
                }else{
                    scoreList.set(2, BigDecimal.valueOf(2));
                }
                scoreList.set(3, BigDecimal.valueOf(-user.getGrade()));
                if(user.isLively()){
                    scoreList.set(4, BigDecimal.valueOf(1));
                }else{
                    scoreList.set(4, BigDecimal.valueOf(2));
                }
                scoreList.set(5, BigDecimal.valueOf(-user.getId()));
            }else{
                scoreList.set(0, BigDecimal.valueOf(2));
                scoreList.set(1, BigDecimal.valueOf(-user.getGrade()));
                if(user.getCityId() == cityId){
                    scoreList.set(2, BigDecimal.valueOf(1));
                }else{
                    scoreList.set(2, BigDecimal.valueOf(2));
                }
                scoreList.set(3, BigDecimal.valueOf(-user.getId()));
            }
        }
        return userAndScore.stream().sorted(Comparator.comparing(p -> p.getValue(), SortHelper::compareBigDecimalList)).map(ImmutablePair::getLeft).collect(Collectors.toList());
    }
}