package com.xiaopeng.account.service.impl;

import com.xiaopeng.account.mapper.XpAppUserMapper;
import com.xiaopeng.account.service.IXpAppUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xiaopeng.api.dto.statistics.DailyCountDTO;
import com.xiaopeng.api.dto.statistics.StatisticsQueryDTO;
import com.xiaopeng.api.dto.statistics.UserStatisticsDTO;
import com.xiaopeng.api.model.account.XpAppUser;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 小程序用户 服务实现类
 * </p>
 *
 * @author mitao
 * @since 2026-02-03
 */
@Service
public class XpAppUserServiceImpl extends ServiceImpl<XpAppUserMapper, XpAppUser> implements IXpAppUserService {

    @Override
    public UserStatisticsDTO getUserStatistics(StatisticsQueryDTO query) {
        UserStatisticsDTO dto = new UserStatisticsDTO();

        // 1. 查询用户总数
        dto.setTotalCount(baseMapper.selectCount(null));

        // 2. 查询时间范围内新增用户数
        if (query.getStartDate() != null && query.getEndDate() != null) {
            dto.setNewCount(baseMapper.countNewUsers(query.getStartDate(), query.getEndDate()));
        } else {
            dto.setNewCount(0L);
        }

        // 3. 查询近N天每日新增用户数（默认30天）
        Integer trendDays = query.getTrendDays() != null ? query.getTrendDays() : 30;
        LocalDate endDate = LocalDate.now();
        LocalDate startDate = endDate.minusDays(trendDays - 1);
        List<DailyCountDTO> dailyCountList = baseMapper.getDailyUserCount(startDate, endDate);
        dto.setDailyCountList(dailyCountList != null ? dailyCountList : new ArrayList<>());

        return dto;
    }

    @Override
    public List<XpAppUser> listByIds(List<Long> ids) {
        if (CollectionUtils.isEmpty(ids)) {
            return new ArrayList<>();
        }
        return super.listByIds(ids);
    }
}