package com.tcm.training.admin.app.home.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.tcm.training.admin.app.home.vo.AppHomeBannerVO;
import com.tcm.training.admin.system.entity.SystemBannerConfig;
import com.tcm.training.admin.system.mapper.SystemBannerConfigMapper;
import org.springframework.stereotype.Service;

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

/**
 * APP 首页 banner 服务。
 */
@Service
public class AppHomeBannerService {

    private final SystemBannerConfigMapper systemBannerConfigMapper;

    /**
     * 注入 banner 配置查询能力。
     */
    public AppHomeBannerService(SystemBannerConfigMapper systemBannerConfigMapper) {
        this.systemBannerConfigMapper = systemBannerConfigMapper;
    }

    /**
     * 查询 APP 首页可展示的 banner 列表。
     */
    public List<AppHomeBannerVO> listEnabledBanners() {
        LocalDateTime now = LocalDateTime.now();
        List<SystemBannerConfig> records = systemBannerConfigMapper.selectList(new LambdaQueryWrapper<SystemBannerConfig>()
                .eq(SystemBannerConfig::getDeleted, 0)
                .eq(SystemBannerConfig::getPublishEnabled, 1)
                .le(SystemBannerConfig::getStartAt, now)
                .ge(SystemBannerConfig::getEndAt, now)
                .orderByDesc(SystemBannerConfig::getId));
        List<AppHomeBannerVO> result = new ArrayList<AppHomeBannerVO>(records.size());
        for (SystemBannerConfig record : records) {
            result.add(toBannerVO(record));
        }
        return result;
    }

    /**
     * 将后台 banner 配置转换为 APP 首页展示对象。
     */
    private AppHomeBannerVO toBannerVO(SystemBannerConfig record) {
        AppHomeBannerVO vo = new AppHomeBannerVO();
        vo.setId(record.getId());
        vo.setImageUrl(record.getBannerImg());
        vo.setTitle(record.getTitle());
        vo.setJumpType(record.getJumpType());
        vo.setTargetId(record.getTargetId());
        vo.setTargetUrl(record.getTargetUrl());
        return vo;
    }
}