package com.yunhai.cms.service.impl;

import com.yunhai.cms.entity.CmsCategory;
import com.yunhai.cms.entity.CmsPerson;
import com.yunhai.cms.event.SiteContentChangedEvent;
import com.yunhai.cms.model.dto.DeleteRequest;
import com.yunhai.cms.model.dto.PersonSaveRequest;
import com.yunhai.cms.model.vo.PersonVo;
import com.yunhai.cms.repository.CmsCategoryRepository;
import com.yunhai.cms.repository.CmsPersonRepository;
import com.yunhai.platform.apistd.BizException;
import com.yunhai.platform.utils.exception.ErrorCode;
import com.yunhai.platform.utils.model.BoaUser;
import lombok.RequiredArgsConstructor;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 名师风采人物管理（docs/20 D-7）：站点级 CRUD + people 区块数据源。
 * 头像附件引用走 scene=person（B2 模型）；categoryId 须属于本站点（防跨站注入）。
 */
@Service
@RequiredArgsConstructor
public class PersonService {

    private final CmsPersonRepository personRepository;
    private final CmsCategoryRepository categoryRepository;
    private final SiteService siteService;
    private final AttachmentService attachmentService;
    private final ApplicationEventPublisher eventPublisher;

    public List<PersonVo> list(BoaUser user, Integer siteId) {
        siteService.requireManageable(user, siteId);
        return personRepository.findBySiteIdOrderBySortNoAscIdAsc(siteId).stream()
                .map(PersonVo::of)
                .collect(Collectors.toList());
    }

    @Transactional
    public PersonVo save(BoaUser user, PersonSaveRequest req) {
        siteService.requireManageable(user, req.getSiteId());
        if (req.getCategoryId() != null) {
            CmsCategory category = categoryRepository.findById(req.getCategoryId())
                    .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "所属栏目不存在"));
            if (!category.getSiteId().equals(req.getSiteId())) {
                throw new BizException(ErrorCode.PARAM_ERROR, "所属栏目不属于本站点");
            }
        }
        CmsPerson person;
        if (req.getId() == null) {
            person = new CmsPerson();
            person.setSiteId(req.getSiteId());
        } else {
            person = personRepository.findById(req.getId())
                    .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "人物不存在"));
            if (!person.getSiteId().equals(req.getSiteId())) {
                throw new BizException(ErrorCode.FORBIDDEN, "无权修改该人物");
            }
        }
        person.setName(req.getName());
        person.setTitle(req.getTitle());
        person.setBio(req.getBio());
        person.setAvatar(req.getAvatar());
        person.setCategoryId(req.getCategoryId());
        person.setSortNo(req.getSortNo() == null ? 0 : req.getSortNo());
        person.setStatus(req.getStatus() == null ? 1 : req.getStatus());
        person = personRepository.save(person);
        // B2 附件引用：先解引用再回写新头像（编辑换图时旧图回未使用）；幂等
        attachmentService.release("person", person.getId());
        if (StringUtils.hasText(req.getAvatar())) {
            attachmentService.markUsed(req.getSiteId(), req.getAvatar(), "person", person.getId());
        }
        eventPublisher.publishEvent(new SiteContentChangedEvent(req.getSiteId(), "person"));
        return PersonVo.of(person);
    }

    @Transactional
    public void delete(BoaUser user, DeleteRequest req) {
        CmsPerson person = personRepository.findById(req.getId())
                .orElseThrow(() -> new BizException(ErrorCode.PARAM_ERROR, "人物不存在"));
        siteService.requireManageable(user, req.getSiteId());
        if (!person.getSiteId().equals(req.getSiteId())) {
            throw new BizException(ErrorCode.FORBIDDEN, "无权删除该人物");
        }
        personRepository.delete(person);
        attachmentService.release("person", person.getId());
        eventPublisher.publishEvent(new SiteContentChangedEvent(req.getSiteId(), "person"));
    }
}