package com.ruoyi.system.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.system.dto.asset.OaApprovalApplicationChangeDTO;
import com.ruoyi.system.emums.ApprovalStatusEnum;
import com.ruoyi.system.emums.ApprovalTypeEnum;
import com.ruoyi.system.mapper.OaApprovalApplicationChangeMapper;
import com.ruoyi.system.model.OaApprovalApplicationAssetItem;
import com.ruoyi.system.model.OaApprovalApplicationChange;
import com.ruoyi.system.model.OaApprovalApplications;
import com.ruoyi.system.model.OaApprovalFlowNode;
import com.ruoyi.system.query.OaApprovalApplicationChangePageQuery;
import com.ruoyi.system.service.AssetMainService;
import com.ruoyi.system.service.OaApprovalApplicationAssetItemService;
import com.ruoyi.system.service.OaApprovalApplicationChangeService;
import com.ruoyi.system.service.OaApprovalApplicationsService;
import com.ruoyi.system.service.OaApprovalFlowNodeService;
import com.ruoyi.system.service.OaApprovalTodoService;
import com.ruoyi.system.vo.asset.AssetMainVO;
import com.ruoyi.system.vo.asset.OaApprovalApplicationChangeDetailVO;
import com.ruoyi.system.vo.asset.OaApprovalApplicationChangePageVO;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * <p>
 * 资产变更审批明细表 服务实现类
 * </p>
 *
 * @author WuGuanFengYue
 * @since 2025-09-15
 */
@Service
@RequiredArgsConstructor
public class OaApprovalApplicationChangeServiceImpl extends ServiceImpl<OaApprovalApplicationChangeMapper, OaApprovalApplicationChange> implements OaApprovalApplicationChangeService {

    private final OaApprovalApplicationsService oaApprovalApplicationsService;
    private final OaApprovalFlowNodeService oaApprovalFlowNodeService;
    private final OaApprovalTodoService oaApprovalTodoService;
    private final OaApprovalApplicationAssetItemService oaApprovalApplicationAssetItemService;
    private final AssetMainService assetMainService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitChange(OaApprovalApplicationChangeDTO dto) {
        if (CollUtil.isEmpty(dto.getAssetMainIds())) {
            throw new ServiceException("资产ID列表不能为空");
        }
        
        // 1. 构建并保存审批主表
        OaApprovalApplications applications = buildOaApprovalApplications(dto);

        // 2. 获取流程首节点，设置当前节点，并保存
        OaApprovalFlowNode firstFlowNode = getFirstFlowNode(ApprovalTypeEnum.ASSET_CHANGE.getCode());
        applications.setCurrentFlowNodeId(firstFlowNode.getId());
        oaApprovalApplicationsService.save(applications);

        // 3. 创建待办
        oaApprovalTodoService.createApprovalTodos(applications.getId(), applications.getApplicationCode(), firstFlowNode, dto.getOwnershipDeptId());

        // 4. 保存变更明细
        OaApprovalApplicationChange detail = buildOaApprovalApplicationChange(dto, applications.getId());
        this.save(detail);

        // 5. 保存关联的资产项
        List<OaApprovalApplicationAssetItem> items = dto.getAssetMainIds().stream()
                .map(i -> {
                    OaApprovalApplicationAssetItem item = new OaApprovalApplicationAssetItem();
                    item.setApprovalApplicationId(applications.getId());
                    item.setAssetMainId(i);
                    return item;
                })
                .collect(Collectors.toList());
        oaApprovalApplicationAssetItemService.saveBatch(items);
    }

    private OaApprovalApplications buildOaApprovalApplications(OaApprovalApplicationChangeDTO dto) {
        OaApprovalApplications applications = BeanUtil.copyProperties(dto, OaApprovalApplications.class);
        applications.setApplicationCode(generateApplicationCode("BG"));
        applications.setApprovalId(ApprovalTypeEnum.ASSET_CHANGE.getCode());
        applications.setApplicationDate(LocalDate.now());
        applications.setApprovalStatus(ApprovalStatusEnum.PENDING.getCode());
        return applications;
    }

    private OaApprovalApplicationChange buildOaApprovalApplicationChange(OaApprovalApplicationChangeDTO dto, Integer applicationId) {
        OaApprovalApplicationChange change = BeanUtil.copyProperties(dto, OaApprovalApplicationChange.class);
        change.setApprovalApplicationId(applicationId);
        return change;
    }

    private OaApprovalFlowNode getFirstFlowNode(Integer approvalId) {
        List<OaApprovalFlowNode> flowNodes = oaApprovalFlowNodeService.lambdaQuery()
                .eq(OaApprovalFlowNode::getApprovalId, approvalId)
                .eq(OaApprovalFlowNode::getStatus, 1)
                .orderByAsc(OaApprovalFlowNode::getSortOrder)
                .list();
        if (CollectionUtils.isEmpty(flowNodes)) {
            throw new ServiceException("未找到有效的审批流程配置");
        }
        return flowNodes.get(0);
    }

    /**
     * 生成申请单号：BG + yyyyMMdd + 3位序号
     */
    private String generateApplicationCode(String prefix) {
        String dateStr = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        prefix = prefix + dateStr;
        Long count = oaApprovalApplicationsService.lambdaQuery()
                .like(OaApprovalApplications::getApplicationCode, prefix)
                .count();
        return prefix + String.format("%03d", count + 1);
    }

    @Override
    public IPage<OaApprovalApplicationChangePageVO> getChangePageList(OaApprovalApplicationChangePageQuery pageQuery) {
        Page<OaApprovalApplicationChangePageVO> page = new Page<>(pageQuery.getPageNum(), pageQuery.getPageSize());
        return this.baseMapper.selectChangePage(page, pageQuery);
    }

    @Override
    public OaApprovalApplicationChangeDetailVO getChangeDetail(Integer id) {
        OaApprovalApplications app = oaApprovalApplicationsService.getById(id);
        if (app == null) {
            throw new ServiceException("审批主记录不存在");
        }
        OaApprovalApplicationChange detail = this.lambdaQuery().eq(OaApprovalApplicationChange::getApprovalApplicationId, app.getId()).one();
        if (detail == null) {
            throw new ServiceException("记录不存在");
        }
        oaApprovalApplicationsService.assembleApplicationDetail(app);
        List<Integer> assetMainIds = oaApprovalApplicationAssetItemService.lambdaQuery()
                .eq(OaApprovalApplicationAssetItem::getApprovalApplicationId, app.getId())
                .list().stream().map(OaApprovalApplicationAssetItem::getAssetMainId)
                .distinct().collect(Collectors.toList());

        List<AssetMainVO> assetMainVOS = assetMainIds.isEmpty() ? Collections.emptyList() : assetMainService.getListByIds(assetMainIds);
        OaApprovalApplicationChangeDetailVO vo = BeanUtil.copyProperties(app, OaApprovalApplicationChangeDetailVO.class);
        vo.setTitle(detail.getTitle());
        vo.setAssetTypeId(detail.getAssetTypeId());
        vo.setAddressType(detail.getAddressType());
        vo.setUseDeptId(detail.getUseDeptId());
        vo.setWarehouseId(detail.getWarehouseId());
        vo.setAddress(detail.getAddress());
        vo.setOwnershipDeptId(detail.getOwnershipDeptId());
        vo.setUserName(detail.getUserName());
        vo.setItems(assetMainVOS);
        return vo;
    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public void deleteByApplicationId(Integer id) {
        OaApprovalApplications applications = oaApprovalApplicationsService.getById(id);
        if (Objects.isNull(applications)) {
            throw new ServiceException("申请记录不存在");
        }
        if (!applications.getApprovalStatus().equals(ApprovalStatusEnum.REFUSED.getCode())) {
            throw new ServiceException("该申请不能删除");
        }
        this.lambdaUpdate().eq(OaApprovalApplicationChange::getApprovalApplicationId, id).remove();
        oaApprovalApplicationAssetItemService.lambdaUpdate().eq(OaApprovalApplicationAssetItem::getApprovalApplicationId, id).remove();
        oaApprovalApplicationsService.removeById(id);
    }
}