package com.ruoyi.system.service.impl;

import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.core.domain.entity.SysDept;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.system.dto.OaApprovalApplicationPurchaseDTO;
import com.ruoyi.system.emums.ApprovalStatusEnum;
import com.ruoyi.system.mapper.OaApprovalApplicationPurchaseMapper;
import com.ruoyi.system.model.OaApprovalApplicationPurchase;
import com.ruoyi.system.model.OaApprovalApplicationPurchaseItem;
import com.ruoyi.system.model.OaApprovalApplications;
import com.ruoyi.system.model.OaApprovalFlowNode;
import com.ruoyi.system.model.OaApprovalTodo;
import com.ruoyi.system.service.ISysDeptService;
import com.ruoyi.system.service.ISysUserService;
import com.ruoyi.system.service.OaApprovalApplicationPurchaseItemService;
import com.ruoyi.system.service.OaApprovalApplicationPurchaseService;
import com.ruoyi.system.service.OaApprovalApplicationsService;
import com.ruoyi.system.service.OaApprovalFlowNodeService;
import com.ruoyi.system.service.OaApprovalTodoService;
import lombok.RequiredArgsConstructor;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * <p>
 * 采购申请详情 服务实现类
 * </p>
 *
 * @author WuGuanFengYue
 * @since 2025-09-15
 */
@Service
@RequiredArgsConstructor
public class OaApprovalApplicationPurchaseServiceImpl extends ServiceImpl<OaApprovalApplicationPurchaseMapper, OaApprovalApplicationPurchase> implements OaApprovalApplicationPurchaseService {

    private final OaApprovalApplicationsService oaApprovalApplicationsService;
    private final OaApprovalApplicationPurchaseItemService oaApprovalApplicationPurchaseItemService;
    private final OaApprovalFlowNodeService oaApprovalFlowNodeService;
    private final OaApprovalTodoService oaApprovalTodoService;
    private final ISysUserService sysUserService;
    private final ISysDeptService sysDeptService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submit(OaApprovalApplicationPurchaseDTO dto) {
        // 1. 保存审批申请主表数据
        OaApprovalApplications applications = buildOaApprovalApplications(dto);
        
        // 2. 如果是提交操作，获取流程节点并创建待办
        OaApprovalFlowNode firstFlowNode = getFirstFlowNode(dto.getApprovalId());
        applications.setCurrentFlowNodeId(firstFlowNode.getId());
        oaApprovalApplicationsService.save(applications);

        // 3.创建待办事项记录
        createApprovalTodo(applications.getId(), applications.getApplicationCode(), firstFlowNode, dto.getDeptId());

        // 4.保存采购资产明细数据
        List<OaApprovalApplicationPurchaseItem> items = buildOaApprovalApplicationPurchaseItems(dto, applications.getId());
        oaApprovalApplicationPurchaseItemService.saveBatch(items);

        // 5. 保存采购申请详情数据
        OaApprovalApplicationPurchase purchase = buildOaApprovalApplicationPurchase(dto, applications.getId());
        save(purchase);
    }
    /**
     * 获取第一个流程节点
     */
    private OaApprovalFlowNode getFirstFlowNode(Integer approvalId) {
        // 1. 查询审批流程配置
        List<OaApprovalFlowNode> flowNodes = oaApprovalFlowNodeService.lambdaQuery()
                .eq(OaApprovalFlowNode::getApprovalId, approvalId)
                .eq(OaApprovalFlowNode::getStatus, 1) // 启用状态
                .orderByAsc(OaApprovalFlowNode::getSortOrder)
                .list();

        if (CollectionUtils.isEmpty(flowNodes)) {
            throw new ServiceException("未找到有效的审批流程配置");
        }

        // 2. 获取第一个流程节点
        return flowNodes.get(0);
    }

    /**
     * 创建待办数据
     */
    private void createApprovalTodo(Long applicationId, String applicationCode, OaApprovalFlowNode flowNode, Integer deptId) {
        // 根据审批类型创建待办数据
        Integer approvalType = flowNode.getApprovalType();
        if (approvalType == null) {
            throw new ServiceException("审批类型不能为空");
        }

        switch (approvalType) {
            case 0: // 上级部门审批
                createUpperDeptTodo(applicationId, applicationCode, flowNode, deptId);
                break;
            case 1: // 指定部门审批
                createSpecifiedDeptTodo(applicationId, applicationCode, flowNode);
                break;
            case 2: // 指定人员审批
                createSpecifiedUserTodo(applicationId, applicationCode, flowNode);
                break;
            default:
                throw new ServiceException("不支持的审批类型: " + approvalType);
        }
    }
    /**
     * 创建上级部门审批待办
     */
    private void createUpperDeptTodo(Long applicationId, String applicationCode, OaApprovalFlowNode flowNode, Integer deptId) {
        // 1. 获取申请部门信息
        if (deptId == null) {
            throw new ServiceException("未填写申请部门信息");
        }

        SysDept currentDept = sysDeptService.selectDeptById(Long.valueOf(deptId));
        if (currentDept == null) {
            throw new ServiceException("申请部门信息不存在");
        }

        // 2. 获取上级部门信息
        if (currentDept.getParentId() == null || currentDept.getParentId() == 0) {
            throw new ServiceException("当前部门没有上级部门");
        }

        SysDept parentDept = sysDeptService.selectDeptById(currentDept.getParentId());
        if (parentDept == null) {
            throw new ServiceException("上级部门信息不存在");
        }

        // 3. 查询所有关联了该上级部门的用户
        List<SysUser> users = sysUserService.selectListByDeptId(parentDept.getDeptId().toString());
        if (CollUtil.isEmpty(users)) {
            throw new ServiceException("上级部门下没有找到用户");
        }

        // 4. 为每个用户创建待办数据
        createTodoItem(applicationId, applicationCode, flowNode, users);
    }

    /**
     * 创建指定部门审批待办
     */
    private void createSpecifiedDeptTodo(Long applicationId, String applicationCode, OaApprovalFlowNode flowNode) {
        if (StringUtils.isBlank(flowNode.getApprovalIds())) {
            throw new ServiceException("操作失败，审批流程配置异常");
        }
        // 收集部门ID
        List<String> deptIdList = Arrays.stream(flowNode.getApprovalIds().split(",")).collect(Collectors.toList());

        // 查询所有关联了这些部门的用户
        List<SysUser> users = sysUserService.selectListByDeptIds(deptIdList);
        if (CollUtil.isEmpty(users)) {
            throw new ServiceException("指定部门下没有找到用户");
        }

        // 为每个用户创建待办数据
        createTodoItem(applicationId, applicationCode, flowNode, users);
    }

    /**
     * 创建指定人员审批待办
     */
    private void createSpecifiedUserTodo(Long applicationId, String applicationCode, OaApprovalFlowNode flowNode) {
        if (StringUtils.isBlank(flowNode.getApprovalIds())) {
            throw new ServiceException("操作失败，审批流程配置异常");
        }
        List<Integer> userIds = Arrays.stream(flowNode.getApprovalIds().split(","))
                .map(Integer::valueOf).collect(Collectors.toList());
        // 1. 查询用户信息
        List<SysUser> users = sysUserService.selectListByUserIds(userIds);
        if (CollUtil.isEmpty(users)) {
            throw new ServiceException("没有找到指定审批用户");
        }
        //2. 创建待办数据
        createTodoItem(applicationId, applicationCode, flowNode, users);
    }

    /**
     * 创建待办数据项
     */
    private void createTodoItem(Long applicationId, String applicationCode, OaApprovalFlowNode flowNode, List<SysUser> userList) {
        List<OaApprovalTodo> approvalTodoList = userList.stream().map(item -> {
            OaApprovalTodo todo = new OaApprovalTodo();
            todo.setApplicationId(applicationId);
            todo.setApplicationCode(applicationCode);
            todo.setFlowNodeId(flowNode.getId());
            todo.setUserId(item.getUserId().intValue());
            todo.setUserName(item.getNickName());

            // 设置部门信息
            if (item.getDeptId() != null) {
                todo.setDeptId(Integer.valueOf(item.getDeptId()));
            }

            todo.setSortOrder(flowNode.getSortOrder());
            todo.setStatus(0); // 0-待处理
            todo.setCreateTime(LocalDateTime.now());
            return todo;
        }).collect(Collectors.toList());
        //批量保存
        oaApprovalTodoService.saveBatch(approvalTodoList);
    }
    /**
     * 构建审批申请主表数据
     */
    private OaApprovalApplications buildOaApprovalApplications(OaApprovalApplicationPurchaseDTO dto) {
        OaApprovalApplications applications = new OaApprovalApplications();
        applications.setApplicationCode(generateApplicationCode());
        applications.setApprovalId(dto.getApprovalId());
        applications.setApplicantUserId(dto.getApplicantUserId());
        applications.setApplicantName(dto.getApplicantName());
        applications.setDeptId(dto.getDeptId());
        applications.setDeptName(dto.getDeptName());
        applications.setApplicationDate(dto.getApplicationDate());
        applications.setApplicationReason(dto.getApplicationReason());
        applications.setAttachmentUrl(dto.getAttachmentUrl());
        applications.setDisabled(0); // 未删除
        applications.setApprovalStatus(ApprovalStatusEnum.PENDING.getCode());
        return applications;
    }

    /**
     * 构建采购申请详情数据
     */
    private OaApprovalApplicationPurchase buildOaApprovalApplicationPurchase(OaApprovalApplicationPurchaseDTO dto, Long applicationId) {
        OaApprovalApplicationPurchase purchase = new OaApprovalApplicationPurchase();
        purchase.setApprovalApplicationId(applicationId.intValue());
        // 使用事项标题，而非采购说明
        purchase.setTitle(dto.getTitle());
        // 表结构中无 application_date 字段，此处不再设置
        purchase.setAssetTypeId(dto.getAssetTypeId());
        purchase.setTotalAmount(dto.getTotalAmount());

        return purchase;
    }

    /**
     * 构建采购资产明细数据
     */
    private List<OaApprovalApplicationPurchaseItem> buildOaApprovalApplicationPurchaseItems(OaApprovalApplicationPurchaseDTO dto, Long applicationId) {
        return dto.getPurchaseItems().stream()
                .map(item -> {
                    OaApprovalApplicationPurchaseItem purchaseItem = new OaApprovalApplicationPurchaseItem();
                    purchaseItem.setApprovalApplicationId(applicationId.intValue());
                    purchaseItem.setAssetName(item.getAssetName());
                    purchaseItem.setAssetTypeId(item.getAssetTypeId());
                    purchaseItem.setSpec(item.getSpec());
                    purchaseItem.setUnit(item.getUnit());
                    purchaseItem.setQuantity(item.getQuantity());
                    purchaseItem.setPrice(item.getPrice());
                    purchaseItem.setTotalAmount(item.getTotalAmount());
                    return purchaseItem;
                })
                .collect(java.util.stream.Collectors.toList());
    }

    /**
     * 生成申请单号
     * 格式：CG + 年月日 + 3位序号
     */
    private String generateApplicationCode() {
        String dateStr = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        String prefix = "CG" + dateStr;
        
        // 查询当天已生成的申请单号数量
        Long count = oaApprovalApplicationsService.lambdaQuery()
                .like(OaApprovalApplications::getApplicationCode, prefix)
                .ge(OaApprovalApplications::getCreateTime, LocalDate.now().atStartOfDay())
                .lt(OaApprovalApplications::getCreateTime, LocalDate.now().plusDays(1).atStartOfDay())
                .count();
        
        // 生成3位序号，从001开始
        int sequence = (count != null ? count.intValue() : 0) + 1;
        String sequenceStr = String.format("%03d", sequence);
        
        return prefix + sequenceStr;
    }
}