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.mapper.OaApprovalTodoMapper;
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.OaApprovalTodoService;
import lombok.RequiredArgsConstructor;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * <p>
 * 审批待办表 服务实现类
 * </p>
 *
 * @author WuGuanFengYue
 * @since 2025-09-15
 */
@Service
@RequiredArgsConstructor
public class OaApprovalTodoServiceImpl extends ServiceImpl<OaApprovalTodoMapper, OaApprovalTodo> implements OaApprovalTodoService {

    private final ISysUserService sysUserService;
    private final ISysDeptService sysDeptService;

    /**
     * 创建审批待办（公共实现）
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void createApprovalTodos(Integer applicationId, String applicationCode, OaApprovalFlowNode flowNode, Integer deptId) {
        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(Integer 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(Integer 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(Integer 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(Integer 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
        this.saveBatch(approvalTodoList);
    }
}