package cn.iocoder.yudao.module.hrm.service.approval;

import cn.hutool.core.util.StrUtil;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.hrm.controller.admin.approval.vo.HrmTransferApplicationPageReqVO;
import cn.iocoder.yudao.module.hrm.controller.admin.approval.vo.HrmTransferApplicationRespVO;
import cn.iocoder.yudao.module.hrm.controller.admin.approval.vo.HrmTransferApplicationSaveReqVO;
import cn.iocoder.yudao.module.hrm.dal.dataobject.approval.HrmTransferApplicationDO;
import cn.iocoder.yudao.module.hrm.dal.dataobject.employee.HrmEmployeeDO;
import cn.iocoder.yudao.module.hrm.dal.mysql.approval.HrmTransferApplicationMapper;
import cn.iocoder.yudao.module.hrm.dal.mysql.employee.HrmEmployeeMapper;
import cn.iocoder.yudao.module.hrm.dal.redis.HrmNoRedisDAO;
import cn.iocoder.yudao.module.hrm.enums.HrmAuditStatusEnum;
import cn.iocoder.yudao.module.hrm.enums.HrmTransferTypeEnum;
import cn.iocoder.yudao.module.system.api.approval.ApprovalConfigApi;
import cn.iocoder.yudao.module.system.api.dept.DeptApi;
import cn.iocoder.yudao.module.system.api.dept.PostApi;
import cn.iocoder.yudao.module.system.api.storage.StorageAttachmentApi;
import cn.iocoder.yudao.module.system.api.dept.dto.DeptRespDTO;
import cn.iocoder.yudao.module.system.api.dept.dto.PostRespDTO;
import cn.iocoder.yudao.module.system.api.user.AdminUserApi;
import cn.iocoder.yudao.module.system.api.user.dto.AdminUserRespDTO;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import cn.iocoder.yudao.framework.security.core.util.SecurityFrameworkUtils;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.security.core.util.SecurityFrameworkUtils.getLoginUserId;
import static cn.iocoder.yudao.module.hrm.enums.ErrorCodeConstants.*;

/**
 * 调岗申请 Service 实现类
 *
 * @author 超级管理员
 */
@Service
@Validated
@Slf4j
public class HrmTransferApplicationServiceImpl implements HrmTransferApplicationService {

    /**
     * 调岗申请审批的业务类型编码
     *
     * 与 system_approval_config.biz_type 对应，审批人在「系统管理 - 审批配置」中维护。
     */
    private static final String TRANSFER_APPROVE_BIZ_TYPE = "hrm_transfer_approve";

    @Resource
    private HrmTransferApplicationMapper transferApplicationMapper;
    @Resource
    private HrmNoRedisDAO noRedisDAO;
    @Resource
    private DeptApi deptApi;
    @Resource
    private PostApi postApi;
    @Resource
    private AdminUserApi adminUserApi;
    @Resource
    private StorageAttachmentApi storageAttachmentApi;
    @Resource
    private ApprovalConfigApi approvalConfigApi;
    @Resource
    private HrmEmployeeMapper employeeMapper;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createTransferApplication(HrmTransferApplicationSaveReqVO createReqVO) {
        // 1. 校验目标部门与原部门不能相同
        if (Objects.equals(createReqVO.getTargetDeptId(), createReqVO.getCurrentDeptId())) {
            throw exception(TRANSFER_APPLICATION_SAME_DEPT);
        }
        // 2. 校验目标岗位与原岗位不能相同
        if (Objects.equals(createReqVO.getTargetPostId(), createReqVO.getCurrentPostId())) {
            throw exception(TRANSFER_APPLICATION_SAME_POST);
        }
        // 3. 生成申请单号
        String no = generateUniqueNo();
        // 4. 设置申请人信息
        Long userId = createReqVO.getUserId();
        if (userId == null) {
            userId = getCurrentUserId();
        }
        AdminUserRespDTO user = adminUserApi.getUser(userId);
        if (user == null) {
            userId = getCurrentUserId();
        }
        // 5. 插入
        HrmTransferApplicationDO application = BeanUtils.toBean(createReqVO, HrmTransferApplicationDO.class);
        application.setNo(no);
        application.setUserId(userId);
        application.setStatus(HrmAuditStatusEnum.DRAFT.getStatus());
        transferApplicationMapper.insert(application);
        storageAttachmentApi.bindAttachments("file", "hrm_transfer_application",
                application.getId(), createReqVO.getBlobIds());
        return application.getId();
    }

    private Long getCurrentUserId() {
        return SecurityFrameworkUtils.getLoginUserId();
    }

    private String generateUniqueNo() {
        String no = noRedisDAO.generateTransferApplicationNo();
        if (transferApplicationMapper.selectByNo(no) != null) {
            return generateUniqueNo();
        }
        return no;
    }

    @Override
    public void updateTransferApplication(HrmTransferApplicationSaveReqVO updateReqVO) {
        HrmTransferApplicationDO application = validateTransferApplicationExists(updateReqVO.getId());
        if (!Objects.equals(application.getStatus(), HrmAuditStatusEnum.DRAFT.getStatus())
                && !Objects.equals(application.getStatus(), HrmAuditStatusEnum.PROCESS.getStatus())) {
            throw exception(TRANSFER_APPLICATION_UPDATE_FAIL_NOT_DRAFT);
        }
        if (Objects.equals(updateReqVO.getTargetDeptId(), updateReqVO.getCurrentDeptId())) {
            throw exception(TRANSFER_APPLICATION_SAME_DEPT);
        }
        if (Objects.equals(updateReqVO.getTargetPostId(), updateReqVO.getCurrentPostId())) {
            throw exception(TRANSFER_APPLICATION_SAME_POST);
        }
        HrmTransferApplicationDO updateObj = BeanUtils.toBean(updateReqVO, HrmTransferApplicationDO.class);
        transferApplicationMapper.updateById(updateObj);
        storageAttachmentApi.updateAttachments("file", "hrm_transfer_application", updateReqVO.getId(), updateReqVO.getBlobIds());
    }

    @Override
    public void deleteTransferApplication(Long id) {
        HrmTransferApplicationDO application = validateTransferApplicationExists(id);
        if (!Objects.equals(application.getStatus(), HrmAuditStatusEnum.DRAFT.getStatus())) {
            throw exception(TRANSFER_APPLICATION_UPDATE_FAIL_NOT_DRAFT);
        }
        storageAttachmentApi.deleteAttachmentsByRecord("hrm_transfer_application", id);
        transferApplicationMapper.deleteById(id);
    }

    private HrmTransferApplicationDO validateTransferApplicationExists(Long id) {
        HrmTransferApplicationDO application = transferApplicationMapper.selectById(id);
        if (application == null) {
            throw exception(TRANSFER_APPLICATION_NOT_EXISTS);
        }
        return application;
    }

    @Override
    public HrmTransferApplicationDO getTransferApplication(Long id) {
        return transferApplicationMapper.selectById(id);
    }

    @Override
    public HrmTransferApplicationRespVO getTransferApplicationDetail(Long id) {
        HrmTransferApplicationDO application = getTransferApplication(id);
        if (application == null) {
            return null;
        }
        HrmTransferApplicationRespVO respVO = BeanUtils.toBean(application, HrmTransferApplicationRespVO.class);
        if (application.getUserId() != null) {
            AdminUserRespDTO user = adminUserApi.getUser(application.getUserId());
            if (user != null) {
                respVO.setUserName(user.getNickname());
            }
        }
        fillDeptNames(respVO, application);
        fillPostNames(respVO, application);
        respVO.setTransferTypeName(HrmTransferTypeEnum.getNameByStatus(application.getTransferType()));
        respVO.setStatusName(HrmAuditStatusEnum.getNameByStatus(application.getStatus()));
        respVO.setAttachmentList(storageAttachmentApi.listAttachments("hrm_transfer_application", id));
        return respVO;
    }

    private void fillDeptNames(HrmTransferApplicationRespVO respVO, HrmTransferApplicationDO application) {
        Set<Long> deptIds = Stream.of(application.getCurrentDeptId(), application.getTargetDeptId())
                .filter(Objects::nonNull).collect(Collectors.toSet());
        Map<Long, DeptRespDTO> deptMap = deptApi.getDeptMap(deptIds);
        if (application.getCurrentDeptId() != null && deptMap.containsKey(application.getCurrentDeptId())) {
            respVO.setCurrentDeptName(deptMap.get(application.getCurrentDeptId()).getName());
        }
        if (application.getTargetDeptId() != null && deptMap.containsKey(application.getTargetDeptId())) {
            respVO.setTargetDeptName(deptMap.get(application.getTargetDeptId()).getName());
        }
    }

    private void fillPostNames(HrmTransferApplicationRespVO respVO, HrmTransferApplicationDO application) {
        Set<Long> postIds = Stream.of(application.getCurrentPostId(), application.getTargetPostId())
                .filter(Objects::nonNull).collect(Collectors.toSet());
        Map<Long, PostRespDTO> postMap = postApi.getPostMap(postIds);
        if (application.getCurrentPostId() != null && postMap.containsKey(application.getCurrentPostId())) {
            respVO.setCurrentPostName(postMap.get(application.getCurrentPostId()).getName());
        }
        if (application.getTargetPostId() != null && postMap.containsKey(application.getTargetPostId())) {
            respVO.setTargetPostName(postMap.get(application.getTargetPostId()).getName());
        }
    }

    @Override
    public PageResult<HrmTransferApplicationRespVO> getTransferApplicationPage(HrmTransferApplicationPageReqVO pageReqVO) {
        PageResult<HrmTransferApplicationDO> pageResult = transferApplicationMapper.selectPage(pageReqVO);
        if (pageResult.getList().isEmpty()) {
            return new PageResult<>(Collections.emptyList(), pageResult.getTotal());
        }
        Set<Long> userIds = pageResult.getList().stream()
                .map(HrmTransferApplicationDO::getUserId)
                .filter(Objects::nonNull)
                .collect(Collectors.toSet());
        Map<Long, AdminUserRespDTO> userMap = adminUserApi.getUserMap(userIds);
        Set<Long> deptIds = pageResult.getList().stream()
                .flatMap(app -> Stream.of(app.getCurrentDeptId(), app.getTargetDeptId()))
                .filter(Objects::nonNull)
                .collect(Collectors.toSet());
        Map<Long, DeptRespDTO> deptMap = deptApi.getDeptMap(deptIds);
        Set<Long> postIds = pageResult.getList().stream()
                .flatMap(app -> Stream.of(app.getCurrentPostId(), app.getTargetPostId()))
                .filter(Objects::nonNull)
                .collect(Collectors.toSet());
        Map<Long, PostRespDTO> postMap = postApi.getPostMap(postIds);
        List<HrmTransferApplicationRespVO> list = pageResult.getList().stream().map(app -> {
            HrmTransferApplicationRespVO vo = BeanUtils.toBean(app, HrmTransferApplicationRespVO.class);
            if (app.getUserId() != null && userMap.containsKey(app.getUserId())) {
                vo.setUserName(userMap.get(app.getUserId()).getNickname());
            }
            if (app.getCurrentDeptId() != null && deptMap.containsKey(app.getCurrentDeptId())) {
                vo.setCurrentDeptName(deptMap.get(app.getCurrentDeptId()).getName());
            }
            if (app.getTargetDeptId() != null && deptMap.containsKey(app.getTargetDeptId())) {
                vo.setTargetDeptName(deptMap.get(app.getTargetDeptId()).getName());
            }
            if (app.getCurrentPostId() != null && postMap.containsKey(app.getCurrentPostId())) {
                vo.setCurrentPostName(postMap.get(app.getCurrentPostId()).getName());
            }
            if (app.getTargetPostId() != null && postMap.containsKey(app.getTargetPostId())) {
                vo.setTargetPostName(postMap.get(app.getTargetPostId()).getName());
            }
            vo.setTransferTypeName(HrmTransferTypeEnum.getNameByStatus(app.getTransferType()));
            vo.setStatusName(HrmAuditStatusEnum.getNameByStatus(app.getStatus()));
            return vo;
        }).collect(Collectors.toList());
        return new PageResult<>(list, pageResult.getTotal());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitTransferApplication(Long id) {
        // 1. 校验存在 + 可提交状态（草稿 / 审核不通过）
        HrmTransferApplicationDO application = validateTransferApplicationExists(id);
        if (!Objects.equals(application.getStatus(), HrmAuditStatusEnum.DRAFT.getStatus())
                && !Objects.equals(application.getStatus(), HrmAuditStatusEnum.REJECT.getStatus())) {
            throw exception(TRANSFER_APPLICATION_SUBMIT_FAIL_NOT_EDITABLE);
        }

        // 2. 校验审批配置已启用且配置了有效审批人（未配置时抛出带明确提示的业务异常）
        approvalConfigApi.validateApprovalEnabledAndGetApprovers(TRANSFER_APPROVE_BIZ_TYPE);

        // 3. 状态置为审批中，并清空上一轮审核结果，避免残留「审核不通过」的原因
        transferApplicationMapper.submitAndResetAuditInfo(id, HrmAuditStatusEnum.PROCESS.getStatus());
    }

    @Override
    public Set<Long> getTransferApplicationApproverUserIds() {
        return approvalConfigApi.getApproverUserIds(TRANSFER_APPROVE_BIZ_TYPE);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void auditTransferApplication(Long id, Boolean pass, String reviewRemark) {
        // 1. 校验存在
        HrmTransferApplicationDO application = validateTransferApplicationExists(id);
        // 2. 校验处于审批中状态
        if (!Objects.equals(application.getStatus(), HrmAuditStatusEnum.PROCESS.getStatus())) {
            throw exception(TRANSFER_APPLICATION_AUDIT_FAIL_NOT_PROCESS);
        }
        // 3. 校验当前登录用户是该业务类型的审批人（或签：任一人均可审核）
        Long userId = getLoginUserId();
        approvalConfigApi.validateApprover(TRANSFER_APPROVE_BIZ_TYPE, userId);
        // 4. 审核不通过：必须填写原因，状态置为审核不通过，退回提交人修改后可重新提交
        if (!Boolean.TRUE.equals(pass)) {
            if (StrUtil.isBlank(reviewRemark)) {
                throw exception(TRANSFER_APPLICATION_AUDIT_REJECT_REASON_REQUIRED);
            }
            transferApplicationMapper.auditTransferApplication(id, HrmAuditStatusEnum.REJECT.getStatus(),
                    userId, getUserNickname(userId), reviewRemark);
            return;
        }
        // 5. 审核通过：记录审核人与审核意见，状态置为审核通过
        transferApplicationMapper.auditTransferApplication(id, HrmAuditStatusEnum.APPROVE.getStatus(),
                userId, getUserNickname(userId), reviewRemark);

        // 6. 审核通过后置业务逻辑：回写员工主档（部门 = 目标部门，岗位 = 目标岗位）
        writeBackEmployee(application);
    }

    /**
     * 审核通过后回写员工主档
     *
     * @param application 调岗申请
     */
    private void writeBackEmployee(HrmTransferApplicationDO application) {
        HrmEmployeeDO employee = employeeMapper.selectByUserId(application.getUserId());
        if (employee == null) {
            log.warn("[writeBackEmployee] 调岗申请({}) 用户({}) 未找到员工档案，跳过回写", application.getId(), application.getUserId());
            return;
        }
        employeeMapper.updateById(HrmEmployeeDO.builder()
                .id(employee.getId())
                .deptId(application.getTargetDeptId())
                .postId(application.getTargetPostId())
                .build());
    }

    /**
     * 获取用户昵称
     *
     * @param userId 用户编号
     * @return 昵称，用户不存在时返回 null
     */
    private String getUserNickname(Long userId) {
        if (userId == null) {
            return null;
        }
        AdminUserRespDTO user = adminUserApi.getUser(userId);
        return user == null ? null : user.getNickname();
    }

}