package cn.iocoder.yudao.module.crm.service.refund;

import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.RandomUtil;
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.crm.controller.admin.refund.vo.CrmRefundPageReqVO;
import cn.iocoder.yudao.module.crm.controller.admin.refund.vo.CrmRefundRespVO;
import cn.iocoder.yudao.module.crm.controller.admin.refund.vo.CrmRefundSaveReqVO;
import cn.iocoder.yudao.module.crm.dal.dataobject.customer.CrmCustomerDO;
import cn.iocoder.yudao.module.crm.dal.dataobject.refund.CrmRefundDO;
import cn.iocoder.yudao.module.crm.dal.mysql.customer.CrmCustomerMapper;
import cn.iocoder.yudao.module.crm.dal.mysql.refund.CrmRefundMapper;
import cn.iocoder.yudao.module.crm.enums.ErrorCodeConstants;
import cn.iocoder.yudao.module.crm.enums.common.CrmAuditStatusEnum;
import cn.iocoder.yudao.module.system.api.approval.ApprovalConfigApi;
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.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Set;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.security.core.util.SecurityFrameworkUtils.getLoginUserId;

@Service
@Validated
@Slf4j
public class CrmRefundServiceImpl implements CrmRefundService {

    /**
     * CRM 退费单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 REFUND_APPROVE_BIZ_TYPE = "refund_approve";

    @Resource
    private CrmRefundMapper refundMapper;
    @Resource
    private CrmCustomerMapper customerMapper;
    @Resource
    private AdminUserApi adminUserApi;
    @Resource
    private ApprovalConfigApi approvalConfigApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createRefund(CrmRefundSaveReqVO createReqVO) {
        if (StrUtil.isBlank(createReqVO.getRefundNo())) {
            createReqVO.setRefundNo(generateRefundNo());
        } else if (refundMapper.selectByRefundNo(createReqVO.getRefundNo()) != null) {
            throw exception(ErrorCodeConstants.CRM_REFUND_NO_DUPLICATE);
        }
        CrmCustomerDO customer = customerMapper.selectById(createReqVO.getCustomerId());
        if (customer == null) {
            throw exception(ErrorCodeConstants.CUSTOMER_NOT_EXISTS);
        }
        if (StrUtil.isBlank(createReqVO.getCustomerName())) {
            createReqVO.setCustomerName(customer.getName());
        }
        if (createReqVO.getApplyTime() == null) {
            createReqVO.setApplyTime(LocalDateTime.now());
        }
        createReqVO.setAuditStatus(CrmAuditStatusEnum.DRAFT.getStatus()); // 默认为未提交状态
        CrmRefundDO entity = BeanUtils.toBean(createReqVO, CrmRefundDO.class);
        refundMapper.insert(entity);
        return entity.getId();
    }

    @Override
    public void updateRefund(CrmRefundSaveReqVO updateReqVO) {
        // 1. 校验存在 + 审核通过的退费单不允许修改
        CrmRefundDO refund = validateRefundExists(updateReqVO.getId());
        if (ObjUtil.equal(refund.getAuditStatus(), CrmAuditStatusEnum.APPROVE.getStatus())) {
            throw exception(ErrorCodeConstants.CRM_REFUND_UPDATE_FAIL_APPROVE);
        }
        // 2. 更新退费单
        CrmRefundDO entity = BeanUtils.toBean(updateReqVO, CrmRefundDO.class);
        entity.setAuditStatus(null); // 审批状态只能由提交/审核变更
        refundMapper.updateById(entity);
    }

    @Override
    public void deleteRefund(Long id) {
        // 校验存在 + 审核通过的退费单不允许删除
        CrmRefundDO refund = validateRefundExists(id);
        if (ObjUtil.equal(refund.getAuditStatus(), CrmAuditStatusEnum.APPROVE.getStatus())) {
            throw exception(ErrorCodeConstants.CRM_REFUND_DELETE_FAIL_APPROVE);
        }
        refundMapper.deleteById(id);
    }

    @Override
    public CrmRefundRespVO getRefund(Long id) {
        CrmRefundDO entity = refundMapper.selectById(id);
        return entity == null ? null : BeanUtils.toBean(entity, CrmRefundRespVO.class);
    }

    @Override
    public PageResult<CrmRefundRespVO> getRefundPage(CrmRefundPageReqVO pageReqVO) {
        return BeanUtils.toBean(refundMapper.selectPage(pageReqVO), CrmRefundRespVO.class);
    }

    @Override
    public List<CrmRefundRespVO> getRefundList(CrmRefundPageReqVO reqVO) {
        return BeanUtils.toBean(refundMapper.selectList(reqVO), CrmRefundRespVO.class);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitRefund(Long id) {
        // 1. 校验存在 + 可提交状态（未提交 / 审核不通过）
        CrmRefundDO refund = validateRefundExists(id);
        if (ObjUtil.notEqual(refund.getAuditStatus(), CrmAuditStatusEnum.DRAFT.getStatus())
                && ObjUtil.notEqual(refund.getAuditStatus(), CrmAuditStatusEnum.REJECT.getStatus())) {
            throw exception(ErrorCodeConstants.CRM_REFUND_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(REFUND_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
        refundMapper.submitAndResetAuditInfo(id, CrmAuditStatusEnum.PROCESS.getStatus());
    }

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

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void auditRefund(Long id, Boolean pass, String reviewRemark) {
        // 1. 校验存在
        CrmRefundDO refund = validateRefundExists(id);
        // 2. 校验处于审批中状态
        if (ObjUtil.notEqual(refund.getAuditStatus(), CrmAuditStatusEnum.PROCESS.getStatus())) {
            throw exception(ErrorCodeConstants.CRM_REFUND_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(REFUND_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(ErrorCodeConstants.CRM_REFUND_AUDIT_REJECT_REASON_REQUIRED);
            }
            refundMapper.auditRefund(id, CrmAuditStatusEnum.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
        refundMapper.auditRefund(id, CrmAuditStatusEnum.APPROVE.getStatus(),
                userId, getUserNickname(userId), reviewRemark);
    }

    private CrmRefundDO validateRefundExists(Long id) {
        CrmRefundDO refund = refundMapper.selectById(id);
        if (refund == null) {
            throw exception(ErrorCodeConstants.CRM_REFUND_NOT_EXISTS);
        }
        return refund;
    }

    /**
     * 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();
    }

    private String generateRefundNo() {
        return "RF" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"))
                + RandomUtil.randomNumbers(4);
    }

}