package cn.iocoder.yudao.module.aftersales.service.compensation;

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.aftersales.controller.admin.compensation.vo.AfterSaleCompensationPageReqVO;
import cn.iocoder.yudao.module.aftersales.controller.admin.compensation.vo.AfterSaleCompensationSaveReqVO;
import cn.iocoder.yudao.module.aftersales.dal.dataobject.compensation.AfterSaleCompensationDO;
import cn.iocoder.yudao.module.aftersales.dal.mysql.compensation.AfterSaleCompensationMapper;
import cn.iocoder.yudao.module.aftersales.enums.AfterSaleCompensationAuditStatusEnum;
import cn.iocoder.yudao.module.aftersales.enums.ErrorCodeConstants;
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.Set;

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

/**
 * 售后赔付/服务补偿单 Service 实现类
 */
@Service
@Validated
@Slf4j
public class AfterSaleCompensationServiceImpl implements AfterSaleCompensationService {

    /**
     * 赔付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 COMPENSATION_APPROVE_BIZ_TYPE = "compensation_approve";

    @Resource
    private AfterSaleCompensationMapper compensationMapper;
    @Resource
    private ApprovalConfigApi approvalConfigApi;
    @Resource
    private AdminUserApi adminUserApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createCompensation(AfterSaleCompensationSaveReqVO createReqVO) {
        String compensationNo = generateCompensationNo();
        if (compensationMapper.selectByCompensationNo(compensationNo) != null) {
            throw exception(ErrorCodeConstants.COMPENSATION_NO_EXISTS);
        }
        AfterSaleCompensationDO entity = BeanUtils.toBean(createReqVO, AfterSaleCompensationDO.class, req -> req
                .setCompensationNo(compensationNo)
                .setAuditStatus(AfterSaleCompensationAuditStatusEnum.DRAFT.getStatus()));
        compensationMapper.insert(entity);
        return entity.getId();
    }

    @Override
    public void updateCompensation(AfterSaleCompensationSaveReqVO updateReqVO) {
        AfterSaleCompensationDO exists = compensationMapper.selectById(updateReqVO.getId());
        if (exists == null) {
            throw exception(ErrorCodeConstants.COMPENSATION_NOT_EXISTS);
        }
        if (ObjUtil.notEqual(exists.getAuditStatus(), AfterSaleCompensationAuditStatusEnum.DRAFT.getStatus())) {
            throw exception(ErrorCodeConstants.COMPENSATION_DELETE_FAIL_NOT_DRAFT);
        }
        AfterSaleCompensationDO entity = BeanUtils.toBean(updateReqVO, AfterSaleCompensationDO.class, req -> req
                .setCompensationNo(exists.getCompensationNo())
                .setAuditStatus(exists.getAuditStatus()));
        compensationMapper.updateById(entity);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteCompensation(Long id) {
        AfterSaleCompensationDO exists = compensationMapper.selectById(id);
        if (exists == null) {
            throw exception(ErrorCodeConstants.COMPENSATION_NOT_EXISTS);
        }
        if (ObjUtil.notEqual(exists.getAuditStatus(), AfterSaleCompensationAuditStatusEnum.DRAFT.getStatus())) {
            throw exception(ErrorCodeConstants.COMPENSATION_DELETE_FAIL_NOT_DRAFT);
        }
        compensationMapper.deleteById(id);
    }

    @Override
    public AfterSaleCompensationDO getCompensation(Long id) {
        return compensationMapper.selectById(id);
    }

    @Override
    public PageResult<AfterSaleCompensationDO> getCompensationPage(AfterSaleCompensationPageReqVO pageReqVO) {
        return compensationMapper.selectPage(pageReqVO);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitCompensation(Long id) {
        // 1. 校验存在 + 可提交状态（未提交 / 审核不通过）
        AfterSaleCompensationDO compensation = validateCompensationExists(id);
        if (ObjUtil.notEqual(compensation.getAuditStatus(), AfterSaleCompensationAuditStatusEnum.DRAFT.getStatus())
                && ObjUtil.notEqual(compensation.getAuditStatus(), AfterSaleCompensationAuditStatusEnum.REJECT.getStatus())) {
            throw exception(ErrorCodeConstants.COMPENSATION_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(COMPENSATION_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
        compensationMapper.submitAndResetAuditInfo(id, AfterSaleCompensationAuditStatusEnum.PROCESS.getStatus());
    }

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

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void auditCompensation(Long id, Boolean pass, String reviewRemark) {
        // 1. 校验存在
        AfterSaleCompensationDO compensation = validateCompensationExists(id);
        // 2. 校验处于审批中状态
        if (ObjUtil.notEqual(compensation.getAuditStatus(), AfterSaleCompensationAuditStatusEnum.PROCESS.getStatus())) {
            throw exception(ErrorCodeConstants.COMPENSATION_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(COMPENSATION_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.COMPENSATION_AUDIT_REJECT_REASON_REQUIRED);
            }
            compensationMapper.auditCompensation(id, AfterSaleCompensationAuditStatusEnum.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
        compensationMapper.auditCompensation(id, AfterSaleCompensationAuditStatusEnum.APPROVE.getStatus(),
                userId, getUserNickname(userId), reviewRemark);
        // 6. 审核通过后的后置业务逻辑：当前赔付单审批通过后无自动生成下游单据的动作，
        //    支付状态（payStatus）待后续接入财务模块时再联动。
    }

    private AfterSaleCompensationDO validateCompensationExists(Long id) {
        AfterSaleCompensationDO compensation = compensationMapper.selectById(id);
        if (compensation == null) {
            throw exception(ErrorCodeConstants.COMPENSATION_NOT_EXISTS);
        }
        return compensation;
    }

    /**
     * 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 generateCompensationNo() {
        return "PS" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"))
                + RandomUtil.randomNumbers(4);
    }

}