package cn.iocoder.yudao.module.ums.service.application;

import cn.hutool.core.collection.CollUtil;
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.bpm.api.task.BpmProcessInstanceApi;
import cn.iocoder.yudao.module.bpm.api.task.dto.BpmProcessInstanceCreateReqDTO;
import cn.iocoder.yudao.module.bpm.dal.dataobject.definition.BpmCategoryDO;
import cn.iocoder.yudao.module.bpm.service.definition.BpmCategoryService;
import cn.iocoder.yudao.module.bpm.service.definition.BpmProcessDefinitionService;
import cn.iocoder.yudao.module.system.api.storage.StorageAttachmentApi;
import cn.iocoder.yudao.module.ums.controller.admin.application.vo.UmsApplicationPageReqVO;
import cn.iocoder.yudao.module.ums.controller.admin.application.vo.UmsApplicationSaveReqVO;
import cn.iocoder.yudao.module.ums.dal.dataobject.application.UmsApplicationDO;
import cn.iocoder.yudao.module.ums.dal.mysql.application.UmsApplicationMapper;
import cn.iocoder.yudao.module.ums.dal.redis.UmsNoRedisDAO;
import cn.iocoder.yudao.module.ums.enums.UmsApplicationStatusEnum;
import cn.iocoder.yudao.module.ums.service.member.UmsMemberService;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.flowable.engine.repository.ProcessDefinition;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

import java.util.*;
import java.util.stream.Collectors;

import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertList;
import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertSet;
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.ums.enums.ErrorCodeConstants.*;

@Service
@Validated
@Slf4j
public class UmsApplicationServiceImpl implements UmsApplicationService {

    private static final String APPLICATION_APPROVE_CATEGORY_CODE = "ums_membership_approve";
    public static final String APPLICATION_RECORD_TYPE = "ums_application";

    @Resource
    private UmsApplicationMapper applicationMapper;

    @Resource
    private UmsNoRedisDAO noRedisDAO;

    @Resource
    private StorageAttachmentApi storageAttachmentApi;

    @Resource
    private BpmProcessInstanceApi processInstanceApi;

    @Resource
    private BpmCategoryService bpmCategoryService;

    @Resource
    private BpmProcessDefinitionService bpmProcessDefinitionService;

    @Resource
    private UmsMemberService memberService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createApplication(UmsApplicationSaveReqVO createReqVO) {
        String no = noRedisDAO.generate(UmsNoRedisDAO.APPLICATION_NO_PREFIX);
        if (applicationMapper.selectByNo(no) != null) {
            throw exception(APPLICATION_NO_EXISTS);
        }

        UmsApplicationDO application = BeanUtils.toBean(createReqVO, UmsApplicationDO.class, in -> in
                .setNo(no)
                .setStatus(UmsApplicationStatusEnum.DRAFT.getStatus()));
        applicationMapper.insert(application);

        storageAttachmentApi.bindAttachments("file", APPLICATION_RECORD_TYPE,
                application.getId(), createReqVO.getBlobIds());

        return application.getId();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateApplication(UmsApplicationSaveReqVO updateReqVO) {
        UmsApplicationDO application = validateApplicationExists(updateReqVO.getId());
        Integer status = application.getStatus();
        if (!UmsApplicationStatusEnum.DRAFT.getStatus().equals(status)
                && !UmsApplicationStatusEnum.REJECTED.getStatus().equals(status)) {
            throw exception(APPLICATION_UPDATE_FAIL_NOT_DRAFT, application.getNo());
        }

        UmsApplicationDO updateObj = BeanUtils.toBean(updateReqVO, UmsApplicationDO.class);
        applicationMapper.updateById(updateObj);

        storageAttachmentApi.updateAttachments("file", APPLICATION_RECORD_TYPE,
                updateReqVO.getId(), updateReqVO.getBlobIds());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteApplication(Long id) {
        UmsApplicationDO application = validateApplicationExists(id);
        if (!UmsApplicationStatusEnum.DRAFT.getStatus().equals(application.getStatus())) {
            throw exception(APPLICATION_DELETE_FAIL_NOT_DRAFT, application.getNo());
        }

        applicationMapper.deleteById(id);
        storageAttachmentApi.deleteAttachmentsByRecord(APPLICATION_RECORD_TYPE, id);
    }

    @Override
    public UmsApplicationDO getApplication(Long id) {
        return applicationMapper.selectById(id);
    }

    @Override
    public PageResult<UmsApplicationDO> getApplicationPage(UmsApplicationPageReqVO pageReqVO) {
        return applicationMapper.selectPage(pageReqVO);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitApplication(Long id, String processDefinitionKey) {
        UmsApplicationDO application = validateApplicationExists(id);
        Integer status = application.getStatus();
        if (!UmsApplicationStatusEnum.DRAFT.getStatus().equals(status)
                && !UmsApplicationStatusEnum.REJECTED.getStatus().equals(status)) {
            throw exception(APPLICATION_SUBMIT_FAIL_STATUS);
        }

        String processInstanceId = processInstanceApi.createProcessInstance(getLoginUserId(),
                new BpmProcessInstanceCreateReqDTO()
                        .setProcessDefinitionKey(processDefinitionKey)
                        .setBusinessKey(String.valueOf(id)));

        applicationMapper.updateById(new UmsApplicationDO()
                .setId(id)
                .setStatus(UmsApplicationStatusEnum.APPROVING.getStatus())
                .setProcessInstanceId(processInstanceId));
    }

    @Override
    public List<Map<String, Object>> getApproveProcessDefinitionList() {
        validateApplicationApproveCategory();

        List<cn.iocoder.yudao.module.bpm.dal.dataobject.definition.BpmProcessDefinitionInfoDO> definitionInfoList =
                bpmProcessDefinitionService.getProcessDefinitionInfoListByCategory(APPLICATION_APPROVE_CATEGORY_CODE);
        if (CollUtil.isEmpty(definitionInfoList)) {
            return Collections.emptyList();
        }

        Map<String, ProcessDefinition> latestVersionMap = new HashMap<>();
        for (cn.iocoder.yudao.module.bpm.dal.dataobject.definition.BpmProcessDefinitionInfoDO info : definitionInfoList) {
            ProcessDefinition pd = bpmProcessDefinitionService.getProcessDefinition(info.getProcessDefinitionId());
            if (pd == null || pd.isSuspended()) {
                continue;
            }
            ProcessDefinition existing = latestVersionMap.get(pd.getKey());
            if (existing == null || pd.getVersion() > existing.getVersion()) {
                latestVersionMap.put(pd.getKey(), pd);
            }
        }

        List<Map<String, Object>> result = new ArrayList<>();
        for (ProcessDefinition pd : latestVersionMap.values()) {
            Map<String, Object> item = new HashMap<>();
            item.put("id", pd.getId());
            item.put("key", pd.getKey());
            item.put("name", pd.getName());
            result.add(item);
        }
        return result;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateApplicationAuditStatus(Long id, Integer bpmResult) {
        UmsApplicationDO application = validateApplicationExists(id);
        if (!UmsApplicationStatusEnum.APPROVING.getStatus().equals(application.getStatus())) {
            log.warn("[updateApplicationAuditStatus] 入会申请({}) 不处于审批中状态", id);
            return;
        }

        Integer newStatus = convertBpmResultToStatus(bpmResult);
        if (newStatus != null) {
            applicationMapper.updateById(new UmsApplicationDO()
                    .setId(id).setStatus(newStatus));
        }
    }

    // =================== 内部方法 ===================

    private UmsApplicationDO validateApplicationExists(Long id) {
        UmsApplicationDO application = applicationMapper.selectById(id);
        if (application == null) {
            throw exception(APPLICATION_NOT_EXISTS);
        }
        return application;
    }

    private void validateApplicationApproveCategory() {
        List<BpmCategoryDO> categories = bpmCategoryService.getCategoryListByCode(
                Collections.singletonList(APPLICATION_APPROVE_CATEGORY_CODE));
        if (CollUtil.isEmpty(categories)) {
            throw exception(APPLICATION_BPM_CATEGORY_NOT_EXISTS);
        }
    }

    private Integer convertBpmResultToStatus(Integer bpmResult) {
        if (cn.iocoder.yudao.module.bpm.enums.task.BpmTaskStatusEnum.APPROVE.getStatus().equals(bpmResult)) {
            return UmsApplicationStatusEnum.APPROVED.getStatus();
        } else if (cn.iocoder.yudao.module.bpm.enums.task.BpmTaskStatusEnum.REJECT.getStatus().equals(bpmResult)) {
            return UmsApplicationStatusEnum.REJECTED.getStatus();
        } else if (cn.iocoder.yudao.module.bpm.enums.task.BpmTaskStatusEnum.CANCEL.getStatus().equals(bpmResult)) {
            return UmsApplicationStatusEnum.DRAFT.getStatus();
        }
        return null;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void createMemberFromApplicationOnApproved(Long id) {
        UmsApplicationDO application = validateApplicationExists(id);
        if (!UmsApplicationStatusEnum.APPROVED.getStatus().equals(application.getStatus())) {
            log.warn("[createMemberFromApplicationOnApproved] 入会申请({}) 不是已通过状态，跳过建会员", id);
            return;
        }
        memberService.createMemberFromApplication(application);
    }

}