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

import cn.hutool.core.collection.CollUtil;
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.dal.dataobject.definition.BpmProcessDefinitionInfoDO;
import cn.iocoder.yudao.module.bpm.enums.task.BpmTaskStatusEnum;
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.user.AdminUserApi;
import cn.iocoder.yudao.module.system.api.user.dto.AdminUserRespDTO;
import cn.iocoder.yudao.module.vehicle.controller.admin.application.vo.VehicleApplicationPageReqVO;
import cn.iocoder.yudao.module.vehicle.controller.admin.application.vo.VehicleApplicationSaveReqVO;
import cn.iocoder.yudao.module.vehicle.dal.dataobject.application.VehicleApplicationDO;
import cn.iocoder.yudao.module.vehicle.dal.mysql.application.VehicleApplicationMapper;
import cn.iocoder.yudao.module.vehicle.dal.redis.VehicleNoRedisDAO;
import cn.iocoder.yudao.module.vehicle.enums.VehicleApplicationStatusEnum;
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.time.LocalDateTime;
import java.util.*;

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.vehicle.enums.ErrorCodeConstants.*;

/**
 * 用车申请 Service 实现类
 */
@Service
@Validated
@Slf4j
public class VehicleApplicationServiceImpl implements VehicleApplicationService {

    /** 用车审批 BPM 分类编码 */
    public static final String VEHICLE_APPROVE_CATEGORY_CODE = "vehicle_application_approve";

    @Resource
    private VehicleApplicationMapper applicationMapper;

    @Resource
    private VehicleNoRedisDAO noRedisDAO;

    @Resource
    private BpmProcessInstanceApi processInstanceApi;

    @Resource
    private BpmCategoryService bpmCategoryService;

    @Resource
    private BpmProcessDefinitionService bpmProcessDefinitionService;

    @Resource
    private AdminUserApi adminUserApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createApplication(VehicleApplicationSaveReqVO reqVO) {
        validateUseTime(reqVO);
        Long userId = getLoginUserId();
        AdminUserRespDTO user = userId != null ? adminUserApi.getUser(userId) : null;
        VehicleApplicationDO application = BeanUtils.toBean(reqVO, VehicleApplicationDO.class, in -> in
                .setNo(noRedisDAO.generate(VehicleNoRedisDAO.APPLICATION_NO_PREFIX))
                .setApplicantId(userId)
                .setApplicantName(user != null ? user.getNickname() : "未知用户")
                .setStatus(VehicleApplicationStatusEnum.DRAFT.getStatus()));
        applicationMapper.insert(application);
        return application.getId();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateApplication(VehicleApplicationSaveReqVO reqVO) {
        VehicleApplicationDO old = validateApplicationExists(reqVO.getId());
        if (!VehicleApplicationStatusEnum.DRAFT.getStatus().equals(old.getStatus())
                && !VehicleApplicationStatusEnum.REJECTED.getStatus().equals(old.getStatus())) {
            throw exception(VEHICLE_APPLICATION_UPDATE_FAIL, old.getNo(),
                    VehicleApplicationStatusEnum.nameOf(old.getStatus()));
        }
        validateUseTime(reqVO);
        VehicleApplicationDO updateObj = BeanUtils.toBean(reqVO, VehicleApplicationDO.class);
        applicationMapper.updateById(updateObj);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteApplication(Long id) {
        VehicleApplicationDO application = validateApplicationExists(id);
        if (!VehicleApplicationStatusEnum.DRAFT.getStatus().equals(application.getStatus())) {
            throw exception(VEHICLE_APPLICATION_DELETE_FAIL, application.getNo(),
                    VehicleApplicationStatusEnum.nameOf(application.getStatus()));
        }
        applicationMapper.deleteById(id);
    }

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

    @Override
    public PageResult<VehicleApplicationDO> getApplicationPage(VehicleApplicationPageReqVO reqVO) {
        return applicationMapper.selectPage(reqVO);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitApplication(Long id, String processDefinitionKey) {
        VehicleApplicationDO application = validateApplicationExists(id);
        if (!VehicleApplicationStatusEnum.DRAFT.getStatus().equals(application.getStatus())
                && !VehicleApplicationStatusEnum.REJECTED.getStatus().equals(application.getStatus())) {
            throw exception(VEHICLE_APPLICATION_SUBMIT_FAIL, application.getNo(),
                    VehicleApplicationStatusEnum.nameOf(application.getStatus()));
        }
        String processInstanceId = processInstanceApi.createProcessInstance(getLoginUserId(),
                new BpmProcessInstanceCreateReqDTO()
                        .setProcessDefinitionKey(processDefinitionKey)
                        .setBusinessKey(String.valueOf(id)));
        applicationMapper.updateById(new VehicleApplicationDO()
                .setId(id)
                .setStatus(VehicleApplicationStatusEnum.APPROVING.getStatus())
                .setProcessInstanceId(processInstanceId));
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateApplicationAuditStatus(Long id, Integer bpmResult) {
        VehicleApplicationDO application = validateApplicationExists(id);
        if (!VehicleApplicationStatusEnum.APPROVING.getStatus().equals(application.getStatus())) {
            log.warn("[updateApplicationAuditStatus] 用车申请({}) 不处于审批中状态", id);
            return;
        }
        Integer newStatus = convertBpmResultToStatus(bpmResult);
        if (newStatus == null) {
            return;
        }
        VehicleApplicationDO updateObj = new VehicleApplicationDO().setId(id).setStatus(newStatus);
        if (VehicleApplicationStatusEnum.APPROVED.getStatus().equals(newStatus)) {
            updateObj.setApproveTime(LocalDateTime.now());
        }
        applicationMapper.updateById(updateObj);
    }

    @Override
    public List<Map<String, Object>> getApproveProcessDefinitionList() {
        validateVehicleApproveCategory();
        List<BpmProcessDefinitionInfoDO> definitionInfoList =
                bpmProcessDefinitionService.getProcessDefinitionInfoListByCategory(VEHICLE_APPROVE_CATEGORY_CODE);
        if (CollUtil.isEmpty(definitionInfoList)) {
            return Collections.emptyList();
        }
        Map<String, ProcessDefinition> latestVersionMap = new HashMap<>();
        for (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;
    }

    private void validateVehicleApproveCategory() {
        List<BpmCategoryDO> categories = bpmCategoryService.getCategoryListByCode(
                Collections.singletonList(VEHICLE_APPROVE_CATEGORY_CODE));
        if (CollUtil.isEmpty(categories)) {
            throw exception(VEHICLE_APPLICATION_BPM_CATEGORY_NOT_EXISTS);
        }
    }

    private void validateUseTime(VehicleApplicationSaveReqVO reqVO) {
        if (reqVO.getUseStartTime() != null && reqVO.getUseEndTime() != null
                && !reqVO.getUseEndTime().isAfter(reqVO.getUseStartTime())) {
            throw exception(VEHICLE_APPLICATION_TIME_INVALID);
        }
    }

    private VehicleApplicationDO validateApplicationExists(Long id) {
        VehicleApplicationDO application = id != null ? applicationMapper.selectById(id) : null;
        if (application == null) {
            throw exception(VEHICLE_APPLICATION_NOT_EXISTS);
        }
        return application;
    }

    private Integer convertBpmResultToStatus(Integer bpmResult) {
        if (BpmTaskStatusEnum.APPROVE.getStatus().equals(bpmResult)) {
            return VehicleApplicationStatusEnum.APPROVED.getStatus();
        }
        if (BpmTaskStatusEnum.REJECT.getStatus().equals(bpmResult)) {
            return VehicleApplicationStatusEnum.REJECTED.getStatus();
        }
        if (BpmTaskStatusEnum.CANCEL.getStatus().equals(bpmResult)) {
            return VehicleApplicationStatusEnum.DRAFT.getStatus();
        }
        return null;
    }

}