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

import cn.hutool.core.collection.CollUtil;
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.cancellation.vo.CrmCancellationAuditReqVO;
import cn.iocoder.yudao.module.crm.controller.admin.cancellation.vo.CrmCancellationPageReqVO;
import cn.iocoder.yudao.module.crm.controller.admin.cancellation.vo.CrmCancellationRespVO;
import cn.iocoder.yudao.module.crm.controller.admin.cancellation.vo.CrmCancellationSaveReqVO;
import cn.iocoder.yudao.module.crm.dal.dataobject.cancellation.CrmCancellationDO;
import cn.iocoder.yudao.module.crm.dal.dataobject.customer.CrmCustomerDO;
import cn.iocoder.yudao.module.crm.dal.mysql.cancellation.CrmCancellationMapper;
import cn.iocoder.yudao.module.crm.dal.mysql.customer.CrmCustomerMapper;
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.BpmProcessDefinitionInfoDO;
import cn.iocoder.yudao.module.bpm.service.definition.BpmCategoryService;
import cn.iocoder.yudao.module.bpm.service.definition.BpmProcessDefinitionService;
import cn.iocoder.yudao.module.crm.enums.ErrorCodeConstants;
import cn.iocoder.yudao.module.crm.enums.common.CrmAuditStatusEnum;
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.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertSet;
import static cn.iocoder.yudao.module.crm.util.CrmAuditStatusUtils.convertBpmResultToAuditStatus;

@Service
@Validated
@Slf4j
public class CrmCancellationServiceImpl implements CrmCancellationService {

    private static final Integer AUDIT_DRAFT = 0;

    /**
     * BPM 销户审批分类编码
     */
    private static final String CANCELLATION_APPROVE_CATEGORY_CODE = "cancellation_approve";

    @Resource
    private CrmCancellationMapper cancellationMapper;
    @Resource
    private CrmCustomerMapper customerMapper;
    @Resource
    private BpmProcessInstanceApi bpmProcessInstanceApi;
    @Resource
    private BpmCategoryService bpmCategoryService;
    @Resource
    private BpmProcessDefinitionService bpmProcessDefinitionService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createCancellation(CrmCancellationSaveReqVO createReqVO) {
        if (StrUtil.isBlank(createReqVO.getCancellationNo())) {
            createReqVO.setCancellationNo(generateCancellationNo());
        } else if (cancellationMapper.selectByCancellationNo(createReqVO.getCancellationNo()) != null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_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());
        }
        if (createReqVO.getAuditStatus() == null) {
            createReqVO.setAuditStatus(AUDIT_DRAFT);
        }
        CrmCancellationDO entity = BeanUtils.toBean(createReqVO, CrmCancellationDO.class);
        cancellationMapper.insert(entity);
        return entity.getId();
    }

    @Override
    public void updateCancellation(CrmCancellationSaveReqVO updateReqVO) {
        CrmCancellationDO exists = cancellationMapper.selectById(updateReqVO.getId());
        if (exists == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_NOT_EXISTS);
        }
        CrmCancellationDO entity = BeanUtils.toBean(updateReqVO, CrmCancellationDO.class);
        cancellationMapper.updateById(entity);
    }

    @Override
    public void deleteCancellation(Long id) {
        CrmCancellationDO exists = cancellationMapper.selectById(id);
        if (exists == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_NOT_EXISTS);
        }
        cancellationMapper.deleteById(id);
    }

    @Override
    public CrmCancellationRespVO getCancellation(Long id) {
        CrmCancellationDO entity = cancellationMapper.selectById(id);
        return entity == null ? null : BeanUtils.toBean(entity, CrmCancellationRespVO.class);
    }

    @Override
    public PageResult<CrmCancellationRespVO> getCancellationPage(CrmCancellationPageReqVO pageReqVO) {
        return BeanUtils.toBean(cancellationMapper.selectPage(pageReqVO), CrmCancellationRespVO.class);
    }

    @Override
    public List<CrmCancellationRespVO> getCancellationList(CrmCancellationPageReqVO reqVO) {
        return BeanUtils.toBean(cancellationMapper.selectList(reqVO), CrmCancellationRespVO.class);
    }

    @Override
    public void auditCancellation(CrmCancellationAuditReqVO auditReqVO) {
        CrmCancellationDO exists = cancellationMapper.selectById(auditReqVO.getId());
        if (exists == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_NOT_EXISTS);
        }
        CrmCancellationDO update = new CrmCancellationDO();
        update.setId(exists.getId());
        update.setAuditStatus(auditReqVO.getAuditStatus());
        if (StrUtil.isNotBlank(auditReqVO.getRemark())) {
            update.setRemark(auditReqVO.getRemark());
        }
        cancellationMapper.updateById(update);
    }

    @Override
    public void submitCancellation(Long id, String processDefinitionKey, Long userId) {
        // 1. 校验销户申请是否在草稿状态
        CrmCancellationDO cancellation = cancellationMapper.selectById(id);
        if (cancellation == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_NOT_EXISTS);
        }
        if (ObjUtil.notEqual(cancellation.getAuditStatus(), CrmAuditStatusEnum.DRAFT.getStatus())) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_SUBMIT_FAIL_NOT_DRAFT);
        }

        // 2. 校验销户审批分类和流程定义是否存在，且传入的流程定义处于激活状态
        validateCancellationApproveCategoryAndProcessDefinition();
        ProcessDefinition processDefinition = bpmProcessDefinitionService.getActiveProcessDefinition(processDefinitionKey);
        if (processDefinition == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_BPM_PROCESS_DEFINITION_NOT_EXISTS);
        }

        // 3. 创建销户审批流程实例
        String processInstanceId = bpmProcessInstanceApi.createProcessInstance(userId,
                new BpmProcessInstanceCreateReqDTO().setProcessDefinitionKey(processDefinitionKey)
                        .setBusinessKey(String.valueOf(id)));

        // 4. 更新销户申请流程编号与审批状态
        cancellationMapper.updateById(new CrmCancellationDO().setId(id).setProcessInstanceId(processInstanceId)
                .setAuditStatus(CrmAuditStatusEnum.PROCESS.getStatus()));
    }

    @Override
    public void updateCancellationAuditStatus(Long id, Integer bpmResult) {
        // 1.1 校验销户申请是否存在
        CrmCancellationDO cancellation = cancellationMapper.selectById(id);
        if (cancellation == null) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_NOT_EXISTS);
        }
        // 1.2 只有审批中，可以更新审批结果
        if (ObjUtil.notEqual(cancellation.getAuditStatus(), CrmAuditStatusEnum.PROCESS.getStatus())) {
            log.error("[updateCancellationAuditStatus][cancellation({}) 不处于审批中，无法更新审批结果({})]",
                    cancellation.getId(), bpmResult);
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_UPDATE_AUDIT_STATUS_FAIL_NOT_PROCESS);
        }

        // 2. 更新销户申请审批结果
        Integer auditStatus = convertBpmResultToAuditStatus(bpmResult);
        cancellationMapper.updateById(new CrmCancellationDO().setId(id).setAuditStatus(auditStatus));
    }

    @Override
    public List<Map<String, Object>> getCancellationApproveProcessDefinitionList() {
        // 1. 校验销户审批分类和流程定义是否存在
        validateCancellationApproveCategoryAndProcessDefinition();

        // 2. 获取分类下的流程定义信息
        List<BpmProcessDefinitionInfoDO> definitionInfoList = bpmProcessDefinitionService
                .getProcessDefinitionInfoListByCategory(CANCELLATION_APPROVE_CATEGORY_CODE);

        // 3. 获取流程定义详情
        Set<String> processDefinitionIds = convertSet(definitionInfoList, BpmProcessDefinitionInfoDO::getProcessDefinitionId);
        List<ProcessDefinition> processDefinitions = bpmProcessDefinitionService.getProcessDefinitionList(processDefinitionIds);

        // 4. 过滤：只保留激活状态，且相同 key 只保留最新版本
        Map<String, ProcessDefinition> latestVersionMap = new HashMap<>();
        for (ProcessDefinition pd : processDefinitions) {
            if (pd.isSuspended()) {
                continue;
            }
            ProcessDefinition existing = latestVersionMap.get(pd.getKey());
            if (existing == null || pd.getVersion() > existing.getVersion()) {
                latestVersionMap.put(pd.getKey(), pd);
            }
        }

        // 5. 返回流程定义列表
        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());
            item.put("version", pd.getVersion());
            result.add(item);
        }
        return result;
    }

    /**
     * 校验 BPM 销户审批分类和流程定义是否存在
     */
    private void validateCancellationApproveCategoryAndProcessDefinition() {
        // 1. 校验分类是否存在
        Map<String, ?> categoryMap = bpmCategoryService.getCategoryMap(Collections.singletonList(CANCELLATION_APPROVE_CATEGORY_CODE));
        if (!categoryMap.containsKey(CANCELLATION_APPROVE_CATEGORY_CODE)) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_BPM_PROCESS_DEFINITION_NOT_EXISTS);
        }

        // 2. 校验分类下是否有可用的流程定义
        List<BpmProcessDefinitionInfoDO> definitionInfoList = bpmProcessDefinitionService
                .getProcessDefinitionInfoListByCategory(CANCELLATION_APPROVE_CATEGORY_CODE);
        if (CollUtil.isEmpty(definitionInfoList)) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_BPM_PROCESS_DEFINITION_NOT_EXISTS);
        }

        // 3. 校验是否有激活状态的流程定义
        Set<String> processDefinitionIds = convertSet(definitionInfoList, BpmProcessDefinitionInfoDO::getProcessDefinitionId);
        List<ProcessDefinition> processDefinitions = bpmProcessDefinitionService.getProcessDefinitionList(processDefinitionIds);
        boolean hasActiveDefinition = processDefinitions.stream().anyMatch(pd -> !pd.isSuspended());
        if (!hasActiveDefinition) {
            throw exception(ErrorCodeConstants.CRM_CANCELLATION_BPM_PROCESS_DEFINITION_NOT_EXISTS);
        }
    }

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

}