package cn.iocoder.yudao.module.srm.service.apply;

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.framework.common.exception.util.ServiceExceptionUtil;
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.srm.controller.admin.apply.vo.SrmSupplierApplyPageReqVO;
import cn.iocoder.yudao.module.srm.controller.admin.apply.vo.SrmSupplierApplySaveReqVO;
import cn.iocoder.yudao.module.srm.dal.dataobject.SrmSupplierApplyDO;
import cn.iocoder.yudao.module.srm.dal.dataobject.SrmSupplierDO;
import cn.iocoder.yudao.module.srm.dal.mysql.SrmSupplierApplyMapper;
import cn.iocoder.yudao.module.srm.dal.mysql.SrmSupplierMapper;
import cn.iocoder.yudao.module.srm.enums.ErrorCodeConstants;
import cn.iocoder.yudao.module.srm.enums.SupplierApplyStatusEnum;
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.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * SRM 供应商准入申请 Service 实现类
 *
 * 接入协同办公(BPM)后,采购/质量/财务审核在协同办公流程中完成,
 * SRM 侧只负责发起流程并接收流程结束事件回写状态。
 */
@Service
@Validated
@Slf4j
public class SrmSupplierApplyServiceImpl implements SrmSupplierApplyService {

    /**
     * BPM 供应商准入审批分类编码
     */
    private static final String SUPPLIER_APPLY_APPROVE_CATEGORY_CODE = "supplier_apply_approve";

    @Resource
    private SrmSupplierApplyMapper supplierApplyMapper;

    @Resource
    private SrmSupplierMapper supplierMapper;

    @Resource
    private BpmProcessInstanceApi processInstanceApi;
    @Resource
    private BpmCategoryService bpmCategoryService;
    @Resource
    private BpmProcessDefinitionService bpmProcessDefinitionService;

    @Override
    public Long createApply(SrmSupplierApplySaveReqVO createReqVO) {
        // 校验：必须选择 SRM 供应商或手动填写供应商名称
        if (createReqVO.getSupplierId() != null) {
            SrmSupplierDO supplier = supplierMapper.selectById(createReqVO.getSupplierId());
            if (supplier == null) {
                throw ServiceExceptionUtil.exception(ErrorCodeConstants.SUPPLIER_NOT_EXISTS);
            }
        } else if (StrUtil.isBlank(createReqVO.getSupplierName())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_SUPPLIER_NAME_REQUIRED);
        }
        SrmSupplierApplyDO apply = BeanUtils.toBean(createReqVO, SrmSupplierApplyDO.class);
        apply.setApplyNo(generateApplyNo());
        apply.setApplyStatus(SupplierApplyStatusEnum.DRAFT.getCode());
        apply.setApplyTime(LocalDateTime.now());
        supplierApplyMapper.insert(apply);
        return apply.getId();
    }

    @Override
    public void updateApply(SrmSupplierApplySaveReqVO updateReqVO) {
        SrmSupplierApplyDO apply = validateApplyExists(updateReqVO.getId());
        // 仅待提交/已驳回可编辑
        if (!SupplierApplyStatusEnum.DRAFT.getCode().equals(apply.getApplyStatus())
                && !SupplierApplyStatusEnum.REJECTED.getCode().equals(apply.getApplyStatus())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_STATUS_NOT_DRAFT);
        }
        // 校验：必须选择 SRM 供应商或手动填写供应商名称
        if (updateReqVO.getSupplierId() != null) {
            SrmSupplierDO supplier = supplierMapper.selectById(updateReqVO.getSupplierId());
            if (supplier == null) {
                throw ServiceExceptionUtil.exception(ErrorCodeConstants.SUPPLIER_NOT_EXISTS);
            }
        } else if (StrUtil.isBlank(updateReqVO.getSupplierName())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_SUPPLIER_NAME_REQUIRED);
        }
        SrmSupplierApplyDO updateObj = BeanUtils.toBean(updateReqVO, SrmSupplierApplyDO.class);
        supplierApplyMapper.updateById(updateObj);
    }

    @Override
    public void deleteApply(Long id) {
        SrmSupplierApplyDO apply = validateApplyExists(id);
        // 仅待提交/已驳回可删除
        if (!SupplierApplyStatusEnum.DRAFT.getCode().equals(apply.getApplyStatus())
                && !SupplierApplyStatusEnum.REJECTED.getCode().equals(apply.getApplyStatus())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_STATUS_NOT_DRAFT);
        }
        supplierApplyMapper.deleteById(id);
    }

    @Override
    public SrmSupplierApplyDO getApply(Long id) {
        return supplierApplyMapper.selectById(id);
    }

    @Override
    public PageResult<SrmSupplierApplyDO> getApplyPage(SrmSupplierApplyPageReqVO pageReqVO) {
        return supplierApplyMapper.selectPage(pageReqVO);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitApply(Long id, String processDefinitionKey, Long userId) {
        // 1. 校验存在 + 待提交/已驳回状态
        SrmSupplierApplyDO apply = validateApplyExists(id);
        if (!SupplierApplyStatusEnum.DRAFT.getCode().equals(apply.getApplyStatus())
                && !SupplierApplyStatusEnum.REJECTED.getCode().equals(apply.getApplyStatus())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_STATUS_NOT_DRAFT);
        }
        // 2. 创建 BPM 流程实例（采购审核→质量审核→财务审核，流程与审批人在协同办公配置）
        String processInstanceId = processInstanceApi.createProcessInstance(userId,
                new BpmProcessInstanceCreateReqDTO()
                        .setProcessDefinitionKey(processDefinitionKey)
                        .setBusinessKey(String.valueOf(id)));
        // 3. 更新申请状态为审批中，回存流程实例编号
        supplierApplyMapper.updateById(new SrmSupplierApplyDO()
                .setId(id)
                .setApplyStatus(SupplierApplyStatusEnum.PROCESS.getCode())
                .setProcessInstanceId(processInstanceId));
    }

    @Override
    public List<Map<String, Object>> getSupplierApplyApproveProcessDefinitionList() {
        // 1. 校验分类和流程定义是否存在
        validateSupplierApplyApproveCategoryAndProcessDefinition();

        // 2. 获取分类下的流程定义信息
        List<BpmProcessDefinitionInfoDO> definitionInfoList = bpmProcessDefinitionService
                .getProcessDefinitionInfoListByCategory(SUPPLIER_APPLY_APPROVE_CATEGORY_CODE);
        if (CollUtil.isEmpty(definitionInfoList)) {
            return Collections.emptyList();
        }

        // 3. 遍历获取流程定义详情，过滤激活状态，保留最新版本
        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);
            }
        }

        // 4. 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());
            result.add(item);
        }
        return result;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateSupplierApplyAuditStatus(Long id, Integer bpmResult) {
        // 1. 校验存在
        SrmSupplierApplyDO apply = validateApplyExists(id);
        if (!SupplierApplyStatusEnum.PROCESS.getCode().equals(apply.getApplyStatus())) {
            log.warn("[updateSupplierApplyAuditStatus] 准入申请({}) 不处于审批中状态", id);
            return;
        }

        // 2. 根据审批结果更新状态
        Integer newStatus = convertBpmResultToStatus(bpmResult);
        if (newStatus != null) {
            supplierApplyMapper.updateById(new SrmSupplierApplyDO()
                    .setId(id).setApplyStatus(newStatus));
        }

        // 3. 审批通过：自动创建/关联供应商档案
        if (SupplierApplyStatusEnum.APPROVED.getCode().equals(newStatus)) {
            approve(id);
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void ensureSupplierApproved(Long supplierId) {
        if (supplierId == null) {
            return;
        }
        // 校验供应商存在
        SrmSupplierDO supplier = supplierMapper.selectById(supplierId);
        if (supplier == null) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.SUPPLIER_NOT_EXISTS);
        }
        // 已准入则无需处理
        if (supplierApplyMapper.existsApprovedBySupplierId(supplierId)) {
            return;
        }
        // 自动创建准入申请并直接置为已通过（定标自动准入，不走协同办公）
        SrmSupplierApplyDO apply = new SrmSupplierApplyDO();
        apply.setApplyNo(generateApplyNo());
        apply.setSupplierId(supplierId);
        apply.setSupplierName(supplier.getName());
        apply.setSupplierType(supplier.getType());
        apply.setCompanyNature(supplier.getCompanyNature());
        apply.setRegisteredCapital(supplier.getRegisteredCapital());
        apply.setBusinessLicenseNo(supplier.getBusinessLicenseNo());
        apply.setTaxNo(supplier.getTaxNo());
        apply.setAddress(supplier.getAddress());
        apply.setBankName(supplier.getBankName());
        apply.setBankAccount(supplier.getBankAccount());
        apply.setContactName(supplier.getContactName());
        apply.setContactMobile(supplier.getContactMobile());
        apply.setContactEmail(supplier.getContactEmail());
        apply.setRemark("中标生成采购订单时自动准入并通过");
        apply.setApplyStatus(SupplierApplyStatusEnum.APPROVED.getCode());
        apply.setApplyTime(LocalDateTime.now());
        supplierApplyMapper.insert(apply);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void approve(Long id) {
        SrmSupplierApplyDO apply = validateApplyExists(id);
        if (!SupplierApplyStatusEnum.APPROVED.getCode().equals(apply.getApplyStatus())) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_STATUS_NOT_PENDING);
        }
        // 如果已关联 SRM 供应商，不需要重复创建
        if (apply.getSupplierId() == null) {
            SrmSupplierDO supplier = new SrmSupplierDO();
            supplier.setName(apply.getSupplierName());
            supplier.setCompanyNature(apply.getCompanyNature());
            supplier.setRegisteredCapital(apply.getRegisteredCapital());
            supplier.setBusinessLicenseNo(apply.getBusinessLicenseNo());
            supplier.setTaxNo(apply.getTaxNo());
            supplier.setAddress(apply.getAddress());
            supplier.setBankName(apply.getBankName());
            supplier.setBankAccount(apply.getBankAccount());
            supplier.setContactName(apply.getContactName());
            supplier.setContactMobile(apply.getContactMobile());
            supplier.setContactEmail(apply.getContactEmail());
            supplier.setRemark(apply.getRemark());
            supplier.setStatus(0);
            supplierMapper.insert(supplier);

            apply.setSupplierId(supplier.getId());
        }
        supplierApplyMapper.updateById(apply);
    }

    // ========== 校验方法 ==========

    private SrmSupplierApplyDO validateApplyExists(Long id) {
        SrmSupplierApplyDO apply = supplierApplyMapper.selectById(id);
        if (apply == null) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_NOT_EXISTS);
        }
        return apply;
    }

    /**
     * 校验供应商准入审批分类存在
     */
    private void validateSupplierApplyApproveCategoryAndProcessDefinition() {
        List<BpmCategoryDO> categories = bpmCategoryService.getCategoryListByCode(
                Collections.singletonList(SUPPLIER_APPLY_APPROVE_CATEGORY_CODE));
        if (CollUtil.isEmpty(categories)) {
            throw ServiceExceptionUtil.exception(ErrorCodeConstants.APPLY_BPM_CATEGORY_NOT_EXISTS);
        }
    }

    /**
     * 转换 BPM 审批结果为业务状态
     */
    private Integer convertBpmResultToStatus(Integer bpmResult) {
        if (BpmTaskStatusEnum.APPROVE.getStatus().equals(bpmResult)) {
            return SupplierApplyStatusEnum.APPROVED.getCode();
        } else if (BpmTaskStatusEnum.REJECT.getStatus().equals(bpmResult)) {
            return SupplierApplyStatusEnum.REJECTED.getCode();
        } else if (BpmTaskStatusEnum.CANCEL.getStatus().equals(bpmResult)) {
            return SupplierApplyStatusEnum.CANCEL.getCode();
        }
        return null;
    }

    /**
     * 生成申请编号
     */
    private String generateApplyNo() {
        String prefix = "AP";
        String date = java.time.LocalDate.now().format(java.time.format.DateTimeFormatter.ofPattern("yyyyMM"));
        int seq = (int) (Math.random() * 9000) + 1000;
        return prefix + date + String.format("%04d", seq);
    }

}