package cn.iocoder.yudao.module.erp.service.purchase;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.ObjectUtil;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.invoice.ErpPurchaseInvoicePageReqVO;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.invoice.ErpPurchaseInvoiceSaveReqVO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseInvoiceDO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseOrderDO;
import cn.iocoder.yudao.module.erp.dal.mysql.finance.ErpFinancePaymentMapper;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpPurchaseInvoiceMapper;
import cn.iocoder.yudao.module.erp.dal.redis.no.ErpNoRedisDAO;
import cn.iocoder.yudao.module.system.api.storage.StorageAttachmentApi;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.getSumValue;
import static cn.iocoder.yudao.module.erp.enums.ErrorCodeConstants.*;

/**
 * ERP 采购来票 Service 实现类
 *
 * @author 超级管理员
 */
@Service
@Validated
public class ErpPurchaseInvoiceServiceImpl implements ErpPurchaseInvoiceService {

    /**
     * 来票附件的业务记录类型，对应 {@link cn.iocoder.yudao.module.system.enums.storage.StorageRecordTypeEnum#ERP_PURCHASE_INVOICE}
     */
    public static final String PURCHASE_INVOICE_RECORD_TYPE = "erp_purchase_invoice";

    @Resource
    private ErpPurchaseInvoiceMapper invoiceMapper;

    @Resource
    private ErpFinancePaymentMapper financePaymentMapper;

    @Resource
    private ErpNoRedisDAO noRedisDAO;

    @Resource
    private ErpPurchaseOrderService purchaseOrderService;

    @Resource
    private StorageAttachmentApi storageAttachmentApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createPurchaseInvoice(ErpPurchaseInvoiceSaveReqVO createReqVO) {
        // 1.1 校验关联数据存在
        validateRelationDataExists(createReqVO);
        // 1.2 校验可开票金额超过上限
        validatePurchaseInvoicePriceExceedsLimit(createReqVO);
        // 1.3 生成来票编号
        String no = noRedisDAO.generate(ErpNoRedisDAO.PURCHASE_INVOICE_NO_PREFIX);
        if (invoiceMapper.selectByNo(no) != null) {
            throw exception(PURCHASE_INVOICE_NO_EXISTS);
        }

        // 2.1 插入来票（创建后即为有效状态，无需审核）
        ErpPurchaseInvoiceDO invoice = BeanUtils.toBean(createReqVO, ErpPurchaseInvoiceDO.class).setNo(no);
        invoiceMapper.insert(invoice);

        // 2.2 绑定发票附件
        if (CollUtil.isNotEmpty(createReqVO.getBlobIds())) {
            storageAttachmentApi.bindAttachments("file", PURCHASE_INVOICE_RECORD_TYPE, invoice.getId(), createReqVO.getBlobIds());
        }
        return invoice.getId();
    }

    private void validateRelationDataExists(ErpPurchaseInvoiceSaveReqVO reqVO) {
        // 校验采购订单，必须审核通过
        ErpPurchaseOrderDO purchaseOrder = purchaseOrderService.validatePurchaseOrder(reqVO.getPurchaseOrderId());
        // 校验供应商与采购订单一致（防御脏数据：来票必须属于该采购订单的供应商）
        if (reqVO.getSupplierId() != null && ObjectUtil.notEqual(purchaseOrder.getSupplierId(), reqVO.getSupplierId())) {
            throw exception(PURCHASE_INVOICE_CREATE_FAIL_SUPPLIER_MISMATCH);
        }
        reqVO.setSupplierId(purchaseOrder.getSupplierId()); // 供应商以采购订单为准
    }

    private void validatePurchaseInvoicePriceExceedsLimit(ErpPurchaseInvoiceSaveReqVO reqVO) {
        // 1. 计算剩余可开票金额，不包括 reqVO 自身（所有有效来票都占用额度，防止累计来票超过采购订单金额）
        ErpPurchaseOrderDO purchaseOrder = purchaseOrderService.getPurchaseOrder(reqVO.getPurchaseOrderId());
        List<ErpPurchaseInvoiceDO> invoices = invoiceMapper.selectListByOrderId(reqVO.getPurchaseOrderId());
        if (reqVO.getId() != null) {
            invoices.removeIf(invoice -> ObjectUtil.equal(invoice.getId(), reqVO.getId()));
        }
        BigDecimal remainPrice = purchaseOrder.getTotalPrice().subtract(
                getSumValue(invoices, ErpPurchaseInvoiceDO::getPrice, BigDecimal::add, BigDecimal.ZERO));
        // 2. 校验金额是否超过
        if (reqVO.getPrice().compareTo(remainPrice) > 0) {
            throw exception(PURCHASE_INVOICE_CREATE_FAIL_PRICE_EXCEEDS_LIMIT, remainPrice);
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updatePurchaseInvoice(ErpPurchaseInvoiceSaveReqVO updateReqVO) {
        Assert.notNull(updateReqVO.getId(), "来票编号不能为空");
        // 1.1 校验存在
        validatePurchaseInvoiceExists(updateReqVO.getId());
        // 1.2 校验关联数据 + 可开票金额
        validateRelationDataExists(updateReqVO);
        validatePurchaseInvoicePriceExceedsLimit(updateReqVO);

        // 2. 更新来票
        ErpPurchaseInvoiceDO updateObj = BeanUtils.toBean(updateReqVO, ErpPurchaseInvoiceDO.class);
        invoiceMapper.updateById(updateObj);

        // 3. 增量更新发票附件
        storageAttachmentApi.updateAttachments("file", PURCHASE_INVOICE_RECORD_TYPE, updateReqVO.getId(), updateReqVO.getBlobIds());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deletePurchaseInvoice(Long id) {
        // 1.1 校验存在
        validatePurchaseInvoiceExists(id);
        // 1.2 已有有效付款单关联的来票，不允许删除（保持来票与付款的关联完整性）
        Map<Long, BigDecimal> paidMap = financePaymentMapper.selectPaymentPriceMapByInvoiceId(List.of(id));
        if (paidMap.getOrDefault(id, BigDecimal.ZERO).compareTo(BigDecimal.ZERO) > 0) {
            throw exception(PURCHASE_INVOICE_DELETE_FAIL_HAS_PAYMENT);
        }

        // 2.1 删除发票附件
        storageAttachmentApi.deleteAttachmentsByRecord(PURCHASE_INVOICE_RECORD_TYPE, id);
        // 2.2 删除来票
        invoiceMapper.deleteById(id);
    }

    private ErpPurchaseInvoiceDO validatePurchaseInvoiceExists(Long id) {
        ErpPurchaseInvoiceDO invoice = invoiceMapper.selectById(id);
        if (invoice == null) {
            throw exception(PURCHASE_INVOICE_NOT_EXISTS);
        }
        return invoice;
    }

    @Override
    public ErpPurchaseInvoiceDO getPurchaseInvoice(Long id) {
        return invoiceMapper.selectById(id);
    }

    @Override
    public List<ErpPurchaseInvoiceDO> getPurchaseInvoiceList(Collection<Long> ids) {
        if (CollUtil.isEmpty(ids)) {
            return List.of();
        }
        return invoiceMapper.selectByIds(ids);
    }

    @Override
    public PageResult<ErpPurchaseInvoiceDO> getPurchaseInvoicePage(ErpPurchaseInvoicePageReqVO pageReqVO) {
        return invoiceMapper.selectPage(pageReqVO);
    }

    @Override
    public List<ErpPurchaseInvoiceDO> getPurchaseInvoiceListByOrderId(Long orderId) {
        return invoiceMapper.selectListByOrderId(orderId);
    }

    @Override
    public List<ErpPurchaseInvoiceDO> getPurchaseInvoiceListBySupplierId(Long supplierId) {
        return invoiceMapper.selectListBySupplierId(supplierId);
    }

}