// Ledger Weaver - Five Elements Collision Engine
import { CustomsDeclaration, PurchaseOrder } from '@axon/types';

interface CollisionResult {
  matched: boolean;
  discrepancies: Discrepancy[];
  invoiceInstruction?: InvoiceInstruction;
}

async function fiveElementCollision(
  declaration: CustomsDeclaration,
  order: PurchaseOrder
): Promise<CollisionResult> {
  const checks = [
    // 品名校验 - 允许同义词映射
    checkProductName(declaration.productName, order.productName),
    // 规格校验 - 精确匹配
    checkSpecification(declaration.specs, order.specs),
    // 数量校验 - 允许 ±0.1% 误差
    checkQuantity(declaration.qty, order.qty, 0.001),
    // 币种校验 - 必须完全一致
    checkCurrency(declaration.currency, order.currency),
    // 汇率校验 - 取申报日央行中间价
    checkExchangeRate(declaration.rate, getCentralBankRate(declaration.date))
  ];
  
  const results = await Promise.all(checks);
  const discrepancies = results.filter(r => !r.passed);
  
  if (discrepancies.length === 0) {
    return {
      matched: true,
      discrepancies: [],
      invoiceInstruction: generateInvoiceInstruction(declaration, order)
    };
  }
  
  // 差异率 > 0.1% 触发冻结
  return {
    matched: false,
    discrepancies,
    // 冻结异常单据，推送补正提示
  };
}