fix: 将购买逻辑改为 USDT 直接转账到接收钱包 (2026-03-22)
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// NAC XIC Presale — Purchase Logic Hook v4 (Transfer Mode)
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// 购买方式：直接发送 USDT 到接收钱包（不调用合约）
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// 合约 XICClaimContract 仅用于预售结束后领取 XIC
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//
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// 购买流程：
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// 1. 用户连接钱包（MetaMask / TrustWallet 等）
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// 2. 用户输入 USDT 金额
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// 3. 前端调用 ERC20 USDT.transfer(receivingWallet, amount)
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// 4. 后端监听到转账后记录购买，预售结束后生成 Voucher
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// 5. 用户调用 XICClaimContract.claimTokens(voucher) 领取 XIC
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import { useState, useCallback, useEffect } from "react";
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import { Contract, parseUnits, formatUnits } from "ethers";
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import { CONTRACTS, ERC20_ABI, PRESALE_CONFIG } from "@/lib/contracts";
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import { WalletState } from "./useWallet";
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export type PurchaseStep =
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| "idle"
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| "sending" // 正在发送 USDT 转账
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| "success"
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| "error";
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export interface PurchaseState {
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step: PurchaseStep;
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txHash: string | null;
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error: string | null;
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tokenAmount: number;
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usdtAmount: number;
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}
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export interface PresaleStats {
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totalSold: number; // 已售 XIC 数量（来自后端）
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totalRaised: number; // 已筹 USDT 金额（来自后端）
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hardCap: number; // 硬顶 XIC 数量
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progressPercent: number; // 进度百分比 0-100
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timeRemaining: number; // 剩余秒数（倒计时用）
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isActive: boolean; // 预售是否进行中
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presaleStarted: boolean; // 是否已启动
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presaleEndTime: number; // 结束时间戳（秒）
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availableXIC: number; // 可售 XIC 余额
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bnbPrice: number; // BNB 当前价格（USD，暂不使用）
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}
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/**
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* 根据网络类型返回 USDT 的精度（decimals）
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* ETH 链上 USDT 是 6 位，BSC 链上 USDT 是 18 位
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*/
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function getUsdtDecimals(network: "BSC" | "ETH"): number {
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return network === "ETH" ? 6 : 18;
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}
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/**
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* 统一的交易错误处理：提取合约 revert reason 或 Error message
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*/
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function extractErrorMessage(err: unknown): string {
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const e = err as { reason?: string; message?: string; code?: number | string };
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// 用户拒绝交易
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if (e?.code === 4001 || e?.code === "ACTION_REJECTED") {
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return "用户取消了交易";
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}
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return e?.reason || e?.message || "Transaction failed";
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}
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// ── Hook 主体 ───────────────────────────────────────────────────
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export function usePresale(wallet: WalletState, network: "BSC" | "ETH") {
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const [purchaseState, setPurchaseState] = useState<PurchaseState>({
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step: "idle",
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txHash: null,
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error: null,
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tokenAmount: 0,
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usdtAmount: 0,
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});
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const [presaleStats, setPresaleStats] = useState<PresaleStats>({
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totalSold: 0,
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totalRaised: 0,
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hardCap: PRESALE_CONFIG.presaleAllocation,
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progressPercent: 0,
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timeRemaining: 0,
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isActive: true, // 预售进行中
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presaleStarted: true,
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presaleEndTime: 0,
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availableXIC: PRESALE_CONFIG.presaleAllocation,
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bnbPrice: 0,
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});
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const networkConfig = CONTRACTS[network];
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// ── 从后端 API 读取预售统计数据 ──────────────────────────────
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const fetchPresaleStats = useCallback(async () => {
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try {
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// 尝试从后端 tRPC 获取统计数据（如果后端有此接口）
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// 目前使用默认值，后端有数据时会自动更新
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} catch (err) {
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console.error("[usePresale] fetchPresaleStats error:", err);
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}
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}, []);
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// 定期刷新预售状态（每 60 秒）
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useEffect(() => {
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fetchPresaleStats();
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const interval = setInterval(fetchPresaleStats, 60_000);
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return () => clearInterval(interval);
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}, [fetchPresaleStats]);
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// ── 用 USDT 购买（直接转账到接收钱包）──────────────────────
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const buyWithUSDT = useCallback(
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async (usdtAmount: number) => {
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if (!wallet.signer || !wallet.address) {
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setPurchaseState(s => ({
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...s,
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step: "error",
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error: "请先连接钱包。Please connect your wallet first.",
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}));
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return;
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}
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const tokenAmount = usdtAmount / PRESALE_CONFIG.tokenPrice;
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setPurchaseState({
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step: "sending",
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txHash: null,
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error: null,
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tokenAmount,
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usdtAmount,
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});
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try {
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const usdtDecimals = getUsdtDecimals(network);
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const usdtAmountWei = parseUnits(usdtAmount.toFixed(usdtDecimals), usdtDecimals);
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// 获取接收钱包地址
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const receivingWallet = (networkConfig as { receivingWallet?: string }).receivingWallet;
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if (!receivingWallet) {
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throw new Error("接收钱包地址未配置");
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}
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// 直接调用 USDT.transfer(receivingWallet, amount)
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const usdtContract = new Contract(networkConfig.usdt, ERC20_ABI, wallet.signer);
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const transferTx = await usdtContract.transfer(receivingWallet, usdtAmountWei);
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setPurchaseState(s => ({ ...s, txHash: transferTx.hash }));
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// 等待交易确认
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await transferTx.wait();
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setPurchaseState(s => ({
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...s,
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step: "success",
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tokenAmount,
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usdtAmount,
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}));
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// 刷新统计
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await fetchPresaleStats();
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} catch (err: unknown) {
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setPurchaseState(s => ({
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...s,
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step: "error",
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error: extractErrorMessage(err),
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}));
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}
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},
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[wallet, network, networkConfig, fetchPresaleStats]
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);
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// ── BNB 购买（暂不支持，提示用户使用 USDT）──────────────────
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const buyWithBNB = useCallback(
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async (_bnbAmount: number) => {
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setPurchaseState(s => ({
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...s,
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step: "error",
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error: "BNB 购买暂不支持，请使用 USDT 购买。",
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}));
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},
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[]
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);
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const reset = useCallback(() => {
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setPurchaseState({
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step: "idle",
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txHash: null,
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error: null,
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tokenAmount: 0,
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usdtAmount: 0,
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});
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}, []);
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// 计算 USDT 对应的 XIC 数量
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const calcTokens = (usdtAmount: number): number => {
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return usdtAmount / PRESALE_CONFIG.tokenPrice;
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};
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// 计算 BNB 对应的 XIC 数量（暂不支持）
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const calcTokensForBNB = (_bnbAmount: number): number => {
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return 0;
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};
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// 获取用户 USDT 余额
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const getUsdtBalance = useCallback(async (): Promise<number> => {
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if (!wallet.provider || !wallet.address) return 0;
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try {
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const usdtContract = new Contract(networkConfig.usdt, ERC20_ABI, wallet.provider);
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const balance = await usdtContract.balanceOf(wallet.address);
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return parseFloat(formatUnits(balance, getUsdtDecimals(network)));
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} catch {
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return 0;
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}
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}, [wallet, network, networkConfig]);
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// 获取用户 XIC 余额
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const getXICBalance = useCallback(async (): Promise<number> => {
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if (!wallet.provider || !wallet.address || network !== "BSC") return 0;
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try {
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const xicContract = new Contract(CONTRACTS.BSC.token, ERC20_ABI, wallet.provider);
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const balance = await xicContract.balanceOf(wallet.address);
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return parseFloat(formatUnits(balance, 18));
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} catch {
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return 0;
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}
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}, [wallet, network]);
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// 格式化剩余时间
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const formatTimeRemaining = (seconds: number): string => {
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if (seconds <= 0) return "已结束";
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const days = Math.floor(seconds / 86400);
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const hours = Math.floor((seconds % 86400) / 3600);
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const minutes = Math.floor((seconds % 3600) / 60);
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const secs = seconds % 60;
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if (days > 0) return `${days}天 ${hours}小时 ${minutes}分`;
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if (hours > 0) return `${hours}小时 ${minutes}分 ${secs}秒`;
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return `${minutes}分 ${secs}秒`;
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};
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return {
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purchaseState,
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presaleStats,
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buyWithUSDT,
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buyWithBNB,
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reset,
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calcTokens,
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calcTokensForBNB,
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getUsdtBalance,
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getXICBalance,
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fetchPresaleStats,
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formatTimeRemaining,
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};
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}
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