// NAC XIC Token Presale — Contract Configuration
// Design: Dark Cyberpunk / Quantum Finance
// Colors: Amber Gold #f0b429, Quantum Blue #00d4ff, Deep Black #0a0a0f

// ============================================================
// CONTRACT ADDRESSES
// ============================================================
export const CONTRACTS = {
  // BSC Mainnet (Chain ID: 56)
  BSC: {
    chainId: 56,
    chainName: "BNB Smart Chain",
    rpcUrl: "https://bsc-dataseed1.binance.org/",
    explorerUrl: "https://bscscan.com",
    nativeCurrency: { name: "BNB", symbol: "BNB", decimals: 18 },
    presale: "0x5953c025dA734e710886916F2d739A3A78f8bbc4", // XICPresale v2 — 购买即时发放
    token: "0x59FF34dD59680a7125782b1f6df2A86ed46F5A24",
    usdt: "0x55d398326f99059fF775485246999027B3197955",
  },
  // Ethereum Mainnet (Chain ID: 1)
  ETH: {
    chainId: 1,
    chainName: "Ethereum",
    rpcUrl: "https://eth.llamarpc.com",
    explorerUrl: "https://etherscan.io",
    nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
    presale: "0x43DAb577f3279e11D311E7d628C6201d893A9Aa3",
    token: "", // XIC not yet on ETH
    usdt: "0xdAC17F958D2ee523a2206206994597C13D831ec7",
  },
  // TRON (TRC20) — Manual transfer
  TRON: {
    chainId: 0, // Not EVM
    chainName: "TRON",
    explorerUrl: "https://tronscan.org",
    presale: "", // TRC20 uses manual transfer
    token: "",
    usdt: "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t",
    // Receiving wallet for TRC20 USDT
    receivingWallet: "TWc2ugYBFN5aSoimAh4qGt9oMyket6NYZp",
  },
} as const;

// ============================================================
// PRESALE PARAMETERS
// ============================================================
export const PRESALE_CONFIG = {
  tokenPrice: 0.02,           // $0.02 per XIC
  tokenSymbol: "XIC",
  tokenName: "New AssetChain Token",
  tokenDecimals: 18,
  minPurchaseUSDT: 0,          // No minimum purchase limit
  maxPurchaseUSDT: 50000,       // Max $50,000 USDT per purchase
  totalSupply: 100_000_000_000, // 100 billion XIC
  presaleAllocation: 2_500_000_000, // 2.5 billion for presale (25亿)
  // TRC20 memo format
  trc20Memo: "XIC_PRESALE",
};

// ============================================================
// PRESALE CONTRACT ABI (BSC & ETH — same interface)
// ============================================================
export const PRESALE_ABI = [
  // Read functions
  {
    "inputs": [],
    "name": "tokenPrice",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "totalTokensSold",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "totalRaised",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "presaleActive",
    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "hardCap",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [{ "internalType": "address", "name": "user", "type": "address" }],
    "name": "userPurchases",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  // Write functions
  {
    "inputs": [{ "internalType": "uint256", "name": "usdtAmount", "type": "uint256" }],
    "name": "buyTokensWithUSDT",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "buyTokens",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  // Events
  {
    "anonymous": false,
    "inputs": [
      { "indexed": true, "internalType": "address", "name": "buyer", "type": "address" },
      { "indexed": false, "internalType": "uint256", "name": "usdtAmount", "type": "uint256" },
      { "indexed": false, "internalType": "uint256", "name": "tokenAmount", "type": "uint256" }
    ],
    "name": "TokensPurchased",
    "type": "event"
  }
] as const;

// ============================================================
// ERC20 USDT ABI (minimal — approve + allowance + balanceOf)
// ============================================================
export const ERC20_ABI = [
  {
    "inputs": [
      { "internalType": "address", "name": "spender", "type": "address" },
      { "internalType": "uint256", "name": "amount", "type": "uint256" }
    ],
    "name": "approve",
    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      { "internalType": "address", "name": "owner", "type": "address" },
      { "internalType": "address", "name": "spender", "type": "address" }
    ],
    "name": "allowance",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [{ "internalType": "address", "name": "account", "type": "address" }],
    "name": "balanceOf",
    "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "decimals",
    "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }],
    "stateMutability": "view",
    "type": "function"
  }
] as const;

// ============================================================
// NETWORK SWITCH HELPER
// ============================================================
export async function switchToNetwork(chainId: number): Promise<void> {
  if (!window.ethereum) throw new Error("No wallet detected");
  const hexChainId = "0x" + chainId.toString(16);
  try {
    await window.ethereum.request({
      method: "wallet_switchEthereumChain",
      params: [{ chainId: hexChainId }],
    });
  } catch (err: unknown) {
    // Chain not added yet — add it
    if ((err as { code?: number }).code === 4902) {
      const network = Object.values(CONTRACTS).find(n => n.chainId === chainId);
      if (!network || !("rpcUrl" in network)) throw new Error("Unknown network");
      await window.ethereum.request({
        method: "wallet_addEthereumChain",
        params: [{
          chainId: hexChainId,
          chainName: network.chainName,
          rpcUrls: [(network as { rpcUrl: string }).rpcUrl],
          nativeCurrency: (network as { nativeCurrency: { name: string; symbol: string; decimals: number } }).nativeCurrency,
          blockExplorerUrls: [network.explorerUrl],
        }],
      });
    } else {
      throw err;
    }
  }
}

// ============================================================
// FORMAT HELPERS
// ============================================================
export function formatNumber(n: number, decimals = 2): string {
  if (n >= 1_000_000_000) return (n / 1_000_000_000).toFixed(decimals) + "B";
  if (n >= 1_000_000) return (n / 1_000_000).toFixed(decimals) + "M";
  if (n >= 1_000) return (n / 1_000).toFixed(decimals) + "K";
  return n.toFixed(decimals);
}

export function shortenAddress(addr: string): string {
  if (!addr) return "";
  return addr.slice(0, 6) + "..." + addr.slice(-4);
}

// Declare window.ethereum for TypeScript
declare global {
  interface Window {
    ethereum?: {
      request: (args: { method: string; params?: unknown[] }) => Promise<unknown>;
      on: (event: string, handler: (...args: unknown[]) => void) => void;
      removeListener: (event: string, handler: (...args: unknown[]) => void) => void;
      isMetaMask?: boolean;
    };
  }
}