// Generic single-address read-only imported adapter for account-model
// chains. One config-driven runtime handles ETH-family, Tron, and Solana
// balance polling — every chain differs only in the RPC verb and the
// JSON path to the balance number.
//
// The adapter mirrors the public shape every Aegis chain runtime exposes
// (snapshot, refresh, plan, signAndBroadcast, dispose) so mountWallet
// stays chain-agnostic. planSend/send throw a "read-only" error until
// M.1b delivers the sign path per chain.

module.exports = function makeGenericImportedAdapter() {

  const CHAIN_CFGS = {
    eth: {
      ticker: "ETH", decimals: 18,
      networks: {
        mainnet:  { id: "mainnet",  label: "Mainnet",  rpc: "https://eth.llamarpc.com",       explorerAddr: "https://etherscan.io/address/", explorerTx: "https://etherscan.io/tx/" },
        sepolia:  { id: "sepolia",  label: "Sepolia",  rpc: "https://ethereum-sepolia-rpc.publicnode.com", explorerAddr: "https://sepolia.etherscan.io/address/", explorerTx: "https://sepolia.etherscan.io/tx/", testnet: true, faucet: "https://sepoliafaucet.com/" },
      },
      // JSON-RPC eth_getBalance → hex-string wei.
      async fetchBalance({ rpc, address }) {
        const r = await fetch(rpc, { method: "POST", headers: { "content-type": "application/json" },
          body: JSON.stringify({ jsonrpc: "2.0", id: 1, method: "eth_getBalance", params: [address, "latest"] }) });
        const j = await r.json();
        const hex = String(j?.result || "0x0").replace(/^0x/, "");
        return BigInt("0x" + hex).toString();
      },
    },
    trx: {
      ticker: "TRX", decimals: 6,
      networks: {
        mainnet:  { id: "mainnet", label: "Mainnet", rpc: "https://api.trongrid.io",  explorerAddr: "https://tronscan.org/#/address/", explorerTx: "https://tronscan.org/#/transaction/" },
        nile:     { id: "nile",    label: "Nile testnet", rpc: "https://api.nileex.io", explorerAddr: "https://nile.tronscan.org/#/address/", explorerTx: "https://nile.tronscan.org/#/transaction/", testnet: true, faucet: "https://nileex.io/join/getJoinPage" },
      },
      // Tron HTTP API returns account.balance in SUN (10^-6 TRX).
      async fetchBalance({ rpc, address }) {
        const r = await fetch(rpc.replace(/\/+$/, "") + "/wallet/getaccount", { method: "POST",
          headers: { "content-type": "application/json" },
          body: JSON.stringify({ address, visible: true }) });
        const j = await r.json();
        return String(j?.balance || 0);
      },
    },
    sol: {
      ticker: "SOL", decimals: 9,
      networks: {
        mainnet:  { id: "mainnet", label: "Mainnet-beta", rpc: "https://api.mainnet-beta.solana.com", explorerAddr: "https://explorer.solana.com/address/", explorerTx: "https://explorer.solana.com/tx/" },
        devnet:   { id: "devnet",  label: "Devnet",       rpc: "https://api.devnet.solana.com",       explorerAddr: "https://explorer.solana.com/address/", explorerTx: "https://explorer.solana.com/tx/", explorerSuffix: "?cluster=devnet", testnet: true, faucet: "https://faucet.solana.com/" },
      },
      // Solana JSON-RPC getBalance returns lamports as a number.
      async fetchBalance({ rpc, address }) {
        const r = await fetch(rpc, { method: "POST", headers: { "content-type": "application/json" },
          body: JSON.stringify({ jsonrpc: "2.0", id: 1, method: "getBalance", params: [address] }) });
        const j = await r.json();
        return String(j?.result?.value || 0);
      },
    },
  };

  class GenericImportedWallet {
    constructor({ chain, network, address, log = () => {}, onChange = () => {}, rpcUrl } = {}) {
      const cfg = CHAIN_CFGS[chain]; if (!cfg) throw new Error(`chain-generic-imported: unknown chain ${chain}`);
      const net = cfg.networks[network]; if (!net) throw new Error(`chain-generic-imported: ${chain} has no network ${network}`);
      if (!address) throw new Error("address required");
      this.chain = chain;
      this.network = network;
      this._cfg = cfg;
      this._net = { ...net, rpc: rpcUrl || net.rpc };
      this.log = log;
      this.onChange = onChange;
      this._address = address;
      this._state = {
        balance: { confirmed: "0", unconfirmed: "0" },
        history: [],
        scanning: false,
        error: null,
      };
      this._pollTimer = null;
    }

    setServers() { /* no-op: this adapter uses HTTP RPC, not electrum */ }
    schedulePoll(ms) {
      clearTimeout(this._pollTimer);
      this._pollTimer = setTimeout(() => { this.refresh(false).catch(() => {}); this.schedulePoll(ms); }, ms);
    }

    _emit() { try { this.onChange(); } catch {} }

    snapshot() {
      return {
        chain: this.chain, network: this.network,
        ticker: this._cfg.ticker, decimals: this._cfg.decimals,
        address: this._address,
        addressIndex: 0,
        addressPath: null,
        balance: this._state.balance,
        history: this._state.history,
        scanning: this._state.scanning,
        error: this._state.error,
        server: this._net.rpc,
        rpcUrl: this._net.rpc,
        imported: true,
        explorerAddr: this._net.explorerAddr,
        explorerTx: this._net.explorerTx,
        explorerSuffix: this._net.explorerSuffix || "",
        faucet: this._net.faucet || null,
      };
    }

    async refresh() {
      this._state.scanning = true; this._emit();
      try {
        const confirmed = await this._cfg.fetchBalance({ rpc: this._net.rpc, address: this._address });
        this._state.balance = { confirmed: String(confirmed || 0), unconfirmed: "0" };
        this._state.error = null;
      } catch (e) {
        this._state.error = e?.message || String(e);
      } finally {
        this._state.scanning = false;
        this._emit();
      }
    }

    nextAddress() { return { address: this._address, index: 0 }; }
    current() { return { address: this._address, index: 0, branch: 0, path: null }; }

    plan() { throw new Error(`Imported ${this.chain.toUpperCase()} wallets are read-only in this build. Spending support ships in the next Aegis update.`); }
    signAndBroadcast() { throw new Error("read-only"); }
    signMessage() { throw new Error("read-only"); }

    recovery() { return { accountPath: null, xpub: null, xprv: null, note: "Recovery lives in the source of the import." }; }

    dispose() { clearTimeout(this._pollTimer); }
  }

  return { GenericImportedWallet, CHAIN_CFGS };
};