// Per-chain address derivation for imported wallets. Every helper turns
// either a BIP39 mnemonic (+ path) OR a raw private key (chain-native
// format — WIF for UTXO chains, hex for account chains, base58 for Solana)
// into the canonical address that chain uses.
//
// Deps arrive from index.js loadDeps() so nothing here has to know about
// npm packages — same "hand it in" pattern the other adapters use.

module.exports = function makeImportDerive({
  HDKey, secp256k1, ed25519, sha256, ripemd160, keccak_256,
  cashaddr, base58check, bitcoinjs, bip32Factory, ecpairFactory, ecc, bip39,
  dgbCore,
}) {
  const toHex = (b) => Array.from(b, (x) => x.toString(16).padStart(2, "0")).join("");
  const fromHex = (h) => {
    const s = String(h || "").replace(/^0x/i, "");
    const out = new Uint8Array(s.length / 2);
    for (let i = 0; i < out.length; i++) out[i] = parseInt(s.substr(i * 2, 2), 16);
    return out;
  };
  const hash160 = (b) => ripemd160(sha256(b));

  // BIP39 mnemonic → 64-byte seed hex. Same wire format the vault-derive
  // path stores, so keystore-mirrored seeds land in wallet-imports.enc
  // identically whether they came from a mnemonic or hex directly.
  function mnemonicToSeedHex(m) {
    if (!bip39.validateMnemonic(m)) throw new Error("invalid BIP39 mnemonic");
    return toHex(bip39.mnemonicToSeedSync(m));
  }

  // ---- BTC ------------------------------------------------------------------
  const BTC_NET = {
    mainnet: bitcoinjs.networks.bitcoin,
    testnet3: bitcoinjs.networks.testnet,
    signet: bitcoinjs.networks.testnet, // signet uses testnet params here
  };
  function btcAddressFromNode(node, path, network) {
    const net = BTC_NET[network];
    if (!net) throw new Error(`unknown BTC network ${network}`);
    // Purpose byte in the path decides the address type. m/84' -> bech32,
    // m/49' -> P2SH-P2WPKH, m/86' -> P2TR, m/44' -> P2PKH.
    const m = /^m\/(\d+)'/.exec(String(path || ""));
    const purpose = m ? Number(m[1]) : 84;
    const pk = Buffer.from(node.publicKey);
    if (purpose === 86) {
      // Taproot — bitcoinjs.p2tr wants the 32-byte x-only pubkey.
      const xonly = pk.slice(1, 33);
      return bitcoinjs.payments.p2tr({ internalPubkey: xonly, network: net }).address;
    }
    if (purpose === 84) return bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }).address;
    if (purpose === 49) return bitcoinjs.payments.p2sh({ redeem: bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }) }).address;
    return bitcoinjs.payments.p2pkh({ pubkey: pk, network: net }).address;
  }
  function deriveBtcFromSeed(seedHex, path, network) {
    const bip32 = bip32Factory(ecc);
    const node = bip32.fromSeed(Buffer.from(fromHex(seedHex)), BTC_NET[network]).derivePath(path);
    return btcAddressFromNode(node, path, network);
  }
  function deriveBtcFromWif(wif, network, hint) {
    const ECPair = ecpairFactory(ecc);
    const kp = ECPair.fromWIF(wif, BTC_NET[network]);
    // WIF alone doesn't tell us the address family; caller passes hint = 44/49/84/86.
    const purpose = hint || 84;
    const pk = kp.publicKey;
    const net = BTC_NET[network];
    if (purpose === 86) {
      const xonly = pk.slice(1, 33);
      return bitcoinjs.payments.p2tr({ internalPubkey: xonly, network: net }).address;
    }
    if (purpose === 84) return bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }).address;
    if (purpose === 49) return bitcoinjs.payments.p2sh({ redeem: bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }) }).address;
    return bitcoinjs.payments.p2pkh({ pubkey: pk, network: net }).address;
  }

  // ---- DGB (mirrors BTC pattern with digibyte params) -----------------------
  function digibyteNetwork() {
    if (!dgbCore) throw new Error("DGB adapter not available");
    return dgbCore.digibyte;
  }
  function deriveDgbFromSeed(seedHex, path) {
    const bip32 = bip32Factory(ecc);
    const net = digibyteNetwork();
    const node = bip32.fromSeed(Buffer.from(fromHex(seedHex)), net).derivePath(path);
    const pk = Buffer.from(node.publicKey);
    const m = /^m\/(\d+)'/.exec(String(path || ""));
    const purpose = m ? Number(m[1]) : 84;
    if (purpose === 86) {
      const xonly = pk.slice(1, 33);
      return bitcoinjs.payments.p2tr({ internalPubkey: xonly, network: net }).address;
    }
    if (purpose === 84) return bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }).address;
    if (purpose === 49) return bitcoinjs.payments.p2sh({ redeem: bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }) }).address;
    return bitcoinjs.payments.p2pkh({ pubkey: pk, network: net }).address;
  }
  function deriveDgbFromWif(wif, hint) {
    const ECPair = ecpairFactory(ecc);
    const net = digibyteNetwork();
    const kp = ECPair.fromWIF(wif, net);
    const purpose = hint || 84;
    const pk = kp.publicKey;
    if (purpose === 86) return bitcoinjs.payments.p2tr({ internalPubkey: pk.slice(1, 33), network: net }).address;
    if (purpose === 84) return bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }).address;
    if (purpose === 49) return bitcoinjs.payments.p2sh({ redeem: bitcoinjs.payments.p2wpkh({ pubkey: pk, network: net }) }).address;
    return bitcoinjs.payments.p2pkh({ pubkey: pk, network: net }).address;
  }

  // ---- ETH (EIP-55 checksummed 0x address) ----------------------------------
  function ethAddressFromPubkey(pubUncompressed64) {
    // Strip the 0x04 prefix if present so we hash just the 64 raw bytes.
    const raw = pubUncompressed64.length === 65 ? pubUncompressed64.slice(1) : pubUncompressed64;
    const h = keccak_256(raw);
    const addr20 = h.slice(-20);
    const hex = toHex(addr20);
    // EIP-55 checksum
    const hashOfLower = toHex(keccak_256(new TextEncoder().encode(hex)));
    let out = "0x";
    for (let i = 0; i < hex.length; i++) {
      out += parseInt(hashOfLower[i], 16) >= 8 ? hex[i].toUpperCase() : hex[i];
    }
    return out;
  }
  function deriveEthFromSeed(seedHex, path) {
    const node = HDKey.fromMasterSeed(fromHex(seedHex)).derive(path);
    // secp256k1.getPublicKey with compressed=false gives 65 bytes (04||X||Y).
    const pub = secp256k1.getPublicKey(node.privateKey, false);
    return ethAddressFromPubkey(pub);
  }
  function deriveEthFromPrivHex(hex) {
    const priv = fromHex(hex);
    if (priv.length !== 32) throw new Error("ETH private key must be 32 bytes hex");
    const pub = secp256k1.getPublicKey(priv, false);
    return ethAddressFromPubkey(pub);
  }

  // ---- TRX (T... base58check, network 0x41) --------------------------------
  function tronAddressFromPubkey(pubUncompressed65) {
    const raw = pubUncompressed65.length === 65 ? pubUncompressed65.slice(1) : pubUncompressed65;
    const h = keccak_256(raw);
    const last20 = h.slice(-20);
    const versioned = new Uint8Array(21);
    versioned[0] = 0x41; // Tron mainnet address prefix — same for Nile testnet
    versioned.set(last20, 1);
    return base58check.encodeCheck(versioned);
  }
  function deriveTrxFromSeed(seedHex, path) {
    const node = HDKey.fromMasterSeed(fromHex(seedHex)).derive(path);
    const pub = secp256k1.getPublicKey(node.privateKey, false);
    return tronAddressFromPubkey(pub);
  }
  function deriveTrxFromPrivHex(hex) {
    const priv = fromHex(hex);
    if (priv.length !== 32) throw new Error("TRX private key must be 32 bytes hex");
    const pub = secp256k1.getPublicKey(priv, false);
    return tronAddressFromPubkey(pub);
  }

  // ---- SOL (base58 pubkey, ed25519) ----------------------------------------
  // SLIP-0010 ed25519 hardened derivation. Slightly different HD scheme
  // from BIP32 secp256k1 — every step is hardened, index >= 0x80000000.
  function slip0010DeriveEd25519(seed, path) {
    const HMAC_KEY = new TextEncoder().encode("ed25519 seed");
    const parts = String(path).split("/").slice(1);
    // Compute master
    const enc = new (require("crypto")).createHmac ? require("crypto") : null;
    // Not using node crypto — the deps hand in @noble/hashes hmac via sha512.
    // We rely on secp256k1's helpers? No — use ed25519 utils.
    // Simplified: compute HMAC-SHA512(HMAC_KEY, seed) → I=I_L||I_R, sk=I_L, cc=I_R.
    // Then each step: HMAC-SHA512(cc, 0x00 || sk || idx).
    // Implementation via @noble/hashes/hmac imported as `hmacSha512`. We
    // require it lazily so unavailable deps error out here rather than at
    // load time.
    const { hmac } = require("@noble/hashes/hmac");
    const { sha512 } = require("@noble/hashes/sha2");
    let I = hmac(sha512, HMAC_KEY, seed);
    let sk = I.slice(0, 32); let cc = I.slice(32);
    for (const seg of parts) {
      const m = /^(\d+)'?$/.exec(seg);
      if (!m) throw new Error(`bad path segment: ${seg}`);
      const idx = (Number(m[1]) | 0x80000000) >>> 0;
      const data = new Uint8Array(1 + 32 + 4);
      data[0] = 0;
      data.set(sk, 1);
      data[33] = (idx >>> 24) & 0xff; data[34] = (idx >>> 16) & 0xff;
      data[35] = (idx >>> 8) & 0xff;  data[36] = idx & 0xff;
      I = hmac(sha512, cc, data);
      sk = I.slice(0, 32); cc = I.slice(32);
    }
    return sk;
  }
  function deriveSolFromSeed(seedHex, path) {
    const sk = slip0010DeriveEd25519(fromHex(seedHex), path);
    const pub = ed25519.getPublicKey(sk);
    return base58check.encodeBase58(pub);
  }
  function deriveSolFromPrivHex(hex) {
    const priv = fromHex(hex);
    if (priv.length !== 32 && priv.length !== 64) throw new Error("SOL private key must be 32 or 64 bytes hex");
    const seed = priv.length === 64 ? priv.slice(0, 32) : priv;
    const pub = ed25519.getPublicKey(seed);
    return base58check.encodeBase58(pub);
  }
  function deriveSolFromBase58(b58) {
    const bytes = base58check.decodeBase58(b58);
    if (bytes.length !== 32 && bytes.length !== 64) throw new Error("SOL private key base58 must decode to 32 or 64 bytes");
    const seed = bytes.length === 64 ? bytes.slice(0, 32) : bytes;
    const pub = ed25519.getPublicKey(seed);
    return base58check.encodeBase58(pub);
  }

  return {
    mnemonicToSeedHex,
    btc: { fromSeed: deriveBtcFromSeed, fromWif: deriveBtcFromWif },
    dgb: { fromSeed: deriveDgbFromSeed, fromWif: deriveDgbFromWif },
    eth: { fromSeed: deriveEthFromSeed, fromPrivHex: deriveEthFromPrivHex },
    trx: { fromSeed: deriveTrxFromSeed, fromPrivHex: deriveTrxFromPrivHex },
    sol: { fromSeed: deriveSolFromSeed, fromPrivHex: deriveSolFromPrivHex, fromBase58: deriveSolFromBase58 },
  };
};