import 'package:flutter/services.dart';
import 'package:flutter_bitcoin/flutter_bitcoin.dart' as bitcoin;
import 'dart:typed_data';
import 'package:hex/hex.dart';
import 'package:crypto/crypto.dart';
import 'package:bip39/bip39.dart' as bip39;
import 'package:bip32/bip32.dart' as bip32;

final bip32.NetworkType hnsMainnet = bip32.NetworkType(
  bip32: bip32.Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
  wif: 0x80,
);

final bitcoin.NetworkType hnsMainnetBitcoin = bitcoin.NetworkType(
    messagePrefix: '\x18Handshake Signed Message:\n',
    bech32: 'hs',
    bip32: bitcoin.Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
    pubKeyHash: 0x00,
    scriptHash: 0x05,
    wif: 0x80);

String getXpub(String seedPhrase) {
  List<int> seedints = bip39.mnemonicToSeed(seedPhrase);
  Uint8List seed = Uint8List.fromList(seedints);
  bip32.BIP32 master = bip32.BIP32.fromSeed(seed, hnsMainnet);
  return master.derivePath("m/44'/5353'/0'").neutered().toBase58();
}

Future<String> signTX(String seedPhrase, Map<String, dynamic> txData) async {
  final seed = bip39.mnemonicToSeed(seedPhrase);
  final master = bip32.BIP32.fromSeed(seed, hnsMainnet);

  final txb = bitcoin.TransactionBuilder(
    network: hnsMainnetBitcoin,
  );

  // for (var input in txData['inputs']) {
  //   final prevout = input['prevout'];
  //   final vin = input['vin'];
  //   if (vin != null && vin is int) {
  //     final hash = prevout['hash'];
  //     final index = prevout['index'];
  //     bitcoin.ECPair keyPair = bitcoin.ECPair.fromPrivateKey(
  //         master.derivePath("m/44'/5353'/0'/0/$vin").privateKey!,
  //         network: hnsMainnetBitcoin);
  //     txb.addInput(hash, index);
  //     txb.sign(vin: vin, keyPair: keyPair);
  //   } else {
  //     print('vin is not an int');
  //     print(input);
  //   }
  // }
  for (var input in txData['inputs']) {
    final prevout = input['prevout'];
    final coin = input['coin'];
    final index = prevout['index'];
    final hash = prevout['hash'];
    final vin = coin['height'];
    print(input);

    bitcoin.ECPair keyPair = bitcoin.ECPair.fromPrivateKey(
      master.derivePath("m/44'/5353'/0'/0/$vin").privateKey!,
      network: hnsMainnetBitcoin,
    );

    txb.addInput(hash, index);
    txb.sign(vin: int.parse(vin.toString()), keyPair: keyPair);
  }

  for (var output in txData['outputs']) {
    txb.addOutput(output['address'], output['value']);
  }

  return txb.build().toHex();
}