import 'dart:ffi';
import 'dart:isolate';

import 'package:cw_monero/api/account_list.dart';
import 'package:cw_monero/api/exceptions/creation_transaction_exception.dart';
import 'package:cw_monero/api/monero_output.dart';
import 'package:cw_monero/api/structs/pending_transaction.dart';
import 'package:ffi/ffi.dart';
import 'package:monero/monero.dart' as monero;
import 'package:monero/src/generated_bindings_monero.g.dart' as monero_gen;


String getTxKey(String txId) {
  return monero.Wallet_getTxKey(wptr!, txid: txId);
}

monero.TransactionHistory? txhistory;

void refreshTransactions() {
  txhistory = monero.Wallet_history(wptr!);
  monero.TransactionHistory_refresh(txhistory!);
}

int countOfTransactions() => monero.TransactionHistory_count(txhistory!);

List<Transaction> getAllTransactions() {
  final size = countOfTransactions();

  return List.generate(size, (index) => Transaction(txInfo: monero.TransactionHistory_transaction(txhistory!, index: index)));
}

// TODO(mrcyjanek): ...
Transaction getTransaction(String txId) {
  return Transaction(txInfo: monero.TransactionHistory_transactionById(txhistory!, txid: txId));
}

Future<PendingTransactionDescription> createTransactionSync(
    {required String address,
    required String paymentId,
    required int priorityRaw,
    String? amount,
    int accountIndex = 0,
    List<String> preferredInputs = const []}) async {

  final amt = amount == null ? 0 : monero.Wallet_amountFromString(amount);
  
  final address_ = address.toNativeUtf8(); 
  final paymentId_ = paymentId.toNativeUtf8(); 
  final preferredInputs_ = preferredInputs.join(monero.defaultSeparatorStr).toNativeUtf8();

  final waddr = wptr!.address;
  final addraddr = address_.address;
  final paymentIdAddr = paymentId_.address;
  final preferredInputsAddr = preferredInputs_.address;
  final spaddr = monero.defaultSeparator.address;
  final pendingTx = Pointer<Void>.fromAddress(await Isolate.run(() {
    final tx = monero_gen.MoneroC(DynamicLibrary.open(monero.libPath)).MONERO_Wallet_createTransaction(
      Pointer.fromAddress(waddr),
      Pointer.fromAddress(addraddr).cast(),
      Pointer.fromAddress(paymentIdAddr).cast(),
      amt,
      1,
      priorityRaw,
      accountIndex,
      Pointer.fromAddress(preferredInputsAddr).cast(),
      Pointer.fromAddress(spaddr),
    );
    return tx.address;
  }));
  calloc.free(address_);
  calloc.free(paymentId_);
  calloc.free(preferredInputs_);
  final String? error = (() {
    final status = monero.PendingTransaction_status(pendingTx);
    if (status == 0) {
      return null;
    }
    return monero.PendingTransaction_errorString(pendingTx);
  })();

  if (error != null) {
    final message = error;
    throw CreationTransactionException(message: message);
  }

  final rAmt = monero.PendingTransaction_amount(pendingTx);
  final rFee = monero.PendingTransaction_fee(pendingTx);
  final rHash = monero.PendingTransaction_txid(pendingTx, '');
  final rTxKey = rHash;

  return PendingTransactionDescription(
      amount: rAmt,
      fee: rFee,
      hash: rHash,
      hex: '',
      txKey: rTxKey,
      pointerAddress: pendingTx.address,
    );
}

PendingTransactionDescription createTransactionMultDestSync(
    {required List<MoneroOutput> outputs,
    required String paymentId,
    required int priorityRaw,
    int accountIndex = 0,
    List<String> preferredInputs = const []}) {
  
  final txptr = monero.Wallet_createTransactionMultDest(
    wptr!,
    dstAddr: outputs.map((e) => e.address).toList(),
    isSweepAll: false,
    amounts: outputs.map((e) => monero.Wallet_amountFromString(e.amount)).toList(),
    mixinCount: 0,
    pendingTransactionPriority: priorityRaw,
    subaddr_account: accountIndex,
  );
  if (monero.PendingTransaction_status(txptr) != 0) {
    throw CreationTransactionException(message: monero.PendingTransaction_errorString(txptr));
  }
  return PendingTransactionDescription(
    amount: monero.PendingTransaction_amount(txptr),
    fee: monero.PendingTransaction_fee(txptr),
    hash: monero.PendingTransaction_txid(txptr, ''),
    hex: monero.PendingTransaction_txid(txptr, ''),
    txKey: monero.PendingTransaction_txid(txptr, ''),
    pointerAddress: txptr.address,
  );
}

void commitTransactionFromPointerAddress({required int address}) =>
    commitTransaction(transactionPointer: monero.PendingTransaction.fromAddress(address));

void commitTransaction({required monero.PendingTransaction transactionPointer}) {
  
  final txCommit = monero.PendingTransaction_commit(transactionPointer, filename: '', overwrite: false);

  final String? error = (() {
    final status = monero.PendingTransaction_status(transactionPointer.cast());
    if (status == 0) {
      return null;
    }
    return monero.Wallet_errorString(wptr!);
  })();
  
  if (error != null) {
    throw CreationTransactionException(message: error);
  }
}

Future<PendingTransactionDescription> _createTransactionSync(Map args) async {
  final address = args['address'] as String;
  final paymentId = args['paymentId'] as String;
  final amount = args['amount'] as String?;
  final priorityRaw = args['priorityRaw'] as int;
  final accountIndex = args['accountIndex'] as int;
  final preferredInputs = args['preferredInputs'] as List<String>;

  return createTransactionSync(
      address: address,
      paymentId: paymentId,
      amount: amount,
      priorityRaw: priorityRaw,
      accountIndex: accountIndex,
      preferredInputs: preferredInputs);
}

PendingTransactionDescription _createTransactionMultDestSync(Map args) {
  final outputs = args['outputs'] as List<MoneroOutput>;
  final paymentId = args['paymentId'] as String;
  final priorityRaw = args['priorityRaw'] as int;
  final accountIndex = args['accountIndex'] as int;
  final preferredInputs = args['preferredInputs'] as List<String>;

  return createTransactionMultDestSync(
      outputs: outputs,
      paymentId: paymentId,
      priorityRaw: priorityRaw,
      accountIndex: accountIndex,
      preferredInputs: preferredInputs);
}

Future<PendingTransactionDescription> createTransaction(
        {required String address,
        required int priorityRaw,
        String? amount,
        String paymentId = '',
        int accountIndex = 0,
        List<String> preferredInputs = const []}) async =>
    _createTransactionSync({
      'address': address,
      'paymentId': paymentId,
      'amount': amount,
      'priorityRaw': priorityRaw,
      'accountIndex': accountIndex,
      'preferredInputs': preferredInputs
    });

Future<PendingTransactionDescription> createTransactionMultDest(
        {required List<MoneroOutput> outputs,
        required int priorityRaw,
        String paymentId = '',
        int accountIndex = 0,
        List<String> preferredInputs = const []}) async =>
    _createTransactionMultDestSync({
      'outputs': outputs,
      'paymentId': paymentId,
      'priorityRaw': priorityRaw,
      'accountIndex': accountIndex,
      'preferredInputs': preferredInputs
    });


class Transaction {
  final String displayLabel;
  String subaddressLabel = monero.Wallet_getSubaddressLabel(wptr!, accountIndex: 0, addressIndex: 0);
  late final String address = monero.Wallet_address(
    wptr!,
    accountIndex: 0,
    addressIndex: 0,
  );
  final String description;
  final int fee;
  final int confirmations;
  late final bool isPending = confirmations < 10;
  final int blockheight;
  final int addressIndex = 0;
  final int accountIndex;
  final String paymentId;
  final int amount;
  final bool isSpend;
  late DateTime timeStamp;
  late final bool isConfirmed = !isPending;
  final String hash;
  final String key;

  Map<String, dynamic> toJson() {
    return {
      "displayLabel": displayLabel,
      "subaddressLabel": subaddressLabel,
      "address": address,
      "description": description,
      "fee": fee,
      "confirmations": confirmations,
      "isPending": isPending,
      "blockheight": blockheight,
      "accountIndex": accountIndex,
      "addressIndex": addressIndex,
      "paymentId": paymentId,
      "amount": amount,
      "isSpend": isSpend,
      "timeStamp": timeStamp.toIso8601String(),
      "isConfirmed": isConfirmed,
      "hash": hash,
    };
  }

  // S finalubAddress? subAddress;
  // List<Transfer> transfers = [];
  // final int txIndex;
  final monero.TransactionInfo txInfo;
  Transaction({
    required this.txInfo,
  })  : displayLabel = monero.TransactionInfo_label(txInfo),
        hash = monero.TransactionInfo_hash(txInfo),
        timeStamp = DateTime.fromMillisecondsSinceEpoch(
          monero.TransactionInfo_timestamp(txInfo) * 1000,
        ),
        isSpend = monero.TransactionInfo_direction(txInfo) ==
            monero.TransactionInfo_Direction.Out,
        amount = monero.TransactionInfo_amount(txInfo),
        paymentId = monero.TransactionInfo_paymentId(txInfo),
        accountIndex = monero.TransactionInfo_subaddrAccount(txInfo),
        blockheight = monero.TransactionInfo_blockHeight(txInfo),
        confirmations = monero.TransactionInfo_confirmations(txInfo),
        fee = monero.TransactionInfo_fee(txInfo),
        description = monero.TransactionInfo_description(txInfo),
        key = monero.Wallet_getTxKey(wptr!, txid: monero.TransactionInfo_hash(txInfo));
}