import "../types/structs.scrypt";
import "stdUtils.scrypt";




library _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils {
  static const int ZERO_SATS = 0;
  static function buildOutput(bytes scriptHash, int satoshis) : bytes {
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.buildDataOutput(scriptHash, satoshis, sha256(b''));
  }
  static function buildDataOutput(bytes scriptHash, int satoshis, bytes dataHash) : bytes {
    int scriptHashLen = len(scriptHash);
    int dataHashLen = len(dataHash);
    require(scriptHashLen == 32);
    require(dataHashLen == 32);
    require(satoshis > 0);
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.satoshisToByteString(satoshis) + scriptHash + dataHash;
  }
  static function buildChangeOutput(_opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxOut change) : bytes {
    return change.satoshis > 0 ? _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.buildDataOutput(change.scriptHash, change.satoshis, change.dataHash) : b'';
  }
  static function mergeInput(_opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxIn txInput) : bytes {
    require(len(txInput.prevTxHash) == 32);
    require(len(txInput.scriptHash) == 32);
    return (txInput.prevTxHash + _opcat_labs_scrypt_ts_opcat_4_0_0__rs__StdUtils.uint32ToByteString(txInput.prevOutputIndex) + txInput.scriptHash + _opcat_labs_scrypt_ts_opcat_4_0_0__rs__StdUtils.uint32ToByteString(txInput.sequence));
  }
  static function buildOpReturnOutput(bytes data) : bytes {
    bytes script = b'6a' + pack(len(data)) + data;
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.satoshisToByteString(0) + sha256(script) + sha256(b'');
  }
  static function buildP2PKHScript(Ripemd160 addr) : bytes {
    return (OpCode.OP_DUP + OpCode.OP_HASH160 + pack(20) + addr + OpCode.OP_EQUALVERIFY + OpCode.OP_CHECKSIG);
  }
  static function buildP2PKHOutput(int amount, Ripemd160 addr) : bytes {
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.buildDataOutput(sha256(_opcat_labs_scrypt_ts_opcat_4_0_0__rs__TxUtils.buildP2PKHScript(addr)), amount, sha256(b''));
  }
  static function buildOpreturnScript(bytes data) : bytes {
    return OpCode.OP_FALSE + OpCode.OP_RETURN + _opcat_labs_scrypt_ts_opcat_4_0_0__rs__StdUtils.pushData(data);
  }
  static function satoshisToByteString(int n) : bytes {
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__StdUtils.uint64ToByteString(n);
  }
  static function byteStringToSatoshis(bytes bs) : int {
    require(len(bs) == 8);
    return _opcat_labs_scrypt_ts_opcat_4_0_0__rs__StdUtils.fromLEUnsigned(bs);
  }
}