// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "../contracts/EllipticCurve.sol";
import "../contracts/FastEcMul.sol";


/**
 * @title Test Helper for the EllipticCurve contract
 * @dev The aim of this contract is twofold:
 * 1. Raise the visibility modifier of contract functions for testing purposes
 * 2. Removal of the `pure` modifier to allow gas consumption analysis
 * @author Witnet Foundation
 */
contract EcGasHelper {

  function _toAffine(
    uint256 _x,
    uint256 _y,
    uint256 _z,
    uint256 _pp)
  external returns (uint256, uint256)
  {
    return EllipticCurve.toAffine(
      _x,
      _y,
      _z,
      _pp);
  }

  function _invMod(uint256 _x, uint256 _pp) external returns (uint256) {
    return EllipticCurve.invMod(_x, _pp);
  }

  function _deriveY(
    uint8 _prefix,
    uint256 _x,
    uint256 _aa,
    uint256 _bb,
    uint256 _pp)
  external returns (uint256)
  {
    return EllipticCurve.deriveY(
      _prefix,
      _x,
      _aa,
      _bb,
      _pp);
  }

  function _isOnCurve(
    uint _x,
    uint _y,
    uint _aa,
    uint _bb,
    uint _pp)
  external returns (bool)
  {
    return EllipticCurve.isOnCurve(
      _x,
      _y,
      _aa,
      _bb,
      _pp);
  }

  function _ecInv(
    uint256 _x,
    uint256 _y,
    uint256 _pp)
  external returns (uint256, uint256)
  {
    return EllipticCurve.ecInv(_x, _y, _pp);
  }

  function _ecAdd(
    uint256 _x1,
    uint256 _y1,
    uint256 _x2,
    uint256 _y2,
    uint256 _aa,
    uint256 _pp)
    external returns(uint256, uint256)
  {
    return EllipticCurve.ecAdd(
      _x1,
      _y1,
      _x2,
      _y2,
      _aa,
      _pp);
  }

  function _ecSub(
    uint256 _x1,
    uint256 _y1,
    uint256 _x2,
    uint256 _y2,
    uint256 _aa,
    uint256 _pp)
  external returns(uint256, uint256)
  {
    return EllipticCurve.ecSub(
      _x1,
      _y1,
      _x2,
      _y2,
      _aa,
      _pp);
  }

  function _ecMul(
    uint256 _k,
    uint256 _x,
    uint256 _y,
    uint256 _aa,
    uint256 _pp)
  external returns(uint256, uint256)
  {
    return EllipticCurve.ecMul(
      _k,
      _x,
      _y,
      _aa,
      _pp);
  }

  function _decomposeScalar (uint256 _k, uint256 _nn, uint256 _lambda) external returns (int256, int256) {
    return FastEcMul.decomposeScalar(_k, _nn, _lambda);
  }

  function _ecSimMul(
    int256[4] calldata _scalars,
    uint256[4] calldata _points,
    uint256 _aa,
    uint256 _beta,
    uint256 _pp)
  external returns (uint256, uint256)
  {
    return FastEcMul.ecSimMul(
      _scalars,
      _points,
      _aa,
      _beta,
      _pp);
  }

}