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245/**
246 * calculates the KAE reward for a Debt
247 *
248 * reward calculation is basically: Math.min((multiplier * debtInUSD), reward cap)
249 * -> multiplier = (interestRate - 1)%
250 * -> reward cap = currentRewardCap
251 *
252 * if (isBorrowerDiscounted && debtInUSD > $50K)
253 *  -> rewardCap = currentRewardCap * 2
254 *
255 * @param interestRate Debt's interest rate in basis point but must be converted to 1e18
256 */
257function _calcReward (uint256 debtInUSD, uint256 interestRate, bool isDiscountedBorrower) internal view returns (uint256)
258{
259  uint256 reward = _calcScaledPercentOf(debtInUSD, _calcPriceAdjustedMultiplier(interestRate - 100));
260
261  // 50_000e18 = $50K in DAI
262  if (isDiscountedBorrower && debtInUSD > 50_000e18)
263  {
264    // 50 = 0.5% in basis point; first converts basis point to 1e18; 0.5% of Debt
265    return Math.min(reward + _calcScaledPercentOf(debtInUSD, _calcPriceAdjustedMultiplier(50)), _config.currentRewardCap * 2);
266  }
267  else
268  {
269    return Math.min(reward, _config.currentRewardCap);
270  }
271}
272
273// front-end
274function calcReward (address debtToken, uint256 debt, uint256 interestRate, bool isDiscountedBorrower) external view returns (uint256)
275{
276  return _calcReward(IOracle(_ADDRESSES.oracle()).convertToUSD(debtToken, debt), interestRate, isDiscountedBorrower);
277}
278
279// @param interestRate Debt interest in basis point but must be converted to 1e18
280function registerDebt (bytes32 debtID, uint256 debtInUSD, uint256 interestRate, bool isDiscountedBorrower) external override
281{
282  require(hasRole(REWARDER_ROLE, msg.sender), "!rewarder");
283  require(_reward[debtID] == 0, "reg'd");
284
285
286  uint256 reward = _calcReward(debtInUSD, interestRate, isDiscountedBorrower);
287
288  require(reward > 0 && reward < type(uint80).max, "bad reward");
289
290
291  _reward[debtID] = uint80(reward);
292}