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// SPDX-License-Identifier: MIT
// Based on https://github.com/compound-developers/compound-3-developer-faq
pragma solidity 0.8.28;


library CometStructs {
  struct AssetInfo {
    uint8 offset;
    address asset;
    address priceFeed;
    uint64 scale;
    uint64 borrowCollateralFactor;
    uint64 liquidateCollateralFactor;
    uint64 liquidationFactor;
    uint128 supplyCap;
  }

  struct UserBasic {
    int104 principal;
    uint64 baseTrackingIndex;
    uint64 baseTrackingAccrued;
    uint16 assetsIn;
    uint8 _reserved;
  }

  struct TotalsBasic {
    uint64 baseSupplyIndex;
    uint64 baseBorrowIndex;
    uint64 trackingSupplyIndex;
    uint64 trackingBorrowIndex;
    uint104 totalSupplyBase;
    uint104 totalBorrowBase;
    uint40 lastAccrualTime;
    uint8 pauseFlags;
  }

  struct UserCollateral {
    uint128 balance;
    uint128 _reserved;
  }

  struct RewardOwed {
    address token;
    uint owed;
  }

  struct TotalsCollateral {
    uint128 totalSupplyAsset;
    uint128 _reserved;
  }

  

}

interface Comet {
  
  function baseScale() external view returns (uint);
  function supply(address asset, uint amount) external;
  function withdraw(address asset, uint amount) external;

  function getSupplyRate(uint utilization) external view returns (uint);
  function getBorrowRate(uint utilization) external view returns (uint);

  function getAssetInfoByAddress(address asset) external view returns (CometStructs.AssetInfo memory);
  function getAssetInfo(uint8 i) external view returns (CometStructs.AssetInfo memory);


  function getPrice(address priceFeed) external view returns (uint128);

  function userBasic(address) external view returns (CometStructs.UserBasic memory);
  function totalsBasic() external view returns (CometStructs.TotalsBasic memory);
  function userCollateral(address, address) external view returns (CometStructs.UserCollateral memory);

  function baseTokenPriceFeed() external view returns (address);

  function numAssets() external view returns (uint8);

  function getUtilization() external view returns (uint);

  function baseTrackingSupplySpeed() external view returns (uint);
  function baseTrackingBorrowSpeed() external view returns (uint);

  function totalSupply() external view returns (uint256);
  function totalBorrow() external view returns (uint256);

  function baseIndexScale() external pure returns (uint64);

  function totalsCollateral(address asset) external view returns (CometStructs.TotalsCollateral memory);

  function baseMinForRewards() external view returns (uint256);
  function baseToken() external view returns (address);
}

interface CometRewards {
  function getRewardOwed(address comet, address account) external returns (CometStructs.RewardOwed memory);
  function claim(address comet, address src, bool shouldAccrue) external;
}

interface ERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function decimals() external view returns(uint8);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
}

contract CompoundV3Helper {

    struct SupplyRate {
    uint256 baseAPR;
    uint256 rewardAPR;
    uint256 blockHeight;
  }
  //address public cometAddress;
  uint constant public DAYS_PER_YEAR = 365;
  uint constant public SECONDS_PER_DAY = 60 * 60 * 24;
  uint constant public SECONDS_PER_YEAR = SECONDS_PER_DAY * DAYS_PER_YEAR;
  //uint public BASE_MANTISSA;
  //uint public BASE_INDEX_SCALE;
  uint constant public MAX_UINT = type(uint).max;
  address immutable public REWARD_PRICE_FEED;


  constructor(address _rewardPriceFeed) {
    REWARD_PRICE_FEED = _rewardPriceFeed;
  }


  function BASE_MANTISSA(address _cometAddress) public view returns(uint256) {
    return Comet(_cometAddress).baseScale();

  }

  function BASE_INDEX_SCALE(address _cometAddress) public view returns(uint256) {
    return Comet(_cometAddress).baseIndexScale();
  }


  /*
   * Get the current borrow APR in Compound III
   */
  function getBorrowApr(address _cometAddress) public view returns (uint) {
    Comet comet = Comet(_cometAddress);
    uint utilization = comet.getUtilization();
    return comet.getBorrowRate(utilization) * SECONDS_PER_YEAR * 100;
  }

  function getSupplyRateAndTvl(address _cometAddress) 
      external 
      view 
      returns(
        SupplyRate memory rate, 
        uint256 baseTokenTvl, 
        uint256 blockUnixTimestamp
    ) 
    {
        rate.blockHeight = block.number;
        rate.baseAPR = getSupplyApr(_cometAddress);
        rate.rewardAPR = getRewardAprForSupplyBase(_cometAddress, REWARD_PRICE_FEED); 
        baseTokenTvl = getBaseTokenTvl(_cometAddress);
        blockUnixTimestamp = block.timestamp;
    }

  /*
   * Get the current supply APR in Compound III
   */
  function getSupplyApr(address _cometAddress) public view returns (uint) {
    Comet comet = Comet(_cometAddress);
    uint utilization = comet.getUtilization();
    return comet.getSupplyRate(utilization) * SECONDS_PER_YEAR * 100;
  }

  /*
   * Get the current reward for supplying APR in Compound III
   * @param rewardTokenPriceFeed The address of the reward token (e.g. COMP) price feed
   * @return The reward APR in USD as a decimal scaled up by 1e18
   */
  function getRewardAprForSupplyBase(address _cometAddress, address rewardTokenPriceFeed) public view returns (uint) {
    Comet comet = Comet(_cometAddress);
    uint rewardTokenPriceInUsd = getCompoundPrice(_cometAddress, rewardTokenPriceFeed);
    uint usdcPriceInUsd = getCompoundPrice(_cometAddress, comet.baseTokenPriceFeed());
    uint usdcTotalSupply = comet.totalSupply();
    uint baseTrackingSupplySpeed = comet.baseTrackingSupplySpeed();
    uint rewardToSuppliersPerDay = baseTrackingSupplySpeed * SECONDS_PER_DAY * BASE_INDEX_SCALE(_cometAddress) / BASE_MANTISSA(_cometAddress);
    
    // this is tech multiplyer
    uint256 scale;
    if (comet.baseScale() == 1e18 ) {
        scale = 24;
    }
    uint supplyBaseRewardApr = rewardTokenPriceInUsd * rewardToSuppliersPerDay * DAYS_PER_YEAR * 10**scale 
        / (usdcTotalSupply * usdcPriceInUsd);
    return supplyBaseRewardApr;
  }

  

  /*
   * Get the current reward for borrowing APR in Compound III
   * @param rewardTokenPriceFeed The address of the reward token (e.g. COMP) price feed
   * @return The reward APR in USD as a decimal scaled up by 1e18
   */
  function getRewardAprForBorrowBase(address _cometAddress, address rewardTokenPriceFeed) public view returns (uint) {
    Comet comet = Comet(_cometAddress);
    uint rewardTokenPriceInUsd = getCompoundPrice(_cometAddress, rewardTokenPriceFeed);
    uint usdcPriceInUsd = getCompoundPrice(_cometAddress, comet.baseTokenPriceFeed());
    uint usdcTotalBorrow = comet.totalBorrow();
    uint baseTrackingBorrowSpeed = comet.baseTrackingBorrowSpeed();
    uint rewardToSuppliersPerDay = baseTrackingBorrowSpeed * SECONDS_PER_DAY * (BASE_INDEX_SCALE(_cometAddress) / BASE_MANTISSA(_cometAddress));
    uint borrowBaseRewardApr = (rewardTokenPriceInUsd * rewardToSuppliersPerDay / (usdcTotalBorrow * usdcPriceInUsd)) * DAYS_PER_YEAR;
    return borrowBaseRewardApr;
  }



  

  /*
   * Get the price feed address for an asset
   */
  function getPriceFeedAddress(address _cometAddress, address asset) public view returns (address) {
    Comet comet = Comet(_cometAddress);
    return comet.getAssetInfoByAddress(asset).priceFeed;
  }

  /*
   * Get the price feed address for the base token
   */
  function getBaseTokenPriceFeed(address _cometAddress) public view returns (address) {
    Comet comet = Comet(_cometAddress);
    return comet.baseTokenPriceFeed();
  }

  /*
   * Get the current price of an asset from the protocol's persepctive
   */
  function getCompoundPrice(address _cometAddress, address singleAssetPriceFeed) public view returns (uint) {
    Comet comet = Comet(_cometAddress);
    return comet.getPrice(singleAssetPriceFeed);
  }

  /*
   * Gets the amount of reward tokens due to this contract address
   */
  function getRewardsOwed(address _cometAddress, address rewardsContract) public returns (uint) {
    return CometRewards(rewardsContract).getRewardOwed(_cometAddress, address(this)).owed;
  }



  /*
   * Gets the Compound III TVL in USD scaled up by 1e8
   */
  function getTvl(address _cometAddress) public view returns (uint) {
    Comet comet = Comet(_cometAddress);

    uint baseScale = 10 ** ERC20(_cometAddress).decimals();
    uint basePrice = getCompoundPrice(_cometAddress, comet.baseTokenPriceFeed());
    uint totalSupplyBase = comet.totalSupply();

    uint tvlUsd = totalSupplyBase * basePrice / baseScale;

    uint8 numAssets = comet.numAssets();
    for (uint8 i = 0; i < numAssets; i++) {
      CometStructs.AssetInfo memory asset = comet.getAssetInfo(i);
      CometStructs.TotalsCollateral memory tc = comet.totalsCollateral(asset.asset);
      uint price = getCompoundPrice(_cometAddress, asset.priceFeed);
      uint scale = 10 ** ERC20(asset.asset).decimals();

      tvlUsd += tc.totalSupplyAsset * price / scale;
    }

    return tvlUsd;
  }
  

  /*
   * Gets the Compound III TVL  of Base market token in USD scaled up by 1e8
   */
  function getBaseTokenTvl(address _cometAddress) public view returns (uint tvlUsd) {
        Comet comet = Comet(_cometAddress);
        //address baseTokenAddress = comet.baseToken();
        uint baseScale = 10 ** ERC20(_cometAddress).decimals();
        uint basePrice = getCompoundPrice(_cometAddress, comet.baseTokenPriceFeed());
        uint totalSupplyBase = comet.totalSupply();
        //uint256 totalSupplyBase = ERC20(baseTokenAddress).balanceOf(_cometAddress);
        tvlUsd = totalSupplyBase * basePrice / baseScale;
   }
  
}

{
  "remappings": [
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@Uopenzeppelin/=lib/openzeppelin-contracts-upgradeable.git/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

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000000000000000000000000dbd020caef83efd542f4de03e3cf0c28a4428bd5

-----Decoded View---------------
Arg [0] : _rewardPriceFeed (address): 0xdbd020CAeF83eFd542f4De03e3cF0C28A4428bd5

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dbd020caef83efd542f4de03e3cf0c28a4428bd5