SkyView

// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;










contract MainnetSkyAddresses {
    address internal constant STAKING_ENGINE = 0xCe01C90dE7FD1bcFa39e237FE6D8D9F569e8A6a3;
    address internal constant LOCK_STAKE_SKY = 0xf9A9cfD3229E985B91F99Bc866d42938044FFa1C;
}







contract SkyHelper is MainnetSkyAddresses {
    uint16 constant SKY_REFERRAL_CODE = 1002;
}







interface IJug {
    struct Ilks {
        uint256 duty; // borrow rate per second in 1e27
        uint256 rho;
    }

    function ilks(bytes32) external view returns (Ilks memory);
}






interface ILockstakeEngine {
    // --- Enums ---
    enum FarmStatus {
        UNSUPPORTED,
        ACTIVE,
        DELETED
    }

    // --- Events ---
    event Open(address indexed owner, uint256 indexed index, address urn);
    event SelectFarm(
        address indexed owner, uint256 indexed index, address indexed farm, uint16 ref
    );
    event Lock(address indexed owner, uint256 indexed index, uint256 wad, uint16 ref);
    event Free(
        address indexed owner, uint256 indexed index, address to, uint256 wad, uint256 freed
    );
    event GetReward(
        address indexed owner, uint256 indexed index, address indexed farm, address to, uint256 amt
    );

    // --- Read Functions ---
    function ownerUrnsCount(address owner) external view returns (uint256);
    function ownerUrns(address owner, uint256 index) external view returns (address);
    function isUrnAuth(address owner, uint256 index, address usr) external view returns (bool);
    function urnFarms(address urn) external view returns (address);
    function vat() external view returns (address);
    function ilk() external view returns (bytes32);
    function jug() external view returns (address);

    // --- Write Functions (Urn Management) ---
    function open(uint256 index) external returns (address urn);

    // --- Write Functions (Vote / Farm Selection) ---
    function selectFarm(address owner, uint256 index, address farm, uint16 ref) external;

    // --- Write Functions (Staking) ---
    function lock(address owner, uint256 index, uint256 wad, uint16 ref) external;
    function free(address owner, uint256 index, address to, uint256 wad)
        external
        returns (uint256 freed);

    // --- Write Functions (Rewards) ---
    function getReward(address owner, uint256 index, address farm, address to)
        external
        returns (uint256 amt);
}






interface IStakingRewards {
    function stake(uint256 amount, uint16 referral) external;
    function withdraw(uint256 amount) external;
    function getReward() external;
    function stakingToken() external view returns (address);
    function rewardsToken() external view returns (address);
    function balanceOf(address) external view returns (uint256);
    function earned(address) external view returns (uint256);
}







interface IVat {
    struct Urn {
        uint256 ink; // Locked Collateral  [wad]
        uint256 art; // Debt               [wad]
    }

    function urns(bytes32, address) external view returns (Urn memory);
    function ilks(bytes32 ilk)
        external
        view
        returns (uint256, uint256, uint256, uint256 line, uint256);
}







interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint256 digits);
    function totalSupply() external view returns (uint256 supply);

    function balanceOf(address _owner) external view returns (uint256 balance);

    function transfer(address _to, uint256 _value) external returns (bool success);

    function transferFrom(address _from, address _to, uint256 _value)
        external
        returns (bool success);

    function approve(address _spender, uint256 _value) external returns (bool success);

    function allowance(address _owner, address _spender) external view returns (uint256 remaining);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}












contract SkyView is SkyHelper {
    struct UrnInfo {
        uint256 urnIndex;
        address urnAddr;
        address selectedFarm;
        address farmRewardToken;
        uint256 amountStaked;
        uint256 amountBorrowed;
        AmountEarnedPerFarm[] amountsEarned;
    }

    struct AmountEarnedPerFarm {
        address farm;
        address rewardToken;
        uint256 amountEarned;
    }

    struct GeneralInfo {
        uint256 totalSkyStaked; // in 1e18
        uint256 debtCeiling; // in 1e45
        uint256 borrowRatePerSecond; // in 1e27
        uint256[] totalSkyLockedInFarms;
    }

    function getUserInfo(address _user, address[] calldata _farms)
        public
        view
        returns (UrnInfo[] memory)
    {
        uint256 numOfUrns = ILockstakeEngine(STAKING_ENGINE).ownerUrnsCount(_user);
        UrnInfo[] memory urns = new UrnInfo[](numOfUrns);

        for (uint256 i = 0; i < numOfUrns; ++i) {
            urns[i] = getUrnInfo(_user, i, _farms);
        }

        return urns;
    }

    function getUrnInfo(address _user, uint256 _index, address[] calldata _farms)
        public
        view
        returns (UrnInfo memory)
    {
        ILockstakeEngine engine = ILockstakeEngine(STAKING_ENGINE);
        address urnAddr = engine.ownerUrns(_user, _index);
        IVat.Urn memory urn = IVat(engine.vat()).urns(engine.ilk(), urnAddr);
        uint256 amountStaked = urn.ink;
        uint256 amountBorrowed = urn.art;

        address selectedFarm = engine.urnFarms(urnAddr);
        address farmRewardToken;
        AmountEarnedPerFarm[] memory amountsEarned = new AmountEarnedPerFarm[](_farms.length);

        if (selectedFarm != address(0)) {
            farmRewardToken = IStakingRewards(selectedFarm).rewardsToken();
        }

        for (uint256 i = 0; i < _farms.length; ++i) {
            amountsEarned[i] = AmountEarnedPerFarm({
                farm: _farms[i],
                rewardToken: IStakingRewards(_farms[i]).rewardsToken(),
                amountEarned: IStakingRewards(_farms[i]).earned(urnAddr)
            });
        }

        return UrnInfo({
            urnIndex: _index,
            urnAddr: urnAddr,
            selectedFarm: selectedFarm,
            farmRewardToken: farmRewardToken,
            amountStaked: amountStaked,
            amountBorrowed: amountBorrowed,
            amountsEarned: amountsEarned
        });
    }

    function getGeneralInfo(address[] calldata _farms) public view returns (GeneralInfo memory) {
        uint256 totalSkyStaked = IERC20(LOCK_STAKE_SKY).totalSupply();

        ILockstakeEngine engine = ILockstakeEngine(STAKING_ENGINE);
        (,,, uint256 debtCeiling,) = IVat(engine.vat()).ilks(engine.ilk());

        uint256 borrowRatePerSecond = IJug(engine.jug()).ilks(engine.ilk()).duty;

        uint256[] memory totalSkyLockedInFarms = new uint256[](_farms.length);

        for (uint8 i = 0; i < _farms.length; i++) {
            totalSkyLockedInFarms[i] = IERC20(LOCK_STAKE_SKY).balanceOf(_farms[i]);
        }

        return GeneralInfo({
            totalSkyStaked: totalSkyStaked,
            debtCeiling: debtCeiling,
            borrowRatePerSecond: borrowRatePerSecond,
            totalSkyLockedInFarms: totalSkyLockedInFarms
        });
    }
}