// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.8.2;


interface ISavingsManager {
    /** @dev Admin privs */
    function distributeUnallocatedInterest(address _mAsset) external;

    /** @dev Liquidator */
    function depositLiquidation(address _mAsset, uint256 _liquidation) external;

    /** @dev Liquidator */
    function collectAndStreamInterest(address _mAsset) external;

    /** @dev Public privs */
    function collectAndDistributeInterest(address _mAsset) external;
}

contract ModuleKeys {
    // Governance
    // ===========
    // keccak256("Governance");
    bytes32 internal constant KEY_GOVERNANCE =
        0x9409903de1e6fd852dfc61c9dacb48196c48535b60e25abf92acc92dd689078d;
    //keccak256("Staking");
    bytes32 internal constant KEY_STAKING =
        0x1df41cd916959d1163dc8f0671a666ea8a3e434c13e40faef527133b5d167034;
    //keccak256("ProxyAdmin");
    bytes32 internal constant KEY_PROXY_ADMIN =
        0x96ed0203eb7e975a4cbcaa23951943fa35c5d8288117d50c12b3d48b0fab48d1;

    // mStable
    // =======
    // keccak256("OracleHub");
    bytes32 internal constant KEY_ORACLE_HUB =
        0x8ae3a082c61a7379e2280f3356a5131507d9829d222d853bfa7c9fe1200dd040;
    // keccak256("Manager");
    bytes32 internal constant KEY_MANAGER =
        0x6d439300980e333f0256d64be2c9f67e86f4493ce25f82498d6db7f4be3d9e6f;
    //keccak256("Recollateraliser");
    bytes32 internal constant KEY_RECOLLATERALISER =
        0x39e3ed1fc335ce346a8cbe3e64dd525cf22b37f1e2104a755e761c3c1eb4734f;
    //keccak256("MetaToken");
    bytes32 internal constant KEY_META_TOKEN =
        0xea7469b14936af748ee93c53b2fe510b9928edbdccac3963321efca7eb1a57a2;
    // keccak256("SavingsManager");
    bytes32 internal constant KEY_SAVINGS_MANAGER =
        0x12fe936c77a1e196473c4314f3bed8eeac1d757b319abb85bdda70df35511bf1;
    // keccak256("Liquidator");
    bytes32 internal constant KEY_LIQUIDATOR =
        0x1e9cb14d7560734a61fa5ff9273953e971ff3cd9283c03d8346e3264617933d4;
    // keccak256("InterestValidator");
    bytes32 internal constant KEY_INTEREST_VALIDATOR =
        0xc10a28f028c7f7282a03c90608e38a4a646e136e614e4b07d119280c5f7f839f;
}

interface INexus {
    function governor() external view returns (address);

    function getModule(bytes32 key) external view returns (address);

    function proposeModule(bytes32 _key, address _addr) external;

    function cancelProposedModule(bytes32 _key) external;

    function acceptProposedModule(bytes32 _key) external;

    function acceptProposedModules(bytes32[] calldata _keys) external;

    function requestLockModule(bytes32 _key) external;

    function cancelLockModule(bytes32 _key) external;

    function lockModule(bytes32 _key) external;
}

abstract contract ImmutableModule is ModuleKeys {
    INexus public immutable nexus;

    /**
     * @dev Initialization function for upgradable proxy contracts
     * @param _nexus Nexus contract address
     */
    constructor(address _nexus) {
        require(_nexus != address(0), "Nexus address is zero");
        nexus = INexus(_nexus);
    }

    /**
     * @dev Modifier to allow function calls only from the Governor.
     */
    modifier onlyGovernor() {
        _onlyGovernor();
        _;
    }

    function _onlyGovernor() internal view {
        require(msg.sender == _governor(), "Only governor can execute");
    }

    /**
     * @dev Modifier to allow function calls only from the Governance.
     *      Governance is either Governor address or Governance address.
     */
    modifier onlyGovernance() {
        require(
            msg.sender == _governor() || msg.sender == _governance(),
            "Only governance can execute"
        );
        _;
    }

    /**
     * @dev Modifier to allow function calls only from the ProxyAdmin.
     */
    modifier onlyProxyAdmin() {
        require(msg.sender == _proxyAdmin(), "Only ProxyAdmin can execute");
        _;
    }

    /**
     * @dev Modifier to allow function calls only from the Manager.
     */
    modifier onlyManager() {
        require(msg.sender == _manager(), "Only manager can execute");
        _;
    }

    /**
     * @dev Returns Governor address from the Nexus
     * @return Address of Governor Contract
     */
    function _governor() internal view returns (address) {
        return nexus.governor();
    }

    /**
     * @dev Returns Governance Module address from the Nexus
     * @return Address of the Governance (Phase 2)
     */
    function _governance() internal view returns (address) {
        return nexus.getModule(KEY_GOVERNANCE);
    }

    /**
     * @dev Return Staking Module address from the Nexus
     * @return Address of the Staking Module contract
     */
    function _staking() internal view returns (address) {
        return nexus.getModule(KEY_STAKING);
    }

    /**
     * @dev Return ProxyAdmin Module address from the Nexus
     * @return Address of the ProxyAdmin Module contract
     */
    function _proxyAdmin() internal view returns (address) {
        return nexus.getModule(KEY_PROXY_ADMIN);
    }

    /**
     * @dev Return MetaToken Module address from the Nexus
     * @return Address of the MetaToken Module contract
     */
    function _metaToken() internal view returns (address) {
        return nexus.getModule(KEY_META_TOKEN);
    }

    /**
     * @dev Return OracleHub Module address from the Nexus
     * @return Address of the OracleHub Module contract
     */
    function _oracleHub() internal view returns (address) {
        return nexus.getModule(KEY_ORACLE_HUB);
    }

    /**
     * @dev Return Manager Module address from the Nexus
     * @return Address of the Manager Module contract
     */
    function _manager() internal view returns (address) {
        return nexus.getModule(KEY_MANAGER);
    }

    /**
     * @dev Return SavingsManager Module address from the Nexus
     * @return Address of the SavingsManager Module contract
     */
    function _savingsManager() internal view returns (address) {
        return nexus.getModule(KEY_SAVINGS_MANAGER);
    }

    /**
     * @dev Return Recollateraliser Module address from the Nexus
     * @return  Address of the Recollateraliser Module contract (Phase 2)
     */
    function _recollateraliser() internal view returns (address) {
        return nexus.getModule(KEY_RECOLLATERALISER);
    }
}

/**
 * @title Collector
 * @dev Distributes unallocated interest across multiple mAssets via savingsManager
 */
contract Collector is ImmutableModule {
    constructor(address _nexus) ImmutableModule(_nexus) {}

    /**
     * @dev Distributes the interest accrued across multiple mAssets, optionally
     * calling collectAndDistribute beforehand.
     */
    function distributeInterest(address[] calldata _mAssets, bool _collectFirst) external {
        ISavingsManager savingsManager = ISavingsManager(_savingsManager());
        uint256 len = _mAssets.length;
        require(len > 0, "Invalid inputs");
        for (uint256 i = 0; i < len; i++) {
            if (_collectFirst) savingsManager.collectAndDistributeInterest(_mAssets[i]);

            savingsManager.distributeUnallocatedInterest(_mAssets[i]);
        }
    }
}

{
  "compilationTarget": {
    "Collector.sol": "Collector"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}