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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/ConfirmedOwner.sol";
import "@chainlink/contracts/src/v0.8/interfaces/KeeperCompatibleInterface.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

/**
 * @title The EthBalanceMonitor contract
 * @notice A keeper-compatible contract that monitors and funds eth addresses
 */
contract EthBalanceMonitor is
    ConfirmedOwner,
    Pausable,
    KeeperCompatibleInterface
{
    // observed limit of 45K + 10k buffer
    uint256 private constant MIN_GAS_FOR_TRANSFER = 55_000;

    event FundsAdded(uint256 amountAdded, uint256 newBalance, address sender);
    event FundsWithdrawn(uint256 amountWithdrawn, address payee);
    event TopUpSucceeded(address indexed recipient);
    event TopUpFailed(address indexed recipient);
    event KeeperRegistryAddressUpdated(address oldAddress, address newAddress);
    event MinWaitPeriodUpdated(
        uint256 oldMinWaitPeriod,
        uint256 newMinWaitPeriod
    );

    error InvalidWatchList();
    error OnlyKeeperRegistry();
    error DuplicateAddress(address duplicate);

    struct Target {
        bool isActive;
        uint96 minBalanceWei;
        uint96 topUpAmountWei;
        uint56 lastTopUpTimestamp; // enough space for 2 trillion years
    }

    address private s_keeperRegistryAddress;
    uint256 private s_minWaitPeriodSeconds;
    address[] private s_watchList;
    mapping(address => Target) internal s_targets;

    /**
     * @param keeperRegistryAddress The address of the keeper registry contract
     * @param minWaitPeriodSeconds The minimum wait period for addresses between funding
     */
    constructor(address keeperRegistryAddress, uint256 minWaitPeriodSeconds)
        ConfirmedOwner(msg.sender)
    {
        setKeeperRegistryAddress(keeperRegistryAddress);
        setMinWaitPeriodSeconds(minWaitPeriodSeconds);
    }

    /**
     * @notice Sets the list of addresses to watch and their funding parameters
     * @param addresses the list of addresses to watch
     * @param minBalancesWei the minimum balances for each address
     * @param topUpAmountsWei the amount to top up each address
     */
    function setWatchList(
        address[] calldata addresses,
        uint96[] calldata minBalancesWei,
        uint96[] calldata topUpAmountsWei
    ) external onlyOwner {
        if (
            addresses.length != minBalancesWei.length ||
            addresses.length != topUpAmountsWei.length
        ) {
            revert InvalidWatchList();
        }
        address[] memory oldWatchList = s_watchList;
        for (uint256 idx = 0; idx < oldWatchList.length; idx++) {
            s_targets[oldWatchList[idx]].isActive = false;
        }
        for (uint256 idx = 0; idx < addresses.length; idx++) {
            if (s_targets[addresses[idx]].isActive) {
                revert DuplicateAddress(addresses[idx]);
            }
            if (addresses[idx] == address(0)) {
                revert InvalidWatchList();
            }
            if (topUpAmountsWei[idx] == 0) {
                revert InvalidWatchList();
            }
            s_targets[addresses[idx]] = Target({
                isActive: true,
                minBalanceWei: minBalancesWei[idx],
                topUpAmountWei: topUpAmountsWei[idx],
                lastTopUpTimestamp: 0
            });
        }
        s_watchList = addresses;
    }

    /**
     * @notice Gets a list of addresses that are under funded
     * @return list of addresses that are underfunded
     */
    function getUnderfundedAddresses() public view returns (address[] memory) {
        address[] memory watchList = s_watchList;
        address[] memory needsFunding = new address[](watchList.length);
        uint256 count = 0;
        uint256 minWaitPeriod = s_minWaitPeriodSeconds;
        uint256 balance = address(this).balance;
        Target memory target;
        for (uint256 idx = 0; idx < watchList.length; idx++) {
            target = s_targets[watchList[idx]];
            if (
                target.lastTopUpTimestamp + minWaitPeriod <= block.timestamp &&
                balance >= target.topUpAmountWei &&
                watchList[idx].balance < target.minBalanceWei
            ) {
                needsFunding[count] = watchList[idx];
                count++;
                balance -= target.topUpAmountWei;
            }
        }
        if (count != watchList.length) {
            assembly {
                mstore(needsFunding, count)
            }
        }
        return needsFunding;
    }

    /**
     * @notice Send funds to the addresses provided
     * @param needsFunding the list of addresses to fund (addresses must be pre-approved)
     */
    function topUp(address[] memory needsFunding) public whenNotPaused {
        uint256 minWaitPeriodSeconds = s_minWaitPeriodSeconds;
        Target memory target;
        for (uint256 idx = 0; idx < needsFunding.length; idx++) {
            target = s_targets[needsFunding[idx]];
            if (
                target.isActive &&
                target.lastTopUpTimestamp + minWaitPeriodSeconds <=
                block.timestamp &&
                needsFunding[idx].balance < target.minBalanceWei
            ) {
                bool success = payable(needsFunding[idx]).send(
                    target.topUpAmountWei
                );
                if (success) {
                    s_targets[needsFunding[idx]].lastTopUpTimestamp = uint56(
                        block.timestamp
                    );
                    emit TopUpSucceeded(needsFunding[idx]);
                } else {
                    emit TopUpFailed(needsFunding[idx]);
                }
            }
            if (gasleft() < MIN_GAS_FOR_TRANSFER) {
                return;
            }
        }
    }

    /**
     * @notice Get list of addresses that are underfunded and return keeper-compatible payload
     * @return upkeepNeeded signals if upkeep is needed, performData is an abi encoded list of addresses that need funds
     */
    function checkUpkeep(bytes calldata)
        external
        view
        override
        whenNotPaused
        returns (bool upkeepNeeded, bytes memory performData)
    {
        address[] memory needsFunding = getUnderfundedAddresses();
        upkeepNeeded = needsFunding.length > 0;
        performData = abi.encode(needsFunding);
        return (upkeepNeeded, performData);
    }

    /**
     * @notice Called by keeper to send funds to underfunded addresses
     * @param performData The abi encoded list of addresses to fund
     */
    function performUpkeep(bytes calldata performData)
        external
        override
        onlyKeeperRegistry
        whenNotPaused
    {
        address[] memory needsFunding = abi.decode(performData, (address[]));
        topUp(needsFunding);
    }

    /**
     * @notice Withdraws the contract balance
     * @param amount The amount of eth (in wei) to withdraw
     * @param payee The address to pay
     */
    function withdraw(uint256 amount, address payable payee)
        external
        onlyOwner
    {
        require(payee != address(0));
        emit FundsWithdrawn(amount, payee);
        payee.transfer(amount);
    }

    /**
     * @notice Receive funds
     */
    receive() external payable {
        emit FundsAdded(msg.value, address(this).balance, msg.sender);
    }

    /**
     * @notice Sets the keeper registry address
     */
    function setKeeperRegistryAddress(address keeperRegistryAddress)
        public
        onlyOwner
    {
        require(keeperRegistryAddress != address(0));
        emit KeeperRegistryAddressUpdated(
            s_keeperRegistryAddress,
            keeperRegistryAddress
        );
        s_keeperRegistryAddress = keeperRegistryAddress;
    }

    /**
     * @notice Sets the minimum wait period (in seconds) for addresses between funding
     */
    function setMinWaitPeriodSeconds(uint256 period) public onlyOwner {
        emit MinWaitPeriodUpdated(s_minWaitPeriodSeconds, period);
        s_minWaitPeriodSeconds = period;
    }

    /**
     * @notice Gets the keeper registry address
     */
    function getKeeperRegistryAddress()
        external
        view
        returns (address keeperRegistryAddress)
    {
        return s_keeperRegistryAddress;
    }

    /**
     * @notice Gets the minimum wait period
     */
    function getMinWaitPeriodSeconds() external view returns (uint256) {
        return s_minWaitPeriodSeconds;
    }

    /**
     * @notice Gets the list of addresses being watched
     */
    function getWatchList() external view returns (address[] memory) {
        return s_watchList;
    }

    /**
     * @notice Gets configuration information for an address on the watchlist
     */
    function getAccountInfo(address targetAddress)
        external
        view
        returns (
            bool isActive,
            uint96 minBalanceWei,
            uint96 topUpAmountWei,
            uint56 lastTopUpTimestamp
        )
    {
        Target memory target = s_targets[targetAddress];
        return (
            target.isActive,
            target.minBalanceWei,
            target.topUpAmountWei,
            target.lastTopUpTimestamp
        );
    }

    /**
     * @notice Pauses the contract, which prevents executing performUpkeep
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpauses the contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    modifier onlyKeeperRegistry() {
        if (msg.sender != s_keeperRegistryAddress) {
            revert OnlyKeeperRegistry();
        }
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ConfirmedOwnerWithProposal.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwner is ConfirmedOwnerWithProposal {
  constructor(address newOwner) ConfirmedOwnerWithProposal(newOwner, address(0)) {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface KeeperCompatibleInterface {
  /**
   * @notice method that is simulated by the keepers to see if any work actually
   * needs to be performed. This method does does not actually need to be
   * executable, and since it is only ever simulated it can consume lots of gas.
   * @dev To ensure that it is never called, you may want to add the
   * cannotExecute modifier from KeeperBase to your implementation of this
   * method.
   * @param checkData specified in the upkeep registration so it is always the
   * same for a registered upkeep. This can easily be broken down into specific
   * arguments using `abi.decode`, so multiple upkeeps can be registered on the
   * same contract and easily differentiated by the contract.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if
   * upkeep is needed. If you would like to encode data to decode later, try
   * `abi.encode`.
   */
  function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);

  /**
   * @notice method that is actually executed by the keepers, via the registry.
   * The data returned by the checkUpkeep simulation will be passed into
   * this method to actually be executed.
   * @dev The input to this method should not be trusted, and the caller of the
   * method should not even be restricted to any single registry. Anyone should
   * be able call it, and the input should be validated, there is no guarantee
   * that the data passed in is the performData returned from checkUpkeep. This
   * could happen due to malicious keepers, racing keepers, or simply a state
   * change while the performUpkeep transaction is waiting for confirmation.
   * Always validate the data passed in.
   * @param performData is the data which was passed back from the checkData
   * simulation. If it is encoded, it can easily be decoded into other types by
   * calling `abi.decode`. This data should not be trusted, and should be
   * validated against the contract's current state.
   */
  function performUpkeep(bytes calldata performData) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/OwnableInterface.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwnerWithProposal is OwnableInterface {
  address private s_owner;
  address private s_pendingOwner;

  event OwnershipTransferRequested(address indexed from, address indexed to);
  event OwnershipTransferred(address indexed from, address indexed to);

  constructor(address newOwner, address pendingOwner) {
    require(newOwner != address(0), "Cannot set owner to zero");

    s_owner = newOwner;
    if (pendingOwner != address(0)) {
      _transferOwnership(pendingOwner);
    }
  }

  /**
   * @notice Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address to) public override onlyOwner {
    _transferOwnership(to);
  }

  /**
   * @notice Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership() external override {
    require(msg.sender == s_pendingOwner, "Must be proposed owner");

    address oldOwner = s_owner;
    s_owner = msg.sender;
    s_pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /**
   * @notice Get the current owner
   */
  function owner() public view override returns (address) {
    return s_owner;
  }

  /**
   * @notice validate, transfer ownership, and emit relevant events
   */
  function _transferOwnership(address to) private {
    require(to != msg.sender, "Cannot transfer to self");

    s_pendingOwner = to;

    emit OwnershipTransferRequested(s_owner, to);
  }

  /**
   * @notice validate access
   */
  function _validateOwnership() internal view {
    require(msg.sender == s_owner, "Only callable by owner");
  }

  /**
   * @notice Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    _validateOwnership();
    _;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface OwnableInterface {
  function owner() external returns (address);

  function transferOwnership(address recipient) external;

  function acceptOwnership() external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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,"name":"setWatchList","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"needsFunding","type":"address[]"}],"name":"topUp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address payable","name":"payee","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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