/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity 0.7.6;

// SPDX-License-Identifier: GPL-3.0-only

import "./RocketMinipoolStorageLayout.sol";
import "../../interface/RocketStorageInterface.sol";
import "../../types/MinipoolDeposit.sol";
import "../../types/MinipoolStatus.sol";

// An individual minipool in the Rocket Pool network

contract RocketMinipool is RocketMinipoolStorageLayout {

    // Events
    event EtherReceived(address indexed from, uint256 amount, uint256 time);
    event DelegateUpgraded(address oldDelegate, address newDelegate, uint256 time);
    event DelegateRolledBack(address oldDelegate, address newDelegate, uint256 time);

    // Modifiers

    // Only allow access from the owning node address
    modifier onlyMinipoolOwner() {
        // Only the node operator can upgrade
        address withdrawalAddress = rocketStorage.getNodeWithdrawalAddress(nodeAddress);
        require(msg.sender == nodeAddress || msg.sender == withdrawalAddress, "Only the node operator can access this method");
        _;
    }

    // Construct
    constructor(RocketStorageInterface _rocketStorageAddress, address _nodeAddress, MinipoolDeposit _depositType) {
        // Initialise RocketStorage
        require(address(_rocketStorageAddress) != address(0x0), "Invalid storage address");
        rocketStorage = RocketStorageInterface(_rocketStorageAddress);
        // Set storage state to uninitialised
        storageState = StorageState.Uninitialised;
        // Set the current delegate
        address delegateAddress = getContractAddress("rocketMinipoolDelegate");
        rocketMinipoolDelegate = delegateAddress;
        // Check for contract existence
        require(contractExists(delegateAddress), "Delegate contract does not exist");
        // Call initialise on delegate
        (bool success, bytes memory data) = delegateAddress.delegatecall(abi.encodeWithSignature('initialise(address,uint8)', _nodeAddress, uint8(_depositType)));
        if (!success) { revert(getRevertMessage(data)); }
    }

    // Receive an ETH deposit
    receive() external payable {
        // Emit ether received event
        emit EtherReceived(msg.sender, msg.value, block.timestamp);
    }

    // Upgrade this minipool to the latest network delegate contract
    function delegateUpgrade() external onlyMinipoolOwner {
        // Set previous address
        rocketMinipoolDelegatePrev = rocketMinipoolDelegate;
        // Set new delegate
        rocketMinipoolDelegate = getContractAddress("rocketMinipoolDelegate");
        // Verify
        require(rocketMinipoolDelegate != rocketMinipoolDelegatePrev, "New delegate is the same as the existing one");
        // Log event
        emit DelegateUpgraded(rocketMinipoolDelegatePrev, rocketMinipoolDelegate, block.timestamp);
    }

    // Rollback to previous delegate contract
    function delegateRollback() external onlyMinipoolOwner {
        // Make sure they have upgraded before
        require(rocketMinipoolDelegatePrev != address(0x0), "Previous delegate contract is not set");
        // Store original
        address originalDelegate = rocketMinipoolDelegate;
        // Update delegate to previous and zero out previous
        rocketMinipoolDelegate = rocketMinipoolDelegatePrev;
        rocketMinipoolDelegatePrev = address(0x0);
        // Log event
        emit DelegateRolledBack(originalDelegate, rocketMinipoolDelegate, block.timestamp);
    }

    // If set to true, will automatically use the latest delegate contract
    function setUseLatestDelegate(bool _setting) external onlyMinipoolOwner {
        useLatestDelegate = _setting;
    }

    // Getter for useLatestDelegate setting
    function getUseLatestDelegate() external view returns (bool) {
        return useLatestDelegate;
    }

    // Returns the address of the minipool's stored delegate
    function getDelegate() external view returns (address) {
        return rocketMinipoolDelegate;
    }

    // Returns the address of the minipool's previous delegate (or address(0) if not set)
    function getPreviousDelegate() external view returns (address) {
        return rocketMinipoolDelegatePrev;
    }

    // Returns the delegate which will be used when calling this minipool taking into account useLatestDelegate setting
    function getEffectiveDelegate() external view returns (address) {
        return useLatestDelegate ? getContractAddress("rocketMinipoolDelegate") : rocketMinipoolDelegate;
    }

    // Delegate all other calls to minipool delegate contract
    fallback(bytes calldata _input) external payable returns (bytes memory) {
        // If useLatestDelegate is set, use the latest delegate contract
        address delegateContract = useLatestDelegate ? getContractAddress("rocketMinipoolDelegate") : rocketMinipoolDelegate;
        // Check for contract existence
        require(contractExists(delegateContract), "Delegate contract does not exist");
        // Execute delegatecall
        (bool success, bytes memory data) = delegateContract.delegatecall(_input);
        if (!success) { revert(getRevertMessage(data)); }
        return data;
    }

    // Get the address of a Rocket Pool network contract
    function getContractAddress(string memory _contractName) private view returns (address) {
        address contractAddress = rocketStorage.getAddress(keccak256(abi.encodePacked("contract.address", _contractName)));
        require(contractAddress != address(0x0), "Contract not found");
        return contractAddress;
    }

    // Get a revert message from delegatecall return data
    function getRevertMessage(bytes memory _returnData) private pure returns (string memory) {
        if (_returnData.length < 68) { return "Transaction reverted silently"; }
        assembly {
            _returnData := add(_returnData, 0x04)
        }
        return abi.decode(_returnData, (string));
    }

    // Returns true if contract exists at _contractAddress (if called during that contract's construction it will return a false negative)
    function contractExists(address _contractAddress) private returns (bool) {
        uint32 codeSize;
        assembly {
            codeSize := extcodesize(_contractAddress)
        }
        return codeSize > 0;
    }
}

/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity 0.7.6;

// SPDX-License-Identifier: GPL-3.0-only

import "../../interface/RocketStorageInterface.sol";
import "../../types/MinipoolDeposit.sol";
import "../../types/MinipoolStatus.sol";

// The RocketMinipool contract storage layout, shared by RocketMinipoolDelegate

// ******************************************************
// Note: This contract MUST NOT BE UPDATED after launch.
// All deployed minipool contracts must maintain a
// Consistent storage layout with RocketMinipoolDelegate.
// ******************************************************

abstract contract RocketMinipoolStorageLayout {
    // Storage state enum
    enum StorageState {
        Undefined,
        Uninitialised,
        Initialised
    }

	// Main Rocket Pool storage contract
    RocketStorageInterface internal rocketStorage = RocketStorageInterface(0);

    // Status
    MinipoolStatus internal status;
    uint256 internal statusBlock;
    uint256 internal statusTime;
    uint256 internal withdrawalBlock;

    // Deposit type
    MinipoolDeposit internal depositType;

    // Node details
    address internal nodeAddress;
    uint256 internal nodeFee;
    uint256 internal nodeDepositBalance;
    bool internal nodeDepositAssigned;
    uint256 internal nodeRefundBalance;
    uint256 internal nodeSlashBalance;

    // User deposit details
    uint256 internal userDepositBalance;
    uint256 internal userDepositAssignedTime;

    // Upgrade options
    bool internal useLatestDelegate = false;
    address internal rocketMinipoolDelegate;
    address internal rocketMinipoolDelegatePrev;

    // Local copy of RETH address
    address internal rocketTokenRETH;

    // Local copy of penalty contract
    address internal rocketMinipoolPenalty;

    // Used to prevent direct access to delegate and prevent calling initialise more than once
    StorageState storageState = StorageState.Undefined;

    // Whether node operator has finalised the pool
    bool internal finalised;

    // Trusted member scrub votes
    mapping(address => bool) memberScrubVotes;
    uint256 totalScrubVotes;
}

/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity 0.7.6;

// SPDX-License-Identifier: GPL-3.0-only

interface RocketStorageInterface {

    // Deploy status
    function getDeployedStatus() external view returns (bool);

    // Guardian
    function getGuardian() external view returns(address);
    function setGuardian(address _newAddress) external;
    function confirmGuardian() external;

    // Getters
    function getAddress(bytes32 _key) external view returns (address);
    function getUint(bytes32 _key) external view returns (uint);
    function getString(bytes32 _key) external view returns (string memory);
    function getBytes(bytes32 _key) external view returns (bytes memory);
    function getBool(bytes32 _key) external view returns (bool);
    function getInt(bytes32 _key) external view returns (int);
    function getBytes32(bytes32 _key) external view returns (bytes32);

    // Setters
    function setAddress(bytes32 _key, address _value) external;
    function setUint(bytes32 _key, uint _value) external;
    function setString(bytes32 _key, string calldata _value) external;
    function setBytes(bytes32 _key, bytes calldata _value) external;
    function setBool(bytes32 _key, bool _value) external;
    function setInt(bytes32 _key, int _value) external;
    function setBytes32(bytes32 _key, bytes32 _value) external;

    // Deleters
    function deleteAddress(bytes32 _key) external;
    function deleteUint(bytes32 _key) external;
    function deleteString(bytes32 _key) external;
    function deleteBytes(bytes32 _key) external;
    function deleteBool(bytes32 _key) external;
    function deleteInt(bytes32 _key) external;
    function deleteBytes32(bytes32 _key) external;

    // Arithmetic
    function addUint(bytes32 _key, uint256 _amount) external;
    function subUint(bytes32 _key, uint256 _amount) external;

    // Protected storage
    function getNodeWithdrawalAddress(address _nodeAddress) external view returns (address);
    function getNodePendingWithdrawalAddress(address _nodeAddress) external view returns (address);
    function setWithdrawalAddress(address _nodeAddress, address _newWithdrawalAddress, bool _confirm) external;
    function confirmWithdrawalAddress(address _nodeAddress) external;
}

/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity 0.7.6;

// SPDX-License-Identifier: GPL-3.0-only

// Represents the type of deposits required by a minipool

enum MinipoolDeposit {
    None,    // Marks an invalid deposit type
    Full,    // The minipool requires 32 ETH from the node operator, 16 ETH of which will be refinanced from user deposits
    Half,    // The minipool required 16 ETH from the node operator to be matched with 16 ETH from user deposits
    Empty    // The minipool requires 0 ETH from the node operator to be matched with 32 ETH from user deposits (trusted nodes only)
}

/**
  *       .
  *      / \
  *     |.'.|
  *     |'.'|
  *   ,'|   |`.
  *  |,-'-|-'-.|
  *   __|_| |         _        _      _____           _
  *  | ___ \|        | |      | |    | ___ \         | |
  *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
  *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
  *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
  *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
  * +---------------------------------------------------+
  * |  DECENTRALISED STAKING PROTOCOL FOR ETHEREUM 2.0  |
  * +---------------------------------------------------+
  *
  *  Rocket Pool is a first-of-its-kind ETH2 Proof of Stake protocol, designed to be community owned,
  *  decentralised, trustless and compatible with staking in Ethereum 2.0.
  *
  *  For more information about Rocket Pool, visit https://rocketpool.net
  *
  *  Authors: David Rugendyke, Jake Pospischil, Kane Wallmann, Darren Langley, Joe Clapis, Nick Doherty
  *
  */

pragma solidity 0.7.6;

// SPDX-License-Identifier: GPL-3.0-only

// Represents a minipool's status within the network

enum MinipoolStatus {
    Initialised,    // The minipool has been initialised and is awaiting a deposit of user ETH
    Prelaunch,      // The minipool has enough ETH to begin staking and is awaiting launch by the node operator
    Staking,        // The minipool is currently staking
    Withdrawable,   // The minipool has become withdrawable on the beacon chain and can be withdrawn from by the node operator
    Dissolved       // The minipool has been dissolved and its user deposited ETH has been returned to the deposit pool
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 15000
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract RocketStorageInterface","name":"_rocketStorageAddress","type":"address"},{"internalType":"address","name":"_nodeAddress","type":"address"},{"internalType":"enum MinipoolDeposit","name":"_depositType","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldDelegate","type":"address"},{"indexed":false,"internalType":"address","name":"newDelegate","type":"address"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"DelegateRolledBack","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldDelegate","type":"address"},{"indexed":false,"internalType":"address","name":"newDelegate","type":"address"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"DelegateUpgraded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"EtherReceived","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"delegateRollback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"delegateUpgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getDelegate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getEffectiveDelegate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPreviousDelegate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getUseLatestDelegate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_setting","type":"bool"}],"name":"setUseLatestDelegate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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