/**
   *       .
   *      / \
   *     |.'.|
   *     |'.'|
   *   ,'|   |'.
   *  |,-'-|-'-.|
   *   __|_| |         _        _      _____           _
   *  | ___ \|        | |      | |    | ___ \         | |
   *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
   *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
   *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
   *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
   * +---------------------------------------------------+
   * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
   * +---------------------------------------------------+
   *
   *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
   *  be community-owned, decentralised, permissionless, & trustless.
   *
   *  For more information about Rocket Pool, visit https://rocketpool.net
   *
   *  Authored by the Rocket Pool Core Team
   *  Contributors: https://github.com/rocket-pool/rocketpool/graphs/contributors
   *  A special thanks to the Rocket Pool community for all their contributions.
   *
   */

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.30;

import {RocketStorageInterface} from "../../interface/RocketStorageInterface.sol";
import {RocketMegapoolDelegateBaseInterface} from "../../interface/megapool/RocketMegapoolDelegateBaseInterface.sol";
import {RocketMegapoolProxyInterface} from "../../interface/megapool/RocketMegapoolProxyInterface.sol";
import {RocketMegapoolStorageLayout} from "./RocketMegapoolStorageLayout.sol";

/// @notice Contains the initialisation and delegate upgrade logic for megapools.
///         All other calls are delegated to the node operator's current delegate or optionally the latest.
contract RocketMegapoolProxy is RocketMegapoolProxyInterface, RocketMegapoolStorageLayout {
    // Events
    event EtherReceived(address indexed from, uint256 amount, uint256 time);
    event DelegateUpgraded(address oldDelegate, address newDelegate, uint256 time);
    event UseLatestUpdated(bool state, uint256 time);

    // Immutables
    address immutable private self;
    RocketStorageInterface immutable private rocketStorage;

    // Construct
    constructor (RocketStorageInterface _rocketStorage) {
        self = address(this);
        rocketStorage = _rocketStorage;
    }

    /// @dev Prevent direct calls to this contract
    modifier notSelf() {
        require(address(this) != self);
        _;
    }

    /// @dev Only allow access from the owning node address
    modifier onlyMegapoolOwner() {
        // 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");
        _;
    }

    /// @notice Sets up the initial delegate
    /// @param _nodeAddress The owner of this megapool
    function initialise(address _nodeAddress) external override notSelf {
        // Check input
        require(_nodeAddress != address(0), "Invalid node address");
        require(!storageState, "Already initialised");
        // Flag storage state as initialised and record node address
        storageState = true;
        nodeAddress = _nodeAddress;
        // Set the current delegate (checking it exists)
        address delegateAddress = getContractAddress("rocketMegapoolDelegate");
        require(contractExists(delegateAddress), "Delegate contract does not exist");
        rocketMegapoolDelegate = delegateAddress;
    }

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

    /// @notice Delegates all other calls to megapool delegate contract (or latest if flag is set)
    /// @param _input Transaction calldata that is passed directly to the delegate
    fallback(bytes calldata _input) external payable notSelf returns (bytes memory) {
        address delegateContract;
        // If useLatestDelegate is set, use the latest delegate contract otherwise use stored and check expiry
        if (useLatestDelegate) {
            delegateContract = getContractAddress("rocketMegapoolDelegate");
        } else {
            // Force delegate upgrade on expiry
            if (getDelegateExpired()) {
                _delegateUpgrade();
            }
            delegateContract = rocketMegapoolDelegate;
        }
        // Check for contract existence
        require(contractExists(delegateContract), "Delegate contract does not exist");
        // Execute delegatecall on the delegate contract
        (bool success, bytes memory data) = delegateContract.delegatecall(_input);
        if (!success) {
            revert(getRevertMessage(data));
        }
        return data;
    }

    /// @notice Upgrade this megapool to the latest network delegate contract
    function delegateUpgrade() public override notSelf {
        // Only owner can upgrade if delegate hasn't expired
        if (!getDelegateExpired()) {
            address withdrawalAddress = rocketStorage.getNodeWithdrawalAddress(nodeAddress);
            require(msg.sender == nodeAddress || msg.sender == withdrawalAddress, "Only the node operator can access this method");
        }
        // Perform upgrade
        _delegateUpgrade();
    }

    /// @dev Internal implementation of delegate upgrade
    function _delegateUpgrade() internal {
        // Only succeed if there is a new delegate to upgrade to
        address oldDelegate = rocketMegapoolDelegate;
        address newDelegate = getContractAddress("rocketMegapoolDelegate");
        require(oldDelegate != newDelegate, "Already using latest");
        // Set new delegate
        rocketMegapoolDelegate = newDelegate;
        // Log event
        emit DelegateUpgraded(oldDelegate, newDelegate, block.timestamp);
    }

    /// @notice Sets the flag to automatically use the latest delegate contract or not
    /// @param _state If true, will always use the latest delegate contract
    function setUseLatestDelegate(bool _state) external override onlyMegapoolOwner notSelf {
        // Prevent modification if already set to desired state
        require(useLatestDelegate != _state, "Already set");
        // Update state
        useLatestDelegate = _state;
        // Log event
        emit UseLatestUpdated(_state, block.timestamp);
        if (!_state) {
            // Upon disabling use latest, set their current delegate to the latest
            address newDelegate = getContractAddress("rocketMegapoolDelegate");
            if (newDelegate != rocketMegapoolDelegate) {
                delegateUpgrade();
            }
        }
    }

    /// @notice Returns true if this megapool always uses the latest delegate contract
    function getUseLatestDelegate() external override view returns (bool) {
        return useLatestDelegate;
    }

    /// @notice Returns the address of the megapool's stored delegate
    function getDelegate() external override view returns (address) {
        return rocketMegapoolDelegate;
    }

    /// @notice Returns the delegate which will be used when calling this megapool taking into account
    ///         useLatestDelegate setting and expired delegate
    function getEffectiveDelegate() external override view returns (address) {
        if (useLatestDelegate || getDelegateExpired()) {
            return getContractAddress("rocketMegapoolDelegate");
        }
        return rocketMegapoolDelegate;
    }

    /// @notice Returns true if the megapools current delegate has expired
    function getDelegateExpired() public view returns (bool) {
        RocketMegapoolDelegateBaseInterface megapoolDelegate = RocketMegapoolDelegateBaseInterface(rocketMegapoolDelegate);
        uint256 expiry = megapoolDelegate.getExpirationTime();
        return expiry != 0 && block.timestamp >= expiry;
    }

    /// @dev 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;
    }

    /// @dev 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));
    }

    /// @dev 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 view returns (bool) {
        uint32 codeSize;
        assembly {
            codeSize := extcodesize(_contractAddress)
        }
        return codeSize > 0;
    }

}

/**
   *       .
   *      / \
   *     |.'.|
   *     |'.'|
   *   ,'|   |'.
   *  |,-'-|-'-.|
   *   __|_| |         _        _      _____           _
   *  | ___ \|        | |      | |    | ___ \         | |
   *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
   *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
   *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
   *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
   * +---------------------------------------------------+
   * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
   * +---------------------------------------------------+
   *
   *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
   *  be community-owned, decentralised, permissionless, & trustless.
   *
   *  For more information about Rocket Pool, visit https://rocketpool.net
   *
   *  Authored by the Rocket Pool Core Team
   *  Contributors: https://github.com/rocket-pool/rocketpool/graphs/contributors
   *  A special thanks to the Rocket Pool community for all their contributions.
   *
   */

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >0.5.0 <0.9.0;

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    |
   * +---------------------------------------------------+
   *
   *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
   *  be community-owned, decentralised, permissionless, & trustless.
   *
   *  For more information about Rocket Pool, visit https://rocketpool.net
   *
   *  Authored by the Rocket Pool Core Team
   *  Contributors: https://github.com/rocket-pool/rocketpool/graphs/contributors
   *  A special thanks to the Rocket Pool community for all their contributions.
   *
   */

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >0.5.0 <0.9.0;

import "../../interface/RocketStorageInterface.sol";

interface RocketMegapoolDelegateBaseInterface {
    function deprecate() external;
    function getExpirationTime() external view returns (uint256);
}

/**
   *       .
   *      / \
   *     |.'.|
   *     |'.'|
   *   ,'|   |'.
   *  |,-'-|-'-.|
   *   __|_| |         _        _      _____           _
   *  | ___ \|        | |      | |    | ___ \         | |
   *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
   *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
   *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
   *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
   * +---------------------------------------------------+
   * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
   * +---------------------------------------------------+
   *
   *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
   *  be community-owned, decentralised, permissionless, & trustless.
   *
   *  For more information about Rocket Pool, visit https://rocketpool.net
   *
   *  Authored by the Rocket Pool Core Team
   *  Contributors: https://github.com/rocket-pool/rocketpool/graphs/contributors
   *  A special thanks to the Rocket Pool community for all their contributions.
   *
   */

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >0.5.0 <0.9.0;

import "../../interface/RocketStorageInterface.sol";

interface RocketMegapoolProxyInterface {
    function initialise(address _nodeAddress) external;
    function delegateUpgrade() external;
    function setUseLatestDelegate(bool _state) external;
    function getUseLatestDelegate() external view returns (bool);
    function getDelegate() external view returns (address);
    function getEffectiveDelegate() external view returns (address);
    function getDelegateExpired() external view returns (bool);
}

/**
   *       .
   *      / \
   *     |.'.|
   *     |'.'|
   *   ,'|   |'.
   *  |,-'-|-'-.|
   *   __|_| |         _        _      _____           _
   *  | ___ \|        | |      | |    | ___ \         | |
   *  | |_/ /|__   ___| | _____| |_   | |_/ /__   ___ | |
   *  |    // _ \ / __| |/ / _ \ __|  |  __/ _ \ / _ \| |
   *  | |\ \ (_) | (__|   <  __/ |_   | | | (_) | (_) | |
   *  \_| \_\___/ \___|_|\_\___|\__|  \_|  \___/ \___/|_|
   * +---------------------------------------------------+
   * |    DECENTRALISED STAKING PROTOCOL FOR ETHEREUM    |
   * +---------------------------------------------------+
   *
   *  Rocket Pool is a first-of-its-kind Ethereum staking pool protocol, designed to
   *  be community-owned, decentralised, permissionless, & trustless.
   *
   *  For more information about Rocket Pool, visit https://rocketpool.net
   *
   *  Authored by the Rocket Pool Core Team
   *  Contributors: https://github.com/rocket-pool/rocketpool/graphs/contributors
   *  A special thanks to the Rocket Pool community for all their contributions.
   *
   */

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.30;

import {RocketStorageInterface} from "../../interface/RocketStorageInterface.sol";

// ******************************************************
// Note: This contract MUST only be appended to. All
// deployed megapool contracts must maintain a
// consistent storage layout with RocketMegapoolDelegate.
// ******************************************************

/// @dev The RocketMegapool contract storage layout, shared by RocketMegapoolDelegate and RocketMegapoolBase
abstract contract RocketMegapoolStorageLayout {
    // Status of individual validators
    enum Status {
        InQueue,
        PreStaked,
        Staking,
        Exited,
        Dissolved
    }

    // Information about individual validators
    struct ValidatorInfo {
        uint32 lastAssignmentTime;  // Timestamp of when the last fund assignment took place
        uint32 lastRequestedValue;  // Value in milliether last requested
        uint32 lastRequestedBond;   // Value in milliether of the bond supplied for last request for funds
        uint32 depositValue;        // Total amount deposited to beaconchain in gwei

        bool staked;        // Whether the validator has staked the minimum required to begin validating (32 ETH)
        bool exited;        // Whether the validator has exited the beacon chain
        bool inQueue;       // Whether the validator is currently awaiting funds from the deposit pool
        bool inPrestake;    // Whether the validator is currently awaiting the stake operation
        bool expressUsed;   // Whether the last request for funds consumed an express ticket
        bool dissolved;     // Whether the validator failed to prestake their initial deposit in time
        bool exiting;       // Whether the validator is queued to exit on the beaconchain
        bool locked;        // Whether the validator has been locked by the oDAO for not exiting

        uint64 exitBalance;         // Final balance of the validator at withdrawable_epoch in gwei (amount returned to EL)
        uint64 lockedTime;          // The slot this validator was challenged about its exit status
    }

    //
    // Delegate state
    //

    bool internal storageState;           // Used to prevent direct calls to the delegate contract
    uint256 internal expirationTime;      // Used to store the expiry timestamp of this delegate (0 meaning not expiring)

    //
    // Proxy state
    //

    address internal rocketMegapoolDelegate;  // The current delegate contract address
    bool internal useLatestDelegate;          // Whether this proxy always uses the latest delegate

    //
    // Megapool state
    //

    address internal nodeAddress;             // Megapool owner
    uint32 internal numValidators;            // Number of individual validators handled by this megapool
    uint32 internal numInactiveValidators;    // Number of validators that are no longer contributing to bond requirement

    uint256 internal assignedValue;   // ETH assigned from DP pending prestake/stake
    uint256 internal refundValue;     // ETH refunded to the owner after a dissolution

    uint256 internal nodeBond;              // Value of node ETH bond (including value yet to be assigned/deposited)
    uint256 internal userCapital;           // Value of user supplied capital (including value yet to be assigned/deposited)
    uint256 internal nodeQueuedBond;        // Value of node ETH bond (yet to be assigned/deposited to beacon chain)
    uint256 internal userQueuedCapital;     // Value of user supplied capital (yet to be assigned/deposited to beacon chain)

    uint256 internal debt;            // Amount the owner owes the DP

    uint256 internal lastDistributionTime; // The block of the last time a distribution of rewards was executed

    mapping(uint32 => ValidatorInfo) internal validators;
    mapping(uint32 => bytes) internal prestakeSignatures;
    mapping(uint32 => bytes) internal pubkeys;

    uint32 internal numLockedValidators;        // Number of validators currently locked
    uint32 internal numExitingValidators;       // Number of validators currently exiting

    uint256 internal __version1Boundary;        // Unused full slot width boundary
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 15000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

[{"inputs":[{"internalType":"contract RocketStorageInterface","name":"_rocketStorage","type":"address"}],"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":"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"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"state","type":"bool"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"UseLatestUpdated","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"delegateUpgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getDelegate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDelegateExpired","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getEffectiveDelegate","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":"address","name":"_nodeAddress","type":"address"}],"name":"initialise","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_state","type":"bool"}],"name":"setUseLatestDelegate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]