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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.27;

import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

interface IMintableERC20 {
    function mint(address to, uint256 amount) external;
    function transfer(address to, uint256 amount) external;
    function totalSupply() external view returns(uint256);
}

interface IAddressBook {
    function addressVerifiedUntil(
        address account
    ) external view returns (uint256 timestamp);
}

interface IStaking {
    function getStakedBalance(address wallet) external view returns (uint256);
}

contract Referral is ReentrancyGuard, Pausable, Ownable {
    // -------------------------
    // Errors (cheaper than strings)
    // -------------------------
    error IndexOutOfBounds();
    error InviterNotRegistered();
    error AlreadyRegistered();
    error NoPendingReward();
    error NotVerifiedAccount();
    error ZeroAddressToken();
    error SelfRegisterDetected();

    // -------------------------
    // Events
    // -------------------------
    event Registered(
        address indexed user,
        address indexed inviter,
        uint256 userId,
        uint256 inviterId,
        uint256 userReward,
        uint256 inviterRewardAccrued
    );

    event RewardClaimed(address indexed user, uint256 amount);
    event RewardAccrued(
        address indexed inviter,
        uint256 amount,
        uint256 totalUnclaimed
    );

    // -------------------------
    // Config
    // -------------------------
    IMintableERC20 public immutable rewardToken;
    IStaking public immutable staking;

    address public constant ADDRESS_BOOK =
        0x57b930D551e677CC36e2fA036Ae2fe8FdaE0330D;
    uint256 public constant REGISTER_REWARD = 5 ether; // 5 tokens (assumes 18 decimals)
    uint256 public constant INVITER_REWARD = 2.5 ether;

    // -------------------------
    // Storage
    // -------------------------
    struct InviterStats {
        uint128 inviteCount; // packs well
        uint256 unclaimedRewards; // keep as uint256
    }

    address[] private _users; // userId => address
    mapping(address => bool) public isUser; // address => registered?
    mapping(address => uint256) public userId; // address => id
    mapping(address => InviterStats) public inviterStats;

    constructor(
        address _initialOwner,
        address _token,
        address _staking
    ) Ownable(_initialOwner) {
        if (_token == address(0)) revert ZeroAddressToken();
        rewardToken = IMintableERC20(_token);
        staking = IStaking(_staking);

        // Register owner as user #0
        _users.push(_initialOwner);
        isUser[_initialOwner] = true;
        userId[_initialOwner] = 0;
    }

    // -------------------------
    // Views
    // -------------------------
    function usersCount() external view returns (uint256) {
        return _users.length;
    }

    function userAt(uint256 id) external view returns (address) {
        if (id >= _users.length) revert IndexOutOfBounds();
        return _users[id];
    }

    function getInviteId(
        address account
    ) external view returns (bool registered, uint256 id) {
        registered = isUser[account];
        if (registered) id = userId[account];
    }

    // reward halves every 2,500,000 tokens minted
    function getRewardDivisor() public view returns(uint256) {
        return (rewardToken.totalSupply() / 2_500_000 ether) + 1;
    }

    // -------------------------
    // Core
    // -------------------------
    function register(uint256 inviterId) external whenNotPaused nonReentrant {
        if (IAddressBook(ADDRESS_BOOK).addressVerifiedUntil(msg.sender) <= 0)
            revert NotVerifiedAccount();
        if (inviterId >= _users.length) revert IndexOutOfBounds();

        address inviter = _users[inviterId];
        if (msg.sender == inviter) revert SelfRegisterDetected();
        if (!isUser[inviter]) revert InviterNotRegistered();
        if (isUser[msg.sender]) revert AlreadyRegistered();

        // Effects: register user first
        uint256 newUserId = _users.length;
        _users.push(msg.sender);
        isUser[msg.sender] = true;
        userId[msg.sender] = newUserId;

        // Accrue inviter reward
        InviterStats storage stats = inviterStats[inviter];
        stats.inviteCount += 1;
        // if inviter is an owner, the reward token will not be minted
        uint256 accrued = 0;
        if (staking.getStakedBalance(inviter) >= 1 ether && inviterId != 0) {
            accrued = INVITER_REWARD / getRewardDivisor();
            stats.unclaimedRewards += accrued;
        }

        emit RewardAccrued(inviter, accrued, stats.unclaimedRewards);

        // Interactions: mint rewards
        uint256 registerReward = REGISTER_REWARD / getRewardDivisor();
        rewardToken.mint(address(this), registerReward);
        rewardToken.transfer(msg.sender, registerReward);

        emit Registered(
            msg.sender,
            inviter,
            newUserId,
            inviterId,
            registerReward,
            accrued
        );
    }

    function claim() external whenNotPaused nonReentrant {
        uint256 amount = inviterStats[msg.sender].unclaimedRewards;
        if (amount == 0) revert NoPendingReward();

        // Effects
        inviterStats[msg.sender].unclaimedRewards = 0;

        // Interactions
        rewardToken.mint(address(this), amount);
        rewardToken.transfer(msg.sender, amount);

        emit RewardClaimed(msg.sender, amount);
    }

    // -------------------------
    // Admin
    // -------------------------
    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

{
  "evmVersion": "cancun",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/"
  ]
}

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IMintableERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"staking","outputs":[{"internalType":"contract IStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"userAt","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"usersCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000c5ea3469ce591ffb8ed55e45f101e02e456ef468000000000000000000000000f4c7a3fc2459bae125593482f04307ff92e9ef94000000000000000000000000aff0998b23ea8239b658531ee96093dc371aaea8

-----Decoded View---------------
Arg [0] : _initialOwner (address): 0xC5EA3469ce591Ffb8ed55E45f101E02e456ef468
Arg [1] : _token (address): 0xf4C7A3Fc2459bAE125593482f04307ff92e9Ef94
Arg [2] : _staking (address): 0xaFf0998b23ea8239B658531ee96093dc371aaea8

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c5ea3469ce591ffb8ed55e45f101e02e456ef468
Arg [1] : 000000000000000000000000f4c7a3fc2459bae125593482f04307ff92e9ef94
Arg [2] : 000000000000000000000000aff0998b23ea8239b658531ee96093dc371aaea8