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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IToken.sol";
import "./interfaces/IReferral.sol";
import "./interfaces/IManager.sol";

contract Staking is ReentrancyGuard {
    IManager private Manager;
    IToken private Token;
    IReferral private Referral;

    uint256 private depositFee = 0;

    uint256 public epochDuration = 6 hours;
    uint256 public fullDistributionEpochs = 28; // 28 * 6 hours = 7 days
    uint256 private genesisEpochTime;
    bool private isStarted = false;

    uint256 public totalFueledToken = 0;
    uint256 public multiplier;

    struct Ticket {
        uint256 id;
        uint256 baseAmount;
        uint256 baseRedeemed;
        uint256 boostAmount;
        uint256 boostRedeemed;
        uint256 creationEpoch;
    }

    struct Epoch {
        uint256 epoch;
        bool initialized;
        uint256 totalStaked;
    }

    mapping(address => Ticket[]) public tickets;
    mapping(uint256 => Epoch) public epochs;
    mapping(address => uint256) public pendingReferralRewards;

    //--------------------------------------------------//

    constructor(address _manager) {
        Manager = IManager(_manager);
    }

    //--------------------------------------------------//

    modifier onlyOwner() {
        require(
            msg.sender == Manager.owner(),
            "Only owner can call this function"
        );
        _;
    }

    //--------------------------------------------------//

    function setFees(uint256 _depositFee) external onlyOwner {
        require(_depositFee < 100, "Fees too high");
        depositFee = _depositFee;
    }

    function setEpochDuration(uint256 _epochDuration) external onlyOwner {
        epochDuration = _epochDuration;
    }

    function setFullDistributionEpochs(
        uint256 _fullDistributionEpochs
    ) external onlyOwner {
        fullDistributionEpochs = _fullDistributionEpochs;
    }

    function startEpoch() external onlyOwner {
        require(!isStarted, "Epoch already started");
        genesisEpochTime = block.timestamp;
        epochs[0] = Epoch(0, true, 0);
        isStarted = true;
    }

    function setAll() external onlyOwner {
        Token = IToken(_getContract("Token"));
        Referral = IReferral(_getContract("Referral"));
    }

    function setManager(address _manager) external onlyOwner {
        Manager = IManager(_manager);
    }

    //--------------------------------------------------//

    function deposit(uint256 amount, uint8 rate) external nonReentrant {
        _deposit(msg.sender, amount, rate);
    }

    function claim(uint256 id) external nonReentrant {
        address sender = msg.sender;
        uint256 _rewards = _claim(sender, id);

        Token.mint(sender, _rewards);
    }

    function batchClaim(uint256[] memory ids) external nonReentrant {
        address sender = msg.sender;
        uint256 _rewards = 0;
        for (uint256 i = 0; i < ids.length; i++) {
            _rewards += _claim(sender, ids[i]);
        }
        Token.mint(sender, _rewards);
    }

    function claimAll() external nonReentrant {
        address sender = msg.sender;
        uint256 _rewards = 0;
        for (uint256 i = 0; i < tickets[sender].length; i++) {
            _rewards += _claim(sender, i);
        }
        Token.mint(sender, _rewards);
    }

    function claimReferralRewards() external nonReentrant {
        address sender = msg.sender;
        uint256 availableRewards = pendingReferralRewards[sender];
        require(availableRewards > 0, "Nothing to claim");
        pendingReferralRewards[sender] = 0;

        Token.mint(sender, availableRewards);
    }

    //--------------------------------------------------//

    function _redeemCalculator(
        address user,
        uint256 id
    ) private view returns (uint256, uint256) {
        uint256 currentEpoch = _getEpoch();
        Ticket memory ticket = tickets[user][id];

        uint256 _fullDistributionEpochs = fullDistributionEpochs;
        uint256 epochsPassed = currentEpoch - ticket.creationEpoch;
        epochsPassed = epochsPassed > _fullDistributionEpochs
            ? _fullDistributionEpochs
            : epochsPassed;

        uint256 amountToRedeemWithMultiplier = ((ticket.boostAmount *
            epochsPassed) / _fullDistributionEpochs) - ticket.boostRedeemed;
        uint256 amountToRedeem = ((ticket.baseAmount * epochsPassed) /
            _fullDistributionEpochs) - ticket.baseRedeemed;

        return (amountToRedeem, amountToRedeemWithMultiplier);
    }

    function nextEpochRedeemForUserCalculator(
        address user,
        uint256 id
    ) public view returns (uint256) {
        Ticket memory ticket = tickets[user][id];
        uint256 amountToRedeem = ((ticket.boostAmount * 1) /
            fullDistributionEpochs) - ticket.boostRedeemed;

        return amountToRedeem;
    }

    function _getEpoch() internal view returns (uint256) {
        return (block.timestamp - genesisEpochTime) / epochDuration;
    }

    function getNextEpoch() public view returns (uint256) {
        return genesisEpochTime + (_getEpoch() + 1) * epochDuration;
    }

    //--------------------------------------------------//

    function _deposit(address user, uint256 amount, uint8 rate) private {
        require(isStarted, "Epoch not started");
        require(rate == 0 || rate == 1, "Invalid rate");
        uint256 currentEpoch = _getEpoch();
        uint256 amountAfterFee = amount;

        uint256 fee;
        unchecked {
            fee = (amount * depositFee) / 100;
            amountAfterFee = amount - fee;
        }
        totalFueledToken += amountAfterFee;
        Token.burnFrom(user, amount);

        if (fee > 0) {
            Token.transfer(address(Token), fee);
        }

        tickets[user].push(
            Ticket(
                tickets[user].length,
                amountAfterFee,
                0,
                (amountAfterFee * multiplier) / 1e18,
                0,
                currentEpoch
            )
        );
    }

    function _claim(address user, uint256 id) private returns (uint256) {
        (uint256 base, uint256 boost) = _redeemCalculator(user, id);
        if (base == 0) {
            return 0;
        }

        if (Referral.getReferrer(user) != address(0)) {
            uint256 referralRewards = (boost * 5) / 100;
            pendingReferralRewards[
                Referral.getReferrer(user)
            ] += referralRewards;
        }

        Ticket storage ticket = tickets[user][id];
        ticket.boostRedeemed += boost;
        ticket.baseRedeemed += base;

        totalFueledToken -= base;

        return boost;
    }

    function _updateMultiplier() private {
        uint256 ratio = 3e18 -
            ((totalFueledToken * 2e18) / Token.totalSupply());

        if (ratio < 1e18) {
            ratio = 1e18;
        } else if (ratio > 3e18) {
            ratio = 3e18;
        }

        multiplier = ratio;
    }

    function _getContract(
        string memory contractName
    ) internal view returns (address) {
        return Manager.getContract(contractName);
    }

    //--------------------------------------------------//

    function getCurrentEpoch() external view returns (uint256) {
        return _getEpoch();
    }

    function getUserTotalStaked(address user) external view returns (uint256) {
        uint256 sumToken = 0;
        Ticket[] memory ticket = tickets[user];

        for (uint256 i = 0; i < tickets[user].length; i++) {
            sumToken += ticket[i].baseAmount;
        }

        return sumToken;
    }

    function getTotalRedeemableAmountForUser(
        address user
    ) external view returns (uint256) {
        uint256 sum = 0;

        for (uint256 i = 0; i < tickets[user].length; i++) {
            (, uint256 pendingRedeem) = _redeemCalculator(user, i);
            sum += pendingRedeem;
        }

        return sum;
    }

    function getNextStakingRewardsForAllTicketsForUser(
        address user
    ) external view returns (uint256) {
        uint256 sum = 0;

        for (uint256 i = 0; i < tickets[user].length; i++) {
            sum += nextEpochRedeemForUserCalculator(user, i);
        }

        return sum;
    }

    function getTotalTicketsForUser(
        address user
    ) external view returns (uint256) {
        return tickets[user].length;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// 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;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

interface IManager {
    function getContract(string memory name) external view returns (address);
    function owner() external view returns (address);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

interface IReferral {
    function getUserFromCode(bytes32 code) external view returns (address);
    function getReferrals(address user) external view returns (address[] memory);
    function getTimeOfReferrals(address user) external view returns (uint256[] memory);
    function getReferrer(address user) external view returns (address);
    function rewardsPerReferral() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IToken {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function mint(address to, uint256 value) external;

    function burnFrom(address from, uint256 value) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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