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// SPDX-License-Identifier: MIT

import "@openzeppelin/contracts/access/Ownable2Step.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "contracts/BellumToken.sol";
import "contracts/BellumNursery.sol";
import "contracts/interfaces/IOwnable.sol";
import "contracts/metropolis/interfaces/IMetropolisRouter.sol";
import "contracts/metropolis/interfaces/IMetropolisFactory.sol";
import "contracts/pharaoh/interfaces/IPharaohRouter.sol";
import "contracts/pharaoh/interfaces/IPharaohFactory.sol";

pragma solidity ^0.8.17;

contract BellumFactory is Ownable2Step, ReentrancyGuard {
  using Address for address payable;
  using SafeERC20 for IERC20;

  // Ecosystem Info
  bool private isPaused;
  address payable public feeReceiver;
  uint256 public migrationFee;
  uint256 public pendingFees;
  uint256 public tradingFee;
  uint256 public createFee;
  uint256 public creatorRewards;
  // Addresses
  address payable public immutable METROPOLIS_ROUTER;
  address payable public immutable SHADOW_ROUTER;
  address private constant DEAD_ADDRESS = address(0xdead);
  // Constants
  uint256 private constant ETHER = 1 ether;
  uint256 private constant BIN_WIDTH = 2000;
  uint256 private constant BASIS = 10000;
  uint256 private constant COEF = 2;
  uint256 private constant MIN_IN = 1 ether;
  uint256 private constant MIN_OUT = 0.2 ether;

  struct Curve {
    uint256[] distribution;
    uint256 percentOfLP; // 5000 = 50%
    uint256 avaxAtLaunch;
  }

  struct Token {
    address creator;
    address pair;
    uint8 curveIndex;
    uint256 currentIndex;
    uint256 currentValue;
    uint256 initialSupply;
    bool hasLaunched;
    Dex dex;
  }

  enum Dex {
    METROPOLIS,
    SHADOW
  }

  address[] public allTokens;
  mapping(address => Token) public tokens;
  mapping(uint8 => Curve) public curves;

  event TokenCreated(
    address indexed token,
    address indexed creator,
    uint curveIndex,
    uint dex
  );

  event CurveCreated(
    uint indexed curveIndex
  );
  
  event BellumSwap(
    address indexed token,
    address indexed sender,
    uint amount0In,
    uint amount0Out,
    uint amount1In,
    uint amount1Out
  );

  event CurveCompleted(
    address indexed token,
    address indexed nursery,
    address indexed pair
  );

  constructor(address msig, address metropolisRouter_, address shadowRouter_) Ownable(msig) {
    require(msig != address(0), "Zero address not allowed for owner");
    require(metropolisRouter_ != address(0), "Zero address not allowed for router");
    require(shadowRouter_ != address(0), "Zero address not allowed for router");
    METROPOLIS_ROUTER = payable(metropolisRouter_);
    SHADOW_ROUTER = payable(shadowRouter_);
    feeReceiver = payable(msig);
    tradingFee = 100; // 1%
    migrationFee = 400;
    createFee = 1 ether;
    creatorRewards = 300; // 3%
  }

  function createToken(
    string memory name_,
    string memory symbol_,
    uint112 totalSupply_,
    uint8 curveIndex_,
    Dex dex
  ) external payable nonReentrant {
    Curve memory curve = curves[curveIndex_];
    uint256 percent = curve.percentOfLP;
    uint256[] memory arr = curve.distribution;
    uint256 createFee_ = createFee;
    require(!isPaused, "Bellum: TOKEN_CREATION_IS_PAUSED");
    require(percent != 0, "Bellum: CURVE_DOES_NOT_EXIST");
    require(totalSupply_ >= 1 ether, "Bellum: TOTAL_SUPPLY_TOO_LOW");
    require(msg.value <= 500 ether + createFee_, "Bellum: TOO_MUCH_ETH");
    require(msg.value >= createFee_, "Bellum: TOO_LITTLE_ETH");
    BellumToken token = new BellumToken(name_, symbol_, totalSupply_);

    address t = address(token);
    allTokens.push(t);
    uint256 supply = uint256(totalSupply_ * percent / BASIS); 

    tokens[t].initialSupply = supply;
    tokens[t].currentValue = supply * arr[0] / BASIS;
    tokens[t].curveIndex = curveIndex_;
    tokens[t].creator = msg.sender;
    tokens[t].dex = dex;
    
    // Create pair initially
    address pair;
    if (dex == Dex.SHADOW) {
      address factory = IPharaohRouter(SHADOW_ROUTER).factory();
      address weth = IPharaohRouter(SHADOW_ROUTER).WETH();
      pair = IPharaohFactory(factory).createPair(t, weth, false);  
    } else {
      address factory = IMetropolisRouter(METROPOLIS_ROUTER).factory();
      address weth = IMetropolisRouter(METROPOLIS_ROUTER).WETH();
      pair = IMetropolisFactory(factory).createPair(t, weth);
    }
    tokens[t].pair = pair;

    emit TokenCreated(t, msg.sender, curveIndex_, uint256(dex));
    pendingFees += createFee_;
    if (msg.value != createFee_) {
      _buy(t, msg.sender, msg.value - createFee_, 0);
    }
  }

  function createCurve(uint8 index, uint256[] memory lists) external onlyOwner {
    require(curves[index].percentOfLP == 0, "Bellum: CURVE_ALREADY_IN_USE");
    uint256 totalDistribution = 0;
    // Amount of AVAX
    uint256 cumulativeValue = 0;
    uint256 length = lists.length;
    // Calculate the cumulative value and track the last non-zero bin
    for (uint256 i = 0; i < length; ++i) {
      require(lists[i] != 0, "Bellum: INVALID_BIN");
      totalDistribution += lists[i];
      uint256 price = ETHER * (BASIS + (i * BIN_WIDTH)) / BASIS;
      cumulativeValue += lists[i] * price;
    }

    // Ensure the total distribution equals 10,000 (in basis points)
    require(totalDistribution == BASIS, "Bellum: INVALID_TOTAL_DISTRIBUTION");

    // Calculate the price for the last non-zero bin
    uint256 lastNonZeroPrice = ETHER * (((length - 1) * BIN_WIDTH) + BASIS) / BASIS;

    // Calculate the required market cap based on the last non-zero bin value and total tokens
    uint256 requiredMarketCap = BASIS * lastNonZeroPrice;
    uint256 fraction = BASIS * requiredMarketCap / (requiredMarketCap + cumulativeValue);
    curves[index] = Curve(lists, fraction, cumulativeValue / COEF);
    emit CurveCreated(index);
  }

  function sell(address token, uint256 amount0In, uint256 amount1OutMin) external nonReentrant{
    Token storage t = tokens[token];
    require(t.initialSupply != 0, "Bellum: TOKEN_DOES_NOT_EXIST");
    require(!t.hasLaunched, "Bellum: INSUFFICIENT_LIQUIDITY");
    IERC20(token).safeTransferFrom(msg.sender, address(this), amount0In);

    uint256[] memory arr = curves[t.curveIndex].distribution;
    uint256 amount1Out;
    uint256 amount0Used;
    uint256 i = t.currentIndex;
    uint256 currentValue = t.currentValue;
    uint256 initialSupply = t.initialSupply;

    while (amount0Used < amount0In) {
      uint256 amountPerAVAX = initialSupply * COEF / (BASIS + (BIN_WIDTH * i));
      uint256 amount0Remaining = amount0In - amount0Used;
      uint256 amount0InBin = currentValue;
      uint256 amount0InBinMax = arr[i] * initialSupply / BASIS;
      if (amount0InBin + amount0Remaining <= amount0InBinMax) {
        amount1Out += amount0Remaining * ETHER / amountPerAVAX;
        currentValue += amount0Remaining;
        break;
      } else {
        uint256 fillBin = amount0InBinMax - amount0InBin;
        amount0Used += fillBin;
        amount1Out += fillBin * ETHER / amountPerAVAX;
        i--;
        currentValue = 0;
      }
    }
    require(amount1OutMin <= amount1Out, "Bellum: SLIPPAGE_LIMIT");
    require(amount1Out >= MIN_OUT, "Bellum: INSUFFICIENT_ETH_OUT");
    t.currentIndex = i;
    t.currentValue = currentValue;
    
    uint256 fee = amount1Out * tradingFee / BASIS;
    pendingFees += fee;
    payable(msg.sender).sendValue(amount1Out - fee);
    emit BellumSwap(token, msg.sender, amount0In, 0, 0, amount1Out);
  }

  function buy(address token, uint256 amount0OutMin) external payable nonReentrant {
    require(msg.value >= MIN_IN, "Bellum: TOO_LOW");
    _buy(token, msg.sender, msg.value, amount0OutMin);
  }

  function _buy(address token, address sender, uint256 amount1In, uint256 amount0OutMin) internal {
    Token storage t = tokens[token];
    require(t.initialSupply != 0, "Bellum: TOKEN_DOES_NOT_EXIST");
    require(!t.hasLaunched, "Bellum: ALREADY_LAUNCHED");
    uint256[] memory arr = curves[t.curveIndex].distribution;
    uint256 fee = amount1In * tradingFee / BASIS;
    uint256 value = amount1In - fee;
    uint256 amount0Out;
    uint256 amount1Used;
    uint256 i = t.currentIndex;
    uint256 currentValue = t.currentValue;
    uint256 initialSupply = t.initialSupply;
    while (amount1Used < value) {
      uint256 amountPerAVAX = initialSupply * COEF / (BASIS + (BIN_WIDTH * i));
      uint256 valueLeft = value - amount1Used;
      uint256 amount0InBin = currentValue;

      if (amount0InBin > valueLeft * amountPerAVAX / ETHER) {
        uint256 outputAmount = amountPerAVAX * valueLeft / ETHER;

        amount1Used += valueLeft;
        amount0Out += outputAmount;
        currentValue = amount0InBin - outputAmount;
        break;
      } else {
        amount1Used += amount0InBin * ETHER / amountPerAVAX;
        amount0Out += amount0InBin;
        ++i;
        if (i < arr.length) {
          currentValue = arr[i] * initialSupply / BASIS;
        } else {
          break;
        }
      }
    }
    require(amount0OutMin <= amount0Out, "Bellum: SLIPPAGE_LIMIT");
    t.currentIndex = i;
    t.currentValue = currentValue;
    pendingFees += fee;
    IERC20(token).safeTransfer(sender, amount0Out);
    emit BellumSwap(token, sender, 0, amount0Out, amount1In, 0);
    if (i >= arr.length) {
      payable(sender).sendValue(value - amount1Used);
      _launchToken(token);
    }
  }

  function _launchToken(address token) internal {
    require(!tokens[token].hasLaunched, "Bellum: ALREADY_LAUNCHED");

    // Allow Transfers
    IOwnable(token).renounceOwnership();
    uint256 balance = IERC20(token).balanceOf(address(this));
    uint256 avaxToLP = curves[tokens[token].curveIndex].avaxAtLaunch;
    uint256 fee = avaxToLP * migrationFee / BASIS;
    if (fee != 0) {
      pendingFees += fee;
    }

    // Add liquidity
    Dex dex = tokens[token].dex;
    address pair = tokens[token].pair;
    if (dex == Dex.METROPOLIS) {
      IERC20(token).safeIncreaseAllowance(METROPOLIS_ROUTER, balance);
      (,, uint256 liquidity) = IMetropolisRouter(METROPOLIS_ROUTER).addLiquidityETH{value: avaxToLP - fee}(
        token,
        balance,
        0, // slippage is unavoidable
        0, // slippage is unavoidable
        address(this),
        block.timestamp
      );
      uint256 toCreator = liquidity * creatorRewards / BASIS;
      IERC20(pair).safeTransfer(tokens[token].creator, toCreator);
      IERC20(pair).safeTransfer(DEAD_ADDRESS, liquidity - toCreator);
    } else if (dex == Dex.SHADOW) {
      IERC20(token).safeIncreaseAllowance(SHADOW_ROUTER, balance);
      IPharaohRouter(SHADOW_ROUTER).addLiquidityETH{value: avaxToLP - fee}(
        token,
        false,
        balance,
        0, // slippage is unavoidable
        0, // slippage is unavoidable
        DEAD_ADDRESS,
        block.timestamp
      );
    }

    // Update Launch Status
    tokens[token].hasLaunched = true;
    emit CurveCompleted(token, address(0), pair);
  }

  function allTokensLength() external view returns (uint) {
    return allTokens.length;
  }
  
  // Owner
  function changeFeeReceiver(address payable feeReceiver_) external onlyOwner {
    feeReceiver = feeReceiver_;
  }

  function changeFee(uint256 newFee_) external onlyOwner {
    require(newFee_ <= 250, "Bellum: FEE_TOO_HIGH");
    tradingFee = newFee_;
  }

  function setIsPaused(bool isPaused_) external onlyOwner {
    isPaused = isPaused_;
  }

  function setMigrationFee(uint256 migrationFee_) external onlyOwner {
    require(migrationFee_ <= 1000, "Bellum: MIGRATION_FEE_TOO_HIGH");
    migrationFee = migrationFee_;
  }

  function setCreateFee(uint256 createFee_) external onlyOwner {
    require(createFee_ <= 50 ether, "Bellum: FEE_TOO_HIGH");
    createFee = createFee_;
  }

  function setCreatorRewards(uint256 creatorRewards_) external onlyOwner {
    require(creatorRewards_ <= 1000, "Bellum: CREATOR_REWARDS_TOO_HIGH");
    creatorRewards = creatorRewards_;
  }

   // Separate fee collection function
  function collectFees() external {
    uint256 amount = pendingFees;
    require(amount != 0, "No fees to collect");

    pendingFees = 0;
    feeReceiver.sendValue(amount);
  }
}

// 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 v5.0.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

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

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

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

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

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

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

// 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 v5.0.0) (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 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: MIT
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IBellumNursery.sol";

pragma solidity ^0.8.0;

contract BellumNursery is IBellumNursery, ReentrancyGuard {
  using SafeERC20 for IERC20;

  address public immutable token;
  address public immutable pair;
  uint256 public immutable startTime;
  uint256 public immutable PERCENT_PER_EPOCH; // 25 = 0.25%
  uint256 private constant BASIS = 10000;

  struct Share {
    uint256 amount;
    uint256 lastClaimedEpoch;
  }

  uint256 public totalShares;
  mapping(address => Share) public shares;

  event Deposit (
    address indexed sender,
    uint256 amount
  );

  event Withdrawal (
    address indexed sender,
    uint256 amount
  );

  event EmergencyWithdrawal(
    address indexed sender,
    uint256 amount
  );

  event ClaimRewards (
    address indexed sender,
    uint256 lpAmount
  );

  constructor(address token_, address pair_, uint256 percentPerEpoch_) {
    // Factory contract handles this
    PERCENT_PER_EPOCH = percentPerEpoch_;
    token = token_;
    pair = pair_;
    startTime = block.timestamp;
  }

  function deposit(uint256 amount) external nonReentrant {
    IERC20(token).safeTransferFrom(msg.sender, address(this), amount);
    _claimRewards(msg.sender);
    shares[msg.sender].amount += amount;
    totalShares += amount;
    emit Deposit(msg.sender, amount);
  }

  function withdraw(uint256 amount) external nonReentrant {
    require(amount <= shares[msg.sender].amount, "Bellum: NOT_ENOUGH_BALANCE");
    _claimRewards(msg.sender);
    shares[msg.sender].amount -= amount;
    totalShares -= amount;
    IERC20(token).safeTransfer(msg.sender, amount);
    emit Withdrawal(msg.sender, amount);
  }

  function claimRewards() external nonReentrant{
    _claimRewards(msg.sender);
  }

  // In case of emergency. WILL NOT CLAIM REWARDS.
  function emergencyWithdrawal() external nonReentrant {
    uint256 amount = shares[msg.sender].amount;
    totalShares -= amount;
    shares[msg.sender].amount = 0;
    IERC20(token).safeTransfer(msg.sender, amount);
    emit EmergencyWithdrawal(msg.sender, amount);
  }

  function _claimRewards(address shareholder) internal {
    uint256 amount = getUnpaidEarnings(shareholder);
    shares[shareholder].lastClaimedEpoch = getCurrentEpoch();
    IERC20(pair).safeTransfer(shareholder, amount);
    emit ClaimRewards(shareholder, amount);
  }

  function getUnpaidEarnings(address shareholder) public view returns (uint256) {
    uint256 epoch = getCurrentEpoch();
    Share memory share = shares[shareholder];
    
    uint256 totalShares_ = totalShares;
    if (totalShares_ == 0) { return 0; }
    if (share.lastClaimedEpoch < epoch) {
      if (epoch - share.lastClaimedEpoch >= BASIS / PERCENT_PER_EPOCH) {
        return IERC20(pair).balanceOf(address(this))
          * share.amount
          / totalShares_;
      }
      else {
        return IERC20(pair).balanceOf(address(this))
          * share.amount
          * PERCENT_PER_EPOCH
          * (epoch - share.lastClaimedEpoch)
          / totalShares_
          / BASIS;
      }
    }
    return 0;
  }

  function getCurrentEpoch() public view returns (uint256) {
    return (block.timestamp - startTime) / 6 hours;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract BellumToken is ERC20, Ownable {
    // mint to Bellum
    constructor(string memory _name, string memory _symbol, uint112 _totalSupply) ERC20(_name, _symbol) Ownable(msg.sender) {
        _mint(msg.sender, _totalSupply);
    }

    // To prevent LP pricing manipulations
    function _update(address from, address to, uint256 amount) internal virtual override {
        super._update(from, to, amount);
        address bellum = owner();
        if (bellum != address(0)) {
            require(from == bellum || to == bellum || from == address(0), "Bellum: CANNOT_TRANSFER_YET");
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IBellumNursery {
    function withdraw(uint256 amount) external;
    function deposit(uint256 amount) external;
    function claimRewards() external;
    function emergencyWithdrawal() external;
    function getCurrentEpoch() external view returns (uint256);
    function getUnpaidEarnings(address owner) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IOwnable {
    function renounceOwnership() external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.17;

interface IMetropolisFactory {
  function getPair(address tokenA, address tokenB)
    external
    view
    returns (address pair);

  function allPairs(uint256) external view returns (address pair);

  function allPairsLength() external view returns (uint256);

  function createPair(address tokenA, address tokenB)
    external
    returns (address pair);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.17;

interface IMetropolisRouter {
  function factory() external pure returns (address);
  function WETH() external pure returns (address);

  function addLiquidity(
      address tokenA,
      address tokenB,
      uint amountADesired,
      uint amountBDesired,
      uint amountAMin,
      uint amountBMin,
      address to,
      uint deadline
  ) external returns (uint amountA, uint amountB, uint liquidity);
  function addLiquidityETH(
      address token,
      uint amountTokenDesired,
      uint amountTokenMin,
      uint amountETHMin,
      address to,
      uint deadline
  ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IPharaohFactory {
   function params()
        external
        view
        returns (address token0, address token1, bool stable, address voter);

    function allPairsLength() external view returns (uint256);

    function isPair(address pair) external view returns (bool);

    function pairCodeHash() external view returns (bytes32);

    function getPair(
        address tokenA,
        address token,
        bool stable
    ) external view returns (address);

    function createPair(
        address tokenA,
        address tokenB,
        bool stable
    ) external returns (address pair);

    function voter() external view returns (address);

    function allPairs(uint256) external view returns (address);

    function pairFee(address) external view returns (uint256);

    function getFee(bool) external view returns (uint256);

    function isPaused() external view returns (bool);

    function acceptFeeManager() external;

    function setFeeManager(address _feeManager) external;

    function setPairFee(address _pair, uint256 _fee) external;

    function setFee(bool _stable, uint256 _fee) external;
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;

interface IPharaohRouter {  
   function pairFor(
      address tokenA,
      address tokenB,
      bool stable
    ) external view returns (address pair);
   function factory() external pure returns (address);
   function WETH() external pure returns (address);
   function addLiquidityETH(
      address token,
      bool stable,
      uint256 amountTokenDesired,
      uint256 amountTokenMin,
      uint256 amountETHMin,
      address to,
      uint256 deadline
   )
      external
      payable
      returns (
         uint256 amountToken,
         uint256 amountETH,
         uint256 liquidity
      );
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000003a7a1f256b6180d59f58efc080321a09d456ee9b00000000000000000000000095a7e403d7cf20f675ff9273d66e94d35ba49fa30000000000000000000000001d368773735ee1e678950b7a97bca2cafb330cdc

-----Decoded View---------------
Arg [0] : msig (address): 0x3A7A1f256b6180d59f58eFc080321A09D456Ee9b
Arg [1] : metropolisRouter_ (address): 0x95a7e403d7cF20F675fF9273D66e94d35ba49fA3
Arg [2] : shadowRouter_ (address): 0x1D368773735ee1E678950B7A97bcA2CafB330CDc

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000003a7a1f256b6180d59f58efc080321a09d456ee9b
Arg [1] : 00000000000000000000000095a7e403d7cf20f675ff9273d66e94d35ba49fa3
Arg [2] : 0000000000000000000000001d368773735ee1e678950b7a97bca2cafb330cdc