// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Address.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @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 Errors.InsufficientBalance(address(this).balance, amount);
        }

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

    /**
     * @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
     * {Errors.FailedCall} 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 Errors.InsufficientBalance(address(this).balance, value);
        }
        (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 {Errors.FailedCall}) 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 {Errors.FailedCall} 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 {Errors.FailedCall}.
     */
    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
            assembly ("memory-safe") {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert Errors.FailedCall();
        }
    }
}

// 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 v5.1.0) (utils/Errors.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of common custom errors used in multiple contracts
 *
 * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
 * It is recommended to avoid relying on the error API for critical functionality.
 *
 * _Available since v5.1._
 */
library Errors {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error InsufficientBalance(uint256 balance, uint256 needed);

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

    /**
     * @dev The deployment failed.
     */
    error FailedDeployment();

    /**
     * @dev A necessary precompile is missing.
     */
    error MissingPrecompile(address);
}

// 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 v5.0.0) (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
pragma solidity 0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title Otto Token Contract
 */
contract Otto is IERC20, Ownable(msg.sender) {
    using Address for address;

    // Token details
    string private _name = "Otto";
    string private _symbol = "$OTTO";
    uint8 private _decimals = 18;
    uint256 private _totalSupply;

    // Mappings for balances and allowances
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    // Fee configurations
    mapping(address => bool) public isExcludedFromFee;
    mapping(address => bool) public _pair;

    // Fee percentages in basis points (1% = 100 basis points)
    uint256 constant INITIAL_BUY_FEE_PCT = 2500; // 25%
    uint256 constant INITIAL_SELL_FEE_PCT = 3000; // 30%
    uint256 constant SECOND_STAGE_BUY_FEE_PCT = 1500; // 15%
    uint256 constant SECOND_STAGE_SELL_FEE_PCT = 2000; // 20%
    uint256 constant FINAL_BUY_FEE_PCT = 100; // 1%
    uint256 constant FINAL_SELL_FEE_PCT = 100; // 1%

    // Durations in seconds
    uint256 constant FIRST_STAGE_DURATION = 60; // 60 seconds
    uint256 constant SECOND_STAGE_DURATION = 90; // 90 seconds (total 2m30s after launch)

    // Fee reward address and launch time
    address public immutable feeRewardAddress;
    uint256 public launchTime;
    bool private initialized;

    /**
     * @dev Constructor that mints the initial supply to the deployer.
     */
    constructor() {
        _mint(_msgSender(), 1_000_000_000 * 10 ** 18);
        feeRewardAddress = 0x3838705bfF5222E7c0cbb22efc87C130427c13cF;
        setFeeExcluded(feeRewardAddress, true);

    }

    /**
     * @notice Initializes the contract and starting the launch time.
     */
    function initialize() public onlyOwner {
        require(!initialized, "Contract already initialized");
        initialized = true;
        launchTime = block.timestamp;

        setFeeExcluded(_msgSender(), true);
        setFeeExcluded(address(this), true);
    }

    // ERC20 standard functions

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

    /**
     * @notice Returns the symbol of the token.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @notice Returns the number of decimals used to get its user representation.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @notice Returns the total token supply.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @notice Returns the account balance of another account with address `account`.
     * @param account The address of the account to query.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    // ERC20 transfer functions

    /**
     * @notice Transfer `amount` tokens to address `recipient`.
     * @param recipient The address of the recipient.
     * @param amount The amount of tokens to be transferred.
     * @return True if the operation was successful.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    // Allowance functions

    /**
     * @notice Returns the amount which `spender` is still allowed to withdraw from `owner`.
     * @param owner The address of the owner account.
     * @param spender The address of the spender account.
     * @return The remaining amount allowed to be spent.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @notice Allows `spender` to withdraw from your account multiple times, up to the `amount` amount.
     * @param spender The address of the account able to transfer the tokens.
     * @param amount The amount of tokens to be approved for transfer.
     * @return True if the operation was successful.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @notice Transfers `amount` tokens from address `sender` to address `recipient`.
     * @param sender The address which you want to send tokens from.
     * @param recipient The address which you want to transfer to.
     * @param amount The amount of tokens to be transferred.
     * @return True if the operation was successful.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()] - amount);
        return true;
    }

    /**
     * @notice Increases the allowance granted to `spender` by the caller.
     * @param spender The address of the account able to transfer the tokens.
     * @param addedValue The amount of tokens to increase the allowance by.
     * @return True if the operation was successful.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @notice Decreases the allowance granted to `spender` by the caller.
     * @param spender The address of the account able to transfer the tokens.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     * @return True if the operation was successful.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        require(_allowances[_msgSender()][spender] >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] - subtractedValue);
        return true;
    }

    /**
     * @dev Internal function to mint tokens.
     * @param account The address that will receive the minted tokens.
     * @param amount The amount of tokens to mint.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply + amount;
        _balances[account] = _balances[account] + amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Internal function to set the allowance for a spender over the owner's tokens.
     * @param owner The owner of the tokens.
     * @param spender The spender.
     * @param amount The amount of tokens to allow.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @notice Sets an address as a liquidity pair.
     * @param _address The address to set.
     * @param isPair True if the address is a pair, false otherwise.
     */
    function setPair(address _address, bool isPair) public onlyOwner {
        _pair[_address] = isPair;
    }

    /**
     * @notice Excludes or includes an address from fee.
     * @param _address The address to set.
     * @param isExcluded True to exclude from fee, false to include.
     */
    function setFeeExcluded(address _address, bool isExcluded) public onlyOwner {
        isExcludedFromFee[_address] = isExcluded;
    }

  
    /**
     * @notice Returns the current buy fee percentage in basis points.
     * @return The current buy fee percentage.
     */
    function getCurrentBuyFeeRewardPct() public view returns (uint256) {
        if (block.timestamp < launchTime) {
            return 0;
        }
        uint256 elapsedTime = block.timestamp - launchTime;
        if (elapsedTime <= FIRST_STAGE_DURATION) {
            return INITIAL_BUY_FEE_PCT;
        } else if (elapsedTime <= FIRST_STAGE_DURATION + SECOND_STAGE_DURATION) {
            return SECOND_STAGE_BUY_FEE_PCT;
        } else {
            return FINAL_BUY_FEE_PCT;
        }
    }

    /**
     * @notice Returns the current sell fee percentage in basis points.
     * @return The current sell fee percentage.
     */
    function getCurrentSellFeeRewardPct() public view returns (uint256) {
        if (block.timestamp < launchTime) {
            return 0;
        }
        uint256 elapsedTime = block.timestamp - launchTime;
        if (elapsedTime <= FIRST_STAGE_DURATION) {
            return INITIAL_SELL_FEE_PCT;
        } else if (elapsedTime <= FIRST_STAGE_DURATION + SECOND_STAGE_DURATION) {
            return SECOND_STAGE_SELL_FEE_PCT;
        } else {
            return FINAL_SELL_FEE_PCT;
        }
    }

    /**
     * @dev Internal transfer function with tax logic.
     * @param from The address transferring tokens.
     * @param to The address receiving tokens.
     * @param amount The amount of tokens to transfer.
     */
    function _transfer(address from, address to, uint256 amount) internal {
        require( from != address(0), "ERC20: transfer from the zero address");
        require( to != address(0), "ERC20: transfer to the zero address");

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");

        // Normal transaction (non-buy/sell or fee-excluded)
        if ((!_pair[from] && !_pair[to]) || isExcludedFromFee[from] || isExcludedFromFee[to]) {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
            emit Transfer(from, to, amount);
        }
        // Sell transaction
        else if (!_pair[from] && _pair[to]) {
            _balances[from] = fromBalance - amount;
            uint256 currentSellFeeRewardPct = getCurrentSellFeeRewardPct();
            uint256 rewardfee = (amount * currentSellFeeRewardPct) / 10000;
            uint256 amountAfterFee = amount - rewardfee;
            _balances[to] += amountAfterFee;
            _balances[feeRewardAddress] += rewardfee;
            emit Transfer(from, to, amountAfterFee);
            emit Transfer(from, feeRewardAddress, rewardfee);
        }
        // Buy transaction
        else if (_pair[from] && !_pair[to]) {
            _balances[from] = fromBalance - amount;
            uint256 currentBuyFeeRewardPct = getCurrentBuyFeeRewardPct();
            uint256 rewardfee = (amount * currentBuyFeeRewardPct) / 10000;
            uint256 amountAfterFee = amount - rewardfee;
            _balances[to] += amountAfterFee;
            _balances[feeRewardAddress] += rewardfee;
            emit Transfer(from, to, amountAfterFee);
            emit Transfer(from, feeRewardAddress, rewardfee);
        }
        // Else, regular transfer
        else {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
            emit Transfer(from, to, amount);
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of `from`'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of `from`'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * @param from Address transferring tokens.
     * @param to Address receiving tokens.
     * @param amount Amount of tokens being transferred.
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

{
  "compilationTarget": {
    "Toto.sol": "Otto"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}