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

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";

/**
 * @title OtcMarketplace
 * @notice OTC Marketplace for buying and selling MCGP tokens with USDC
 * @dev Only admin can fund/withdraw and update price phases
 */
contract OtcMarketplace is Ownable, ReentrancyGuard, Pausable {
    using SafeERC20 for IERC20;

    IERC20 public immutable mcgpToken;
    IERC20 public immutable usdcToken;

    // Price phases configuration
    struct PricePhase {
        uint256 price; // Price in USDC (with 6 decimals) per MCGP (18 decimals)
        bool isActive;
        bool isBuyPhase; // true for buy phases, false for sell phases
        string name; // e.g., "1000X down", "2X up"
    }

    PricePhase[] public buyPhases;
    PricePhase[] public sellPhases;

    uint256 public activeBuyPhaseIndex;
    uint256 public activeSellPhaseIndex;

    // Max price to prevent overflow/DoS ($1,000,000 per MCGP)
    uint256 public constant MAX_PRICE = 1e12;

    // Events
    event Bought(address indexed buyer, uint256 mcgpAmount, uint256 usdcAmount, uint256 indexed phaseIndex);
    event Sold(address indexed seller, uint256 mcgpAmount, uint256 usdcAmount, uint256 indexed phaseIndex);
    event PhaseChanged(bool indexed isBuyPhase, uint256 indexed newPhaseIndex);
    event PriceUpdated(bool indexed isBuyPhase, uint256 indexed phaseIndex, uint256 newPrice);
    event Funded(address indexed token, uint256 amount);
    event Withdrawn(address indexed token, uint256 amount);

    /**
     * @param _mcgpToken Address of MCGP token
     * @param _usdcToken Address of USDC token
     */
    constructor(address _mcgpToken, address _usdcToken) Ownable(msg.sender) {
        require(_mcgpToken != address(0), "Invalid MCGP address");
        require(_usdcToken != address(0), "Invalid USDC address");
        
        mcgpToken = IERC20(_mcgpToken);
        usdcToken = IERC20(_usdcToken);

        // Initialize sell phases (presale price = $0.01)
        // Price is in USDC (6 decimals) per MCGP (18 decimals)
        // 1000X down = $0.00001 = 10 USDC (6 decimals) per 1 MCGP (18 decimals)
        sellPhases.push(PricePhase({
            price: 10, // $0.00001 per MCGP
            isActive: true,
            isBuyPhase: false,
            name: "1000X down"
        }));
        sellPhases.push(PricePhase({
            price: 100, // $0.0001 per MCGP
            isActive: false,
            isBuyPhase: false,
            name: "100X down"
        }));
        sellPhases.push(PricePhase({
            price: 1000, // $0.001 per MCGP
            isActive: false,
            isBuyPhase: false,
            name: "10X down"
        }));
        sellPhases.push(PricePhase({
            price: 10000, // $0.01 per MCGP (presale price)
            isActive: false,
            isBuyPhase: false,
            name: "1X up"
        }));
        sellPhases.push(PricePhase({
            price: 100000, // $0.1 per MCGP
            isActive: false,
            isBuyPhase: false,
            name: "10X up"
        }));
        sellPhases.push(PricePhase({
            price: 1000000, // $1 per MCGP
            isActive: false,
            isBuyPhase: false,
            name: "100X up"
        }));
        sellPhases.push(PricePhase({
            price: 10000000, // $10 per MCGP
            isActive: false,
            isBuyPhase: false,
            name: "1000X up"
        }));

        // Initialize buy phases
        // 2X up = $0.02 per MCGP
        buyPhases.push(PricePhase({
            price: 20000, // $0.02 per MCGP
            isActive: true,
            isBuyPhase: true,
            name: "2X up"
        }));
        buyPhases.push(PricePhase({
            price: 200000, // $0.2 per MCGP
            isActive: false,
            isBuyPhase: true,
            name: "20X up"
        }));
        buyPhases.push(PricePhase({
            price: 2000000, // $2 per MCGP
            isActive: false,
            isBuyPhase: true,
            name: "200X up"
        }));
        buyPhases.push(PricePhase({
            price: 20000000, // $20 per MCGP
            isActive: false,
            isBuyPhase: true,
            name: "2000X up"
        }));

        activeBuyPhaseIndex = 0;
        activeSellPhaseIndex = 0;
    }

    /**
     * @notice Calculate USDC amount needed for buying MCGP
     * @param mcgpAmount Amount of MCGP to buy (18 decimals)
     * @return USDC amount needed (6 decimals)
     */
    function calculateBuyPrice(uint256 mcgpAmount) public view returns (uint256) {
        PricePhase memory phase = buyPhases[activeBuyPhaseIndex];
        require(phase.isActive, "Buy phase not active");
        
        // price is USDC (6 decimals) per MCGP (18 decimals)
        // usdcAmount = (mcgpAmount * price) / 1e18
        return (mcgpAmount * phase.price) / 1e18;
    }

    /**
     * @notice Calculate USDC amount received for selling MCGP
     * @param mcgpAmount Amount of MCGP to sell (18 decimals)
     * @return USDC amount received (6 decimals)
     */
    function calculateSellPrice(uint256 mcgpAmount) public view returns (uint256) {
        PricePhase memory phase = sellPhases[activeSellPhaseIndex];
        require(phase.isActive, "Sell phase not active");
        
        // price is USDC (6 decimals) per MCGP (18 decimals)
        // usdcAmount = (mcgpAmount * price) / 1e18
        return (mcgpAmount * phase.price) / 1e18;
    }

    /**
     * @notice Buy MCGP with USDC
     * @param mcgpAmount Amount of MCGP to buy (18 decimals)
     * @param maxUsdcAmount Maximum USDC willing to pay (slippage protection)
     */
    function buy(uint256 mcgpAmount, uint256 maxUsdcAmount) external nonReentrant whenNotPaused {
        require(mcgpAmount > 0, "Amount must be greater than 0");

        uint256 usdcAmount = calculateBuyPrice(mcgpAmount);
        require(usdcAmount > 0, "USDC amount must be greater than 0");
        require(usdcAmount <= maxUsdcAmount, "Slippage exceeded");

        // Check contract has enough MCGP
        require(mcgpToken.balanceOf(address(this)) >= mcgpAmount, "Insufficient MCGP in contract");

        // Transfer USDC from buyer to contract
        usdcToken.safeTransferFrom(msg.sender, address(this), usdcAmount);

        // Transfer MCGP from contract to buyer
        mcgpToken.safeTransfer(msg.sender, mcgpAmount);

        emit Bought(msg.sender, mcgpAmount, usdcAmount, activeBuyPhaseIndex);
    }

    /**
     * @notice Sell MCGP for USDC
     * @param mcgpAmount Amount of MCGP to sell (18 decimals)
     * @param minUsdcAmount Minimum USDC willing to receive (slippage protection)
     */
    function sell(uint256 mcgpAmount, uint256 minUsdcAmount) external nonReentrant whenNotPaused {
        require(mcgpAmount > 0, "Amount must be greater than 0");

        uint256 usdcAmount = calculateSellPrice(mcgpAmount);
        require(usdcAmount > 0, "USDC amount must be greater than 0");
        require(usdcAmount >= minUsdcAmount, "Slippage exceeded");

        // Check contract has enough USDC
        require(usdcToken.balanceOf(address(this)) >= usdcAmount, "Insufficient USDC in contract");

        // Transfer MCGP from seller to contract
        mcgpToken.safeTransferFrom(msg.sender, address(this), mcgpAmount);

        // Transfer USDC from contract to seller
        usdcToken.safeTransfer(msg.sender, usdcAmount);

        emit Sold(msg.sender, mcgpAmount, usdcAmount, activeSellPhaseIndex);
    }

    /**
     * @notice Set active buy phase (only owner)
     * @param phaseIndex Index of the phase to activate
     */
    function setActiveBuyPhase(uint256 phaseIndex) external onlyOwner {
        require(phaseIndex < buyPhases.length, "Invalid phase index");
        
        // Deactivate current phase
        buyPhases[activeBuyPhaseIndex].isActive = false;
        
        // Activate new phase
        activeBuyPhaseIndex = phaseIndex;
        buyPhases[phaseIndex].isActive = true;

        emit PhaseChanged(true, phaseIndex);
    }

    /**
     * @notice Set active sell phase (only owner)
     * @param phaseIndex Index of the phase to activate
     */
    function setActiveSellPhase(uint256 phaseIndex) external onlyOwner {
        require(phaseIndex < sellPhases.length, "Invalid phase index");
        
        // Deactivate current phase
        sellPhases[activeSellPhaseIndex].isActive = false;
        
        // Activate new phase
        activeSellPhaseIndex = phaseIndex;
        sellPhases[phaseIndex].isActive = true;

        emit PhaseChanged(false, phaseIndex);
    }

    /**
     * @notice Update price for a specific phase (only owner)
     * @param isBuyPhase True for buy phase, false for sell phase
     * @param phaseIndex Index of the phase to update
     * @param newPrice New price in USDC (6 decimals) per MCGP (18 decimals)
     */
    function updatePhasePrice(bool isBuyPhase, uint256 phaseIndex, uint256 newPrice) external onlyOwner {
        require(newPrice > 0, "Price must be greater than 0");
        require(newPrice <= MAX_PRICE, "Price exceeds maximum");
        
        if (isBuyPhase) {
            require(phaseIndex < buyPhases.length, "Invalid phase index");
            buyPhases[phaseIndex].price = newPrice;
        } else {
            require(phaseIndex < sellPhases.length, "Invalid phase index");
            sellPhases[phaseIndex].price = newPrice;
        }

        emit PriceUpdated(isBuyPhase, phaseIndex, newPrice);
    }

    /**
     * @notice Fund contract with tokens (only owner)
     * @param token Address of token to fund
     * @param amount Amount to fund
     */
    function fund(address token, uint256 amount) external onlyOwner {
        require(token == address(mcgpToken) || token == address(usdcToken), "Invalid token");
        require(amount > 0, "Amount must be greater than 0");

        IERC20(token).safeTransferFrom(msg.sender, address(this), amount);

        emit Funded(token, amount);
    }

    /**
     * @notice Withdraw tokens from contract (only owner)
     * @param token Address of token to withdraw
     * @param amount Amount to withdraw
     */
    function withdraw(address token, uint256 amount) external onlyOwner {
        require(token == address(mcgpToken) || token == address(usdcToken), "Invalid token");
        require(amount > 0, "Amount must be greater than 0");
        require(IERC20(token).balanceOf(address(this)) >= amount, "Insufficient balance");

        IERC20(token).safeTransfer(msg.sender, amount);

        emit Withdrawn(token, amount);
    }

    /**
     * @notice Pause trading (only owner)
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpause trading (only owner)
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @notice Get all buy phases
     */
    function getBuyPhases() external view returns (PricePhase[] memory) {
        return buyPhases;
    }

    /**
     * @notice Get all sell phases
     */
    function getSellPhases() external view returns (PricePhase[] memory) {
        return sellPhases;
    }

    /**
     * @notice Get contract balances
     */
    function getBalances() external view returns (uint256 mcgpBalance, uint256 usdcBalance) {
        mcgpBalance = mcgpToken.balanceOf(address(this));
        usdcBalance = usdcToken.balanceOf(address(this));
    }
}

// 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 v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @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 v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 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 Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    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 Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// 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 v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

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

pragma solidity ^0.8.20;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

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

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

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

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

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

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

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

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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

pragma solidity ^0.8.20;

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

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

    uint256 private _status;

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

    constructor() {
        _status = NOT_ENTERED;
    }

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

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

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

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

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

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

[{"inputs":[{"internalType":"address","name":"_mcgpToken","type":"address"},{"internalType":"address","name":"_usdcToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"EnforcedPause","type":"error"},{"inputs":[],"name":"ExpectedPause","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"mcgpAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"usdcAmount","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"phaseIndex","type":"uint256"}],"name":"Bought","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Funded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bool","name":"isBuyPhase","type":"bool"},{"indexed":true,"internalType":"uint256","name":"newPhaseIndex","type":"uint256"}],"name":"PhaseChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bool","name":"isBuyPhase","type":"bool"},{"indexed":true,"internalType":"uint256","name":"phaseIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newPrice","type":"uint256"}],"name":"PriceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":false,"internalType":"uint256","name":"mcgpAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"usdcAmount","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"phaseIndex","type":"uint256"}],"name":"Sold","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[],"name":"MAX_PRICE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"activeBuyPhaseIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"activeSellPhaseIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"mcgpAmount","type":"uint256"},{"internalType":"uint256","name":"maxUsdcAmount","type":"uint256"}],"name":"buy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"buyPhases","outputs":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isBuyPhase","type":"bool"},{"internalType":"string","name":"name","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"mcgpAmount","type":"uint256"}],"name":"calculateBuyPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"mcgpAmount","type":"uint256"}],"name":"calculateSellPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"fund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getBalances","outputs":[{"internalType":"uint256","name":"mcgpBalance","type":"uint256"},{"internalType":"uint256","name":"usdcBalance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getBuyPhases","outputs":[{"components":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isBuyPhase","type":"bool"},{"internalType":"string","name":"name","type":"string"}],"internalType":"struct OtcMarketplace.PricePhase[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getSellPhases","outputs":[{"components":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isBuyPhase","type":"bool"},{"internalType":"string","name":"name","type":"string"}],"internalType":"struct OtcMarketplace.PricePhase[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mcgpToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"mcgpAmount","type":"uint256"},{"internalType":"uint256","name":"minUsdcAmount","type":"uint256"}],"name":"sell","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"sellPhases","outputs":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isBuyPhase","type":"bool"},{"internalType":"string","name":"name","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"phaseIndex","type":"uint256"}],"name":"setActiveBuyPhase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"phaseIndex","type":"uint256"}],"name":"setActiveSellPhase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"isBuyPhase","type":"bool"},{"internalType":"uint256","name":"phaseIndex","type":"uint256"},{"internalType":"uint256","name":"newPrice","type":"uint256"}],"name":"updatePhasePrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"usdcToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000517600323e5e2938207fa2e2e915b9d80e5b2b21000000000000000000000000a4879fed32ecbef99399e5cbc247e533421c4ec6

-----Decoded View---------------
Arg [0] : _mcgpToken (address): 0x517600323e5E2938207fA2e2e915B9D80e5B2b21
Arg [1] : _usdcToken (address): 0xA4879Fed32Ecbef99399e5cbC247E533421C4eC6

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000517600323e5e2938207fa2e2e915b9d80e5b2b21
Arg [1] : 000000000000000000000000a4879fed32ecbef99399e5cbc247e533421c4ec6