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// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "OpenZeppelin/[email protected]/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "./Governable.sol";

interface IStaking {
    function delegates(address staker) external view returns (address);

    // From OGVStaking.sol
    function unstakeFrom(address staker, uint256[] memory lockupIds) external returns (uint256, uint256);

    // From ExponentialStaking.sol
    function stake(uint256 amountIn, uint256 duration, address to, bool stakeRewards, int256 lockupId) external;
}

contract Migrator is Governable {
    ERC20Burnable public immutable ogv;
    ERC20Burnable public immutable ogn;

    IStaking public immutable ogvStaking;
    IStaking public immutable ognStaking;

    // Fixed conversion rate
    uint256 public constant CONVERSION_RATE = 0.09137 ether;

    uint256 public endTime;

    event TokenExchanged(uint256 ogvAmountIn, uint256 ognAmountOut);
    event Decommissioned();
    event LockupsMigrated(address indexed user, uint256[] ogvLockupIds, uint256 newStakeAmount, uint256 newDuration);

    error MigrationAlreadyStarted();
    error ContractInsolvent(uint256 expectedOGN, uint256 availableOGN);
    error LockupIdsRequired();
    error InvalidStakeAmount();

    constructor(address _ogv, address _ogn, address _ogvStaking, address _ognStaking) {
        ogv = ERC20Burnable(_ogv);
        ogn = ERC20Burnable(_ogn);
        ogvStaking = IStaking(_ogvStaking);
        ognStaking = IStaking(_ognStaking);
    }

    /**
     * @notice Solvency Checks
     *
     * This ensures that the contract always has enough OGN to
     * continue with the migration.
     * However, it doesn't revert if the difference is in favour
     * of the contract (i.e. has more OGN than expected).
     */
    modifier isSolvent() {
        _;

        uint256 availableOGN = ogn.balanceOf(address(this));
        uint256 maxOGNNeeded = (ogv.totalSupply() * CONVERSION_RATE) / 1 ether;

        if (availableOGN < maxOGNNeeded) {
            revert ContractInsolvent(maxOGNNeeded, availableOGN);
        }
    }

    /**
     * @notice Starts the migration and sets it to end after
     *          365 days. Also, approves xOGN to transfer OGN
     *          held in this contract. Can be invoked only once
     */
    function start() external onlyGovernor isSolvent {
        if (endTime != 0) {
            revert MigrationAlreadyStarted();
        }

        // Max approve
        ogn.approve(address(ognStaking), type(uint256).max);

        endTime = block.timestamp + 365 days;
    }

    /**
     * @notice Computes the amount of OGN needed for migration
     *          and if the contract has more OGN than that, it
     *          transfers it back to the treasury. If migration complete, transfers all.
     * @param treasury Address that receives excess OGN
     */
    function transferExcessTokens(address treasury) external onlyGovernor {
        uint256 availableOGN = ogn.balanceOf(address(this));

        if (endTime == 0 || isMigrationActive()) {
            uint256 maxOGNNeeded = (ogv.totalSupply() * CONVERSION_RATE) / 1 ether;
            ogn.transfer(treasury, availableOGN - maxOGNNeeded);
        } else {
            emit Decommissioned();
            ogn.transfer(treasury, availableOGN);
        }
    }

    /**
     * @notice Returns the active status of the migration.
     * @return True if migration has started and has not ended yet.
     */
    function isMigrationActive() public view returns (bool) {
        return endTime > 0 && block.timestamp < endTime;
    }

    /**
     * @notice Migrates the specified amount of OGV to OGN.
     *          Does not check if migration is active since
     *          that's okay (until we decommission).
     * @param ogvAmount Amount of OGV to migrate
     * @return ognReceived OGN Received
     */
    function migrate(uint256 ogvAmount) external isSolvent returns (uint256 ognReceived) {
        return _migrate(ogvAmount, msg.sender);
    }

    /**
     * @notice Migrates OGV stakes to OGN. Can also include unstaked OGN & OGV
     *          balances from the user's wallet (if specified).
     *          Does not check if migration is active since that's okay (until
     *          we decommission the contract).
     * @param lockupIds OGV Lockup IDs to be migrated
     * @param ogvAmountFromWallet Extra OGV balance from user's wallet to migrate & stake
     * @param ognAmountFromWallet Extra OGN balance from user's wallet to stake
     * @param migrateRewards If true, Migrate & Stake received rewards
     * @param newStakeAmount Max amount of OGN (from wallet+unstake) to stake
     * @param newStakeDuration Duration of the new stake
     */
    function migrate(
        uint256[] calldata lockupIds,
        uint256 ogvAmountFromWallet,
        uint256 ognAmountFromWallet,
        bool migrateRewards,
        uint256 newStakeAmount,
        uint256 newStakeDuration
    ) external isSolvent {
        if (lockupIds.length == 0) {
            revert LockupIdsRequired();
        }

        // Unstake
        (uint256 ogvAmountUnlocked, uint256 rewardsCollected) = ogvStaking.unstakeFrom(msg.sender, lockupIds);

        if (migrateRewards) {
            // Include rewards if needed
            ogvAmountFromWallet += rewardsCollected;
        }

        ogvAmountFromWallet += ogvAmountUnlocked;

        if (ognAmountFromWallet > 0) {
            // Transfer in additional OGN to stake from user's wallet
            ogn.transferFrom(msg.sender, address(this), ognAmountFromWallet);
        }

        // Migrate OGV to OGN and include that along with existing balance
        ognAmountFromWallet += _migrate(ogvAmountFromWallet, address(this));

        if (ognAmountFromWallet < newStakeAmount) {
            revert InvalidStakeAmount();
        }

        uint256 ognToWallet = ognAmountFromWallet - newStakeAmount;
        if (ognToWallet > 0) {
            ogn.transfer(msg.sender, ognToWallet);
        }

        if (newStakeAmount > 0) {
            // Stake it
            ognStaking.stake(
                newStakeAmount,
                newStakeDuration,
                msg.sender,
                false,
                -1 // New stake
            );
        }

        emit LockupsMigrated(msg.sender, lockupIds, newStakeAmount, newStakeDuration);
    }

    /**
     * @notice Migrates caller's OGV to OGN and sends it to the `receiver`
     * @return ognReceived OGN Received
     */
    function _migrate(uint256 ogvAmount, address receiver) internal returns (uint256 ognReceived) {
        ognReceived = (ogvAmount * CONVERSION_RATE) / 1 ether;

        emit TokenExchanged(ogvAmount, ognReceived);

        ogv.burnFrom(msg.sender, ogvAmount);

        if (receiver != address(this)) {
            // When migrating stakes, the contract would directly
            // stake the balance on behalf of the user. So there's
            // no need to transfer to self. Transfering to user and then
            // back to this contract would only increase gas cost (and
            // an additional tx for the user).
            ogn.transfer(receiver, ognReceived);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title OUSD Governable Contract
 * @dev Copy of the openzeppelin Ownable.sol contract with nomenclature change
 *      from owner to governor and renounce methods removed. Does not use
 *      Context.sol like Ownable.sol does for simplification.
 * @author Origin Protocol Inc
 */
abstract contract Governable {
    // Storage position of the owner and pendingOwner of the contract
    // keccak256("OUSD.governor");
    bytes32 private constant governorPosition = 0x7bea13895fa79d2831e0a9e28edede30099005a50d652d8957cf8a607ee6ca4a;

    // keccak256("OUSD.pending.governor");
    bytes32 private constant pendingGovernorPosition =
        0x44c4d30b2eaad5130ad70c3ba6972730566f3e6359ab83e800d905c61b1c51db;

    // keccak256("OUSD.reentry.status");
    bytes32 private constant reentryStatusPosition = 0x53bf423e48ed90e97d02ab0ebab13b2a235a6bfbe9c321847d5c175333ac4535;

    // See OpenZeppelin ReentrancyGuard implementation
    uint256 constant _NOT_ENTERED = 1;
    uint256 constant _ENTERED = 2;

    event PendingGovernorshipTransfer(address indexed previousGovernor, address indexed newGovernor);

    event GovernorshipTransferred(address indexed previousGovernor, address indexed newGovernor);

    /**
     * @dev Initializes the contract setting the deployer as the initial Governor.
     */
    constructor() {
        _setGovernor(msg.sender);
        emit GovernorshipTransferred(address(0), _governor());
    }

    /**
     * @dev Returns the address of the current Governor.
     */
    function governor() public view returns (address) {
        return _governor();
    }

    /**
     * @dev Returns the address of the current Governor.
     */
    function _governor() internal view returns (address governorOut) {
        bytes32 position = governorPosition;
        assembly {
            governorOut := sload(position)
        }
    }

    /**
     * @dev Returns the address of the pending Governor.
     */
    function _pendingGovernor() internal view returns (address pendingGovernor) {
        bytes32 position = pendingGovernorPosition;
        assembly {
            pendingGovernor := sload(position)
        }
    }

    /**
     * @dev Throws if called by any account other than the Governor.
     */
    modifier onlyGovernor() {
        require(isGovernor(), "Caller is not the Governor");
        _;
    }

    /**
     * @dev Returns true if the caller is the current Governor.
     */
    function isGovernor() public view returns (bool) {
        return msg.sender == _governor();
    }

    function _setGovernor(address newGovernor) internal {
        bytes32 position = governorPosition;
        assembly {
            sstore(position, newGovernor)
        }
    }

    /**
     * @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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        bytes32 position = reentryStatusPosition;
        uint256 _reentry_status;
        assembly {
            _reentry_status := sload(position)
        }

        // On the first call to nonReentrant, _notEntered will be true
        require(_reentry_status != _ENTERED, "Reentrant call");

        // Any calls to nonReentrant after this point will fail
        assembly {
            sstore(position, _ENTERED)
        }

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        assembly {
            sstore(position, _NOT_ENTERED)
        }
    }

    function _setPendingGovernor(address newGovernor) internal {
        bytes32 position = pendingGovernorPosition;
        assembly {
            sstore(position, newGovernor)
        }
    }

    /**
     * @dev Transfers Governance of the contract to a new account (`newGovernor`).
     * Can only be called by the current Governor. Must be claimed for this to complete
     * @param _newGovernor Address of the new Governor
     */
    function transferGovernance(address _newGovernor) external onlyGovernor {
        _setPendingGovernor(_newGovernor);
        emit PendingGovernorshipTransfer(_governor(), _newGovernor);
    }

    /**
     * @dev Claim Governance of the contract to a new account (`newGovernor`).
     * Can only be called by the new Governor.
     */
    function claimGovernance() external {
        require(msg.sender == _pendingGovernor(), "Only the pending Governor can complete the claim");
        _changeGovernor(msg.sender);
    }

    /**
     * @dev Change Governance of the contract to a new account (`newGovernor`).
     * @param _newGovernor Address of the new Governor
     */
    function _changeGovernor(address _newGovernor) internal {
        require(_newGovernor != address(0), "New Governor is address(0)");
        emit GovernorshipTransferred(_governor(), _newGovernor);
        _setGovernor(_newGovernor);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * 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.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * 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 override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 value {ERC20} uses, unless this function is
     * 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 override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override 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 `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` 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 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        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 `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` 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.
     */
    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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount
    ) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
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);
}

{
  "remappings": [
    "contracts/=contracts/",
    "script/=script/",
    "tests/=tests/",
    "utils/=contracts/utils/",
    "OpenZeppelin/openzeppelin-contracts@02fcc75bb7f35376c22def91b0fb9bc7a50b9458/=lib/openzeppelin-contracts/",
    "OpenZeppelin/openzeppelin-contracts-upgradeable@a16f26a063cd018c4c986832c3df332a131f53b9/=lib/openzeppelin-contracts-upgradeable/",
    "OpenZeppelin/[email protected]/=lib/openzeppelin-contracts/",
    "OpenZeppelin/[email protected]/=lib/openzeppelin-contracts-upgradeable/",
    "paulrberg/[email protected]/=lib/prb-math/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "prb-math/=lib/prb-math/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "viaIR": false,
  "libraries": {
    "contracts/utils/VmHelper.sol": {
      "VmHelper": "0x59E742b8D6c02e24c348EBbD5fF1883B3a4AC7a9"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_ogv","type":"address"},{"internalType":"address","name":"_ogn","type":"address"},{"internalType":"address","name":"_ogvStaking","type":"address"},{"internalType":"address","name":"_ognStaking","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"expectedOGN","type":"uint256"},{"internalType":"uint256","name":"availableOGN","type":"uint256"}],"name":"ContractInsolvent","type":"error"},{"inputs":[],"name":"InvalidStakeAmount","type":"error"},{"inputs":[],"name":"LockupIdsRequired","type":"error"},{"inputs":[],"name":"MigrationAlreadyStarted","type":"error"},{"anonymous":false,"inputs":[],"name":"Decommissioned","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousGovernor","type":"address"},{"indexed":true,"internalType":"address","name":"newGovernor","type":"address"}],"name":"GovernorshipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"ogvLockupIds","type":"uint256[]"},{"indexed":false,"internalType":"uint256","name":"newStakeAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newDuration","type":"uint256"}],"name":"LockupsMigrated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousGovernor","type":"address"},{"indexed":true,"internalType":"address","name":"newGovernor","type":"address"}],"name":"PendingGovernorshipTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"ogvAmountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"ognAmountOut","type":"uint256"}],"name":"TokenExchanged","type":"event"},{"inputs":[],"name":"CONVERSION_RATE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimGovernance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"endTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"governor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isGovernor","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isMigrationActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"ogvAmount","type":"uint256"}],"name":"migrate","outputs":[{"internalType":"uint256","name":"ognReceived","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"lockupIds","type":"uint256[]"},{"internalType":"uint256","name":"ogvAmountFromWallet","type":"uint256"},{"internalType":"uint256","name":"ognAmountFromWallet","type":"uint256"},{"internalType":"bool","name":"migrateRewards","type":"bool"},{"internalType":"uint256","name":"newStakeAmount","type":"uint256"},{"internalType":"uint256","name":"newStakeDuration","type":"uint256"}],"name":"migrate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"ogn","outputs":[{"internalType":"contract ERC20Burnable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ognStaking","outputs":[{"internalType":"contract IStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ogv","outputs":[{"internalType":"contract ERC20Burnable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ogvStaking","outputs":[{"internalType":"contract IStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"start","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"treasury","type":"address"}],"name":"transferExcessTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newGovernor","type":"address"}],"name":"transferGovernance","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000009c354503c38481a7a7a51629142963f98ecc12d00000000000000000000000008207c1ffc5b6804f6024322ccf34f29c3541ae260000000000000000000000000c4576ca1c365868e162554af8e385dc3e7c66d900000000000000000000000063898b3b6ef3d39332082178656e9862bee45c57

-----Decoded View---------------
Arg [0] : _ogv (address): 0x9c354503C38481a7A7a51629142963F98eCC12D0
Arg [1] : _ogn (address): 0x8207c1FfC5B6804F6024322CcF34F29c3541Ae26
Arg [2] : _ogvStaking (address): 0x0C4576Ca1c365868E162554AF8e385dc3e7C66D9
Arg [3] : _ognStaking (address): 0x63898b3b6Ef3d39332082178656E9862bee45C57

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000009c354503c38481a7a7a51629142963f98ecc12d0
Arg [1] : 0000000000000000000000008207c1ffc5b6804f6024322ccf34f29c3541ae26
Arg [2] : 0000000000000000000000000c4576ca1c365868e162554af8e385dc3e7c66d9
Arg [3] : 00000000000000000000000063898b3b6ef3d39332082178656e9862bee45c57