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

import "ERC20.sol";
import "IERC20.sol";
import "ILido.sol";

contract WstKSM is ERC20 {
    // LIDO contract
    ILido public LIDO;

    // vKSM precompile
    IERC20 public VKSM;

    // Token decimals
    uint8 internal _decimals;

    /**
     * @param _lido address of the StKSM token to wrap
     */
    constructor(ILido _lido, IERC20 _vKSM, uint8 __decimals) ERC20("Wrapped liquid staked DOT", "wstDOT") {
        require(__decimals > 0, "WSTKSM: INCORRECT_DECIMALS");
        LIDO = _lido;
        VKSM = _vKSM;
        _decimals = __decimals;
    }

    /**
    * @notice Stub fallback for native token, always reverting
    */
    fallback() external {
        revert("WSTKSM: FORBIDDEN");
    }

    /**
     * @return the number of decimals for getting user representation of a token amount.
     */
    function decimals() public view override returns (uint8) {
        return _decimals;
    }

    /**
     * @notice Stake vKSM to stKSM and wrap stKSM to wstKSM
     * @param _vKSMAmount amount of vKSM
     * @return Amount of wstKSM for a given vKSM amount
     */
    function submit(uint256 _vKSMAmount) external returns (uint256) {
        require(_vKSMAmount > 0, "WSTKSM: ZERO_VKSM");
        VKSM.transferFrom(msg.sender, address(this), _vKSMAmount);
        if (VKSM.allowance(address(this), address(LIDO)) < _vKSMAmount) {
            VKSM.approve(address(LIDO), type(uint256).max);
        }
        uint256 shares = LIDO.deposit(_vKSMAmount);
        require(shares > 0, "WSTKSM: ZERO_SHARES");
        _mint(msg.sender, shares);
        return shares;
    }

    /**
     * @notice Wrap stKSM to wstKSM
     * @param _stKSMAmount amount of stKSM
     * @return Amount of wstKSM for a given stKSM amount
     */
    function wrap(uint256 _stKSMAmount) external returns (uint256) {
        require(_stKSMAmount > 0, "WSTKSM: ZERO_STKSM");
        uint256 wstKSMAmount = LIDO.getSharesByPooledKSM(_stKSMAmount);
        require(wstKSMAmount > 0, "WSTKSM: MINT_ZERO_AMOUNT");
        _mint(msg.sender, wstKSMAmount);
        require(LIDO.transferFrom(msg.sender, address(this), _stKSMAmount), "WSTKSM: TRANSFER_FROM_REVERT");
        return wstKSMAmount;
    }

    /**
     * @notice Unwrap wstKSM to stKSM
     * @param _wstKSMAmount amount of wstKSM
     * @return Amount of stKSM for a given wstKSM amount
     */
    function unwrap(uint256 _wstKSMAmount) external returns (uint256) {
        require(_wstKSMAmount > 0, "WSTKSM: ZERO_WSTKSM");
        uint256 stKSMAmount = LIDO.getPooledKSMByShares(_wstKSMAmount);
        require(stKSMAmount > 0, "WSTKSM: BURN_ZERO_AMOUNT");
        _burn(msg.sender, _wstKSMAmount);
        require(LIDO.transfer(msg.sender, stKSMAmount), "WSTKSM: TRANSFER_REVERT");
        return stKSMAmount;
    }

    /**
     * @notice Get amount of wstKSM for a given amount of stKSM
     * @param _stKSMAmount amount of stKSM
     * @return Amount of wstKSM for a given stKSM amount
     */
    function getWstKSMByStKSM(uint256 _stKSMAmount) external view returns (uint256) {
        return LIDO.getSharesByPooledKSM(_stKSMAmount);
    }

    /**
     * @notice Get amount of stKSM for a given amount of wstKSM
     * @param _wstKSMAmount amount of wstKSM
     * @return Amount of stKSM for a given wstKSM amount
     */
    function getStKSMByWstKSM(uint256 _wstKSMAmount) external view returns (uint256) {
        return LIDO.getPooledKSMByShares(_wstKSMAmount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "IERC20Metadata.sol";
import "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 guidelines: functions revert instead
 * of 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 defaut 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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - 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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, 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:
     *
     * - `to` 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);
    }

    /**
     * @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");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(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 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 to 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 { }
}

// SPDX-License-Identifier: MIT

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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, 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

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);
}

// SPDX-License-Identifier: MIT

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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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

import "Types.sol";

interface ILido {
    function MAX_ALLOWABLE_DIFFERENCE() external view returns(uint128);

    function deposit(uint256 amount) external returns (uint256);

    function distributeRewards(uint256 totalRewards, uint256 ledgerBalance) external;

    function distributeLosses(uint256 totalLosses, uint256 ledgerBalance) external;

    function getStashAccounts() external view returns (bytes32[] memory);

    function getLedgerAddresses() external view returns (address[] memory);

    function ledgerStake(address ledger) external view returns (uint256);

    function transferFromLedger(uint256 amount, uint256 excess) external;

    function transferFromLedger(uint256 amount) external;

    function transferToLedger(uint256 amount) external;

    function flushStakes() external;

    function findLedger(bytes32 stash) external view returns (address);

    function AUTH_MANAGER() external returns(address);

    function ORACLE_MASTER() external view returns (address);

    function decimals() external view returns (uint8);

    function getPooledKSMByShares(uint256 sharesAmount) external view returns (uint256);

    function getSharesByPooledKSM(uint256 amount) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
}

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

interface Types {
    struct Fee{
        uint16 total;
        uint16 operators;
        uint16 developers;
        uint16 treasury;
    }

    struct Stash {
        bytes32 stashAccount;
        uint64  eraId;
    }

    enum LedgerStatus {
        // bonded but not participate in staking
        Idle,
        // participate as nominator
        Nominator,
        // participate as validator
        Validator,
        // not bonded not participate in staking
        None
    }

    struct UnlockingChunk {
        uint128 balance;
        uint64 era;
    }

    struct OracleData {
        bytes32 stashAccount;
        bytes32 controllerAccount;
        LedgerStatus stakeStatus;
        // active part of stash balance
        uint128 activeBalance;
        // locked for stake stash balance.
        uint128 totalBalance;
        // totalBalance = activeBalance + sum(unlocked.balance)
        UnlockingChunk[] unlocking;
        uint32[] claimedRewards;
        // stash account balance. It includes locked (totalBalance) balance assigned
        // to a controller.
        uint128 stashBalance;
        // slashing spans for ledger
        uint32 slashingSpans;
    }

    struct RelaySpec {
        uint16 maxValidatorsPerLedger;
        uint128 minNominatorBalance;
        uint128 ledgerMinimumActiveBalance;
        uint256 maxUnlockingChunks;
    }
}

{
  "evmVersion": "istanbul",
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "libraries": {
    "wstKSM.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000fa36fe1da08c89ec72ea1f0143a35bfd5daea108000000000000000000000000ffffffff1fcacbd218edc0eba20fc2308c778080000000000000000000000000000000000000000000000000000000000000000a

-----Decoded View---------------
Arg [0] : _lido (address): 0xFA36Fe1dA08C89eC72Ea1F0143a35bFd5DAea108
Arg [1] : _vKSM (address): 0xFfFFfFff1FcaCBd218EDc0EbA20Fc2308C778080
Arg [2] : __decimals (uint8): 10

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000fa36fe1da08c89ec72ea1f0143a35bfd5daea108
Arg [1] : 000000000000000000000000ffffffff1fcacbd218edc0eba20fc2308c778080
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000a