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// SPDX-License-Identifier: NONE
pragma solidity ^0.8.9;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./interfaces/IQAdmin.sol";
import "./interfaces/IQodaERC20.sol";
import "./interfaces/IStakingEmissionsQontroller.sol";

contract StakingEmissionsQontroller is Initializable, IStakingEmissionsQontroller {

  using SafeERC20 for IERC20;
  using SafeERC20 for IQodaERC20;
  
  struct StakingPeriod {

    /// @notice total emissions for the period
    uint emissions;

    /// @notice total length of the period in blocks
    uint numBlocks;
  }

  struct UserInfo {

    /// @notice Amount of veToken 
    uint amount;

    /// @notice Emissions debt
    uint debt;
    
    /// @notice Unclaimed reward from user
    uint pendingReward;
  }

  /// @notice Contract storing all global Qoda parameters
  IQAdmin private _qAdmin;
    
  /// @notice Address of underlying QODA token
  IQodaERC20 private _qodaERC20;
    
  /// @notice Address of veToken
  IERC20 private _veToken;

  /// @notice Precision factor for calculating emissions
  uint private constant _PRECISION_FACTOR = 10**20;
  
  /// @notice Number of emissions periods
  uint private _numPeriods;
  
  /// @notice Accumulated tokens per share
  uint private _accTokenPerShare;  
    
  /// @notice Current period for emissions
  uint private _currentPeriod;

  /// @notice Block number when current emissions regime end
  uint private _endBlock;

  /// @notice Block number of the last update
  uint private _lastEmissionsBlock;

  /// @notice QODA Tokens distributed
  uint private _emissions;

  /// @notice total length of current period in blocks
  uint private _numBlocks;

  /// @notice Map defining the staking period and associated emissions
  mapping(uint => StakingPeriod) private _stakingPeriod;

  /// @notice Mapping of user emissions debt
  /// account => UserInfo
  mapping(address => UserInfo) private _userInfo;

  /// @notice Constructor for upgradeable contracts
  /// @param qAdminAddress Address of qAdmin
  /// @param qodaERC20Address Address of QODA ERC20 token
  /// @param veTokenAddress Address of veToken
  /// @param emissions_ Array of emission rewards by staking period
  /// @param numBlocks_ Array of number of blocks of each staking period
  /// @param numPeriods_ Total number of staking periods
  function initialize(
                      address qAdminAddress,
                      address qodaERC20Address,
                      address veTokenAddress,
                      uint[] memory emissions_,
                      uint[] memory numBlocks_,
                      uint numPeriods_
                      ) public initializer {
    require(
            emissions_.length == numPeriods_ &&
            numBlocks_.length == numPeriods_,
            "SEQ5 length mismatch"
            );

    _qAdmin = IQAdmin(qAdminAddress);
    _qodaERC20 = IQodaERC20(qodaERC20Address);
    _veToken = IERC20(veTokenAddress);
    _numPeriods = numPeriods_;
    _currentPeriod = 0;

    // Initialize staking periods and rewards config
    for (uint i = 0; i < numPeriods_; i++) {
      _stakingPeriod[i] = StakingPeriod({
        emissions: emissions_[i],
        numBlocks: numBlocks_[i]
        });
    }
    
    // Initialize staking periods and rewards
    _emissions = _stakingPeriod[0].emissions;
    _numBlocks = _stakingPeriod[0].numBlocks;
  }

  /// @notice Modifier which checks that the caller has the `VETOKEN` role
  modifier onlyVeToken() {
    require(_qAdmin.hasRole(_qAdmin.VETOKEN_ROLE(), msg.sender), "SEQ1 only veToken");
    _;
  }

  /// @notice Modifier which checks that the caller has the `ADMIN` role
  modifier onlyAdmin() {
    require(_qAdmin.hasRole(_qAdmin.ADMIN_ROLE(), msg.sender), "SEQ2 only admin");
    _;
  }
  
  /** ACCESS CONTROLLED FUNCTIONS **/
  
  /// @notice Credits the account with the given amount in `StakingEmissionsQontroller`
  /// This function should only be called by the veToken contract when the user
  /// claims their accrued veTokens.
  /// @param account Address of the user
  /// @param amount Amount to credit the account
  function deposit(address account, uint amount) external onlyVeToken {
    _deposit(account, amount, block.number);
  }

  /// @notice Cancels account's full amount and debt from `StakingEmissionsQontroller`
  /// and claims any remaining emissions for that account. This should only
  /// be called by the veToken contract when the user unstakes the underlying
  /// @param account Address of the user.
  function withdraw(address account) external onlyVeToken {
    _withdraw(account, block.number);
  }
  
  /// @notice Function to start reward distribution, can only be invoked once.
  /// @param startBlock starting block for reward distribution, 0 for current block
  function _startStaking(uint startBlock) external onlyAdmin {
    require(_endBlock <= 0 && _lastEmissionsBlock <= 0, "SEQ3 startStaking can only be called once");
    uint blockNum = startBlock > 0? startBlock: block.number;
    _endBlock = blockNum + _stakingPeriod[0].numBlocks;
    _lastEmissionsBlock = blockNum;
  }
  
  /** USER INTERFACE **/
  
  /// @notice Transfer accrued emissions from `StakingEmissionsQontroller` to veToken holder
  /// This function can be called by the user anytime and as often as they wish.
  function claimEmissions() external {
    _claimEmissions(msg.sender, block.number);
  }

  /// @notice Update emissions variables of the pool
  function updatePool() external {
    _updatePool(block.number);
  }


  /** VIEW FUNCTIONS **/

  /// @notice Calculates the amount of emissions claimable by a user by updating
  /// the pool info in memory without writing to storage so that viewing the
  /// claimable amount does not incur gas costs.
  /// @param account Address of the user
  /// @return uint Amount claimable
  function claimableEmissions(address account) external view returns(uint) {
    return _claimableEmissions(account, block.number);
  }
  
  /// @notice Get the address of the `QAdmin` contract
  /// @return address Address of `QAdmin` contract
  function qAdmin() external view returns(address){
    return address(_qAdmin);
  }

  /// @notice Get the address of the `QodaERC20` contract
  /// @return address Address of `QodaERC20` contract
  function qodaERC20() external view returns(address) {
    return address(_qodaERC20);
  }

  /// @notice Get the address of the `veQoda` contract
  /// @return address Address of `veQoda` contract
  function veToken() external view returns(address) {
    return address(_veToken);
  }

  function numPeriods() external view returns(uint) {
    return _numPeriods;
  }
  
  function accTokenPerShare() external view returns(uint) {
    return _accTokenPerShare;
  }

  function currentPeriod() external view returns(uint) {
    return _currentPeriod;
  }

  function endBlock() external view returns(uint) {
    return _endBlock;
  }

  function lastEmissionsBlock() external view returns(uint) {
    return _lastEmissionsBlock;
  }

  function emissions() external view returns(uint) {
    return _emissions;
  }

  function numBlocks() external view returns(uint) {
    return _numBlocks;
  }

  // @return emissions per block, scaled by 1e18
  function emissionsPerBlock() external view returns(uint) {
    return _qodaERC20.decimals() * _emissions / _numBlocks;
  }

  function userInfo(address account) external view returns(uint, uint, uint) {
    return (_userInfo[account].amount, _userInfo[account].debt, _userInfo[account].pendingReward);
  }
  
  function stakingPeriod(uint i) external view returns(uint, uint){
    return (_stakingPeriod[i].emissions, _stakingPeriod[i].numBlocks);
  }
  
  /** INTERNAL FUNCTIONS **/
  
  /// @notice Transfer accrued emissions from `StakingEmissionsQontroller` to veToken holder
  /// @param account Address of the user
  /// @param blockNum current block number
  function _claimEmissions(address account, uint blockNum) internal {
    // update pool information
    _updatePool(blockNum);

    // Calculate the amount of emissions to transfer to user
    uint emission = _claimableEmissions(account, blockNum);

    // Update emissions debt
    _userInfo[account].debt += emission;
    
    // Fetch previously unclaimed reward 
    uint pendingReward = _userInfo[account].pendingReward;
    
    if (emission + pendingReward > 0) {
      // Reset unclaimed reward
      _userInfo[account].pendingReward = 0;
  
      // Transfer emissions to sender
      _qodaERC20.safeTransfer(account, emission + pendingReward);
  
      // Emit the event
      emit ClaimEmissions(account, emission);
    }
  }
  
  /// @notice Credits the account with the given amount in `StakingEmissionsQontroller`
  /// This function should only be called by the veToken contract when the user
  /// claims their accrued veTokens.
  /// @param account Address of the user
  /// @param amount Amount to credit the account
  /// @param blockNum current block number
  function _deposit(address account, uint amount, uint blockNum) internal {
    require(amount > 0, "SEQ4 Amount must be > 0");
    
    // Update pool information
    _updatePool(blockNum);
    
    // Calculate amount of emissions to be claimed by user later on
    _userInfo[account].pendingReward += _claimableEmissions(account, blockNum);

    // Amount just deposited should not have any claimable emission previously, so debt is updated to reflect that
    _userInfo[account].amount += amount;
    _userInfo[account].debt = _userInfo[account].amount * _accTokenPerShare / _PRECISION_FACTOR;

    // Emit the event
    emit Deposit(account, amount);
  }

  /// @notice Cancels account's full amount and debt from `StakingEmissionsQontroller`
  /// and claims any remaining emissions for that account. This should only
  /// be called by the veToken contract when the user unstakes the underlying
  /// @param account Address of the user
  /// @param blockNum current block number
  function _withdraw(address account, uint blockNum) internal {
    require(_userInfo[account].amount > 0, "SEQ6 Account must have deposit > 0");
    
    // Update pool information
    _updatePool(blockNum);
    
    // Calculate amount of emissions to be claimed by user later on
    _userInfo[account].pendingReward += _claimableEmissions(account, blockNum);
    
    // Emit the event
    emit Withdraw(account, _userInfo[account].amount);
    
    // Adjust user info
    _userInfo[account].amount = 0;
    _userInfo[account].debt = 0;
  }
  
  /// @notice Calculates the amount of emissions claimable by a user by updating
  /// the pool info in memory without writing to storage so that viewing the
  /// claimable amount does not incur gas costs.
  /// @param account Address of the user
  /// @param blockNum current block number
  /// @return uint Amount claimable
  function _claimableEmissions(address account, uint blockNum) internal view returns(uint){
    // if emission has not been started or no veToken has been accrued by anyone yet, there will not be any claimable emission
    if (_lastEmissionsBlock <= 0 || _endBlock <= 0 || _veToken.totalSupply() <= 0) {
      return 0;
    }
    uint tokenPerShare = _accTokenPerShare;
    if (blockNum > _lastEmissionsBlock) {

      // Calculate block multiplier
      uint blockMultiplier = _getBlockMultiplier(_lastEmissionsBlock, blockNum);

      // Calculate emissions for staking
      uint tokenEmissions = _emissions * blockMultiplier / _numBlocks;

      uint adjEndBlock = _endBlock;
      uint adjCurrentPeriod = _currentPeriod;

      while(blockNum > adjEndBlock && adjCurrentPeriod < _numPeriods - 1) {

        // update current period
        adjCurrentPeriod++;

        // Calculate adjusted emissions
        uint adjEmissions = _stakingPeriod[adjCurrentPeriod].emissions;

        // Calculate adjusted length of period in blocks
        uint adjNumBlocks = _stakingPeriod[adjCurrentPeriod].numBlocks;

        // Calculate adjusted block number
        uint previousEndBlock = adjEndBlock;

        // Update end block
        adjEndBlock = previousEndBlock + _stakingPeriod[adjCurrentPeriod].numBlocks;

        // Calculate adjusted block multiplier
        uint adjBlockMultiplier = (blockNum <= adjEndBlock)
          ? (blockNum - previousEndBlock)
          : _stakingPeriod[adjCurrentPeriod].numBlocks;

        // Calculate adjusted token emissions
        tokenEmissions += adjEmissions * adjBlockMultiplier / adjNumBlocks;
      }

      // Calculate adjusted tokens per share
      tokenPerShare += (tokenEmissions * _PRECISION_FACTOR) / _veToken.totalSupply();
    }
    return _userInfo[account].amount * tokenPerShare / _PRECISION_FACTOR - _userInfo[account].debt;
  }

  
  /// @notice Update emissions variables of the pool
  /// @param blockNum current block number
  function _updatePool(uint blockNum) internal {

    // blockNum should always be ahead of `_lastEmissionsBlock`. If they are
    // equal, that means someone must have called _updatePool() earlier this
    // block, so we do not need to update again
    if(blockNum <= _lastEmissionsBlock) {
      return;
    }
    
    // Nothing to do if reward distribution has not been started yet
    if (_lastEmissionsBlock <= 0 || _endBlock <= 0) {
      return;
    }

    // Nothing to do if there is no veToken supply
    if (_veToken.totalSupply() <= 0){
      _lastEmissionsBlock = blockNum;
      return;
    }
    
    // Calculate block multiplier
    uint blockMultiplier = _getBlockMultiplier(_lastEmissionsBlock, blockNum);

    // Calculate emissions for staking
    uint tokenEmissions = _emissions * blockMultiplier / _numBlocks;

    // Check whether to adjust multipliers, `_emissions` and `_numBlocks`
    // Here, syncing `_lastEmissionsBlock` to current blockNum would cross the
    // end of the current period into the new period. So we need to fast-forward
    // from the start block of the new block to blockNum
    while(blockNum > _endBlock && _currentPeriod < _numPeriods - 1) {

      // Update `_emissions` and `_numBlocks`
      _updateEmissions(_endBlock);

      uint previousEndBlock = _endBlock;

      // Set `_endBlock to be the end of the new period
      _endBlock += _stakingPeriod[_currentPeriod].numBlocks;

      // Get the number of blocks between `previousEndBlock` (i.e. the current
      // start block) and current blockNum
      uint newBlockMultiplier = _getBlockMultiplier(previousEndBlock, blockNum);

      // Adjust token emissions
      tokenEmissions += (_emissions * newBlockMultiplier / _numBlocks);
    }

    // Mint tokens only if token emissions for staking are not null
    if(tokenEmissions > 0) {
      _accTokenPerShare += tokenEmissions * _PRECISION_FACTOR / _veToken.totalSupply();
    }

    // Update `_lastEmissionsBlock` only if it wasn't updated after or at the end block
    if(_lastEmissionsBlock <= _endBlock) {
      _lastEmissionsBlock = blockNum;
    }
  }
  
  /// @notice Update emissions
  /// @param newStartBlock Pass the new start block (should be the last period's end block)
  function _updateEmissions(uint newStartBlock) internal {

    // Update current period
    _currentPeriod++;

    // Update emissions
    _emissions = _stakingPeriod[_currentPeriod].emissions;

    // Update length of period
    _numBlocks = _stakingPeriod[_currentPeriod].numBlocks;

    // Emit the event
    emit NewEmissionsPerBlock(_currentPeriod, newStartBlock, _emissions, _numBlocks);
  }
  
  /// @notice Return emissions multiplier over the given "from" to "to" block
  /// @param from Block to start calculating emissions
  /// @param to Block to finish calculating emissions
  /// @return uint Multiplier for the period
  function _getBlockMultiplier(uint from, uint to) internal view returns(uint) {
    if (to <= _endBlock) {
      return to - from;
    }
    if (from >= _endBlock) {
      return 0;
    }
    return _endBlock - from;
  }
  
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

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

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

import "@openzeppelin/contracts-upgradeable/access/IAccessControlUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../libraries/QTypes.sol";

interface IQAdmin is IAccessControlUpgradeable {

  /// @notice Emitted when a new FixedRateMarket is deployed
  event CreateFixedRateMarket(address indexed marketAddress, address indexed tokenAddress, uint maturity);
  
  /// @notice Emitted when a new `Asset` is added
  event AddAsset(
                 address indexed tokenAddress,
                 bool isYieldBearing,
                 address oracleFeed,
                 uint collateralFactor,
                 uint marketFactor);

  /// @notice Emitted when setting `_qollateralManager`
  event SetQollateralManager(address qollateralManagerAddress);

  /// @notice Emitted when setting `_stakingEmissionsQontroller`
  event SetStakingEmissionsQontroller(address stakingEmissionsQontrollerAddress);

  /// @notice Emitted when setting `_tradingEmissionsQontroller`
  event SetTradingEmissionsQontroller(address tradingEmissionsQontrollerAddress);

  /// @notice Emitted when setting `_feeEmissionsQontroller`
  event SetFeeEmissionsQontroller(address feeEmissionsQontrollerAddress);

  /// @notice Emitted when setting `_veQoda`
  event SetVeQoda(address veQodaAddress);
  
  /// @notice Emitted when setting `collateralFactor`
  event SetCollateralFactor(address indexed tokenAddress, uint oldValue, uint newValue);

  /// @notice Emitted when setting `marketFactor`
  event SetMarketFactor(address indexed tokenAddress, uint oldValue, uint newValue);

  /// @notice Emitted when setting `minQuoteSize`
  event SetMinQuoteSize(address indexed tokenAddress, uint oldValue, uint newValue);
  
  /// @notice Emitted when `_minCollateralRatioDefault` and `_initCollateralRatioDefault` get updated
  event SetCollateralRatio(uint oldMinValue, uint oldInitValue, uint newMinValue, uint newInitValue);
  
  /// @notice Emitted when `CreditFacility` gets updated
  event SetCreditFacility(address account, bool oldEnabled, uint oldMinValue, uint oldInitValue, uint oldCreditValue, bool newEnabled, uint newMinValue, uint newInitValue, uint newCreditValue);
  
  /// @notice Emitted when `_closeFactor` gets updated
  event SetCloseFactor(uint oldValue, uint newValue);

  /// @notice Emitted when `_repaymentGracePeriod` gets updated
  event SetRepaymentGracePeriod(uint oldValue, uint newValue);
  
  /// @notice Emitted when `_maturityGracePeriod` gets updated
  event SetMaturityGracePeriod(uint oldValue, uint newValue);
  
  /// @notice Emitted when `_liquidationIncentive` gets updated
  event SetLiquidationIncentive(uint oldValue, uint newValue);

  /// @notice Emitted when `_protocolFee` gets updated
  event SetProtocolFee(uint oldValue, uint newValue);
  
  /** ADMIN FUNCTIONS **/

  /// @notice Call upon initialization after deploying `QollateralManager` contract
  /// @param qollateralManagerAddress Address of `QollateralManager` deployment
  function _setQollateralManager(address qollateralManagerAddress) external;

  /// @notice Call upon initialization after deploying `StakingEmissionsQontroller` contract
  /// @param stakingEmissionsQontrollerAddress Address of `StakingEmissionsQontroller` deployment
  function _setStakingEmissionsQontroller(address stakingEmissionsQontrollerAddress) external;

  /// @notice Call upon initialization after deploying `TradingEmissionsQontroller` contract
  /// @param tradingEmissionsQontrollerAddress Address of `TradingEmissionsQontroller` deployment
  function _setTradingEmissionsQontroller(address tradingEmissionsQontrollerAddress) external;

  /// @notice Call upon initialization after deploying `FeeEmissionsQontroller` contract
  /// @param feeEmissionsQontrollerAddress Address of `FeeEmissionsQontroller` deployment
  function _setFeeEmissionsQontroller(address feeEmissionsQontrollerAddress) external;

  /// @notice Call upon initialization after deploying `veQoda` contract
  /// @param veQodaAddress Address of `veQoda` deployment
  function _setVeQoda(address veQodaAddress) external;
  
  /// @notice Set credit facility for specified account
  /// @param account_ account for credit facility adjustment
  /// @param enabled_ If credit facility should be enabled
  /// @param minCollateralRatio_ New minimum collateral ratio value
  /// @param initCollateralRatio_ New initial collateral ratio value
  /// @param creditLimit_ new credit limit in USD, scaled by 1e18
  function _setCreditFacility(address account_, bool enabled_, uint minCollateralRatio_, uint initCollateralRatio_, uint creditLimit_) external;
  
  /// @notice Admin function for adding new Assets. An Asset must be added before it
  /// can be used as collateral or borrowed. Note: We can create functionality for
  /// allowing borrows of a token but not using it as collateral by setting
  /// `collateralFactor` to zero.
  /// @param token ERC20 token corresponding to the Asset
  /// @param isYieldBearing True if token bears interest (eg aToken, cToken, mToken, etc)
  /// @param underlying Address of the underlying token
  /// @param oracleFeed Chainlink price feed address
  /// @param collateralFactor 0.0 to 1.0 (scaled to 1e8) for discounting risky assets
  /// @param marketFactor 0.0 to 1.0 (scaled to 1e8) for premium on risky borrows
  function _addAsset(
                     IERC20 token,
                     bool isYieldBearing,
                     address underlying,
                     address oracleFeed,
                     uint collateralFactor,
                     uint marketFactor
                     ) external;

  /// @notice Adds a new `FixedRateMarket` contract into the internal mapping of
  /// whitelisted market addresses
  /// @param marketAddress New `FixedRateMarket` contract address
  /// @param protocolFee_ Corresponding protocol fee in basis points
  /// @param minQuoteSize_ Size in PV terms, local currency
  function _addFixedRateMarket(
                               address marketAddress,
                               uint protocolFee_,
                               uint minQuoteSize_
                               ) external;
  
  /// @notice Update the `collateralFactor` for a given `Asset`
  /// @param token ERC20 token corresponding to the Asset
  /// @param collateralFactor 0.0 to 1.0 (scaled to 1e8) for discounting risky assets
  function _setCollateralFactor(IERC20 token, uint collateralFactor) external;

  /// @notice Update the `marketFactor` for a given `Asset`
  /// @param token Address of the token corresponding to the Asset
  /// @param marketFactor 0.0 to 1.0 (scaled to 1e8) for discounting risky assets
  function _setMarketFactor(IERC20 token, uint marketFactor) external;

  /// @notice Set the minimum quote size for a particular `FixedRateMarket`
  /// @param marketAddress Address of the `FixedRateMarket` contract
  /// @param minQuoteSize_ Size in PV terms, local currency
  function _setMinQuoteSize(address marketAddress, uint minQuoteSize_) external;
  
  /// @notice Set the global minimum and initial collateral ratio
  /// @param minCollateralRatio_ New global minimum collateral ratio value
  /// @param initCollateralRatio_ New global initial collateral ratio value
  function _setCollateralRatio(uint minCollateralRatio_, uint initCollateralRatio_) external;
  
  /// @notice Set the global close factor
  /// @param closeFactor_ New close factor value
  function _setCloseFactor(uint closeFactor_) external;

  /// @notice Set the global repayment grace period
  /// @param repaymentGracePeriod_ New repayment grace period
  function _setRepaymentGracePeriod(uint repaymentGracePeriod_) external;

  /// @notice Set the global maturity grace period
  /// @param maturityGracePeriod_ New maturity grace period
  function _setMaturityGracePeriod(uint maturityGracePeriod_) external;
  
  /// @notice Set the global liquidation incetive
  /// @param liquidationIncentive_ New liquidation incentive value
  function _setLiquidationIncentive(uint liquidationIncentive_) external;

  /// @notice Set the global annualized protocol fees for each market in basis points
  /// @param marketAddress Address of the `FixedRateMarket` contract
  /// @param protocolFee_ New protocol fee value (scaled to 1e4)
  function _setProtocolFee(address marketAddress, uint protocolFee_) external;
  
  /// @notice Set the global threshold in USD for protocol fee transfer
  /// @param thresholdUSD_ New threshold USD value (scaled by 1e6)
  function _setThresholdUSD(uint thresholdUSD_) external;
  
  /** VIEW FUNCTIONS **/

  function ADMIN_ROLE() external view returns(bytes32);

  function MARKET_ROLE() external view returns(bytes32);

  function MINTER_ROLE() external view returns(bytes32);

  function VETOKEN_ROLE() external view returns(bytes32);
  
  /// @notice Get the address of the `QollateralManager` contract
  function qollateralManager() external view returns(address);

  /// @notice Get the address of the `QPriceOracle` contract
  function qPriceOracle() external view returns(address);

  /// @notice Get the address of the `StakingEmissionsQontroller` contract
  function stakingEmissionsQontroller() external view returns(address);

  /// @notice Get the address of the `TradingEmissionsQontroller` contract
  function tradingEmissionsQontroller() external view returns(address);

  /// @notice Get the address of the `FeeEmissionsQontroller` contract
  function feeEmissionsQontroller() external view returns(address);

  /// @notice Get the address of the `veQoda` contract
  function veQoda() external view returns(address);

  /// @notice Get the credit limit with associated address, scaled by 1e18
  function creditLimit(address account_) external view returns(uint);
  
  /// @notice Gets the `Asset` mapped to the address of a ERC20 token
  /// @param token ERC20 token
  /// @return QTypes.Asset Associated `Asset`
  function assets(IERC20 token) external view returns(QTypes.Asset memory);

  /// @notice Get all enabled `Asset`s
  /// @return address[] iterable list of enabled `Asset`s
  function allAssets() external view returns(address[] memory);

  /// @notice Gets the `oracleFeed` associated with a ERC20 token
  /// @param token ERC20 token
  /// @return address Address of the oracle feed
  function oracleFeed(IERC20 token) external view returns(address);
  
  /// @notice Gets the `CollateralFactor` associated with a ERC20 token
  /// @param token ERC20 token
  /// @return uint Collateral Factor, scaled by 1e8
  function collateralFactor(IERC20 token) external view returns(uint);

  /// @notice Gets the `MarketFactor` associated with a ERC20 token
  /// @param token ERC20 token
  /// @return uint Market Factor, scaled by 1e8
  function marketFactor(IERC20 token) external view returns(uint);

  /// @notice Gets the `maturities` associated with a ERC20 token
  /// @param token ERC20 token
  /// @return uint[] array of UNIX timestamps (in seconds) of the maturity dates
  function maturities(IERC20 token) external view returns(uint[] memory);
  
  /// @notice Get the MToken market corresponding to any underlying ERC20
  /// tokenAddress => mTokenAddress
  function underlyingToMToken(IERC20 token) external view returns(address);
  
  /// @notice Gets the address of the `FixedRateMarket` contract
  /// @param token ERC20 token
  /// @param maturity UNIX timestamp of the maturity date
  /// @return address Address of `FixedRateMarket` contract
  function fixedRateMarkets(IERC20 token, uint maturity) external view returns(address);

  /// @notice Check whether an address is a valid FixedRateMarket address.
  /// Can be used for checks for inter-contract admin/restricted function call.
  /// @param marketAddress Address of the `FixedRateMarket` contract
  /// @return bool True if valid false otherwise
  function isMarketEnabled(address marketAddress) external view returns(bool);

  function minQuoteSize(address marketAddress) external view returns(uint);
  
  function minCollateralRatio() external view returns(uint);
  
  function minCollateralRatio(address account) external view returns(uint);
  
  function initCollateralRatio() external view returns(uint);
  
  function initCollateralRatio(address account) external view returns(uint);
  
  function closeFactor() external view returns(uint);

  function repaymentGracePeriod() external view returns(uint);
  
  function maturityGracePeriod() external view returns(uint);
  
  function liquidationIncentive() external view returns(uint);

  /// @notice Annualized protocol fee in basis points, scaled by 1e4
  function protocolFee(address marketAddress) external view returns(uint);

  /// @notice threshold in USD where protocol fee from each market will be transferred into `FeeEmissionsQontroller`
  /// once this amount is reached, scaled by 1e6
  function thresholdUSD() external view returns(uint);
  
  /// @notice 2**256 - 1
  function UINT_MAX() external pure returns(uint);
  
  /// @notice Generic mantissa corresponding to ETH decimals
  function MANTISSA_DEFAULT() external pure returns(uint);

  /// @notice Mantissa for USD
  function MANTISSA_USD() external pure returns(uint);
  
  /// @notice Mantissa for collateral ratio
  function MANTISSA_COLLATERAL_RATIO() external pure returns(uint);

  /// @notice `assetFactor` and `marketFactor` have up to 8 decimal places precision
  function MANTISSA_FACTORS() external pure returns(uint);

  /// @notice Basis points have 4 decimal place precision
  function MANTISSA_BPS() external pure returns(uint);

  /// @notice Staked Qoda has 6 decimal place precision
  function MANTISSA_STAKING() external pure returns(uint);

  /// @notice `collateralFactor` cannot be above 1.0
  function MAX_COLLATERAL_FACTOR() external pure returns(uint);

  /// @notice `marketFactor` cannot be above 1.0
  function MAX_MARKET_FACTOR() external pure returns(uint);

  /// @notice version number of this contract, will be bumped upon contractual change
  function VERSION_NUMBER() external pure returns(string memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

interface IQodaERC20 is IERC20, IERC20Metadata {
  
  /// @notice Mints tokens to a recipient, as long as it is under the
  /// supply cap. Reverts if the caller does not have the minter role.
  /// @param recipient Account to mint tokens to
  /// @param amount Amount of tokens to mint
  function mint(address recipient, uint amount) external returns(bool);
  
  function supplyCap() external view returns(uint);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

interface IStakingEmissionsQontroller {

  /** EVENTS **/
  
  /// @notice Emitted when we move to a new emissions regime
  event NewEmissionsPerBlock(uint indexed currentPeriod, uint startBlock, uint emissions, uint numBlocks);

  /// @notice Emitted when user claims emissions
  event ClaimEmissions(address indexed account, uint emission);
  
  /// @notice Emitted when user deposits
  event Deposit(address indexed account, uint amount);

  /// @notice Emitted when user withdraws
  event Withdraw(address indexed account, uint amount);
  
  /** ACCESS CONTROLLED FUNCTIONS **/
  
  /// @notice Credits the account with the given amount in `StakingEmissionsQontroller`
  /// This function should only be called by the veToken contract when the user
  /// claims their accrued veTokens.
  /// @param account Address of the user
  /// @param amount Amount to credit the account
  function deposit(address account, uint amount) external;

  /// @notice Cancels account's full amount and debt from `StakingEmissionsQontroller`
  /// and claims any remaining emissions for that account. This should only
  /// be called by the veToken contract when the user unstakes the underlying
  /// @param account Address of the user.
  function withdraw(address account) external;
  
  /// @notice Function to start reward distribution, can only be invoked once.
  /// @param startBlock starting block for reward distribution, 0 for current block
  function _startStaking(uint startBlock) external;

  /** USER INTERFACE **/

  /// @notice Transfer accrued emissions from `StakingEmissionsQontroller` to veToken holder
  /// This function can be called by the user anytime and as often as they wish.
  function claimEmissions() external;

  /// @notice Update emissions variables of the pool
  function updatePool() external;

  /** VIEW FUNCTIONS **/

  /// @notice Calculates the amount of emissions claimable by a user by updating
  /// the pool info in memory without writing to storage so that viewing the
  /// claimable amount does not incur gas costs.
  /// @param account Address of the user
  /// @return uint Amount claimable
  function claimableEmissions(address account) external view returns(uint);

  /// @notice Get the address of the `QAdmin` contract
  /// @return address Address of `QAdmin` contract
  function qAdmin() external view returns(address);
  
  /// @notice Get the address of the `QodaERC20` contract
  /// @return address Address of `QodaERC20` contract
  function qodaERC20() external view returns(address);

  /// @notice Get the address of the `veQoda` contract
  /// @return address Address of `veQoda` contract
  function veToken() external view returns(address);

  function numPeriods() external view returns(uint);
  
  function accTokenPerShare() external view returns(uint);

  function currentPeriod() external view returns(uint);

  function endBlock() external view returns(uint);

  function lastEmissionsBlock() external view returns(uint);

  function emissions() external view returns(uint);

  function numBlocks() external view returns(uint);

  // @return emissions per block, scaled by 1e6
  function emissionsPerBlock() external view returns(uint);

  function userInfo(address account) external view returns(uint, uint, uint);
  
  function stakingPeriod(uint i) external view returns(uint, uint);
  
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

library QTypes {

  /// @notice Contains all the details of an Asset. Assets  must be defined
  /// before they can be used as collateral.
  /// @member isEnabled True if an asset is defined, false otherwise
  /// @member isYieldBearing True if token bears interest (eg aToken, cToken, mToken, etc)
  /// @member underlying Address of the underlying token
  /// @member oracleFeed Address of the corresponding chainlink oracle feed
  /// @member collateralFactor 0.0 to 1.0 (scaled to 1e8) for discounting risky assets
  /// @member marketFactor 0.0 1.0 for premium on risky borrows
  /// @member maturities Iterable storage for all enabled maturities
  struct Asset {
    bool isEnabled;
    bool isYieldBearing;
    address underlying;
    address oracleFeed;
    uint collateralFactor;
    uint marketFactor;
    uint[] maturities;
  }
  
  /// @notice Contains all the fields of a created Quote
  /// @param id ID of the quote
  /// @param next Next quote in the list
  /// @param prev Previous quote in the list
  /// @param quoter Account of the Quoter
  /// @param quoteType 0 for PV+APR, 1 for FV+APR
  /// @param APR In decimal form scaled by 1e4 (ex. 10.52% = 1052)
  /// @param cashflow Can be PV or FV depending on `quoteType`
  /// @param filled Amount quote has got filled partially 
  struct Quote {
    uint64 id;
    uint64 next;
    uint64 prev;
    address quoter;
    uint8 quoteType;
    uint64 APR;
    uint cashflow;
    uint filled;
  }
  
  /// @notice Contains all the configurations customizable to an address
  /// @member enabled If config for an address is enabled. When enabled is false, credit limit is infinite even if value is 0
  /// @member minCollateralRatio If collateral ratio falls below `_minCollateralRatio`, it is subject to liquidation. Scaled by 1e8
  /// @member initCollateralRatio When initially taking a loan, collateral ratio must be higher than this. `initCollateralRatio` should always be higher than `minCollateralRatio`. Scaled by 1e8
  /// @member creditLimit Allowed limit in virtual USD for each address to do uncollateralized borrow, scaled by 1e18
  struct CreditFacility {
    bool enabled;
    uint minCollateralRatio;
    uint initCollateralRatio;
    uint creditLimit;
  }
}

// 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);
}

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

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