// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorInterface.sol



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

interface AggregatorInterface {
  function latestAnswer() external view returns (int256);

  function latestTimestamp() external view returns (uint256);

  function latestRound() external view returns (uint256);

  function getAnswer(uint256 roundId) external view returns (int256);

  function getTimestamp(uint256 roundId) external view returns (uint256);

  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);

  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV2V3Interface.sol



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

import "./AggregatorInterface.sol";
import "./AggregatorV3Interface.sol";

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol



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

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// File: @chainlink/contracts/src/v0.8/interfaces/FeedRegistryInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma abicoder v2;

import "./AggregatorV2V3Interface.sol";

interface FeedRegistryInterface {
  struct Phase {
    uint16 phaseId;
    uint80 startingAggregatorRoundId;
    uint80 endingAggregatorRoundId;
  }

  event FeedProposed(
    address indexed asset,
    address indexed denomination,
    address indexed proposedAggregator,
    address currentAggregator,
    address sender
  );
  event FeedConfirmed(
    address indexed asset,
    address indexed denomination,
    address indexed latestAggregator,
    address previousAggregator,
    uint16 nextPhaseId,
    address sender
  );

  // V3 AggregatorV3Interface

  function decimals(address base, address quote) external view returns (uint8);

  function description(address base, address quote) external view returns (string memory);

  function version(address base, address quote) external view returns (uint256);

  function latestRoundData(address base, address quote)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function getRoundData(
    address base,
    address quote,
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  // V2 AggregatorInterface

  function latestAnswer(address base, address quote) external view returns (int256 answer);

  function latestTimestamp(address base, address quote) external view returns (uint256 timestamp);

  function latestRound(address base, address quote) external view returns (uint256 roundId);

  function getAnswer(
    address base,
    address quote,
    uint256 roundId
  ) external view returns (int256 answer);

  function getTimestamp(
    address base,
    address quote,
    uint256 roundId
  ) external view returns (uint256 timestamp);

  // Registry getters

  function getFeed(address base, address quote) external view returns (AggregatorV2V3Interface aggregator);

  function getPhaseFeed(
    address base,
    address quote,
    uint16 phaseId
  ) external view returns (AggregatorV2V3Interface aggregator);

  function isFeedEnabled(address aggregator) external view returns (bool);

  function getPhase(
    address base,
    address quote,
    uint16 phaseId
  ) external view returns (Phase memory phase);

  // Round helpers

  function getRoundFeed(
    address base,
    address quote,
    uint80 roundId
  ) external view returns (AggregatorV2V3Interface aggregator);

  function getPhaseRange(
    address base,
    address quote,
    uint16 phaseId
  ) external view returns (uint80 startingRoundId, uint80 endingRoundId);

  function getPreviousRoundId(
    address base,
    address quote,
    uint80 roundId
  ) external view returns (uint80 previousRoundId);

  function getNextRoundId(
    address base,
    address quote,
    uint80 roundId
  ) external view returns (uint80 nextRoundId);

  // Feed management

  function proposeFeed(
    address base,
    address quote,
    address aggregator
  ) external;

  function confirmFeed(
    address base,
    address quote,
    address aggregator
  ) external;

  // Proposed aggregator

  function getProposedFeed(address base, address quote)
    external
    view
    returns (AggregatorV2V3Interface proposedAggregator);

  function proposedGetRoundData(
    address base,
    address quote,
    uint80 roundId
  )
    external
    view
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function proposedLatestRoundData(address base, address quote)
    external
    view
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  // Phases
  function getCurrentPhaseId(address base, address quote) external view returns (uint16 currentPhaseId);
}

// File: @openzeppelin/contracts/proxy/utils/Initializable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.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 = _setInitializedVersion(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) {
        bool isTopLevelCall = _setInitializedVersion(version);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _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 {
        _setInitializedVersion(type(uint8).max);
    }

    function _setInitializedVersion(uint8 version) private returns (bool) {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, and for the lowest level
        // of initializers, because in other contexts the contract may have been reentered.
        if (_initializing) {
            require(
                version == 1 && !Address.isContract(address(this)),
                "Initializable: contract is already initialized"
            );
            return false;
        } else {
            require(_initialized < version, "Initializable: contract is already initialized");
            _initialized = version;
            return true;
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// 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);
}

// File: @openzeppelin/contracts/utils/Address.sol



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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/math/Math.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

// File: @openzeppelin/contracts/utils/math/SafeCast.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// File: contracts/access/Governable.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../core/AddressProvider.sol";

/**
 * @notice Contract module which provides access control mechanism, where
 * the governor account is granted with exclusive access to specific functions.
 * @dev Uses the AddressProvider to get the governor
 */
abstract contract Governable {
    IAddressProvider public constant addressProvider = IAddressProvider(0xfbA0816A81bcAbBf3829bED28618177a2bf0e82A);

    /// @dev Throws if called by any account other than the governor.
    modifier onlyGovernor() {
        require(msg.sender == addressProvider.governor(), "not-governor");
        _;
    }
}

// File: contracts/core/AddressProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "../interfaces/core/IAddressProvider.sol";

contract AddressProvider is IAddressProvider, Initializable {
    /// @notice The governor account
    address public governor;

    /// @notice The proposed governor account. Becomes the new governor after acceptance
    address public proposedGovernor;

    /// @notice The PriceProvidersAggregator contract
    IPriceProvidersAggregator public override providersAggregator;

    /// @notice The StableCoinProvider contract
    IStableCoinProvider public override stableCoinProvider;

    /// @notice Emitted when providers aggregator is updated
    event ProvidersAggregatorUpdated(
        IPriceProvidersAggregator oldProvidersAggregator,
        IPriceProvidersAggregator newProvidersAggregator
    );

    /// @notice Emitted when stable coin provider is updated
    event StableCoinProviderUpdated(
        IStableCoinProvider oldStableCoinProvider,
        IStableCoinProvider newStableCoinProvider
    );

    /// @notice Emitted when governor is updated
    event UpdatedGovernor(address indexed previousGovernor, address indexed proposedGovernor);

    /**
     * @dev Throws if called by any account other than the governor.
     */
    modifier onlyGovernor() {
        require(governor == msg.sender, "not-governor");
        _;
    }

    function initialize(address governor_) external initializer {
        governor = governor_;
        emit UpdatedGovernor(address(0), governor_);
    }

    /**
     * @dev Allows new governor to accept governorship of the contract.
     */
    function acceptGovernorship() external {
        require(msg.sender == proposedGovernor, "not-the-proposed-governor");
        emit UpdatedGovernor(governor, proposedGovernor);
        governor = proposedGovernor;
        proposedGovernor = address(0);
    }

    /**
     * @dev Transfers governorship of the contract to a new account (`proposedGovernor`).
     * Can only be called by the current owner.
     */
    function transferGovernorship(address _proposedGovernor) external onlyGovernor {
        require(_proposedGovernor != address(0), "proposed-governor-is-zero");
        proposedGovernor = _proposedGovernor;
    }

    /**
     * @notice Update PriceProvidersAggregator contract
     */
    function updateProvidersAggregator(IPriceProvidersAggregator providersAggregator_) external onlyGovernor {
        require(address(providersAggregator_) != address(0), "address-is-null");
        emit ProvidersAggregatorUpdated(providersAggregator, providersAggregator_);
        providersAggregator = providersAggregator_;
    }

    /**
     * @notice Update StableCoinProvider contract
     */
    function updateStableCoinProvider(IStableCoinProvider stableCoinProvider_) external onlyGovernor {
        emit StableCoinProviderUpdated(stableCoinProvider, stableCoinProvider_);
        stableCoinProvider = stableCoinProvider_;
    }
}

// File: contracts/core/ChainlinkFeedPriceProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@chainlink/contracts/src/v0.8/interfaces/FeedRegistryInterface.sol";
import "./ChainlinkPriceProvider.sol";
import "../libraries/OracleHelpers.sol";

/**
 * @title ChainLink's price provider that uses price feed (only available on Mainnet currently)
 * @dev This contract is more expensive (+ ~1.3k) than others contracts (that don't use feed)
 * because they get decimals during aggregator addition
 */
contract ChainlinkFeedPriceProvider is ChainlinkPriceProvider {
    using SafeCast for int256;
    using OracleHelpers for uint256;

    address public constant USD = address(840); // Chainlink follows https://en.wikipedia.org/wiki/ISO_4217
    address public constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address public constant BTC = 0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB;
    FeedRegistryInterface public constant PRICE_FEED =
        FeedRegistryInterface(0x47Fb2585D2C56Fe188D0E6ec628a38b74fCeeeDf);
    address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address public constant WBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;

    /// @inheritdoc IPriceProvider
    function getPriceInUsd(address token_) public view override returns (uint256 _priceInUsd, uint256 _lastUpdatedAt) {
        int256 _price;

        AggregatorV3Interface _aggregator = aggregators[token_];
        if (address(_aggregator) != address(0)) {
            (, _price, , _lastUpdatedAt, ) = _aggregator.latestRoundData();
            return (_price.toUint256() * TO_SCALE, _lastUpdatedAt);
        }

        if (token_ == WETH) {
            token_ = ETH;
        } else if (token_ == WBTC) {
            token_ = BTC;
        }
        (, _price, , _lastUpdatedAt, ) = PRICE_FEED.latestRoundData(token_, USD);
        _priceInUsd = _price.toUint256().scaleDecimal(PRICE_FEED.decimals(token_, USD), USD_DECIMALS);
    }
}

// File: contracts/core/ChainlinkPriceProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@openzeppelin/contracts/utils/math/SafeCast.sol";
import "../interfaces/core/IChainlinkPriceProvider.sol";
import "./PriceProvider.sol";
import "../access/Governable.sol";

/**
 * @title ChainLink's price provider
 * @dev This contract wraps chainlink aggregators
 */
contract ChainlinkPriceProvider is IChainlinkPriceProvider, PriceProvider, Governable {
    using SafeCast for int256;

    uint256 public constant CHAINLINK_DECIMALS = 8;
    uint256 public constant TO_SCALE = 10**(USD_DECIMALS - CHAINLINK_DECIMALS);

    /**
     * @notice Aggregators map (token => aggregator)
     */
    mapping(address => AggregatorV3Interface) public aggregators;

    /// Emitted when an aggregator is updated
    event AggregatorUpdated(address token, AggregatorV3Interface oldAggregator, AggregatorV3Interface newAggregator);

    /// @inheritdoc IPriceProvider
    function getPriceInUsd(address token_)
        public
        view
        virtual
        override(IPriceProvider, PriceProvider)
        returns (uint256 _priceInUsd, uint256 _lastUpdatedAt)
    {
        AggregatorV3Interface _aggregator = aggregators[token_];
        require(address(_aggregator) != address(0), "token-without-aggregator");
        int256 _price;
        (, _price, , _lastUpdatedAt, ) = _aggregator.latestRoundData();
        return (_price.toUint256() * TO_SCALE, _lastUpdatedAt);
    }

    /// @inheritdoc IChainlinkPriceProvider
    function updateAggregator(address token_, AggregatorV3Interface aggregator_) external override onlyGovernor {
        require(token_ != address(0), "token-is-null");
        AggregatorV3Interface _current = aggregators[token_];
        require(aggregator_ != _current, "same-as-current");
        _setAggregator(token_, aggregator_);
        emit AggregatorUpdated(token_, _current, aggregator_);
    }

    function _setAggregator(address token_, AggregatorV3Interface aggregator_) internal {
        require(address(aggregator_) == address(0) || aggregator_.decimals() == CHAINLINK_DECIMALS, "invalid-decimals");
        aggregators[token_] = aggregator_;
    }
}

// File: contracts/core/PriceProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@openzeppelin/contracts/utils/math/Math.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../interfaces/core/IPriceProvider.sol";

/**
 * @title Price providers' super class that implements common functions
 */
abstract contract PriceProvider is IPriceProvider {
    uint256 public constant USD_DECIMALS = 18;

    /// @inheritdoc IPriceProvider
    function getPriceInUsd(address token_) public view virtual returns (uint256 _priceInUsd, uint256 _lastUpdatedAt);

    /// @inheritdoc IPriceProvider
    function quote(
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    )
        external
        view
        virtual
        override
        returns (
            uint256 _amountOut,
            uint256 _tokenInLastUpdatedAt,
            uint256 _tokenOutLastUpdatedAt
        )
    {
        uint256 _amountInUsd;
        (_amountInUsd, _tokenInLastUpdatedAt) = quoteTokenToUsd(tokenIn_, amountIn_);
        (_amountOut, _tokenOutLastUpdatedAt) = quoteUsdToToken(tokenOut_, _amountInUsd);
    }

    /// @inheritdoc IPriceProvider
    function quoteTokenToUsd(address token_, uint256 amountIn_)
        public
        view
        override
        returns (uint256 _amountOut, uint256 _lastUpdatedAt)
    {
        uint256 _price;
        (_price, _lastUpdatedAt) = getPriceInUsd(token_);
        _amountOut = (amountIn_ * _price) / 10**IERC20Metadata(token_).decimals();
    }

    /// @inheritdoc IPriceProvider
    function quoteUsdToToken(address token_, uint256 amountIn_)
        public
        view
        override
        returns (uint256 _amountOut, uint256 _lastUpdatedAt)
    {
        uint256 _price;
        (_price, _lastUpdatedAt) = getPriceInUsd(token_);
        _amountOut = (amountIn_ * 10**IERC20Metadata(token_).decimals()) / _price;
    }
}

// File: contracts/interfaces/core/IAddressProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./IStableCoinProvider.sol";
import "./IPriceProvidersAggregator.sol";

interface IAddressProvider {
    function governor() external view returns (address);

    function providersAggregator() external view returns (IPriceProvidersAggregator);

    function stableCoinProvider() external view returns (IStableCoinProvider);
}

// File: contracts/interfaces/core/IChainlinkPriceProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "./IPriceProvider.sol";

interface IChainlinkPriceProvider is IPriceProvider {
    /**
     * @notice Update token's aggregator
     */
    function updateAggregator(address token_, AggregatorV3Interface aggregator_) external;
}

// File: contracts/interfaces/core/IPriceProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface IPriceProvider {
    /**
     * @notice Get USD (or equivalent) price of an asset
     * @param token_ The address of asset
     * @return _priceInUsd The USD price
     * @return _lastUpdatedAt Last updated timestamp
     */
    function getPriceInUsd(address token_) external view returns (uint256 _priceInUsd, uint256 _lastUpdatedAt);

    /**
     * @notice Get quote
     * @param tokenIn_ The address of assetIn
     * @param tokenOut_ The address of assetOut
     * @param amountIn_ Amount of input token
     * @return _amountOut Amount out
     * @return _tokenInLastUpdatedAt Last updated timestamp of `tokenIn_`
     * @return _tokenOutLastUpdatedAt Last updated timestamp of `tokenOut_`
     */
    function quote(
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    )
        external
        view
        returns (
            uint256 _amountOut,
            uint256 _tokenInLastUpdatedAt,
            uint256 _tokenOutLastUpdatedAt
        );

    /**
     * @notice Get quote in USD (or equivalent) amount
     * @param token_ The address of assetIn
     * @param amountIn_ Amount of input token.
     * @return amountOut_ Amount in USD
     * @return _lastUpdatedAt Last updated timestamp
     */
    function quoteTokenToUsd(address token_, uint256 amountIn_)
        external
        view
        returns (uint256 amountOut_, uint256 _lastUpdatedAt);

    /**
     * @notice Get quote from USD (or equivalent) amount to amount of token
     * @param token_ The address of assetOut
     * @param amountIn_ Input amount in USD
     * @return _amountOut Output amount of token
     * @return _lastUpdatedAt Last updated timestamp
     */
    function quoteUsdToToken(address token_, uint256 amountIn_)
        external
        view
        returns (uint256 _amountOut, uint256 _lastUpdatedAt);
}

// File: contracts/interfaces/core/IPriceProvidersAggregator.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../../libraries/DataTypes.sol";
import "./IPriceProvider.sol";

/**
 * @notice PriceProvidersAggregator interface
 * @dev Worth noting that the `_lastUpdatedAt` logic depends on the underlying price provider. In summary:
 * ChainLink: returns the last updated date from the aggregator
 * UniswapV2: returns the date of the latest pair oracle update
 * UniswapV3: assumes that the price is always updated (returns block.timestamp)
 * Flux: returns the last updated date from the aggregator
 * Umbrella (FCD): returns the last updated date returned from their oracle contract
 * Umbrella (Passport): returns the date of the latest pallet submission
 * Anytime that a quote performs more than one query, it uses the oldest date as the `_lastUpdatedAt`.
 * See more: https://github.com/bloqpriv/one-oracle/issues/64
 */
interface IPriceProvidersAggregator {
    /**
     * @notice Get USD (or equivalent) price of an asset
     * @param provider_ The price provider to get quote from
     * @param token_ The address of asset
     * @return _priceInUsd The USD price
     * @return _lastUpdatedAt Last updated timestamp
     */
    function getPriceInUsd(DataTypes.Provider provider_, address token_)
        external
        view
        returns (uint256 _priceInUsd, uint256 _lastUpdatedAt);

    /**
     * @notice Provider Providers' mapping
     */
    function priceProviders(DataTypes.Provider provider_) external view returns (IPriceProvider _priceProvider);

    /**
     * @notice Get quote
     * @param provider_ The price provider to get quote from
     * @param tokenIn_ The address of assetIn
     * @param tokenOut_ The address of assetOut
     * @param amountIn_ Amount of input token
     * @return _amountOut Amount out
     * @return _tokenInLastUpdatedAt Last updated timestamp of `tokenIn_`
     * @return _tokenOutLastUpdatedAt Last updated timestamp of `tokenOut_`
     */
    function quote(
        DataTypes.Provider provider_,
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    )
        external
        view
        returns (
            uint256 _amountOut,
            uint256 _tokenInLastUpdatedAt,
            uint256 _tokenOutLastUpdatedAt
        );

    /**
     * @notice Get quote
     * @dev If providers aren't the same, uses native token as "bridge"
     * @param providerIn_ The price provider to get quote for the tokenIn
     * @param tokenIn_ The address of assetIn
     * @param providerOut_ The price provider to get quote for the tokenOut
     * @param tokenOut_ The address of assetOut
     * @param amountIn_ Amount of input token
     * @return _amountOut Amount out
     * @return _tokenInLastUpdatedAt Last updated timestamp of `tokenIn_`
     * @return _nativeTokenLastUpdatedAt Last updated timestamp of native token (i.e. WETH) used when providers aren't the same
     * @return _tokenOutLastUpdatedAt Last updated timestamp of `tokenOut_`
     */
    function quote(
        DataTypes.Provider providerIn_,
        address tokenIn_,
        DataTypes.Provider providerOut_,
        address tokenOut_,
        uint256 amountIn_
    )
        external
        view
        returns (
            uint256 _amountOut,
            uint256 _tokenInLastUpdatedAt,
            uint256 _nativeTokenLastUpdatedAt,
            uint256 _tokenOutLastUpdatedAt
        );

    /**
     * @notice Get quote in USD (or equivalent) amount
     * @param provider_ The price provider to get quote from
     * @param token_ The address of assetIn
     * @param amountIn_ Amount of input token.
     * @return amountOut_ Amount in USD
     * @return _lastUpdatedAt Last updated timestamp
     */
    function quoteTokenToUsd(
        DataTypes.Provider provider_,
        address token_,
        uint256 amountIn_
    ) external view returns (uint256 amountOut_, uint256 _lastUpdatedAt);

    /**
     * @notice Get quote from USD (or equivalent) amount to amount of token
     * @param provider_ The price provider to get quote from
     * @param token_ The address of assetOut
     * @param amountIn_ Input amount in USD
     * @return _amountOut Output amount of token
     * @return _lastUpdatedAt Last updated timestamp
     */
    function quoteUsdToToken(
        DataTypes.Provider provider_,
        address token_,
        uint256 amountIn_
    ) external view returns (uint256 _amountOut, uint256 _lastUpdatedAt);

    /**
     * @notice Set a price provider
     * @dev Administrative function
     * @param provider_ The provider (from enum)
     * @param priceProvider_ The price provider contract
     */
    function setPriceProvider(DataTypes.Provider provider_, IPriceProvider priceProvider_) external;
}

// File: contracts/interfaces/core/IStableCoinProvider.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface IStableCoinProvider {
    /**
     * @notice Return the stable coin if pegged
     * @dev Check price relation between both stable coins and revert if peg is too loose
     * @return _stableCoin The primary stable coin if pass all checks
     */
    function getStableCoinIfPegged() external view returns (address _stableCoin);

    /**
     * @notice Convert given amount of stable coin to USD representation (18 decimals)
     */
    function toUsdRepresentation(uint256 stableCoinAmount_) external view returns (uint256 _usdAmount);
}

// File: contracts/libraries/DataTypes.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

library DataTypes {
    /**
     * @notice Price providers enumeration
     */
    enum Provider {
        NONE,
        CHAINLINK,
        UNISWAP_V3,
        UNISWAP_V2,
        SUSHISWAP,
        TRADERJOE,
        PANGOLIN,
        QUICKSWAP,
        UMBRELLA_FIRST_CLASS,
        UMBRELLA_PASSPORT,
        FLUX
    }

    enum ExchangeType {
        UNISWAP_V2,
        SUSHISWAP,
        TRADERJOE,
        PANGOLIN,
        QUICKSWAP,
        UNISWAP_V3,
        PANCAKE_SWAP
    }

    enum SwapType {
        EXACT_INPUT,
        EXACT_OUTPUT
    }
}

// File: contracts/libraries/OracleHelpers.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

library OracleHelpers {
    function scaleDecimal(
        uint256 amount,
        uint256 _fromDecimal,
        uint256 _toDecimal
    ) internal pure returns (uint256) {
        if (_fromDecimal > _toDecimal) {
            return amount / (10**(_fromDecimal - _toDecimal));
        } else if (_fromDecimal < _toDecimal) {
            return amount * (10**(_toDecimal - _fromDecimal));
        }
        return amount;
    }
}