// File: /contracts/PriceOracle.sol



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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "./Withdrawable.sol";
import "./PriceOracleInterface.sol";


contract PriceOracle is Ownable, Withdrawable, PriceOracleInterface {

    uint256 private baseQuote;
    uint256 private baseQuoteDecimals;
    uint16 private baseQuoteDevianceMax;    
    uint32 private quoteMaxAgeInSeconds;
    
    address private externalOracle;

    event MaxAgeConfigurationChanged(uint32 ageinseconds);
    event MaxDevianceConfigurationChanged(uint16 percentile);
    event BaseQuoteConfigurationChanged(uint256 quote, uint256 decimals);
    event ExternalOracleConfigurationChanged(address externaloracleaddress);

    function SetQuoteMaxAge(uint32 ageInSeconds) public onlyOwner {
      require(ageInSeconds != 0, "Quote age cannot be zero");
      quoteMaxAgeInSeconds = ageInSeconds;
      emit MaxAgeConfigurationChanged(ageInSeconds);
    }

    function SetMaximumBaseQuoteDeviance(uint16 percentile) public onlyOwner {

      require(percentile != 0, "Quote deviance cannot be zero");      
      baseQuoteDevianceMax = percentile;

      emit MaxDevianceConfigurationChanged(percentile);
    }

    function SetBaseQuote(uint256 quote, uint256 decimals) public onlyOwner {

      require(quote != 0, "Quote value cannot be zero");
      require(decimals != 0, "Quote decimals cannot be zero");
      baseQuote = quote;
      baseQuoteDecimals = decimals;
      emit BaseQuoteConfigurationChanged(quote, decimals);
    }

    function SetExternalOracle(address externalOracleAddress) public onlyOwner
    {
        externalOracle = externalOracleAddress;
        emit ExternalOracleConfigurationChanged(externalOracleAddress);
    }

    function getQuoteFromExternalOracle() private view returns(PriceOracleStructures.PriceOracleData memory) {
      
      require(externalOracle != address(0));
      PriceOracleStructures.PriceOracleData memory result;

      AggregatorV3Interface oracle = AggregatorV3Interface(externalOracle);

      (result.roundId,
      result.answer,
      result.startedAt,
      result.updatedAt,
      result.answeredInRound) = oracle.latestRoundData();

      result.decimals = oracle.decimals();

      return result;

    }

    function getQuote() view public returns(PriceOracleStructures.PriceOracleData memory)
    {
      return getQuoteFromExternalOracle();
    }

    function IsQuoteTooOld(PriceOracleStructures.PriceOracleData memory quote) view public returns(bool) 
    {

      return false;

      require(quoteMaxAgeInSeconds != 0, "Quote age configuation not set, cannot determine if its too old");
      require(quote.decimals == baseQuoteDecimals, "Decimals of base quote do not match quote of oracle");
      
      
      return false;
    }

    function IsQuoteTooDeviant(PriceOracleStructures.PriceOracleData memory quote) view public returns(bool) 
    {
      
      return false;

      require(baseQuote !=0, "Base quote not set cannot determine if its deviant");
      require(baseQuoteDevianceMax != 0, "Deviance tolerance not set, cannot determine if its deviant");
      require(quote.decimals == baseQuoteDecimals, "Decimals of base quote do not match quote of oracle");
      
      return false;
    }

}

// File: /contracts/Withdrawable.sol



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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract Withdrawable is Ownable {
 
  event ERC20Withdrawal(address tokenContract, uint256 tokenQuantity, address destinationAddress);
  event ETHWithdrawal(uint256 ethQuantity, address destinationAddress);

  function withdrawERC20(address tokenContract, uint256 tokenQuantity, address destinationAddress) public onlyOwner  {

    require(tokenContract != address(0));
    require(tokenQuantity != 0);
    require(destinationAddress != address(0));

    IERC20 contractInterface = IERC20(tokenContract);
    //contractInterface.approve(address(this), tokenQuantity);
    contractInterface.transfer(destinationAddress, tokenQuantity);

    emit ERC20Withdrawal(tokenContract,tokenQuantity,destinationAddress);

  }

  function withdrawETH(uint256 ethQuantity, address destinationAddress) public onlyOwner {
    
    require(ethQuantity != 0);
    require(destinationAddress != address(0));

    (bool success, ) = destinationAddress.call{value: ethQuantity}("");

    if (success)
      emit ETHWithdrawal(ethQuantity, destinationAddress);

  }

}

// File: /contracts/PriceOracleInterface.sol



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

interface PriceOracleInterface
{
     function getQuote() external view returns(PriceOracleStructures.PriceOracleData memory);

     function IsQuoteTooDeviant(PriceOracleStructures.PriceOracleData memory quote) external view returns(bool) ;

     function IsQuoteTooOld(PriceOracleStructures.PriceOracleData memory quote) external view returns(bool) ;
     
}

library PriceOracleStructures
{
    struct PriceOracleData
          {
            uint8 decimals;
            uint80 roundId;
            int256 answer;
            uint256 startedAt;
            uint256 updatedAt; 
            uint80 answeredInRound;
          }
}
// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// 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);
}