// 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: @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: @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/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/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: contracts/interfaces/IReserveOracle.sol



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

interface IReserveOracle {
  function activeMultiplier() external view returns (uint);
  function getCurrentPrice() external view returns (uint);
  function getCurrentMarketCap() external view returns (uint);
  function getCirculatingSupply() external view returns (uint);
  function getPercentageFromAth() external view returns (uint percentage);
  function setCurrentMultiplier() external returns (uint);
}
// File: contracts/interfaces/IRSRV.sol



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

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

interface IRSRV is IERC20 {
  function uniswapV2Router() external view returns (address);
  function uniswapV2Pair() external view returns (address);
  function mint(uint amount) external;
}
// File: contracts/interfaces/IUniswapV2Router02.sol



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

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    )
        external
        returns (
            uint amountA,
            uint amountB,
            uint liquidity
        );

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    )
        external
        payable
        returns (
            uint amountToken,
            uint amountETH,
            uint liquidity
        );

    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);

    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
// File: contracts/ReserveOracle.sol



// SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

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

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

import "./interfaces/IUniswapV2Router02.sol";
import "./interfaces/IReserveOracle.sol";
import "./interfaces/IRSRV.sol";

contract ReserveOracle is IReserveOracle, Ownable {
  using SafeMath for uint;

  IRSRV public token;
  address public reserve;
  address public WETH;
  address public uniswapV2Pair;
  uint public previousAthMarketCap;
  uint public timestampReset;
  uint public activeMultiplier = 10000;
  uint public baseMultiplier = 10000;
  uint public boostMultiplier = 10;
  uint public percentageForHalt = 4000;
  uint public percentageForReset = 2000;
  uint public startTime;
  uint public lastUpdateTime;
  uint public startThreshold = 1 weeks;
  uint public resetDelay = 1 days;
  uint public resetCooldown = 12 hours;

  uint private _lastMarketCap;
  uint private _lastPercentage = 10000;

  AggregatorV3Interface internal dataFeed;

  constructor(
    address _dataFeed
  ) {
    // GOERLI ETH/USD PRICE FEED: 0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e
    // MAINNET ETH/USD PRICE FEED: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
    dataFeed = AggregatorV3Interface(_dataFeed);
  }

  function getEthPrice() public view returns (uint) {
    (
      /* uint80 roundID */,
      int answer,
      /*uint startedAt*/,
      /*uint timeStamp*/,
      /*uint80 answeredInRound*/
    ) = dataFeed.latestRoundData();

    return uint(answer);
  }

  function getPriceData() 
    external 
    view 
  returns (
    uint price, 
    uint circulatingSupply, 
    uint marketCap, 
    uint lastMarketCap, 
    uint lastMultiplier, 
    uint lastPercentage
  ) {
    price = getCurrentPrice();
    circulatingSupply = getCirculatingSupply();
    marketCap = getCurrentMarketCap();
    lastMarketCap = _lastMarketCap;
    lastMultiplier = activeMultiplier;
    lastPercentage = _lastPercentage;
  }

  function getCurrentPrice() public view returns (uint) {
    return _getPriceInEth() * getEthPrice() / 1e8;
  }

  function getCurrentMarketCap() public view returns (uint) {
    return _getMarketCapinEth() * getEthPrice() / 1e8;
  }

  function getCirculatingSupply() public view returns (uint) {
    return IERC20(address(token)).totalSupply() -
      IERC20(address(token)).balanceOf(address(0xdead));
  }

  function getPercentageFromAth() external view returns (uint percentage) {
    if (previousAthMarketCap == 0) return 0;

    uint marketCap = getCurrentMarketCap();
    percentage = marketCap.mul(1e4).div(previousAthMarketCap);
  }

  function _getPriceInEth() internal view returns (uint) {
    uint wethBalance = IERC20(WETH).balanceOf(uniswapV2Pair);
    uint tokenBalance = IERC20(address(token)).balanceOf(uniswapV2Pair);
    return wethBalance.mul(1e18).div(tokenBalance);
  }

  function _getMarketCapinEth() internal view returns (uint) {
    return _getPriceInEth().mul(getCirculatingSupply()).div(1e18);
  }

  /** RESERVED FUNCTIONS **/

  function setCurrentMultiplier() external returns (uint) {
    require (_msgSender() == owner() || _msgSender() == address(reserve), "Not authorized");

    if (startTime == 0) startTime = block.timestamp;

    if (activeMultiplier == 1 && lastUpdateTime.add(resetCooldown) < block.timestamp) {
      return activeMultiplier;
    }

    lastUpdateTime = block.timestamp;

    uint marketCap = getCurrentMarketCap();
    _lastMarketCap = marketCap;
    if (previousAthMarketCap == 0) {
      previousAthMarketCap = marketCap;
      return activeMultiplier;
    } else {
      uint multiplier;
      if (marketCap >= previousAthMarketCap) {
        previousAthMarketCap = marketCap;
        multiplier = baseMultiplier;
        _lastPercentage = 10000;
        timestampReset = 0;
      } else {
        uint percentage = marketCap.mul(1e4).div(previousAthMarketCap);
        _lastPercentage = percentage;
        if (percentage >= percentageForHalt) {
          multiplier = baseMultiplier.add(uint(1e4).sub(percentage).mul(boostMultiplier));
          timestampReset = 0;
        } else if (percentage >= percentageForReset) {
          multiplier = 0;
          timestampReset = 0;
        } else {
          if (startTime.add(startThreshold) < block.timestamp) {
            if (timestampReset == 0) {
              timestampReset = block.timestamp;
              multiplier = 0;
            } else {
              if (timestampReset.add(resetDelay) < block.timestamp) {
                previousAthMarketCap = marketCap;
                multiplier = 1;
                startTime = block.timestamp;
                timestampReset = 0;
              } else {
                multiplier = 0;
              }
            }
          } else {
            multiplier = 0;
            timestampReset = 0;
          }
        }
      }

      activeMultiplier = multiplier;
      return activeMultiplier;
    }
  }

  function setToken(address _token) external onlyOwner {
    token = IRSRV(_token);
    uniswapV2Pair = token.uniswapV2Pair();

    IUniswapV2Router02 router = IUniswapV2Router02(token.uniswapV2Router());
    WETH = router.WETH();
  }

  function setReserve(address _reserve) external onlyOwner {
    require (_reserve != address(0), "Invalid reserve address");
    reserve = _reserve;
  }

  function setBaseMultiplier(uint _multiplier) external onlyOwner {
    baseMultiplier = _multiplier;
  }

  function setBoostMultiplier(uint _multiplier) external onlyOwner {
    boostMultiplier = _multiplier;
  }

  function setStartThreshold(uint _threshold) external onlyOwner {
    startThreshold = _threshold;
  }

  function setResetDelay(uint _resetDelay) external onlyOwner {
    resetDelay = _resetDelay;
  }

  function setResetCooldown(uint _resetCooldown) external onlyOwner {
    resetCooldown = _resetCooldown;
  }

  function setPercentages(uint _percentageForHalt, uint _percentageForReset) external onlyOwner {
    percentageForHalt = _percentageForHalt;
    percentageForReset = _percentageForReset;
  }
}