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// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.8.19 <0.9.0;
import "./IDAO.sol";

/// @title exchange rate - the contract to receive quotes from oracle.
contract exchangeRateContract{

    /// @notice DAO interface.
    IDAO immutable dao;

    /// @notice Counter for instruments.
    uint16 public instrumentsCount;

    /// @notice Gas price to pay if someone wants the oracle to send a quote update out of schedule for one instrument.
    uint256 constant public updOnePriceGasCost = 84928;

    /// @notice Gas price to pay if someone wants the oracle to send a quote update out of schedule for several instruments.
    uint256 constant public updSeveralPricesCost = 87742;

    /// @notice Gas price to pay if someone wants the oracle to send a quote update out of schedule for every additional instrument in a bundle.
    uint256 constant public updAdditionalPrice = 22700;

    /// @notice Address of the author of this contract.
    address public author;

    /// @notice Address to receive profit gained by this contract from out-of-schedule updates.
    address public beneficiary;

    /// @notice Authorized address to send updates.
    address public updater;

    /// @notice The contract may be finalized, which means the beneficiary address cannot be changed anymore.
    bool public finalized;

    struct Instrument {
        uint256 price;
        uint128 timeStamp;
    }

    struct InstrumentDescription {
        uint16 id;
        string name;
        uint8 decimals;
    }

    /// @notice Instrument storage.
    mapping(uint16 => Instrument) public instruments;

    /// @notice InstrumentDescription dictionary.
    mapping(string => InstrumentDescription) public dictionary;

    /// @notice Constructor for the exchangeRateContract contract.
    /// @param _INTDAOaddress The address of the main DAO contract.
    constructor(address _INTDAOaddress) payable{
        dao = IDAO(_INTDAOaddress);
        author = msg.sender;
        updater = msg.sender;
        beneficiary = msg.sender;
    }

    modifier onlyAuthor{
        require(msg.sender == author, "author only");
        _;
    }

    modifier onlyUpdater{
        require(msg.sender == updater, "updater only");
        _;
    }

    /// @notice Emitted when someone requests to update a single quote.
    /// @param id ID of the instrument.
    event priceUpdateRequest (uint16 id);

    /// @notice Emitted when someone requests to update several quotes.
    /// @param ids Array of IDs.
    event severalPricesUpdateRequest (uint16[] ids);

    /// @notice Emitted when the price of a certain instrument is updated.
    /// @param id ID of the instrument.
    event priceUpdated (uint16 id);

    /// @notice Event for transferring the profit of the contract.
    /// @param profit Amount of profit obtained.
    event profit (uint256 profit);

    /// @notice Event emitted when the price of a given instrument changes more than the highVolatilityEventBarrierPercent from DAO.
    /// @param id ID of the instrument.
    event highVolatility(uint16 id);

    /// @notice Change the address to receive profit.
    /// @param newAddress New address.
    function changeBeneficiaryAddress(address payable newAddress) external onlyAuthor{
        require(!finalized, "finalized");
        beneficiary = newAddress;
    }

    /// @notice Make the change of the beneficiary address impossible.
    function finalize() external  onlyAuthor{
        require(!finalized, "finalized");
        finalized = true;
    }

    /// @notice Change the address to receive transactions with quotes.
    /// @param newAddress New address
    function changeUpdaterAddress (address payable newAddress) external onlyAuthor{
        updater = newAddress;
    }

    /// @notice Request a price update. A payable function.
    /// @param id ID of the instrument.
    function requestPriceUpdate(uint16 id) external payable {
        require (msg.value>=2*updOnePriceGasCost*tx.gasprice, "need more ether");
        emit priceUpdateRequest(id);
    }

    /// @notice Request multiple prices update.
    /// @param ids Array of IDs.
    function requestMultiplePricesUpdate(uint16[] memory ids) external payable {
        require (msg.value>= 2 * (ids.length * updAdditionalPrice + updSeveralPricesCost) * tx.gasprice, "need more ether");
        emit severalPricesUpdateRequest(ids);
    }

    /// @notice Update several prices. Only the updater address may invoke it.
    /// @param ids Array of IDs
    /// @param ids Array of prices
    function updateSeveralPrices(uint16[] memory ids, uint256[] memory prices) external onlyUpdater{
        uint length = ids.length;
        require(length==prices.length, "arrays length");
        for (uint16 i = 0; i < length;) {
            updPrice(ids[i], prices[i]);
            unchecked {
                ++i;
            }
        }
    }

    /// @notice Method to transfer profit.
    function transferProfit() external{
        payable(beneficiary).transfer(address(this).balance);
        emit profit(address(this).balance);
    }

    /// @notice Method to update a single price.
    /// @param id ID of the instrument.
    /// @param newPrice New price.
    function updateSinglePrice(uint16 id, uint256 newPrice) external onlyUpdater{
        updPrice (id, newPrice);
    }

    function updPrice(uint16 id, uint256 newPrice) internal {
        instruments[id].timeStamp = uint128(block.timestamp);
        uint256 prevPrice = instruments[id].price;
        uint256 move;
        if (prevPrice!=0){
            if (prevPrice >= newPrice)
                move = prevPrice - newPrice;
            else
                move = newPrice - prevPrice;
            if ((move * 100) / prevPrice > dao.params("highVolatilityEventBarrierPercent"))
                emit highVolatility(id);
        }
        instruments[id].price = newPrice;
        emit priceUpdated(id);
    }

    /// @notice Method to add an instrument to storage. It is for updater only.
    /// @param symbol Symbol of the instrument.
    /// @param name Name of the instrument.
    /// @param decimals Number of decimals in the price.
    /// @return id ID of the new instrument.
    function addInstrument(string memory symbol, string memory name, uint8 decimals) external onlyUpdater returns (uint16 id){
        InstrumentDescription storage newInstrumentDescription = dictionary[symbol];
        require (bytes(newInstrumentDescription.name).length == 0, "symbol already exist, use updateInstrument");
        newInstrumentDescription.id = ++instrumentsCount;
        newInstrumentDescription.name = name;
        newInstrumentDescription.decimals = decimals;
        instruments[newInstrumentDescription.id].timeStamp = uint128(block.timestamp);
        return newInstrumentDescription.id;
    }

    /// @notice Method to update the name and decimals of the instrument. For updater only.
    /// @param symbol Symbol of the instrument.
    /// @param name Name of the instrument.
    /// @param decimals Number of decimals in the price.
    function updateInstrument(string memory symbol, string memory name, uint8 decimals) external onlyUpdater{
        InstrumentDescription storage newInstrumentDescription = dictionary[symbol];
        require(bytes(newInstrumentDescription.name).length != 0,
            "Symbol doesn't exist, use addInstrument");
        newInstrumentDescription.name = name;
        newInstrumentDescription.decimals = decimals;
    }

    /// @notice Getter of the current price of the instrument.
    /// @param symbol Symbol of the instrument.
    /// @return Price.
    function getPrice(string memory symbol) external view returns (uint256) {
        return instruments[dictionary[symbol].id].price;
    }

    /// @notice Getter of the last time the price was updated for the given instrument.
    /// @param symbol Symbol of the instrument
    /// @return timeStamp
    function timeStamp(string memory symbol) external view returns (uint256) {
        return instruments[dictionary[symbol].id].timeStamp;
    }

    /// @notice Getter of decimals for the given instrument.
    /// @param symbol Symbol of the instrument
    /// @return decimals
    function getDecimals(string memory symbol) external view returns (uint8) {
        return dictionary[symbol].decimals;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.8.19 <0.9.0;

interface IDAO{
    function addresses(string memory) external view returns (address);
    function params(string memory) external view returns (uint256);
    function isAuthorized(address candidate) external view returns (bool);
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "cancun",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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00000000000000000000000055ead3b40016b1d5417f5a20f2d1e53e2d1c9122

-----Decoded View---------------
Arg [0] : _INTDAOaddress (address): 0x55Ead3b40016b1d5417F5A20F2d1E53e2d1c9122

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000055ead3b40016b1d5417f5a20f2d1e53e2d1c9122