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// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import {IAggregatorPricingOnly} from '../interfaces/IAggregatorPricingOnly.sol';

/**
 * This contract sits in front of a VNXAU Chainlink aggregator and
 * converts the price from USD / troy ounce to USD / gram of gold.
 */
contract VNXAUGramOracle is IAggregatorPricingOnly {
    int256 public constant GRAM_PER_TROYOUNCE = int256(31.1034768 * 1e8);
    address public immutable VNXAU_AGGR_ADDR;

    constructor(address _aggregator) {
        VNXAU_AGGR_ADDR = _aggregator;
    }

    /**
     * @dev Fallback function that passes through calls to the address returned by `VNXAU_AGGR_ADDR`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable {
        _passthrough(VNXAU_AGGR_ADDR);
    }

    /**
     * @dev Fallback function that passes through calls to the address returned by `VNXAU_AGGR_ADDR`. Will run if call data
     * is empty.
     */
    receive() external payable {
        _passthrough(VNXAU_AGGR_ADDR);
    }

    /**
     * @dev Passes through the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _passthrough(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            // call contract at address a with input mem[in…(in+insize)) providing
            // g gas and v wei and output area mem[out…(out+outsize))
            // returning 0 on error (eg. out of gas) and 1 on success
            let result := call(
                gas(), // gas
                implementation, // to
                0, // don't transfer any ether
                0, // pointer to start of input
                calldatasize(),
                0,
                0
            )

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    function latestRoundData()
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (roundId, answer, startedAt, updatedAt, answeredInRound) = IAggregatorPricingOnly(VNXAU_AGGR_ADDR)
            .latestRoundData();
        answer = (answer * 1e8) / GRAM_PER_TROYOUNCE;
    }

    function latestAnswer() external view override returns (int256) {
        return (IAggregatorPricingOnly(VNXAU_AGGR_ADDR).latestAnswer() * 1e8) / GRAM_PER_TROYOUNCE;
    }

    function getAnswer(uint256 roundId) external view override returns (int256) {
        return (IAggregatorPricingOnly(VNXAU_AGGR_ADDR).getAnswer(roundId) * 1e8) / GRAM_PER_TROYOUNCE;
    }

    // IAggregatorPricingOnly
    function getRoundData(
        uint80 _roundId
    )
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (roundId, answer, startedAt, updatedAt, answeredInRound) = IAggregatorPricingOnly(VNXAU_AGGR_ADDR).getRoundData(
            _roundId
        );
        answer = (answer * 1e8) / GRAM_PER_TROYOUNCE;
    }

    function proposedGetRoundData(
        uint80 roundId
    )
        external
        view
        override
        returns (uint80 id, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (id, answer, startedAt, updatedAt, answeredInRound) = IAggregatorPricingOnly(VNXAU_AGGR_ADDR)
            .proposedGetRoundData(roundId);
        answer = (answer * 1e8) / GRAM_PER_TROYOUNCE;
    }

    function proposedLatestRoundData()
        external
        view
        override
        returns (uint80 id, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (id, answer, startedAt, updatedAt, answeredInRound) = IAggregatorPricingOnly(VNXAU_AGGR_ADDR)
            .proposedLatestRoundData();
        answer = (answer * 1e8) / GRAM_PER_TROYOUNCE;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

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

    function latestAnswer() external view returns (int256);

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

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

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

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

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_aggregator","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"GRAM_PER_TROYOUNCE","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VNXAU_AGGR_ADDR","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"roundId","type":"uint256"}],"name":"getAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"roundId","type":"uint80"}],"name":"proposedGetRoundData","outputs":[{"internalType":"uint80","name":"id","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proposedLatestRoundData","outputs":[{"internalType":"uint80","name":"id","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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