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// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../../interfaces/external/aave/IAToken.sol";
import "../../interfaces/periphery/IOracle.sol";
import "../../interfaces/periphery/ITokenOracle.sol";

/**
 * @title Oracle for `ATokens`
 */
contract ATokenOracle is ITokenOracle {
    /// @inheritdoc ITokenOracle
    function getPriceInUsd(address _asset) external view returns (uint256 _priceInUsd) {
        // Note: `msg.sender` is the `MasterOracle` contract
        return IOracle(msg.sender).getPriceInUsd(IAToken(_asset).UNDERLYING_ASSET_ADDRESS());
    }
}

// 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);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

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

interface IAToken is IERC20 {
    function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

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

    /**
     * @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
     */
    function quote(
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    ) external view returns (uint256 _amountOut);

    /**
     * @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
     */
    function quoteTokenToUsd(address token_, uint256 amountIn_) external view returns (uint256 amountOut_);

    /**
     * @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
     */
    function quoteUsdToToken(address token_, uint256 amountIn_) external view returns (uint256 _amountOut);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface ITokenOracle {
    /**
     * @notice Get USD (or equivalent) price of an asset
     * @param token_ The address of asset
     * @return _priceInUsd The USD price
     */
    function getPriceInUsd(address token_) external view returns (uint256 _priceInUsd);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 5000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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