// File: contracts/adapters/SimpleOracle.sol



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

import "./ProviderAwareOracle.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract SimpleOracle is ProviderAwareOracle {
    mapping(address => mapping(address => bool)) public tokenAdmins;

    mapping(address => uint256) private _currentPrices;

    event PriceUpdated(address indexed token, uint256 indexed price);
    event AdminStatusApproved(address indexed token, address indexed admin, bool indexed isApproved);

    modifier onlyAdmin(address token) {
        require(msg.sender == owner() || tokenAdmins[token][msg.sender], "Unauthorized!");
        _;
    }

    constructor(address _provider) ProviderAwareOracle(_provider) {}

    function getSafePrice(address token) external view returns (uint256 _amountOut) {
        return _currentPrices[token];
    }

    /// @dev This method has no guarantee on the safety of the price returned. It should only be
    //used if the price returned does not expose the caller contract to flashloan attacks.
    function getCurrentPrice(address token) external view returns (uint256 _amountOut) {
        return _currentPrices[token];
    }

    /// @dev This method returns a flashloan resistant price, but doesn't
    //have the view modifier which makes it convenient to update
    //a uniswap oracle which needs to maintain the TWAP regularly.
    //You can use this function while doing other state changing tx and
    //make the callers maintain the oracle.
    function updateSafePrice(address token) external view returns (uint256 _amountOut) {
        return _currentPrices[token];
    }

    function updatePrice(address token, uint256 price) external onlyAdmin(token) {
        _currentPrices[token] = price;
        emit PriceUpdated(token, price);
    }

    function setAdminStatus(address token, address admin, bool isApproved) external onlyOwner {
        tokenAdmins[token][admin] = isApproved;
        emit AdminStatusApproved(token, admin, isApproved);
    }
}

// File: contracts/adapters/ProviderAwareOracle.sol



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

import "../interfaces/IPriceOracle.sol";
import "../interfaces/IPriceProvider.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

abstract contract ProviderAwareOracle is IPriceOracle, Ownable {
    uint256 internal constant PRECISION = 1 ether;

    IPriceProvider public provider;

    event ProviderTransfer(address _newProvider, address _oldProvider);

    constructor(address _provider) Ownable(msg.sender) {
        provider = IPriceProvider(_provider);
    }

    function setPriceProvider(address _newProvider) external onlyOwner {
        address oldProvider = address(provider);
        provider = IPriceProvider(_newProvider);
        emit ProviderTransfer(_newProvider, oldProvider);
    }
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



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

pragma solidity ^0.8.19;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

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

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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: contracts/interfaces/IPriceOracle.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

/// @dev Oracles should always return un the price in FTM with 18 decimals
interface IPriceOracle {
    /// @dev This method returns a flashloan resistant price.
    function getSafePrice(address token) external view returns (uint256 _amountOut);

    /// @dev This method has no guarantee on the safety of the price returned. It should only be
    //used if the price returned does not expose the caller contract to flashloan attacks.
    function getCurrentPrice(address token) external view returns (uint256 _amountOut);

    /// @dev This method returns a flashloan resistant price, but doesn't
    //have the view modifier which makes it convenient to update
    //a uniswap oracle which needs to maintain the TWAP regularly.
    //You can use this function while doing other state changing tx and
    //make the callers maintain the oracle.
    function updateSafePrice(address token) external returns (uint256 _amountOut);
}

// File: contracts/interfaces/IPriceProvider.sol



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

interface IPriceProvider {
    event SetTokenOracle(address token, address oracle);

    function getSafePrice(address token) external view returns (uint256);

    function getCurrentPrice(address token) external view returns (uint256);

    function updateSafePrice(address token) external returns (uint256);

    /// Get value of an asset in units of quote
    function getValueOfAsset(address asset, address quote) external view returns (uint256 safePrice);

    function tokenHasOracle(address token) external view returns (bool hasOracle);

    function pairHasOracle(address token, address quote) external view returns (bool hasOracle);
}

// File: lib/openzeppelin-contracts/contracts/utils/Context.sol



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

pragma solidity ^0.8.19;

/**
 * @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;
    }
}