// File: @openzeppelin/contracts/GSN/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/tokens/AddressBook.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.7.0;

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

contract AddressBook is Ownable, IAddressBook {
  IAddressBook public defaultFactory;

  mapping(address => address) public entries;

  event EntrySet(address token, address wrapper);
  event DefaultFactorySet(address factory);

  constructor(IAddressBook _defaultFactory) public {
    defaultFactory = _defaultFactory;
    emit DefaultFactorySet(address(defaultFactory));

    // Needs to be explicitly set since we deploy through a Create2 proxy
    transferOwnership(tx.origin);
  }

  function calculateWrapperAddress(address token) external view override returns (address calculatedAddress) {
    if (entries[token] != address(0)) {
      return entries[token];
    }

    return defaultFactory.calculateWrapperAddress(token);
  }

  function getWrapperAddress(address token) external override returns (address wrapperAddress) {
    if (entries[token] != address(0)) {
      return entries[token];
    }

    return defaultFactory.getWrapperAddress(token);
  }

  function setEntry(address token, address wrapper) external onlyOwner {
    entries[token] = wrapper;
    emit EntrySet(token, wrapper);
  }

  function setDefaultFactory(address newFactory) external onlyOwner {
    defaultFactory = IAddressBook(newFactory);
    emit DefaultFactorySet(newFactory);
  }
}

// File: contracts/tokens/IAddressBook.sol



pragma solidity >=0.6.2 <0.7.0;

interface IAddressBook {
  function getWrapperAddress(address token) external returns (address wrapperAddress);

  function calculateWrapperAddress(address token) external view returns (address calculatedAddress);
}