// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/ERC1967/ERC1967Proxy.sol)

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pragma solidity 0.8.20;

import { Proxy } from "@openzeppelin/contracts/proxy/Proxy.sol";
import { ERC1967Utils } from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol";

/**
 * Forked from OZ.
 *
 * @dev This contract implements an upgradeable proxy.
 * It is upgradeable because calls are delegated to an implementation address that can be changed. This address is stored in storage
 * in the location specified by https://eips.ethereum.org/EIPS/eip-1967[EIP1967],
 * so that it doesn't conflict with the storage layout of the implementation behind the proxy.
 */
// https://stackoverflow.com/a/61678986/7302689
// solc-ignore-next-line missing-receive
contract B3TRProxy is Proxy {
  /**
   * @dev Initializes the upgradeable proxy with an initial implementation specified by `implementation`.
   *
   * If `_data` is nonempty, it's used as data in a delegate call to `implementation`. This will typically be an
   * encoded function call, and allows initializing the storage of the proxy like a Solidity constructor.
   *
   * Requirements:
   *
   * - If `_data` is empty, `msg.value` must be zero.
   */
  constructor(address implementation, bytes memory _data) payable {
    ERC1967Utils.upgradeToAndCall(implementation, _data);
  }

  /**
   * @dev Returns the current implementation address.
   *
   * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using
   * the https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
   * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
   */
  function _implementation() internal view virtual override returns (address) {
    return ERC1967Utils.getImplementation();
  }
}