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// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

import "./ReentrancyGuard.sol";
import "./TokenSaleDistributorProxyStorage.sol";

contract TokenSaleDistributorProxy is ReentrancyGuard, TokenSaleDistributorProxyStorage {
    /** The admin was changed  */
    event AdminChanged(address newAdmin);

    /** The implementation was changed */
    event ImplChanged(address newImpl);

    constructor() public {
        admin = msg.sender;
    }

    /**
     * Request a new admin to be set for the contract.
     *
     * @param newAdmin New admin address
     */
    function setPendingAdmin(address newAdmin) public adminOnly {
        require(newAdmin != address(0), "Cannot set to zero address");
        pendingAdmin = newAdmin;
    }

    /**
     * Accept admin transfer from the current admin to the new.
     */
    function acceptPendingAdmin() public {
        require(msg.sender == pendingAdmin && pendingAdmin != address(0), "Caller must be the pending admin");

        admin = pendingAdmin;
        pendingAdmin = address(0);

        emit AdminChanged(admin);
    }

    /**
     * Request a new implementation to be set for the contract.
     *
     * @param newImplementation New contract implementation contract address
     */
    function setPendingImplementation(address newImplementation) public adminOnly {
        require(newImplementation != address(0), "Cannot set to zero address");
        pendingImplementation = newImplementation;
    }

    /**
     * Accept pending implementation change
     */
    function acceptPendingImplementation() public {
        require(msg.sender == pendingImplementation && pendingImplementation != address(0), "Only the pending implementation contract can call this");

        implementation = pendingImplementation;
        pendingImplementation = address(0);

        emit ImplChanged(implementation);
    }

    fallback() payable external {
        (bool success, ) = implementation.delegatecall(msg.data);

        assembly {
            let free_mem_ptr := mload(0x40)
            let size := returndatasize()
            returndatacopy(free_mem_ptr, 0, size)

            switch success
            case 0 { revert(free_mem_ptr, size) }
            default { return(free_mem_ptr, size) }
        }
    }

    /********************************************************
     *                                                      *
     *                      MODIFIERS                       *
     *                                                      *
     ********************************************************/

    modifier adminOnly {
        require(msg.sender == admin, "admin only");
        _;
    }
}

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

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() public {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

contract TokenSaleDistributorProxyStorage {
    // Current contract admin address
    address public admin;

    // Requested new admin for the contract
    address public pendingAdmin;

    // Current contract implementation address
    address public implementation;

    // Requested new contract implementation address
    address public pendingImplementation;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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