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//Write your own contracts here. Currently compiles using solc v0.4.15+commit.bbb8e64f.
pragma solidity ^0.4.18;
contract SimpleStore {
  function set(uint _value) public {
    value = _value;
  }

function get() public constant returns (uint) {
    return value;
  }

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

contract SimpleEscrow {
    address public escrowAgent; // Treuhänder
    address payable public seller;
    address payable public buyer;

enum State { AWAITING_PAYMENT, AWAITING_DELIVERY, COMPLETE, REFUNDED }
    State public currentState;

constructor(address payable _seller, address payable _buyer) {
        escrowAgent = msg.sender;
        seller = _seller;
        buyer = _buyer;
        currentState = State.AWAITING_PAYMENT;
    }

// Einzahlung durch den Käufer
    function deposit() external payable {
        require(msg.sender == buyer, "Nur der Käufer kann einzahlen");
        require(currentState == State.AWAITING_PAYMENT, "Zahlung nicht erwartet");
        require(msg.value > 0, "Der Betrag muss größer als 0 sein");
        currentState = State.AWAITING_DELIVERY;
    }

// Bestätigung durch den Käufer
    function confirmDelivery() external {
        require(msg.sender == buyer, "Nur der Käufer kann die Lieferung bestätigen");
        require(currentState == State.AWAITING_DELIVERY, "Keine Lieferung erwartet");
        currentState = State.COMPLETE;
        seller.transfer(address(this).balance);
    }

// Rückerstattung an den Käufer durch den Treuhänder
    function refundBuyer() external {
        require(msg.sender == escrowAgent, "Nur der Treuhänder kann zurückerstatten");
        require(currentState == State.AWAITING_DELIVERY, "Rückerstattung nicht möglich");
        currentState = State.REFUNDED;
        buyer.transfer(address(this).balance);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract SimpleEscrow {
    address public escrowAgent; // Treuhänder
    address public seller;
    address public buyer;

enum State { AWAITING_PAYMENT, AWAITING_DELIVERY, COMPLETE, REFUNDED }
    State public currentState;

constructor(address _seller, address _buyer) {
        escrowAgent = msg.sender;
        seller = _seller;
        buyer = _buyer;
        currentState = State.AWAITING_PAYMENT;
    }