rental.sol

pragma solidity ^0.4.0;

contract Rental {
    uint deposit;
    uint rent;
    uint balance;
    
    address tenant;
    address landlord;
    
    event DepositPayed(address payer, address tenant);
    event DepositWithdrawn();
    event RentWithdrawn(uint amount);
    
    enum State {Vacant, Occupied}
    State state;
    
    // Constructor
    function Rental(uint _deposit, uint _rent) {
        landlord = msg.sender;
        deposit = _deposit;
        rent = _rent;
        state = State.Vacant;
    }
    
    function moveIn(address _tenant) payable {
        require(state == State.Vacant);
        
        // need to pay the deposit in full or the money will be sent back
        require(msg.value >= deposit);
        
        tenant = _tenant;
        DepositPayed(msg.sender, tenant);
        
        state = State.Occupied;
    }
    
    function moveOut() {
        require(state == State.Occupied);
        require(msg.sender == tenant);
        
        tenant.transfer(deposit); // error check needed?
        
        deposit = 0;
        tenant = 0; // not sure if this is good
        
        DepositWithdrawn();
        
        state = State.Vacant;
    }
    
    function payRent() payable {
        require(state == State.Occupied);
        balance += msg.value;
    }
    
    function withdrawRent() {
        require(msg.sender == landlord);
        require(balance > 0);
        
        RentWithdrawn(balance);
        landlord.transfer(deposit); // fails here
        
        balance = 0;
    }
    
    function getDeposit() returns (uint) {
        return deposit;
    }
    
    function getBalance() returns (uint) {
        return balance;
    }
}