EscrowContract

pragma solidity ^0.5.1;

// code version 2.1 1566934456

contract Escrow {
  address payable  renter;              // renter's address
  address payable  owner;               // owner's address
  uint  timeToExpiry;                   // time to expiry to be entered in seconds
  uint  startTime;
  uint  deposit;                        // initial value for contract
  uint  totaldep;                       // keep tracks of total deposit done to owner
  uint  digitalKey;                     // digital key value
  
  constructor(address payable _owner, uint _timeToExpiry, uint _digitalKey) public payable {
    renter = msg.sender;                // renter has value of the account which deployed the contract
    owner = _owner;
    digitalKey = _digitalKey;
    totaldep = 0;
    startTime = now;                    // unix epoch time at the time of deployment
    uint x = _timeToExpiry; 
    timeToExpiry = startTime + x;       // time (trial) expires after this time 
  }
  // fallback function allowing to transfer ether from contract to owner
  function payRent(uint _deposit) public payable {
    emit isReceived(owner, renter, digitalKey);
    deposit = _deposit;                 // value of each individual deposit done to owner
    totaldep += _deposit;               // total deposit done to owner
    
   if (msg.sender == renter && isExpired() == false) {
       owner.transfer(deposit);         // if trial is not expired yet we can deposit ether to owner as many times as we wish
       
   }
  }
  // fallback function to transfer ether from owner to renter account
  function moneyBack() public payable {
      emit isRefunded(owner, renter, digitalKey);
      owner = msg.sender ;              // select owner address as selected account 
      
      if (msg.sender == owner){
          renter.transfer(totaldep);    // transfer money from owner to renter
      }
  }

  function isExpired() public returns (bool) {
   if(now > timeToExpiry) {             // check is trail has expired
       moneyBack();
       cancelContract();
       return true;
       
   }
  }
  
  event isReceived(address _owner, address _renter, uint _digitalKey);
  event isRefunded(address _owner, address _renter, uint _digitalKey);
  
  function cancelContract() public  {       // function to cancel contract and refund amount given to owner 
                                            // and amount left in contract after deducting gas
      selfdestruct(renter);                 // refund unspent transaction from contract
  }
  
  function totalAmountReleased() public view returns(uint){     // check the current total deposit to owner
      return totaldep;
  }
}