hospital

pragma solidity ^0.4.0;
pragma experimental ABIEncoderV2;
contract Hospital {
    
    string name;
    Receipt[] public receipts;

    

    constructor (string _name) public payable{
        name = _name;
    }
    
    function add(Receipt newReceipt) public {
        receipts.push(newReceipt);
    }
    
    function verify (Receipt verifyingReceipt) public returns (bool) {
        for (uint256 i = 0; i < receipts.length; i++) {
            if (receipts[i] == verifyingReceipt) {
                return true;
            }
        }
        return false;
    }
}

contract Receipt {

    string examination;
    string treatment;
    uint256 cost;
    int id;
    
    address patient;

    constructor(uint256 _cost, string _examination, string _treatment, address _patient) public payable {
        cost = _cost;
        examination = _examination;
        treatment = _treatment;
        id = 1;
        patient = _patient;
    }
    
    function getPatientAddress() public returns (address) {
        return patient;
    }
    
    function getCost() public returns (uint256) {
        return cost;
    }
}

contract Claim {
    Receipt receipt;
    string status;
    
    constructor(Receipt patientReceipt, string _status) public payable{
        receipt = patientReceipt;
        status = _status;
    }
    
    function updateStatus(string _status) public {
        status = _status;
    }
    
    function getReceipt() public returns(Receipt) {
        return receipt;
    }
    
    function getStatus() public returns(string) {
        return status;
    }
}

contract Patient {
    string name;
    
    //InsuranceCompany insuranceCompany;
    constructor(string _name) public payable{
        name = _name;
    }
    
    function requestReceipt(Receipt _receipt, InsuranceCompany insuranceCompany) public {
        // submit claim
        insuranceCompany.submit(_receipt);
    }
    
}

contract InsuranceCompany {
    string name;
    Claim[] public claims;
    
    
    constructor(string _name) public payable {
        name = _name;
    }
    
    function submit(Receipt _receipt) public {
        Claim claim = new Claim(_receipt, "pending");
        claims.push(claim);
    }
    
    function loadAllPendingClaims() public returns(Claim[] claims) {
        Claim[] result;
        for (uint256 i = 0; i < claims.length; i++) {
            if (keccak256(claims[i].getStatus()) == keccak256("pending")) {
                result.push(claims[i]);
            }
        }
        return (result);
    }

    function verify(Hospital hospital, Receipt receipt) public payable returns (bool){
        Claim newClaim = new Claim(receipt, "pending");
        if(hospital.verify(newClaim.getReceipt()) == true) {
            newClaim.updateStatus("Approved");
            receipt.getPatientAddress().transfer(receipt.getCost());
            return true;
        } else {
            newClaim.updateStatus("Reject");
            return false;
        }
    }

}