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contracts...Learning...HealthCareSupplyChain.sol

//SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract HealthSupplyChain{

    address public manufacturer;
    address public distributor;
    address public recipient;
    uint public shipmentDate;
    uint public deliveryDate;
    uint public quantity;
    bool public delivered;

    event ShipmentCreated(address indexed manufacturer,address indexed distributor,uint indexed shipmentDate,uint quantity);
    event ShipmentDelivered(address indexed distributor,address indexed recipient,uint indexed deliveryDate,uint quantity,bool isDelivered);
    constructor(){
        manufacturer = msg.sender;
    }

    modifier onlyManufacturer(){
        require(msg.sender == manufacturer,"Only Manufacturer create the shipment");
        _;
    }
    modifier onlyDistributor(){
        require(msg.sender== distributor,"Only Distributor create delivery of shipment");
        _;
    }

    function createShipment(address _distributor,uint _shipmentDate,uint _quantity) public onlyManufacturer{
        distributor = _distributor;
        shipmentDate = _shipmentDate;
        quantity = _quantity;

        emit ShipmentCreated(manufacturer,distributor,shipmentDate,quantity);
    }

    function deliverShipment(address _recipient,uint _deliveryDate,uint _quantity) public onlyDistributor{
        require(shipmentDate>0,"Shipment has not created yet!");
        recipient = _recipient;
        deliveryDate = _deliveryDate;
        quantity = _quantity;
        delivered = true;
        emit ShipmentDelivered(distributor,recipient,deliveryDate,quantity,delivered);
    }


}