SupplyChain.sol

pragma solidity ^0.8.0;

contract SupplyChain {

enum ProductStatus { Created, Shipped, Delivered }

struct Product {

uint256 id;

string name;

uint256 price;

address seller;

address buyer;

ProductStatus status;

}

uint256 public productCount;

mapping(uint256 => Product) public products;

event ProductCreated(uint256 id, string name, uint256 price, address seller);

event ProductShip(uint256 id);

event ProductDelivered(uint256 id);

function createProduct(string memory _name, uint256 _price) public {

productCount++;

products[productCount] = Product(productCount, _name, _price, msg.sender, address(0), ProductStatus.Created);

emit ProductCreated(productCount, _name, _price, msg.sender);

}

function shipProduct(uint256 _id) public {

Product storage product = products[_id];

require(product.status == ProductStatus.Created, "Product is not in the Created status");

require(product.seller == msg.sender, "Only the seller can ship the product");

product.status = ProductStatus.Ship;

emit ProductShip(_id);

}

function deliverProduct(uint256 _id) public {

Product storage product = products[_id];

require(product.status == ProductStatus.Shipped, "Product is not in the Shipped status");

require(product.buyer == msg.sender, "Only the buyer can deliver the product");

product.status = ProductStatus.Delivered;

emit ProductDelivered(_id);

}

}