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SupplyChain.sol

+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract SupplyChain {
+    enum SupplyChainStatus { Created, InTransit, Delivered }
+
+    struct Item {
+        uint256 id;
+        string name;
+        uint256 quantity;
+        SupplyChainStatus status;
+    }
+
+    mapping(uint256 => Item) public items;
+    uint256 public itemCount;
+
+    event ItemCreated(uint256 indexed id, string name, uint256 quantity);
+    event ItemInTransit(uint256 indexed id);
+    event ItemDelivered(uint256 indexed id);
+
+    function createItem(string memory _name, uint256 _quantity) external {
+        itemCount++;
+        items[itemCount] = Item(itemCount, _name, _quantity, SupplyChainStatus.Created);
+        emit ItemCreated(itemCount, _name, _quantity);
+    }
+
+    function markItemInTransit(uint256 _id) external {
+        require(items[_id].status == SupplyChainStatus.Created, "Item is not in a created state");
+        items[_id].status = SupplyChainStatus.InTransit;
+        emit ItemInTransit(_id);
+    }
+
+    function markItemDelivered(uint256 _id) external {
+        require(items[_id].status == SupplyChainStatus.InTransit, "Item is not in transit");
+        items[_id].status = SupplyChainStatus.Delivered;
+        emit ItemDelivered(_id);
+    }
+}
+