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supplyChainManagementContract.sol

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+//SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+contract SupplyChain{
+
+    // ################ GLOBAL VARIABLES ##################
+
+    address payable owner;
+    address[] listOfManufacturers;
+
+    // Struct for the details of the manufacturers
+    struct Manufacturers {
+        string name;
+        string description;
+        bool ethStakted;
+    }
+    Manufacturers public manufacturers;
+    mapping (address => Manufacturers) public detailsOfManufacturers;
+
+
+
+    // Struct for the details of the item/products
+    struct ITEM{
+        string name;
+        uint price;
+        string description;
+        address owner;
+        bytes32 unqProductID; 
+        address manufacturer;
+    }
+    ITEM public products;
+    mapping (uint => ITEM) public productDetails; // mapping to store product details with its id
+    uint public productID = 1;
+
+    mapping (bytes32 => address) public prevOwners; //It will store all the previous owver to a product and we can se using it's uniqProductID
+
+
+
+    // ################ CONSTRUCTOR ##################
+
+    constructor (){
+        owner = payable(msg.sender);
+    }
+
+
+    // ################ MODIFIERS ##################
+
+    modifier onlyOwner() {
+        require(msg.sender == owner, "ONLY OWNER CAN ACESS THIS FUNCTION");
+        _;
+    }
+
+    modifier onlyManufacturer(){
+        require(detailsOfManufacturers[msg.sender].ethStakted == true, "ONLY MANUFACTURER CAN ACESS THIS FUNCTION");
+        _;
+    }
+
+
+    // ################ FUNCTIONS ##################
+
+    // BECOME MANUFACTURER FUNCITON
+    function becomeManufacturer(string memory _name, string memory _description) public payable
+    {
+        require(msg.value == 10 ether,"Please Stake 10 Ether to become a manufacturer");
+        listOfManufacturers.push(msg.sender);
+        Manufacturers memory _manufacturer = Manufacturers(_name, _description, true); 
+        detailsOfManufacturers[msg.sender] = _manufacturer;
+    }
+
+    // ADD PRODUCT FUNCTION
+    function addProduct(string memory _name , uint _price, string memory _description)  public onlyManufacturer {
+        // sha256(abi.encodePacked(block.timestamp, _name, productID));
+
+        productDetails[productID] = ITEM(_name, _price, _description, address(0) ,  sha256(abi.encodePacked(block.timestamp, _name, productID)) , msg.sender);
+        productID++;
+
+    }
+
+    // BUY FUNCTION
+    function buyProduct(uint _id) public payable {
+        require (productDetails[_id].price == msg.value, "Please pay right amount");
+        address payable _manufacturer = payable(productDetails[_id].manufacturer);
+        _manufacturer.transfer(msg.value); // this will transfer the value of the product to its manufacturer 
+        productDetails[_id].owner = msg.sender; // this will set the new owner for the product
+        prevOwners[productDetails[_id].unqProductID] = msg.sender; // this will store the owners of that product 
+    }
+
+
+    // Owner get the money of maintaining and veryfying all the details of the manufacturers
+    function withdrawRevenue() public payable onlyOwner
+    {
+        uint totalRevenue = address(this).balance;
+        owner.transfer(totalRevenue);
+    }
+}