Create ImpactInvestingContract.sol

contracts/ImpactInvestingContract.sol

@@ -0,0 +1,80 @@
+pragma solidity ^0.8 .0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
+
+contract ImpactInvestingContract {
+    // Mapping of project IDs to project details
+    mapping(uint => Project) public projects;
+
+    // Mapping of user addresses to their investments
+    mapping(address => mapping(uint => Investment)) public investments;
+
+    // Event emitted when a new project is added
+    event ProjectAdded(uint projectId, string projectName, string projectDescription);
+
+    // Event emitted when a user invests in a project
+    event InvestmentMade(address indexed user, uint projectId, uint amount);
+
+    // Struct to represent a project
+    struct Project {
+        uint id;
+        string name;
+        string description;
+        uint goal;
+        uint raised;
+    }
+
+    // Struct to represent an investment
+    struct Investment {
+        uint projectId;
+        uint amount;
+    }
+
+    // Function to add a new project
+    function addProject(string memory _name, string memory _description, uint _goal) public {
+        // Generate a unique project ID
+        uint projectId = uint(keccak256(abi.encodePacked(_name, _description, _goal)));
+
+        // Create a new project
+        projects[projectId] = Project(projectId, _name, _description, _goal, 0);
+
+        // Emit the ProjectAdded event
+        emit ProjectAdded(projectId, _name, _description);
+    }
+
+    // Function to invest in a project
+    function invest(uint _projectId, uint _amount) public {
+        // Check if the project exists
+        require(projects[_projectId].id != 0, "Project does not exist");
+
+        // Check if the user has already invested in the project
+        require(investments[msg.sender][_projectId].amount == 0, "User has already invested in this project");
+
+        // Update the project's raised amount
+        projects[_projectId].raised += _amount;
+
+        // Create a new investment
+        investments[msg.sender][_projectId] = Investment(_projectId, _amount);
+
+        // Emit the InvestmentMade event
+        emit InvestmentMade(msg.sender, _projectId, _amount);
+    }
+
+    // Function to get a project's details
+    function getProject(uint _projectId) public view returns (Project memory) {
+        return projects[_projectId];
+    }
+
+    // Function to get a user's investments
+    function getInvestments(address _user) public view returns (Investment[] memory) {
+        Investment[] memory userInvestments = new Investment[](projects.length);
+
+        for (uint i = 0; i < projects.length; i++) {
+            if (investments[_user][i].amount != 0) {
+                userInvestments.push(investments[_user][i]);
+            }
+        }
+
+        return userInvestments;
+    }
+}