Create BlockchainBasicsContract.sol

contracts/BlockchainBasicsContract.sol

@@ -0,0 +1,61 @@
+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
+
+contract BlockchainBasicsContract {
+   // Mapping of user addresses to their progress
+   mapping(address => uint) public progress;
+
+   // Event emitted when a user completes a lesson
+   event LessonCompleted(address indexed user, uint lessonId);
+
+   // Event emitted when a user earns a badge
+   event BadgeEarned(address indexed user, uint badgeId);
+
+   // Struct to represent a lesson
+   struct Lesson {
+       uint id;
+       string title;
+       string description;
+       uint reward;
+   }
+
+   // Struct to represent a badge
+   struct Badge {
+       uint id;
+       string title;
+       string description;
+       uint requirement;
+   }
+
+   // Array of lessons
+   Lesson[] public lessons;
+
+   // Array of badges
+   Badge[] public badges;
+
+   // Function to complete a lesson
+   function completeLesson(uint _lessonId) public {
+       // Check if the user has already completed the lesson
+       require(progress[msg.sender] < _lessonId, "Lesson already completed");
+
+       // Update the user's progress
+       progress[msg.sender] = _lessonId;
+
+       // Emit the LessonCompleted event
+       emit LessonCompleted(msg.sender, _lessonId);
+
+       // Check if the user has earned a badge
+       for (uint i = 0; i < badges.length; i++) {
+           if (badges[i].requirement <= _lessonId) {
+               // Emit the BadgeEarned event
+               emit BadgeEarned(msg.sender, badges[i].id);
+           }
+       }
+   }
+
+   // Function to get a user's progress
+   function getProgress(address _user) public view returns (uint) {
+       return progress[_user];
+   }
+}