application manager

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
 	"[typescript]": {
 		"editor.defaultFormatter": "biomejs.biome"
-	}
+	},
+	"solidity.compileUsingRemoteVersion": "v0.8.26+commit.8a97fa7a"
 }

contracts/ApplicationManager.sol

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity 0.8.26;
+
+import {IApplicationManager} from "./IApplicationManager.sol";
+
+contract ApplicationManager is IApplicationManager {
+    mapping(uint => Application) private applications;
+    mapping(address => bool) private addressUsed;
+    uint private nextApplicationId;
+
+    constructor() {}
+
+    function applicationExists(uint id) internal view returns (bool) {
+        return applications[id].account != address(0);
+    }
+    function getNextApplicationId() external view  returns (uint) {
+        return nextApplicationId;
+    }
+
+    function createApplication(Application memory application) external  {
+        require(!addressUsed[application.account], "Address already used for another application");
+        applications[nextApplicationId] = application;
+        addressUsed[application.account] = true;
+        emit ApplicationCreated(nextApplicationId, applications[nextApplicationId]);
+        nextApplicationId++;
+    }
+
+    function updateApplication(uint id, Application memory application) external  {
+        require(applicationExists(id), "Application does not exist");
+        require(!addressUsed[application.account] || applications[id].account == application.account,
+            "Address already used for another application");
+        applications[id] = application;
+        emit ApplicationUpdated(id, applications[id]);
+    }
+
+    function deleteApplication(uint id) external  {
+        require(applicationExists(id), "Application does not exist");
+        addressUsed[applications[id].account] = false;
+        emit ApplicationDeleted(id, applications[id]);
+        delete applications[id];
+    }
+
+    function getApplication(uint id) external view  returns (Application memory) {
+        require(applicationExists(id), "Application does not exist");
+        return applications[id];
+    }
+
+    function getApplications(uint start, uint limit) external view returns (Application[] memory) {
+        Application[] memory result = new Application[](limit);
+        uint count = 0;
+        uint index = start;
+        while (count < limit && index < nextApplicationId) {
+            if (applicationExists(index)) {
+                result[count] = applications[index];
+                count++;
+            }
+            index++;
+        }
+
+        assembly { mstore(result, count) }
+
+        return result;
+    }
+}

contracts/IApplicationManager.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity 0.8.26;
+
+interface IApplicationManager {
+    struct Application {
+        string name;
+        address account;
+    }
+
+    event ApplicationCreated(uint id, Application application);
+    event ApplicationUpdated(uint id, Application application);
+    event ApplicationDeleted(uint id, Application application);
+
+    function getNextApplicationId() external view returns (uint);
+    function createApplication(Application memory application) external;
+    function updateApplication(uint id, Application memory application) external;
+    function deleteApplication(uint id) external;
+    function getApplication(uint id) external view returns (Application memory);
+    function getApplications(uint start, uint limit) external returns (Application[] memory);
+}

hardhat.config.ts

@@ -3,7 +3,7 @@ import "@nomicfoundation/hardhat-toolbox-viem";
 import "@nomiclabs/hardhat-solhint";
 
 const config: HardhatUserConfig = {
-	solidity: "0.8.24",
+	solidity: "0.8.26",
 };
 
 export default config;