add task solution

src/createServer.js

@@ -1,3 +1,75 @@
-// Write code here
-// Also, you can create additional files in the src folder
-// and import (require) them here
+const { createServer: createHttpServer } = require('http');
+const { URL: URLConstructor } = require('url');
+const { convertToCase } = require('./convertToCase');
+
+const SUPPORTED_CASES = ['SNAKE', 'KEBAB', 'CAMEL', 'PASCAL', 'UPPER'];
+
+function createServer() {
+  return createHttpServer((req, res) => {
+    // Set Content-Type header for all responses
+    res.setHeader('Content-Type', 'application/json');
+
+    // Parse the URL
+    const parsedUrl = new URLConstructor(req.url, 'http://localhost');
+    const pathname = parsedUrl.pathname;
+    const searchParams = parsedUrl.searchParams;
+
+    // Extract text from pathname (remove leading /)
+    const text = pathname.slice(1);
+
+    // Extract toCase from query params
+    const toCase = searchParams.get('toCase');
+
+    // Validate
+    const errors = [];
+
+    if (!text) {
+      errors.push({
+        message:
+          'Text to convert is required. Correct request is: ' +
+          '"/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".',
+      });
+    }
+
+    if (!toCase) {
+      errors.push({
+        message:
+          '"toCase" query param is required. Correct request is: ' +
+          '"/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".',
+      });
+    } else if (!SUPPORTED_CASES.includes(toCase)) {
+      errors.push({
+        message:
+          'This case is not supported. Available cases: ' +
+          'SNAKE, KEBAB, CAMEL, PASCAL, UPPER.',
+      });
+    }
+
+    // If there are validation errors, respond with 400
+    if (errors.length > 0) {
+      res.writeHead(400, 'Bad request');
+      res.end(JSON.stringify({ errors }));
+
+      return;
+    }
+
+    // Call business logic
+    const result = convertToCase(text, toCase);
+
+    // Respond with success
+    res.writeHead(200, 'OK');
+
+    res.end(
+      JSON.stringify({
+        originalCase: result.originalCase,
+        targetCase: toCase,
+        originalText: text,
+        convertedText: result.convertedText,
+      }),
+    );
+  });
+}
+
+module.exports = {
+  createServer,
+};