add solution of task node_form-data

src/createServer.js

@@ -1,8 +1,128 @@
 'use strict';
 
+const http = require('node:http');
+const fs = require('node:fs');
+const path = require('node:path');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = new http.Server();
+  const filePath = path.join(__dirname, '..', 'db', 'expense.json');
+
+  server.on('request', (req, res) => {
+    if (req.method === 'POST' && req.url === '/submit-expense') {
+      if (!fs.existsSync(path.dirname(filePath))) {
+        fs.mkdirSync(path.dirname(filePath), { recursive: true });
+      }
+
+      if (!fs.existsSync(filePath)) {
+        fs.writeFileSync(
+          filePath,
+          JSON.stringify({ expenses: [] }, null, 2),
+          'utf-8',
+        );
+      }
+
+      let fields = '';
+
+      req.on('data', (chunk) => {
+        fields += chunk.toString();
+      });
+
+      req.on('end', () => {
+        const params = new URLSearchParams(fields);
+        const date = params.get('date');
+        const title = params.get('title');
+        const amount = params.get('amount');
+
+        if (!date || !title || !amount) {
+          res.statusCode = 400;
+          res.end('Missing fields');
+
+          return null;
+        }
+
+        const newExpense = {
+          date,
+          title,
+          amount: parseFloat(amount),
+        };
+
+        const jsonString = JSON.stringify(newExpense, null, 2);
+
+        const writeStream = fs.createWriteStream(filePath);
+
+        writeStream.on('error', (err) => {
+          // eslint-disable-next-line no-console
+          console.error('Write error:', err.message);
+        });
+
+        writeStream.on('finish', () => {
+          // eslint-disable-next-line no-console
+          console.log('Expense data written successfully.');
+        });
+
+        writeStream.write(jsonString);
+        writeStream.end();
+
+        let buffer = '';
+
+        const readStream = fs.createReadStream(filePath, { encoding: 'utf-8' });
+
+        readStream.on('data', (chunk) => {
+          buffer += chunk;
+        });
+
+        readStream.on('end', () => {
+          try {
+            res.statusCode = 200;
+            res.setHeader('Content-Type', 'text/html');
+
+            const data = JSON.parse(buffer);
+            const formattedJSON = JSON.stringify(data);
+
+            res.end(formattedJSON);
+          } catch (err) {
+            // eslint-disable-next-line no-console
+            console.error('JSON parse error:', err.message);
+          }
+        });
+
+        readStream.on('error', (err) => {
+          // eslint-disable-next-line no-console
+          console.error('Read error:', err.message);
+        });
+      });
+    } else if (req.url === '/') {
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/html');
+
+      res.end(`
+        <h2>Add Expense</h2>
+        <form method="POST" action="/submit-expense" enctype="application/x-www-form-urlencoded">
+          <label for="date">Date:</label><br />
+          <input type="date" name="date" id="date" /><br /><br />
+
+          <label for="title">Title:</label><br />
+          <input type="text" name="title" id="title" /><br /><br />
+
+          <label for="amount">Amount:</label><br />
+          <input type="number" name="amount" id="amount" /><br /><br />
+
+          <button type="submit">Post</button>
+        </form>
+      `);
+    } else {
+      res.statusCode = 404;
+      res.end('Not found');
+    }
+  });
+
+  server.on('error', (err) => {
+    // eslint-disable-next-line no-console
+    console.error('Server error:', err);
+  });
+
+  return server;
 }
 
 module.exports = {