add solution of task node_form-data

db/expense.json

@@ -1,5 +1 @@
-{
-  "date": "2024-01-25",
-  "title": "Test Expense",
-  "amount": "100"
-}
+{}

src/createServer.js

@@ -1,8 +1,131 @@
 '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),
+        };
+
+        fs.readFile(filePath, 'utf-8', (err, data) => {
+          if (err) {
+            res.statusCode = 500;
+            res.end('Error reading file');
+
+            return null;
+          }
+
+          let expenseData;
+
+          try {
+            expenseData = JSON.parse(data);
+
+            if (!Array.isArray(expenseData.expenses)) {
+              expenseData.expenses = [];
+            }
+          } catch {
+            expenseData = { expenses: [] };
+          }
+
+          expenseData.expenses.push(newExpense);
+
+          fs.writeFile(
+            filePath,
+            JSON.stringify(expenseData, null, 2),
+            'utf-8',
+            (error) => {
+              if (error) {
+                res.statusCode = 500;
+                res.end('Failed to write file');
+
+                return null;
+              }
+
+              res.statusCode = 200;
+              res.setHeader('Content-Type', 'application/json');
+
+              res.end(
+                JSON.stringify(
+                  expenseData.expenses[expenseData.expenses.length - 1],
+                  null,
+                  2,
+                ),
+              );
+            },
+          );
+        });
+      });
+    } 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 = {