update

app.js

@@ -1,25 +1,29 @@
-const express = require('express')
-const logger = require('morgan')
-const cors = require('cors')
+const express = require("express");
+const logger = require("morgan");
+const cors = require("cors");
+const contactsRouter = require("./routes/api/contacts");
 
-const contactsRouter = require('./routes/api/contacts')
+const app = express();
 
-const app = express()
+const formatsLogger = app.get("env") === "development" ? "dev" : "short";
 
-const formatsLogger = app.get('env') === 'development' ? 'dev' : 'short'
+app.use(logger(formatsLogger));
+app.use(cors());
+app.use(express.json());
 
-app.use(logger(formatsLogger))
-app.use(cors())
-app.use(express.json())
-
-app.use('/api/contacts', contactsRouter)
+app.use("/api/contacts", contactsRouter);
 
 app.use((req, res) => {
-  res.status(404).json({ message: 'Not found' })
-})
+  res.status(404).json({ message: "Not found" });
+});
 
 app.use((err, req, res, next) => {
-  res.status(500).json({ message: err.message })
-})
+  res.status(500).json({ message: err.message });
+});
+
+const PORT = process.env.PORT || 4000;
+app.listen(PORT, () => {
+  console.log(`Server running. Use our API on http://localhost:${PORT}`);
+});
 
-module.exports = app
+module.exports = app;

models/contacts.js

@@ -1,19 +1,80 @@
-// const fs = require('fs/promises')
+const fs = require("fs/promises");
+const path = require("path");
 
-const listContacts = async () => {}
+const contactsPath = path.join(__dirname, "contacts.json");
 
-const getContactById = async (contactId) => {}
+const listContacts = async () => {
+  try {
+    const data = await fs.readFile(contactsPath, "utf8");
+    return JSON.parse(data);
+  } catch (error) {
+    console.error("Error reading contacts:", error);
+    return [];
+  }
+};
 
-const removeContact = async (contactId) => {}
+const getContactById = async (contactId) => {
+  try {
+    const contacts = await listContacts();
+    const contact = contacts.find((c) => c.id === contactId);
+    return contact || null;
+  } catch (error) {
+    console.error("Error finding contact by ID:", error);
+    return null;
+  }
+};
 
-const addContact = async (body) => {}
+const removeContact = async (contactId) => {
+  try {
+    const contacts = await listContacts();
+    const filteredContacts = contacts.filter((c) => c.id !== contactId);
+    if (contacts.length === filteredContacts.length) {
+      return null;
+    }
+    await fs.writeFile(contactsPath, JSON.stringify(filteredContacts, null, 2));
+    return contactId;
+  } catch (error) {
+    console.error("Error removing contact:", error);
+    return null;
+  }
+};
 
-const updateContact = async (contactId, body) => {}
+const addContact = async (body) => {
+  try {
+    const contacts = await listContacts();
+    const newContact = {
+      id: String(Date.now()),
+      ...body,
+    };
+    contacts.push(newContact);
+    await fs.writeFile(contactsPath, JSON.stringify(contacts, null, 2));
+    return newContact;
+  } catch (error) {
+    console.error("Error adding contact:", error);
+    return null;
+  }
+};
+
+const updateContact = async (contactId, body) => {
+  try {
+    const contacts = await listContacts();
+    const index = contacts.findIndex((c) => c.id === contactId);
+    if (index === -1) {
+      return null;
+    }
+    contacts[index] = { ...contacts[index], ...body };
+    await fs.writeFile(contactsPath, JSON.stringify(contacts, null, 2));
+    return contacts[index];
+  } catch (error) {
+    console.error("Error updating contact:", error);
+    return null;
+  }
+};
 
 module.exports = {
   listContacts,
   getContactById,
   removeContact,
   addContact,
   updateContact,
-}
+};