From 78b04811b9edbd79f566218bf03729426ef040c0 Mon Sep 17 00:00:00 2001
From: tylen <tylen@vm-personal.com>
Date: Thu, 25 Sep 2025 01:13:11 +0300
Subject: [PATCH] backend: add users CRUD

---
 backend/src/server.py |   2 +
 backend/src/user.py   | 111 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 backend/src/user.py

diff --git a/backend/src/server.py b/backend/src/server.py
index 905022f..e920d45 100644
--- a/backend/src/server.py
+++ b/backend/src/server.py
@@ -9,11 +9,13 @@ from flask import Flask, request, jsonify
 from dotenv import load_dotenv
 from db_client import DBClient
 from car import registerCarEndpoints
+from user import registerUserEndpoints
 
 load_dotenv()
 app = Flask(__name__)
 database = DBClient()
 registerCarEndpoints(app=app, database=database)
+registerUserEndpoints(app=app, database=database)
 
 @app.route('/login', methods=['POST'])
 def login():
diff --git a/backend/src/user.py b/backend/src/user.py
new file mode 100644
index 0000000..167250d
--- /dev/null
+++ b/backend/src/user.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+'''
+user.py is a source for all user endpoints.
+'''
+
+from flask import request, jsonify
+
+def registerUserEndpoints(app, database):
+  @app.route('/users', methods=['GET'])
+  def get_users():
+      query = f'SELECT * from users'
+      users = database.query(query_str=query)
+      if not users:
+          return jsonify({"message": "No users exist"}), 404
+      response = {}
+      for user in users: 
+        if len(user) != 3:
+            return jsonify({'error': 'User data is corrupted'}), 500
+
+        response.update({
+          "name": user[0],
+          "attendance": user[1],
+          "has_car": bool(user[2])
+        })
+      return jsonify(response), 200 
+
+  @app.route('/user', methods=['GET'])
+  def get_user():
+      if not request.is_json:
+          return jsonify({'error': 'Request must contain JSON data'}), 400
+
+      data = request.get_json()
+
+      if not data.get('name'):
+          return jsonify({'error': 'Request must contain name field'}), 400
+      
+      query = f'SELECT * from users WHERE name = %s'
+      output = database.query(query_str=query, params=(data['name'],))
+      if not output:
+          return jsonify({"message": "No user by that name exist"}), 404
+      user = output[0]
+      if len(user) != 3:
+          return jsonify({'error': 'User data is corrupted'}), 500
+
+      response = {
+          "name": user[0],
+          "attendance": user[1],
+          "has_car": bool(user[2]) 
+      }
+      return jsonify(response), 200
+      
+  @app.route('/user', methods=['POST'])
+  def add_user():
+      if not request.is_json:
+          return jsonify({'error': 'Request must contain JSON data'}), 400
+
+      data = request.get_json()
+      if not data.get('name') or not data.get('attendance') or data.get('has_car') is None:
+          return jsonify({'error': 'JSON must contain user fields'}), 400
+      
+      query = 'SELECT * from users WHERE name = %s'
+      output = database.query(query_str=query, params=(data['name'],)) 
+      if output:
+          return jsonify({'error': 'A person already exists'}), 409
+      
+      query = 'INSERT into users (Name, Attendance, HasCar) VALUES (%s, %s, %s)'
+      output = database.query(query_str=query, params=(data['name'],data['attendance'],data['has_car']))
+
+      database.commit()
+      return jsonify({"message": "user added", "user": data}), 200
+      
+  @app.route('/user', methods=['UPDATE'])
+  def update_user():
+      if not request.is_json:
+          return jsonify({'error': 'Request must contain JSON data'}), 400
+
+      data = request.get_json()
+      if not data.get('name') or not data.get('attendance') or data.get('has_car') is None:
+          return jsonify({'error': 'JSON must contain user fields'}), 400
+      
+      query = 'SELECT * from users WHERE name = %s'
+      output = database.query(query_str=query, params=(data['name'],)) 
+      if not output:
+          return jsonify({'error': 'Such user does not exist. Add it first'}), 409
+      
+      query = 'UPDATE user SET Name = %s, Attendance = %s, HasCar = %s'
+      output = database.query(query_str=query, params=(data['name'],data['attendance'],data['has_car']))
+
+      database.commit()
+      return jsonify({"message": "user modified", "user": data}), 200
+
+  @app.route('/user', methods=['DELETE'])
+  def delete_user():
+      if not request.is_json:
+          return jsonify({'error': 'Request must contain JSON data'}), 400
+
+      data = request.get_json()
+      if not data.get('name'):
+          return jsonify({'error': 'JSON must contain persons name to delete'}), 400
+
+      query = 'SELECT * from users WHERE name = %s'
+      output = database.query(query_str=query, params=(data['name'],)) 
+      if not output:
+          return jsonify({'error': 'Such person does not exist'}), 409
+      
+      query = 'DELETE FROM users WHERE Name = %s'
+      output = database.query(query_str=query, params=(data['name'],))
+      database.commit()
+      return jsonify({"message": "user deleted"}), 200 
\ No newline at end of file