📈 Price Comparator Java Backend App

A backend application for comparing product prices across multiple stores.
Built with Java, Spring Boot, and Gradle, this project processes CSV product data and provides endpoints for alerts, baskets, discounts, and product information.

🛠 Tools & Technologies

IDE: IntelliJ IDEA
Language: Java (OpenJDK 17.0.15)
Build Tool: Gradle (Kotlin DSL)
Framework: Spring Boot
CSV Handling: BufferedReader (no external libraries)
Frontend: HTML, JavaScript

📁 Project Structure

src/
 ├── main/
 │  ├── java/
 │  │  └── org.App/
 │  │    ├── Controllers/
 │  │    │  ├── AlertsController
 │  │    │  ├── BasketController
 │  │    │  ├── DiscountsController
 │  │    │  ├── HomeController
 │  │    │  └── ProductsController
 │  │    ├── Loaders/
 │  │    │  ├── DiscountsLoader
 │  │    │  └── ProductsLoader
 │  │    ├── Models/
 │  │    │  ├── Alerts
 │  │    │  ├── Discounts
 │  │    │  └── Products
 │  │    ├── Service/
 │  │    │  ├── AlertsService
 │  │    │  ├── DiscountsService
 │  │    │  └── ProductsService
 │  │    └── Main
 │  └── resources/
 │    ├── data/
 │    │  ├── kaufland_2025-05-01.csv
 │    │  ├── kaufland_2025-05-08.csv
 │    │  ├── kaufland_discounts_2025-05-01.csv
 │    │  ├── kaufland_discounts_2025-05-08.csv
 │    │  ├── lidl_2025-05-01.csv
 │    │  ├── lidl_2025-05-08.csv
 │    │  ├── lidl_discounts_2025-05-01.csv
 │    │  ├── lidl_discounts_2025-05-08.csv
 │    │  ├── mega_2025-05-20.csv
 │    │  ├── mega_2025-05-23.csv
 │    │  ├── mega_discounts_2025-05-20.csv
 │    │  ├── mega_discounts_2025-05-23.csv
 │    │  ├── profi_2025-05-01.csv
 │    │  ├── profi_2025-05-08.csv
 │    │  ├── profi_discounts_2025-05-01.csv
 │    │  └── profi_discounts_2025-05-08.csv
 │    └── static/
 │      ├── add-alert.html
 │      ├── basket.html
 │      └── delete-alert.html
 └────/

🚀 Getting Started

1. Download the project
   Go to the master branch → click Code → Download ZIP
2. Open in IntelliJ
   Unzip the project
   Right-click the folder → Open Folder as IntelliJ IDEA Project
   Click Trust Project if prompted
3. Set JDK
   Click SetupSDK in the top-right yellow ribbon
   Select ms-17 (OpenJDK 17.0.15)
4. Load Gradle
   Click Load in the bottom-right corner to load Gradle build files
5. Run the Application
   Navigate to src/main/java/org.App/Main
   Click the green Run arrow
6. Access the Backend
   Open your browser at: http://localhost:8080/home
   Example endpoints: /products/store/{storeName} → storeName: lidl | kaufland | profi | mega/products/category/{categoryName}
   Replace {storeName} or {categoryName} with your desired value

📌 Assumptions

IntelliJ IDEA and OpenJDK 17 must be installed
Tested with ms-17, JDK version 17.0.15

📊 Features

View product lists per store
Monitor discounts and promotions
Manage product alerts
Handle baskets with products
Simple HTML/JS frontend for interaction

⚙ How CSVs Are Used

CSV files are loaded via BufferedReader without external libraries
Products and discounts are parsed and stored in memory
Supports multiple stores with versioned CSVs

🔗 Live Links (Local)

Home: /home
Products: /products/store/{storeName}
Alerts: /alerts
Basket: /basket
Discounts: /discounts