A simple terminal-based simulation program for an online store that manages transactions between buyers and sellers. This program uses C++17 and is built using Meson & Ninja.

• Registration & Login for Buyers and Sellers
• Seller Management: Add and update items in their store
• Buyer Shopping: Browse items and make purchases
• Bank Transactions: Simulated balance transfers between bank accounts
• Order Status Management: Track orders (Paid, Completed, Cancelled)
• Admin Panels: Store and Bank admin menus with basic reporting
• Data Persistence: All data (users, items, orders, bank accounts) is saved to data/simulation_data.txt on exit and loaded on startup

Before you can compile and run this program, ensure you have:

1. C++ Compiler: GCC (g++) or Clang with C++17 support
2. Meson: Build system (meson)
3. Ninja: Build tool (ninja)

Arch Linux:

sudo pacman -S base-devel meson ninja

Ubuntu/Debian:

sudo apt install build-essential meson ninja-build

Windows: Install Python, then:

pip install meson ninja

You'll also need a C++ compiler (Visual Studio or MinGW).

1. Open terminal in the project root directory

2. Setup Meson (first time only):

   meson setup builddir

3. Compile the program:

   ninja -C builddir

   This creates an executable named online_store (Linux) or online_store.exe (Windows) in the builddir folder.

ninja -C builddir run

./builddir/online_store

Note: The program will automatically create the data/ folder and simulation_data.txt file if they don't exist. On subsequent runs, it will load previously saved data.

If you want to start fresh with no saved data:

rm -f data/simulation_data.txt

online-store-cpp/
├── meson.build              # Meson configuration file
├── main.cpp                 # Program entry point
├── include/                 # Header files (.h)
│   ├── Bank.h
│   ├── BankAccount.h
│   ├── BankTransaction.h
│   ├── Buyer.h
│   ├── Item.h
│   ├── Order.h
│   ├── Seller.h
│   ├── Store.h
│   └── Utils.h
├── src/                     # Implementation files (.cpp)
│   ├── Bank.cpp
│   ├── BankAccount.cpp
│   ├── BankTransaction.cpp
│   ├── Buyer.cpp
│   ├── Item.cpp
│   ├── Order.cpp
│   ├── Seller.cpp
│   ├── Store.cpp
│   └── Utils.cpp
├── data/                    # Data persistence folder
│   └── simulation_data.txt  # Auto-generated data file
├── builddir/                # Build output (created by Meson)
└── README.md                # This file

1. Login - Login with existing credentials
2. Register as Buyer - Create a new buyer account
3. Register as Seller - Create a new seller account with a store
4. Store Admin Menu - View store-wide reports
5. Bank Admin Menu - View bank customer reports
6. Exit & Save - Save all data and exit

• Browse all available items
• Purchase items (with bank balance)
• View order history
• Check daily spending
• Manage bank account (deposit/withdraw)

• All buyer features (sellers can also buy)
• Manage store items (add/update)
• View incoming orders
• Update order status
• Discover top K popular items in their store
• View loyal customers

Store Admin:

• View all transactions
• List paid but not completed orders
• View most frequent items
• View most active buyers/sellers

Bank Admin:

• List all bank customers
• View dormant accounts
• View top N most active users today
• View customer transactions

All data is automatically saved to data/simulation_data.txt when you select "Exit & Save" from the main menu. This includes:

• User accounts (buyers and sellers)
• Bank accounts and transaction history
• All items in the store
• All orders and their status

The data is automatically loaded when the program starts.

Program stuck at startup:

• Press Enter to continue past any pause prompts
• Check if data/ folder exists
• Try deleting data/simulation_data.txt to start fresh

Compilation errors:

• Ensure you have C++17 support: g++ --version (should be 7.0+)
• Make sure Meson and Ninja are installed: meson --version, ninja --version

Menu not displaying properly:

• Some terminals may have issues with screen clearing
• Try running in a different terminal emulator

This project is for educational purposes.

Feel free to fork and submit pull requests for improvements!