📚 Online Book Reader

A console-based C++ application that allows users to read books, manage reading sessions, and for administrators to manage the library catalog.

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Features

For Readers (Customers)

• Browse the full book catalog
• Open books and navigate page by page
• Create and resume reading sessions per book
• View all personal reading sessions

For Administrators

• Add new books with custom page content
• Remove books from the library
• View the current book catalog

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Architecture

The project follows a layered service architecture with clear separation of concerns:

App (Entry Point)
├── UI Layer          → ConsoleUI / UI (abstract interface)
├── Auth Layer        → AuthenticationService
├── Data Layer        → DatastoreService
├── Domain Services   → LibraryService, SessionService
└── Models            → User (Admin/Customer), Book, Session

Class Overview

Class	Responsibility
App	Main controller — orchestrates login, menus, and navigation
ConsoleUI	Concrete implementation of the UI interface for terminal I/O
UI	Abstract interface for all user interaction (swappable)
AuthenticationService	Handles login and logout using DatastoreService
DatastoreService	Static in-memory store for user accounts
LibraryService	Manages the book collection and reading (page navigation)
SessionService	Manages reading sessions (create, resume, list, delete)
User	Abstract base class; extended by Admin and Customer
Book	Represents a book with name, author, and pages
Session	Tracks a user's reading position in a book

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Project Structure

.
├── main.cpp            # App, ConsoleUI, DatastoreService, AuthenticationService,
│                       # LibraryService, SessionService
├── User.h              # User (abstract), Admin, Customer
├── Book.h              # Book class
├── Session.h           # Session class
└── UI.h                # UI abstract interface

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Getting Started

Prerequisites

• A C++11 (or later) compatible compiler (e.g., g++, clang++)

Build & Run

make && ./app

Default Accounts

Username	Password	Role
mohamedAmr26	examplePassword1	Customer
ahmedSasa57	examplePassword2	Customer
seriousAdmin	adminPassword1	Admin

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Usage

Customer Flow

1. Log in with a customer account
2. Select Book List to browse available books
3. Choose a book → select an existing session or create a new one
4. Navigate pages using the Previous / Next / Save & Exit controls
5. Return to the main menu to continue from where you left off via My Reading Sessions

Admin Flow

1. Log in with an admin account
2. Select Modify Library
3. Choose to Add, Remove, or View books

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Design Notes

• UI is abstracted via the UI interface, making it straightforward to swap ConsoleUI for a GUI or web frontend without changing the core logic.
• Services are stateless singletons using static methods and static storage — suitable for a single-process, in-memory application.
• Sessions persist within a run — data is held in memory and resets on exit (no file/database persistence).
• Admin removing a book also cleans up all associated sessions via SessionService::remove_sessions_for_book.