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//! # 🧳 booking_kit
//!
//! A powerful and extensible booking toolkit for Rust — featuring core data structures, flexible status logic, and seamless integration into any reservation system.
//!
//! `booking_kit` is a generic and extensible toolkit designed to handle the core logic for booking systems in Rust.
//! This crate provides structures, status management, and error handling that are essential
//! for creating a reservation or booking system.
//!
//! A modular and extensible toolkit for building custom booking logic.
//!
//! Designed to be flexible and reusable across various applications—such as travel, hotels, events, or any system requiring reservations—
//! without relying on specific external services.
//!
//! ---
//!
//! ## 🚀 Features
//!
//! - 📦 **Core Data Structures** — Defines `Booking`, `BookingItem`, and `BookingStatus` for handling bookings and items.
//! - 🔄 **Status Management** — Offers predefined booking statuses such as `Pending`, `Confirmed`, `Canceled`, and more.
//! - ⚠️ **Error Handling** — Provides a set of errors like `ItemUnavailable`, `QuantityExceeded`, and `InvalidStatus` to handle common booking-related issues.
//! - 🛠️ **Metadata Support** — Customize your bookings with additional metadata for each item.
//!
//! ---
//!
//! ## 🧰 Core Components
//!
//! - **BookingManager** — Handles your booking lifecycle—create, confirm, cancel, or expire your bookings.
//! - **Booking** — A flexible struct to hold booking details, like ID, status, and the item you're booking.
//! - **BookingStatus** — A friendly enum to manage all the possible states your booking can be in.
//! - **Error Types** — Robust error handling for any booking mishaps.
//! ---
//!
//! ## 💡 Quick Start
//!
//! ```rust
//! use serde::{Deserialize, Serialize};
//! use booking_kit::manager::BookingManager;
//! use booking_kit::traits::Bookable;
//!
//! #[derive(Debug, Deserialize, Serialize)]
//! struct Room { id: &'static str }
//! impl Bookable for Room {
//! fn id(&self) -> &str { self.id }
//! fn is_available(&self) -> bool { true }
//! }
//!
//! #[derive(Debug, Deserialize, Serialize)]
//! struct HotelRoom { id: &'static str, occupied: bool }
//! impl Bookable for HotelRoom {
//! fn id(&self) -> &str { self.id }
//! fn is_available(&self) -> bool { !self.occupied }
//! }
//!
//! fn main() -> Result<(), Box<dyn std::error::Error>> {
//! let available_room = Room { id: "R101" };
//! let booking = BookingManager::create(
//! "booking-001", None, available_room, "now", None, None::<()>
//! );
//!
//! let json = serde_json::to_string_pretty(&booking)?;
//! println!("Booking : \n{}\n", json);
//! println!("Booking created for: {}", booking.item_id());
//!
//! let occupied_room = HotelRoom { id: "R404", occupied: true };
//! match BookingManager::try_create(
//! "booking-002", Some("user-456"), occupied_room, "now", None, None::<()>
//! ) {
//! Ok(bk) => println!("Booking successful.{:?}", bk),
//! Err(e) => println!("Booking failed: {}", e),
//! }
//!
//! Ok(())
//! }
//! ```
//!
//! ---
//!
//! ## 📄 License
//!
//! Licensed under the [Apache-2.0 license](http://www.apache.org/licenses/LICENSE-2.0.txt)
//!
//! ---
//!
//! ## 👨 Author
//!
//! Jerry Maheswara <jerrymaheswara@gmail.com>
//!
//! ---
//!
//! ## ❤️ Built with Love in Rust
//!
//! This project is built with ❤️ using **Rust** — a systems programming language that is safe, fast, and concurrent.
//! Rust is the perfect choice for building reliable and efficient applications.
//!
//! ---
//!
//! ## 🤝 Contributing
//!
//! Pull requests, issues, and feedback are welcome!
//! If you find this crate useful, give it a ⭐ and share it with others in the Rustacean community.
//!
//! ---
/// Core data model definitions for booking operations.