use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
/// This is CJK 中文🎊 for test line, column.
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

// Document colors: #FF0033, #00AA33, #0033FF, #FFAA33

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    //
    // Use `Command-click` on `Duration` will jump to its definition.
    // Use `Control-click` on `String`, `HashMap` or `Result` will open its documentation page.
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;
use tokio::time;

// Version number of the HelloWorld struct
const VERSION: &str = "1.0.0";

/// HelloWorld struct provides greeting functionality with configuration options
///
/// # Features
/// - Async greetings with customizable names
/// - Configuration management via HashMap
/// - Report generation
/// - Error handling with custom error types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HelloWorld {
    name: String,
    #[serde(skip)]
    options: HashMap<String, serde_json::Value>,
    created_at: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, thiserror::Error)]
pub enum HelloError {
    #[error("Invalid name: {0}")]
    InvalidName(String),
    #[error("Operation timeout")]
    Timeout,
}

type Result<T> = std::result::Result<T, HelloError>;

impl HelloWorld {
    pub fn new(name: impl Into<String>) -> Self {
        Self {
            name: name.into(),
            options: HashMap::new(),
            created_at: chrono::Utc::now(),
        }
    }

    // Greets multiple people asynchronously with configurable delay
    pub async fn greet<T: AsRef<str>>(&self, names: &[T]) -> Result<()> {
        for name in names {
            time::sleep(Duration::from_millis(100)).await;
            println!("Hello, {}!", name.as_ref());
        }
        Ok(())
    }

    fn generate_report(&self) -> String {
        format!(
            "HelloWorld Report\n================\nName: {}\nCreated: {}\nOptions: {:?}",
            self.name, self.created_at, self.options
        )
    }
}

trait Configurable {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>);
    fn is_configured(&self) -> bool;
}

impl Configurable for HelloWorld {
    fn configure(&mut self, options: HashMap<String, serde_json::Value>) {
        self.options.extend(options);
    }

    fn is_configured(&self) -> bool {
        !self.options.is_empty()
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let mut greeter = HelloWorld::new("Rust");

    let mut config = HashMap::new();
    config.insert("timeout".to_string(), serde_json::json!(5000));
    config.insert("retries".to_string(), serde_json::json!(3));

    greeter.configure(config);

    match greeter.greet(&["Alice", "Bob"]).await {
        Ok(_) => println!("Greetings sent successfully"),
        Err(e) => eprintln!("Error: {}", e),
    }

    Ok(())
}
