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//! Averaging Window Information Element
//!
//! The Averaging Window IE indicates the time window in milliseconds over which to average
//! QoS metrics for measurement and reporting purposes.
//! Per 3GPP TS 29.244 Section 8.2.115.
use crate::error::PfcpError;
use crate::ie::{Ie, IeType};
/// Averaging Window
///
/// Specifies the time window in milliseconds for averaging QoS measurements.
/// Used in quality of service monitoring and reporting to define the measurement period
/// over which QoS parameters are averaged before being reported.
///
/// # 3GPP Reference
/// 3GPP TS 29.244 Section 8.2.115
///
/// # Structure
/// - 4 bytes: Time window value in milliseconds (u32, big-endian)
///
/// # Examples
///
/// ```
/// use rs_pfcp::ie::averaging_window::AveragingWindow;
///
/// // Create a 60,000 millisecond (60 second) averaging window
/// let window = AveragingWindow::new(60000);
/// assert_eq!(window.milliseconds(), 60000);
///
/// // Marshal and unmarshal
/// let bytes = window.marshal();
/// let parsed = AveragingWindow::unmarshal(&bytes)?;
/// assert_eq!(window, parsed);
/// # Ok::<(), rs_pfcp::error::PfcpError>(())
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct AveragingWindow {
/// Time window in milliseconds
milliseconds: u32,
}
impl AveragingWindow {
/// Create a new Averaging Window
///
/// # Arguments
/// * `milliseconds` - Time window in milliseconds (0 to u32::MAX)
///
/// # Example
/// ```
/// use rs_pfcp::ie::averaging_window::AveragingWindow;
///
/// let window = AveragingWindow::new(300000); // 300 seconds
/// assert_eq!(window.milliseconds(), 300000);
/// ```
pub fn new(milliseconds: u32) -> Self {
AveragingWindow { milliseconds }
}
/// Get the averaging window in milliseconds
///
/// # Example
/// ```
/// use rs_pfcp::ie::averaging_window::AveragingWindow;
///
/// let window = AveragingWindow::new(120000); // 120 seconds
/// assert_eq!(window.milliseconds(), 120000);
/// ```
pub fn milliseconds(&self) -> u32 {
self.milliseconds
}
/// Marshal Averaging Window to bytes
///
/// # Returns
/// 4-byte vector containing window value in milliseconds (big-endian)
pub fn marshal(&self) -> Vec<u8> {
self.milliseconds.to_be_bytes().to_vec()
}
/// Marshal to a buffer
pub fn marshal_to(&self, buf: &mut Vec<u8>) {
buf.extend_from_slice(&self.milliseconds.to_be_bytes());
}
/// Unmarshal Averaging Window from bytes
///
/// # Arguments
/// * `data` - Byte slice containing averaging window data (must be at least 4 bytes)
///
/// # Errors
/// Returns error if data is too short
///
/// # Example
/// ```
/// use rs_pfcp::ie::averaging_window::AveragingWindow;
///
/// let window = AveragingWindow::new(1800000); // 1800 seconds = 30 minutes
/// let bytes = window.marshal();
/// let parsed = AveragingWindow::unmarshal(&bytes)?;
/// assert_eq!(window, parsed);
/// # Ok::<(), rs_pfcp::error::PfcpError>(())
/// ```
pub fn unmarshal(data: &[u8]) -> Result<Self, PfcpError> {
if data.len() < 4 {
return Err(PfcpError::invalid_length(
"Averaging Window",
IeType::AveragingWindow,
4,
data.len(),
));
}
let bytes: [u8; 4] = data[0..4].try_into().unwrap();
let milliseconds = u32::from_be_bytes(bytes);
Ok(AveragingWindow { milliseconds })
}
/// Convert to generic IE
///
/// # Example
/// ```
/// use rs_pfcp::ie::averaging_window::AveragingWindow;
/// use rs_pfcp::ie::IeType;
///
/// let window = AveragingWindow::new(600000); // 600 seconds = 10 minutes
/// let ie = window.to_ie();
/// assert_eq!(ie.ie_type, IeType::AveragingWindow);
/// ```
pub fn to_ie(&self) -> Ie {
Ie::new(IeType::AveragingWindow, self.marshal())
}
// Convenience constructors for common averaging windows
/// Create a 10 millisecond averaging window
pub fn ten_milliseconds() -> Self {
AveragingWindow { milliseconds: 10 }
}
/// Create a 100 millisecond averaging window
pub fn hundred_milliseconds() -> Self {
AveragingWindow { milliseconds: 100 }
}
/// Create a 1-second (1000 millisecond) averaging window
pub fn one_second() -> Self {
AveragingWindow { milliseconds: 1000 }
}
/// Create a 10-second (10,000 millisecond) averaging window
pub fn ten_seconds() -> Self {
AveragingWindow {
milliseconds: 10000,
}
}
/// Create a 1-minute (60,000 millisecond) averaging window
pub fn one_minute() -> Self {
AveragingWindow {
milliseconds: 60000,
}
}
/// Create a 5-minute (300,000 millisecond) averaging window
pub fn five_minutes() -> Self {
AveragingWindow {
milliseconds: 300000,
}
}
/// Create a 10-minute (600,000 millisecond) averaging window
pub fn ten_minutes() -> Self {
AveragingWindow {
milliseconds: 600000,
}
}
/// Create a 30-minute (1,800,000 millisecond) averaging window
pub fn thirty_minutes() -> Self {
AveragingWindow {
milliseconds: 1800000,
}
}
/// Create a 1-hour (3,600,000 millisecond) averaging window
pub fn one_hour() -> Self {
AveragingWindow {
milliseconds: 3600000,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_averaging_window_new() {
let window = AveragingWindow::new(300000);
assert_eq!(window.milliseconds(), 300000);
}
#[test]
fn test_averaging_window_marshal_unmarshal() {
let original = AveragingWindow::new(600000);
let bytes = original.marshal();
assert_eq!(bytes.len(), 4);
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(original, parsed);
assert_eq!(parsed.milliseconds(), 600000);
}
#[test]
fn test_averaging_window_marshal_zero() {
let window = AveragingWindow::new(0);
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(window, parsed);
assert_eq!(parsed.milliseconds(), 0);
}
#[test]
fn test_averaging_window_marshal_max_value() {
let window = AveragingWindow::new(u32::MAX);
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(window, parsed);
assert_eq!(parsed.milliseconds(), u32::MAX);
}
#[test]
fn test_averaging_window_unmarshal_short() {
let data = vec![0x00, 0x00, 0x00]; // Only 3 bytes
let result = AveragingWindow::unmarshal(&data);
assert!(result.is_err());
let err = result.unwrap_err();
assert!(matches!(err, PfcpError::InvalidLength { .. }));
}
#[test]
fn test_averaging_window_unmarshal_empty() {
let data = vec![];
let result = AveragingWindow::unmarshal(&data);
assert!(result.is_err());
let err = result.unwrap_err();
assert!(matches!(err, PfcpError::InvalidLength { .. }));
}
#[test]
fn test_averaging_window_to_ie() {
let window = AveragingWindow::new(120000);
let ie = window.to_ie();
assert_eq!(ie.ie_type, IeType::AveragingWindow);
assert_eq!(ie.payload.len(), 4);
// Verify IE can be unmarshaled
let parsed = AveragingWindow::unmarshal(&ie.payload).unwrap();
assert_eq!(window, parsed);
}
#[test]
fn test_averaging_window_round_trip_various() {
let values = vec![
1, 10, 100, 1000, 10000, 60000, 300000, 600000, 1800000, 3600000,
];
for milliseconds in values {
let original = AveragingWindow::new(milliseconds);
let bytes = original.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(original, parsed, "Failed for {} ms", milliseconds);
}
}
#[test]
fn test_averaging_window_convenience_ten_milliseconds() {
let window = AveragingWindow::ten_milliseconds();
assert_eq!(window.milliseconds(), 10);
}
#[test]
fn test_averaging_window_convenience_hundred_milliseconds() {
let window = AveragingWindow::hundred_milliseconds();
assert_eq!(window.milliseconds(), 100);
}
#[test]
fn test_averaging_window_convenience_one_second() {
let window = AveragingWindow::one_second();
assert_eq!(window.milliseconds(), 1000);
}
#[test]
fn test_averaging_window_convenience_ten_seconds() {
let window = AveragingWindow::ten_seconds();
assert_eq!(window.milliseconds(), 10000);
}
#[test]
fn test_averaging_window_convenience_one_minute() {
let window = AveragingWindow::one_minute();
assert_eq!(window.milliseconds(), 60000);
}
#[test]
fn test_averaging_window_convenience_five_minutes() {
let window = AveragingWindow::five_minutes();
assert_eq!(window.milliseconds(), 300000);
}
#[test]
fn test_averaging_window_convenience_ten_minutes() {
let window = AveragingWindow::ten_minutes();
assert_eq!(window.milliseconds(), 600000);
}
#[test]
fn test_averaging_window_convenience_thirty_minutes() {
let window = AveragingWindow::thirty_minutes();
assert_eq!(window.milliseconds(), 1800000);
}
#[test]
fn test_averaging_window_convenience_one_hour() {
let window = AveragingWindow::one_hour();
assert_eq!(window.milliseconds(), 3600000);
}
#[test]
fn test_averaging_window_clone() {
let window1 = AveragingWindow::new(1200000);
let window2 = window1;
assert_eq!(window1, window2);
}
#[test]
fn test_averaging_window_5g_qos_monitoring() {
// Scenario: Monitor QoS metrics over 5-minute windows
let window = AveragingWindow::five_minutes();
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(parsed.milliseconds(), 300000);
assert_eq!(window, parsed);
}
#[test]
fn test_averaging_window_real_world_short_burst() {
// Scenario: Quick monitoring window for burst detection
let window = AveragingWindow::new(100); // 100 ms
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(parsed.milliseconds(), 100);
}
#[test]
fn test_averaging_window_real_world_long_measurement() {
// Scenario: Long-term monitoring for SLA analysis
let window = AveragingWindow::one_hour();
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(parsed.milliseconds(), 3600000);
}
#[test]
fn test_averaging_window_byte_order() {
// Verify big-endian encoding
let window = AveragingWindow::new(0x12345678);
let bytes = window.marshal();
assert_eq!(bytes, vec![0x12, 0x34, 0x56, 0x78]);
}
#[test]
fn test_averaging_window_millisecond_precision() {
// Verify millisecond precision
let window = AveragingWindow::new(1234);
let bytes = window.marshal();
let parsed = AveragingWindow::unmarshal(&bytes).unwrap();
assert_eq!(parsed.milliseconds(), 1234);
}
}