fblog 4.15.0

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use chrono::{LocalResult, TimeZone, Utc};

fn timestamp_to_iso8601(timestamp: i64) -> Option<String> {
	let now = Utc::now();

	let dt_secs = Utc.timestamp_opt(timestamp, 0);
	let dt_millis = Utc.timestamp_millis_opt(timestamp);

	match (dt_secs, dt_millis) {
		(LocalResult::Single(dt_secs), LocalResult::Single(dt_millis)) => {
			let diff_secs = (now - dt_secs).num_milliseconds().abs();
			let diff_millis = (now - dt_millis).num_milliseconds().abs();

			if diff_secs < diff_millis {
				Some(dt_secs.to_rfc3339_opts(chrono::SecondsFormat::Millis, true))
			} else {
				Some(dt_millis.to_rfc3339_opts(chrono::SecondsFormat::Millis, true))
			}
		}
		(LocalResult::Single(dt_secs), _) => Some(dt_secs.to_rfc3339_opts(chrono::SecondsFormat::Millis, true)),
		(_, LocalResult::Single(dt_millis)) => Some(dt_millis.to_rfc3339_opts(chrono::SecondsFormat::Millis, true)),
		_ => None, // Neither is valid (or ambiguous due to time zone transitions)
	}
}

pub fn try_convert_timestamp_to_readable(input: String) -> String {
	if input.is_empty() {
		return input;
	}

	if let Some(parsed) = input.parse::<i64>().ok().and_then(timestamp_to_iso8601) {
		return parsed;
	}

	input
}

#[cfg(test)]
mod tests {
	use chrono::DateTime;

	use super::*;

	#[test]
	fn test_valid_second_timestamp() {
		let iso = "2024-05-21T11:21:29.000Z";
		let timestamp = DateTime::parse_from_rfc3339(iso).expect("should be valid").timestamp();
		let result = timestamp_to_iso8601(timestamp).unwrap();
		assert_eq!(iso, result)
	}

	#[test]
	fn test_valid_millis_timestamp() {
		let iso = "2024-05-21T11:21:29.536Z";
		let timestamp = DateTime::parse_from_rfc3339(iso).expect("should be valid").timestamp_millis();
		let result = timestamp_to_iso8601(timestamp).unwrap();
		assert_eq!(iso, result)
	}

	#[test]
	fn test_try_convert() {
		assert_eq!(try_convert_timestamp_to_readable("1716292213381".to_string()), "2024-05-21T11:50:13.381Z");
		assert_eq!(try_convert_timestamp_to_readable("1716292213".to_string()), "2024-05-21T11:50:13.000Z");
		assert_eq!(try_convert_timestamp_to_readable("bla".to_string()), "bla");
		assert_eq!(try_convert_timestamp_to_readable("1234bla".to_string()), "1234bla");
		assert_eq!(try_convert_timestamp_to_readable("".to_string()), "");
	}
}