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//! Platform-specific extensions to `web-time` for the Web platform.

#![allow(clippy::absolute_paths)]

use std::time::SystemTime as StdSystemTime;

use crate::SystemTime;

/// Web-specific extension to [`web_time::SystemTime`](crate::SystemTime).
pub trait SystemTimeExt {
	/// Convert [`web_time::SystemTime`](crate::SystemTime) to
	/// [`std::time::SystemTime`].
	///
	/// # Note
	///
	/// This might give a misleading impression of compatibility!
	///
	/// Considering this functionality will probably be used to interact with
	/// incompatible APIs of other dependencies, care should be taken that the
	/// dependency in question doesn't call [`std::time::SystemTime::now()`]
	/// internally, which would panic.
	fn to_std(self) -> std::time::SystemTime;

	/// Convert [`std::time::SystemTime`] to
	/// [`web_time::SystemTime`](crate::SystemTime).
	///
	/// # Note
	///
	/// This might give a misleading impression of compatibility!
	///
	/// Considering this functionality will probably be used to interact with
	/// incompatible APIs of other dependencies, care should be taken that the
	/// dependency in question doesn't call [`std::time::SystemTime::now()`]
	/// internally, which would panic.
	fn from_std(time: std::time::SystemTime) -> SystemTime;
}

impl SystemTimeExt for SystemTime {
	fn to_std(self) -> std::time::SystemTime {
		StdSystemTime::UNIX_EPOCH + self.0
	}

	fn from_std(time: std::time::SystemTime) -> SystemTime {
		Self::UNIX_EPOCH
			+ time
				.duration_since(StdSystemTime::UNIX_EPOCH)
				.expect("found `SystemTime` earlier then unix epoch")
	}
}