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use locspan_derive::StrippedPartialEq;
use std::fmt;

/// Internationalized string direction.
///
/// Specifies the direction used to read a string.
/// This can be either left-to-right (`"ltr"`) or right-to-left (`"rtl"`).
#[derive(Clone, Copy, PartialEq, StrippedPartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub enum Direction {
	/// Left-to-right direction.
	Ltr,

	/// Right-to-left direction.
	Rtl,
}

impl Direction {
	pub fn as_str(&self) -> &'static str {
		match self {
			Direction::Ltr => "ltr",
			Direction::Rtl => "rtl",
		}
	}
}

impl<'a> TryFrom<&'a str> for Direction {
	type Error = &'a str;

	/// Convert the strings `"rtl"` and `"ltr"` into a `Direction`.
	#[inline(always)]
	fn try_from(name: &'a str) -> Result<Direction, &'a str> {
		match name {
			"ltr" => Ok(Direction::Ltr),
			"rtl" => Ok(Direction::Rtl),
			_ => Err(name),
		}
	}
}

impl fmt::Display for Direction {
	#[inline(always)]
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		match self {
			Direction::Ltr => write!(f, "ltr"),
			Direction::Rtl => write!(f, "rtl"),
		}
	}
}