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use crate::{
	Asn1DerError, DerObject, Sink, error::ErrorChain,
	typed::{ DerTypeView, DerDecodable, DerEncodable }
};


/// An ASN.1-DER boolean type view
#[derive(Copy, Clone)]
pub struct Boolean<'a> {
	object: DerObject<'a>
}
impl<'a> Boolean<'a> {
	/// Writes a new boolean object with `value` into `sink` and returns a type view over it
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	pub fn new<S: Sink + Into<&'a[u8]>>(value: bool, mut sink: S) -> Result<Self, Asn1DerError> {
		Self::write(value, &mut sink).propagate(e!("Failed to construct boolean"))?;
		let object = DerObject::decode(sink.into())
			.propagate(e!("Failed to load constructed boolean"))?;
		Ok(Self{ object })
	}
	/// Gets the boolean value
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	pub fn get(&self) -> bool {
		match self.object.value() {
			b"\x00" => false,
			// #implicit_validation: Since we validate this value at `load`, the only possible value
			// here is `b"\xff"` unless the underlying object has been modified in an invalid way
			_ => true
		}
	}
	
	/// Writes a boolean `value` as DER-object to `sink`
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	pub fn write<S: Sink>(value: bool, sink: &mut S) -> Result<(), Asn1DerError> {
		let value = match value {
			true => b"\xff".as_ref(),
			false => b"\x00".as_ref()
		};
		DerObject::write(Self::TAG, value.len(), &mut value.iter(), sink)
			.propagate(e!("Failed to write boolean"))
	}
}
impl<'a> DerTypeView<'a> for Boolean<'a> {
	const TAG: u8 = b'\x01';
	
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn object(&self) -> DerObject<'a> {
		self.object
	}
}
impl<'a> DerDecodable<'a> for Boolean<'a> {
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn load(object: DerObject<'a>) -> Result<Self, Asn1DerError> {
		match object.value() {
			_ if object.tag() != Self::TAG => Err(einval!("DER object is not a boolean"))?,
			b"\x00" | b"\xff" => Ok(Self{ object }),
			_ => Err(einval!("DER object is not a valid boolean"))
		}
	}
}
impl<'a> DerEncodable for Boolean<'a> {
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn encode<U: Sink>(&self, sink: &mut U) -> Result<(), Asn1DerError> {
		self.object().encode(sink).propagate(e!("Failed to encode boolean"))
	}
}


impl<'a> DerDecodable<'a> for bool {
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn load(object: DerObject<'a>) -> Result<Self, Asn1DerError> {
		let boolean = Boolean::load(object).propagate(e!("Failed to load boolean"))?;
		Ok(boolean.get())
	}
}
impl DerEncodable for bool {
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn encode<S: Sink>(&self, sink: &mut S) -> Result<(), Asn1DerError> {
		Boolean::write(*self, sink).propagate(e!("Failed to encode boolean"))
	}
}