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


/// An ASN.1-DER octet string view
#[derive(Copy, Clone)]
pub struct OctetString<'a> {
	object: DerObject<'a>
}
impl<'a> OctetString<'a> {
	/// Writes a new octet string 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: &[u8], mut sink: S) -> Result<Self, Asn1DerError> {
		Self::write(value, &mut sink).propagate(e!("Failed to construct octet string"))?;
		let object = DerObject::decode(sink.into())
			.propagate(e!("Failed to load constructed octet string"))?;
		Ok(Self{ object })
	}
	/// Gets the octet string value
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	pub fn get(&self) -> &[u8] {
		self.object.value()
	}
	
	/// Writes an octet string `value` as DER-object to `sink`
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	pub fn write<S: Sink>(value: &[u8], sink: &mut S) -> Result<(), Asn1DerError> {
		DerObject::write(Self::TAG, value.len(), &mut value.iter(), sink)
			.propagate(e!("Failed to write octet string"))
	}
}
impl<'a> DerTypeView<'a> for OctetString<'a> {
	const TAG: u8 = b'\x04';
	
	#[cfg_attr(feature = "no_panic", no_panic::no_panic)]
	fn object(&self) -> DerObject<'a> {
		self.object
	}
}
impl<'a> DerDecodable<'a> for OctetString<'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 an octet string"))?,
			_ => Ok(Self{ object })
		}
	}
}
impl<'a> DerEncodable for OctetString<'a> {
	/// Encodes `self` to `sink`
	#[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 octet string"))
	}
}


#[cfg(not(any(feature = "no_std", feature = "no_panic")))]
impl<'a> DerDecodable<'a> for Vec<u8> {
	fn load(object: DerObject<'a>) -> Result<Self, Asn1DerError> {
		let octet_string = OctetString::load(object).propagate(e!("Failed to load octet string"))?;
		Ok(octet_string.get().to_vec())
	}
}
#[cfg(not(any(feature = "no_std", feature = "no_panic")))]
impl DerEncodable for Vec<u8> {
	fn encode<S: Sink>(&self, sink: &mut S) -> Result<(), Asn1DerError> {
		OctetString::write(self, sink).propagate(e!("Failed to encode octet string"))
	}
}