use crate::{FlacDecodeError, FlacEncodeError};
use std::fmt::Debug;

/// An audio frame in a flac file
pub struct FlacAudioFrame {
	/// The audio frame
	pub data: Vec<u8>,
}

impl Debug for FlacAudioFrame {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		f.debug_struct("FlacAudioFrame")
			.field("data_len", &self.data.len())
			.finish()
	}
}

impl FlacAudioFrame {
	/// Decode the given data as a flac audio frame.
	/// This should start with a sync sequence.
	pub fn decode(data: &[u8]) -> Result<Self, FlacDecodeError> {
		if data.len() <= 2 {
			return Err(FlacDecodeError::MalformedBlock);
		}

		if !(data[0] == 0b1111_1111 && data[1] & 0b1111_1100 == 0b1111_1000) {
			return Err(FlacDecodeError::BadSyncBytes);
		}

		Ok(Self {
			data: Vec::from(data),
		})
	}
}

impl FlacAudioFrame {
	/// Encode this audio frame.
	pub fn encode(&self, target: &mut impl std::io::Write) -> Result<(), FlacEncodeError> {
		target.write_all(&self.data)?;
		return Ok(());
	}
}