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//! Raw SAM record quality scores.

/// Raw SAM record quality scores.
#[derive(Debug, Eq, PartialEq)]
pub struct QualityScores<'a>(&'a [u8]);

impl<'a> QualityScores<'a> {
    pub(super) fn new(buf: &'a [u8]) -> Self {
        Self(buf)
    }

    /// Returns whether there are any scores.
    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }

    /// Returns the number of scores.
    pub fn len(&self) -> usize {
        self.0.len()
    }
}

impl<'a> crate::alignment::record::QualityScores for QualityScores<'a> {
    fn is_empty(&self) -> bool {
        self.is_empty()
    }

    fn len(&self) -> usize {
        self.len()
    }

    fn iter(&self) -> Box<dyn Iterator<Item = u8> + '_> {
        const OFFSET: u8 = b'!';
        Box::new(self.as_ref().iter().map(|&b| b - OFFSET))
    }
}

impl<'a> AsRef<[u8]> for QualityScores<'a> {
    fn as_ref(&self) -> &[u8] {
        self.0
    }
}