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use std::mem;
use std::str::FromStr;

#[derive(Clone, Copy, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
pub enum AudioFormat {
    F64,
    F32,
    S32,
    S24,
    S24_3,
    S16,
}

impl FromStr for AudioFormat {
    type Err = ();
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_uppercase().as_ref() {
            "F64" => Ok(Self::F64),
            "F32" => Ok(Self::F32),
            "S32" => Ok(Self::S32),
            "S24" => Ok(Self::S24),
            "S24_3" => Ok(Self::S24_3),
            "S16" => Ok(Self::S16),
            _ => Err(()),
        }
    }
}

impl Default for AudioFormat {
    fn default() -> Self {
        Self::S16
    }
}

impl AudioFormat {
    // not used by all backends
    #[allow(dead_code)]
    pub fn size(&self) -> usize {
        match self {
            Self::F64 => mem::size_of::<f64>(),
            Self::F32 => mem::size_of::<f32>(),
            Self::S24_3 => mem::size_of::<i64>(),
            Self::S16 => mem::size_of::<i16>(),
            _ => mem::size_of::<i32>(), // S32 and S24 are both stored in i32
        }
    }
}