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use std::convert::TryFrom;
use std::fmt;

#[derive(Debug, Copy, Clone)]
#[repr(u32)]
/// Quantization for the colorspace.
///
/// The driver decides this for capture streams and the user sets
/// it for output streams.
pub enum Quantization {
    /// default for the colorspace
    Default = 0,
    /// maps to the full range; 0 goes to 0 and 1 goes to 255
    FullRange = 1,
    /// maps to a limited range; 0 goes to 16 and 1 goes to 235
    LimitedRange = 2,
}

impl fmt::Display for Quantization {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Default => write!(f, "default"),
            Self::FullRange => write!(f, "full range"),
            Self::LimitedRange => write!(f, "limited range"),
        }
    }
}

impl TryFrom<u32> for Quantization {
    type Error = ();

    fn try_from(code: u32) -> Result<Self, Self::Error> {
        match code {
            0 => Ok(Self::Default),
            1 => Ok(Self::FullRange),
            2 => Ok(Self::LimitedRange),
            _ => Err(()),
        }
    }
}