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use std::fmt;

/// A VCF record field.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Field {
    /// Chromosome (`CHROM`).
    Chromosome,
    /// Start position (`POS`).
    Position,
    /// IDs (`ID`).
    Ids,
    /// Reference bases (`REF`).
    ReferenceBases,
    /// Alternate bases (`ALT`).
    AlternateBases,
    /// Quality score (`QUAL`).
    QualityScore,
    /// Filters (`FILTER`).
    Filters,
    /// Additional information (`INFO`).
    Info,
    /// Genotype format (`FORMAT`).
    Format,
}

impl AsRef<str> for Field {
    fn as_ref(&self) -> &str {
        match self {
            Self::Chromosome => "CHROM",
            Self::Position => "POS",
            Self::Ids => "ID",
            Self::ReferenceBases => "REF",
            Self::AlternateBases => "ALT",
            Self::QualityScore => "QUAL",
            Self::Filters => "FILTER",
            Self::Info => "INFO",
            Self::Format => "FORMAT",
        }
    }
}

impl fmt::Display for Field {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(self.as_ref())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_fmt() {
        assert_eq!(Field::Chromosome.to_string(), "CHROM");
        assert_eq!(Field::Position.to_string(), "POS");
        assert_eq!(Field::Ids.to_string(), "ID");
        assert_eq!(Field::ReferenceBases.to_string(), "REF");
        assert_eq!(Field::AlternateBases.to_string(), "ALT");
        assert_eq!(Field::QualityScore.to_string(), "QUAL");
        assert_eq!(Field::Filters.to_string(), "FILTER");
        assert_eq!(Field::Info.to_string(), "INFO");
        assert_eq!(Field::Format.to_string(), "FORMAT");
    }
}