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use crate::codec::{Codec, ParseBioErr};
use std::fmt;
use std::str::FromStr;

#[derive(Clone, Copy, Debug, PartialEq, Codec)]
#[width = 2]
#[repr(u8)]
pub enum Dna {
    A = 0b00,
    C = 0b01,
    G = 0b10,
    T = 0b11,
}

//type Kmer<const K: usize> = usize;

impl From<Dna> for char {
    fn from(dna: Dna) -> char {
        dna.to_char()
    }
}

impl TryFrom<char> for Dna {
    type Error = ParseBioErr;
    fn try_from(c: char) -> Result<Self, Self::Error> {
        Dna::from_char(c)
    }
}

impl From<u8> for Dna {
    fn from(b: u8) -> Self {
        Dna::unsafe_from_bits(b)
    }
}

impl From<Dna> for u8 {
    fn from(dna: Dna) -> Self {
        dna as u8
    }
}

impl FromStr for Dna {
    type Err = ParseBioErr;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Dna::try_from(s.as_bytes()[0] as char)
    }
}

impl fmt::Display for Dna {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}