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#[derive(Debug, Eq, PartialEq)]
pub struct Colour {
    pub(crate) red: u8,
    pub(crate) green: u8,
    pub(crate) blue: u8,
}

impl From<String> for Colour {
    fn from(string: String) -> Colour {
        let values: Vec<&str> = string.split(',').collect();

        let red:   u8 = values[0].parse().unwrap_or(0);
        let green: u8 = values[1].parse().unwrap_or(0);
        let blue:  u8 = values[2].parse().unwrap_or(0);

        Colour { red, green, blue }
    }
}

impl ToString for Colour {
    #[inline]
    fn to_string(&self) -> String {
        format!("{},{},{}", self.red, self.green, self.blue)
    }
}


#[test]
fn test_colour_from_string() {
    assert_eq!(
        Colour::from("0,255,0".to_string()),
        Colour { red: 0, green: 255, blue: 0 }
    );
}

#[test]
fn test_colour_to_string() {
    assert_eq!(
        Colour { red: 22, green: 33, blue: 44 }.to_string(),
        "22,33,44".to_string()
    );
}