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use std::convert::From;
use std::str::FromStr;

/// The 8 standard colors.
#[derive(Debug,PartialEq, Eq)]
pub enum Color {
    Black,
    Red,
    Green,
    Yellow,
    Blue,
    Magenta,
    Cyan,
    White,
}
impl Color {
    pub fn to_fg_str(&self) -> &str {
        match *self {
            Color::Black => "30",
            Color::Red => "31",
            Color::Green => "32",
            Color::Yellow => "33",
            Color::Blue => "34",
            Color::Magenta => "35",
            Color::Cyan => "36",
            Color::White => "37",
        }
    }

    pub fn to_bg_str(&self) -> &str {
        match *self {
            Color::Black => "40",
            Color::Red => "41",
            Color::Green => "42",
            Color::Yellow => "43",
            Color::Blue => "44",
            Color::Magenta => "45",
            Color::Cyan => "46",
            Color::White => "47",
        }
    }
}

impl<'a> From<&'a str> for Color {
    fn from(src: &str) -> Self {

        src.parse().unwrap_or(Color::White)
    }
}

impl From<String> for Color {
    fn from(src: String) -> Self {

        src.parse().unwrap_or(Color::White)
    }
}

impl FromStr for Color {
    type Err = ();

    fn from_str(src: &str) -> Result<Self, Self::Err> {

        let src = src.to_lowercase();

        match src.as_ref() {
            "black" => Ok(Color::Black),
            "red" => Ok(Color::Red),
            "green" => Ok(Color::Green),
            "yellow" => Ok(Color::Yellow),
            "blue" => Ok(Color::Blue),
            "magenta" => Ok(Color::Magenta),
            "cyan" => Ok(Color::Cyan),
            "white" => Ok(Color::White),
            _ => Err(()),
        }
    }
}

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

    mod from_str {
        pub use super::*;

        macro_rules! make_test {
            ( $( $name:ident: $src:expr => $dst:expr),* ) => {

                $(
                    #[test]
                    fn $name() {
                        let color : Color = $src.into();
                        assert_eq!($dst, color)
                    }
                )*
            }
        }

        make_test!(
            black: "black" => Color::Black,
            red: "red" => Color::Red,
            green: "green" => Color::Green,
            yellow: "yellow" => Color::Yellow,
            blue: "blue" => Color::Blue,
            magenta: "magenta" => Color::Magenta,
            cyan: "cyan" => Color::Cyan,
            white: "white" => Color::White,

            invalid: "invalid" => Color::White,
            capitalized: "BLUE" => Color::Blue,
            mixed_case: "bLuE" => Color::Blue
        );
    }

    mod from_string {
        pub use super::*;

        macro_rules! make_test {
            ( $( $name:ident: $src:expr => $dst:expr),* ) => {

                $(
                    #[test]
                    fn $name() {
                        let src = String::from($src);
                        let color : Color = src.into();
                        assert_eq!($dst, color)
                    }
                )*
            }
        }

        make_test!(
            black: "black" => Color::Black,
            red: "red" => Color::Red,
            green: "green" => Color::Green,
            yellow: "yellow" => Color::Yellow,
            blue: "blue" => Color::Blue,
            magenta: "magenta" => Color::Magenta,
            cyan: "cyan" => Color::Cyan,
            white: "white" => Color::White,

            invalid: "invalid" => Color::White,
            capitalized: "BLUE" => Color::Blue,
            mixed_case: "bLuE" => Color::Blue
        );
    }

    mod fromstr {
        pub use super::*;

        #[test]
        fn parse() {
            let color: Result<Color, _> = "blue".parse();
            assert_eq!(Ok(Color::Blue), color)
        }

        #[test]
        fn error() {
            let color: Result<Color, ()> = "bloublou".parse();
            assert_eq!(Err(()), color)
        }


    }
}