use crate::{Position, from_base36, to_base36};

#[derive(Debug, Eq, PartialEq)]
pub enum Transition {
    None,
    FadeToWhite,
    FadeToBlack,
    Wave,
    Tunnel,
    SlideUp,
    SlideDown,
    SlideLeft,
    SlideRight,
}

impl From<&str> for Transition {
    fn from(str: &str) -> Transition {
        match str {
            "fade_w"  => Transition::FadeToWhite,
            "fade_b"  => Transition::FadeToBlack,
            "wave"    => Transition::Wave,
            "tunnel"  => Transition::Tunnel,
            "slide_u" => Transition::SlideUp,
            "slide_d" => Transition::SlideDown,
            "slide_l" => Transition::SlideLeft,
            "slide_r" => Transition::SlideRight,
            _         => Transition::None,
        }
    }
}

impl ToString for Transition {
    fn to_string(&self) -> String {
        match &self {
            Transition::FadeToWhite => " FX fade_w",
            Transition::FadeToBlack => " FX fade_b",
            Transition::Wave        => " FX wave",
            Transition::Tunnel      => " FX tunnel",
            Transition::SlideUp     => " FX slide_u",
            Transition::SlideDown   => " FX slide_d",
            Transition::SlideLeft   => " FX slide_l",
            Transition::SlideRight  => " FX slide_r",
            Transition::None        => "",
        }.to_string()
    }
}

#[derive(Debug, Eq, PartialEq)]
pub struct Exit {
    /// destination
    pub room_id: u64,  /// id
    pub position: Position,
    pub effect: Transition,
}

impl From<String> for Exit {
    fn from(string: String) -> Exit {
        // e.g. "EXT 6,4 0 10,12 FX fade_w"
        let room_position_effect: Vec<&str> = string.split_whitespace().collect();
        let room_id = from_base36(room_position_effect[0]);
        let position = Position::from(room_position_effect[1].to_string());

        let effect = if room_position_effect.len() == 4 {
            Transition::from(room_position_effect[3])
        } else {
            Transition::None
        };

        Exit { room_id, position, effect }
    }
}

impl ToString for Exit {
    fn to_string(&self) -> String {
        format!(
            "{} {}{}",
            to_base36(self.room_id),
            self.position.to_string(),
            self.effect.to_string()
        )
    }
}

#[test]
fn test_exit_from_string() {
    assert_eq!(
        Exit::from("a 12,13".to_string()),
        Exit { room_id: 10, position: Position { x: 12, y: 13 }, effect: Transition::None }
    );
}

#[test]
fn test_exit_from_string_with_fx() {
    assert_eq!(
        Exit::from("a 12,13 FX slide_u".to_string()),
        Exit { room_id: 10, position: Position { x: 12, y: 13 }, effect: Transition::SlideUp }
    );
}

#[test]
fn test_exit_to_string() {
    assert_eq!(
        Exit { room_id: 8, position: Position { x: 5, y: 6 }, effect: Transition::None}.to_string(),
        "8 5,6".to_string()
    );
}

#[test]
fn test_exit_to_string_with_fx() {
    assert_eq!(
        Exit {
            room_id: 8,
            position: Position { x: 5, y: 6 },
            effect: Transition::FadeToWhite
        }.to_string(),
        "8 5,6 FX fade_w".to_string()
    );
}