use serde_derive::{Deserialize, Serialize};
use std::fmt;
use std::path::PathBuf;
use std::slice::Iter;

// TODO - write some impl stuff in here so the main GUI stuff
// is a little bit more decoupled from this. I think a Display
// and perhaps the path to string conversion too could be
// removed from the GUI part

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct WadInfo {
    pub path: PathBuf,
    pub name: String,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct LauncherInfo {
    pub path: PathBuf,
    pub name: String,
}

#[derive(PartialEq, Clone, Copy)]
pub enum Difficulty {
    None,
    Baby,
    Easy,
    Medium,
    Hard,
    Nightmare,
}

impl fmt::Display for Difficulty {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Difficulty::Baby => write!(f, "I'm too young to die"),
            Difficulty::Easy => write!(f, "Hey, not too rough"),
            Difficulty::Medium => write!(f, "Hurt me plenty"),
            Difficulty::Hard => write!(f, "Ultra-Violence"),
            Difficulty::Nightmare => write!(f, "Nightmare!"),
            Difficulty::None => write!(f, "None"),
        }
    }
}

impl Difficulty {
    pub fn iterator() -> Iter<'static, Difficulty> {
        static DIFFICULTIES: [Difficulty; 6] = [
            Difficulty::None,
            Difficulty::Baby,
            Difficulty::Easy,
            Difficulty::Medium,
            Difficulty::Hard,
            Difficulty::Nightmare,
        ];
        DIFFICULTIES.iter()
    }
}