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//! Guardian deity types

use errors::UnknownVariant;

use std::fmt::{Display, Formatter, Result as FmtResult};
use std::str::FromStr;

/// The guardian deities in the game.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "with_serde", derive(Serialize, Deserialize))]
pub enum Guardian {
    Althyk,
    Azeyma,
    Byregot,
    Halone,
    Llymlaen,
    Menphina,
    NaldThal,
    Nophica,
    Nymeia,
    Oschon,
    Rhalgr,
    Thaliak,
}

impl Guardian {
    #[cfg(feature = "all_const")]
    pub const ALL: [Guardian; 12] = [
        Guardian::Althyk,
        Guardian::Azeyma,
        Guardian::Byregot,
        Guardian::Halone,
        Guardian::Llymlaen,
        Guardian::Menphina,
        Guardian::NaldThal,
        Guardian::Nophica,
        Guardian::Nymeia,
        Guardian::Oschon,
        Guardian::Rhalgr,
        Guardian::Thaliak,
    ];

    /// Returns the string variant of this world.
    pub fn as_str(&self) -> &'static str {
        match *self {
            Guardian::Althyk => "Althyk",
            Guardian::Azeyma => "Azeyma",
            Guardian::Byregot => "Byregot",
            Guardian::Halone => "Halone",
            Guardian::Llymlaen => "Llymlaen",
            Guardian::Menphina => "Menphina",
            Guardian::NaldThal => "NaldThal",
            Guardian::Nophica => "Nophica",
            Guardian::Nymeia => "Nymeia",
            Guardian::Oschon => "Oschon",
            Guardian::Rhalgr => "Rhalgr",
            Guardian::Thaliak => "Thaliak",
        }
    }

    pub fn name(&self) -> &'static str {
        match *self {
            Guardian::Althyk => "Althyk",
            Guardian::Azeyma => "Azeyma",
            Guardian::Byregot => "Byregot",
            Guardian::Halone => "Halone",
            Guardian::Llymlaen => "Llymlaen",
            Guardian::Menphina => "Menphina",
            Guardian::NaldThal => "Nald'thal",
            Guardian::Nophica => "Nophica",
            Guardian::Nymeia => "Nymeia",
            Guardian::Oschon => "Oschon",
            Guardian::Rhalgr => "Rhalgr",
            Guardian::Thaliak => "Thaliak",
        }
    }

    pub fn epithet(&self) -> &'static str {
        match *self {
            Guardian::Althyk => "the Keeper",
            Guardian::Azeyma => "the Warden",
            Guardian::Byregot => "the Builder",
            Guardian::Halone => "the Fury",
            Guardian::Llymlaen => "the Navigator",
            Guardian::Menphina => "the Lover",
            Guardian::NaldThal => "the Traders",
            Guardian::Nophica => "the Matron",
            Guardian::Nymeia => "the Spinner",
            Guardian::Oschon => "the Wanderer",
            Guardian::Rhalgr => "the Destroyer",
            Guardian::Thaliak => "the Scholar",
        }
    }
}

impl FromStr for Guardian {
    type Err = UnknownVariant;

    /// Parses a string `s` to return a value of this type.
    ///
    /// This is case-insensitive.
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let guardian = match s.to_lowercase().as_str() {
            "althyk" => Guardian::Althyk,
            "azeyma" => Guardian::Azeyma,
            "byregot" => Guardian::Byregot,
            "halone" => Guardian::Halone,
            "llymlaen" => Guardian::Llymlaen,
            "menphina" => Guardian::Menphina,
            "naldthal" | "nald'thal" => Guardian::NaldThal,
            "nophica" => Guardian::Nophica,
            "nymeia" => Guardian::Nymeia,
            "oschon" => Guardian::Oschon,
            "rhalgr" => Guardian::Rhalgr,
            "thaliak" => Guardian::Thaliak,
            _ => return Err(UnknownVariant("Guardian", s.into()))
        };

        Ok(guardian)
    }
}

impl Display for Guardian {
    fn fmt(&self, f: &mut Formatter) -> FmtResult {
        write!(f, "{}", self.name())
    }
}