//! This module contains some low-level game data, such as different boss IDs.
use std::{fmt, str::FromStr};
use num_derive::FromPrimitive;

/// Enum containing all bosses with their IDs.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, FromPrimitive)]
pub enum Boss {
    // Wing 1
    ValeGuardian = 0x3C4E,
    Gorseval = 0x3C45,
    Sabetha = 0x3C0F,

    // Wing 2
    Slothasor = 0x3EFB,
    Matthias = 0x3EF3,

    // Wing 3
    KeepConstruct = 0x3F6B,
    /// Xera ID for phase 1.
    ///
    /// This is only half of Xera's ID, as there will be a second agent for the
    /// second phase. This agent will have another ID, see
    /// [`XERA_PHASE2_ID`](constant.XERA_PHASE2_ID.html).
    Xera = 0x3F76,

    // Wing 4
    Cairn = 0x432A,
    MursaatOverseer = 0x4314,
    Samarog = 0x4324,
    Deimos = 0x4302,

    // Wing 5
    SoullessHorror = 0x4D37,
    Dhuum = 0x4BFA,

    // Wing 6
    ConjuredAmalgamate = 0xABC6,
    LargosTwins = 0x5271,
    Qadim = 0x51C6,

    // Wing 7
    CardinalAdina = 0x55F6,
    CardinalSabir = 0x55CC,
    QadimThePeerless = 0x55F0,

    // 100 CM
    Skorvald = 0x44E0,
    Artsariiv = 0x461D,
    Arkk = 0x455F,

    // 99 CM
    MAMA = 0x427D,
    Siax = 0x4284,
    Ensolyss = 0x4234,

    // Strike missions
    IcebroodConstruct = 0x568A,
    VoiceOfTheFallen = 0x5747,
    FraenirOfJormag = 0x57DC,
    Boneskinner = 0x57F9,
    WhisperOfJormag = 0x58B7,
}


/// Error for when converting a string to the boss fails.
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct ParseBossError(String);


impl fmt::Display for ParseBossError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Invalid boss identifier: {}", self.0)
    }
}


impl FromStr for Boss {
    type Err = ParseBossError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let lower = s.to_lowercase();
        match &lower as &str {
            "vg" | "vale guardian" => Ok(Boss::ValeGuardian),
            "gorse" | "gorseval" => Ok(Boss::Gorseval),
            "sab" | "sabetha" => Ok(Boss::Sabetha),

            "sloth" | "slothasor" => Ok(Boss::Slothasor),
            "matthias" => Ok(Boss::Matthias),

            "kc" | "keep construct" => Ok(Boss::KeepConstruct),
            "xera" => Ok(Boss::Xera),

            "cairn" => Ok(Boss::Cairn),
            "mo" | "mursaat overseer" => Ok(Boss::MursaatOverseer),
            "sam" | "sama" | "samarog" => Ok(Boss::Samarog),
            "deimos" => Ok(Boss::Deimos),

            "desmina" | "sh" => Ok(Boss::SoullessHorror),
            "dhuum" => Ok(Boss::Dhuum),

            "ca" | "conjured almagamate" => Ok(Boss::ConjuredAmalgamate),
            "largos" | "twins" => Ok(Boss::LargosTwins),
            "qadim" => Ok(Boss::Qadim),

            "adina" | "cardinal adina" => Ok(Boss::CardinalAdina),
            "sabir" | "cardinal sabir" => Ok(Boss::CardinalSabir),
            "qadimp" | "peerless qadim" | "qadim the peerless" => Ok(Boss::QadimThePeerless),

            "skorvald" => Ok(Boss::Skorvald),
            "artsariiv" => Ok(Boss::Artsariiv),
            "arkk" => Ok(Boss::Arkk),

            "mama" => Ok(Boss::MAMA),
            "siax" => Ok(Boss::Siax),
            "ensolyss" => Ok(Boss::Ensolyss),

            "icebrood" | "icebrood construct" => Ok(Boss::IcebroodConstruct),
            "super kodan brothers" => Ok(Boss::VoiceOfTheFallen),
            "fraenir" | "fraenir of jormag" => Ok(Boss::FraenirOfJormag),
            "boneskinner" => Ok(Boss::Boneskinner),
            "whisper" | "whisper of jormag" => Ok(Boss::WhisperOfJormag),

            _ => Err(ParseBossError(s.to_owned()))
        }
    }
}


/// ID for Xera in the second phase.
///
/// The original Xera will despawn, and after the tower phase, a separate spawn
/// will take over. This new Xera will have this ID. Care needs to be taken when
/// calculating boss damage on this encounter, as both Xeras have to be taken
/// into account.
pub const XERA_PHASE2_ID: u16 = 0x3F9E;


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

    #[test]
    pub fn test_parsing() {
        assert_eq!("vg".parse(), Ok(Boss::ValeGuardian));
        assert_eq!("VG".parse(), Ok(Boss::ValeGuardian));

        assert!("vga".parse::<Boss>().is_err());
    }
}