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

/// 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" | "soulless horror" => Ok(Boss::SoullessHorror),
            "dhuum" => Ok(Boss::Dhuum),

            "ca" | "conjured amalgamate" => Ok(Boss::ConjuredAmalgamate),
            "largos" | "twins" | "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" | "ensolyss of the endless torment" => Ok(Boss::Ensolyss),

            "icebrood" | "icebrood construct" => Ok(Boss::IcebroodConstruct),
            "kodans" | "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]
    fn test_boss_parsing_ok() {
        use Boss::*;
        let tests: &[(&'static str, Boss)] = &[
            ("vg", ValeGuardian),
            ("VG", ValeGuardian),
            ("vale guardian", ValeGuardian),
            ("Vale Guardian", ValeGuardian),
            ("gorse", Gorseval),
            ("Gorse", Gorseval),
            ("gorseval", Gorseval),
            ("Gorseval", Gorseval),
            ("sab", Sabetha),
            ("sabetha", Sabetha),
            ("Sabetha", Sabetha),
            ("sloth", Slothasor),
            ("slothasor", Slothasor),
            ("Slothasor", Slothasor),
            ("matthias", Matthias),
            ("Matthias", Matthias),
            ("kc", KeepConstruct),
            ("KC", KeepConstruct),
            ("keep construct", KeepConstruct),
            ("Keep Construct", KeepConstruct),
            ("xera", Xera),
            ("Xera", Xera),
            ("cairn", Cairn),
            ("Cairn", Cairn),
            ("mo", MursaatOverseer),
            ("MO", MursaatOverseer),
            ("mursaat overseer", MursaatOverseer),
            ("Mursaat Overseer", MursaatOverseer),
            ("samarog", Samarog),
            ("Samarog", Samarog),
            ("deimos", Deimos),
            ("Deimos", Deimos),
            ("sh", SoullessHorror),
            ("soulless horror", SoullessHorror),
            ("desmina", SoullessHorror),
            ("Desmina", SoullessHorror),
            ("dhuum", Dhuum),
            ("Dhuum", Dhuum),
            ("ca", ConjuredAmalgamate),
            ("conjured amalgamate", ConjuredAmalgamate),
            ("Conjured Amalgamate", ConjuredAmalgamate),
            ("largos", LargosTwins),
            ("twins", LargosTwins),
            ("largos twins", LargosTwins),
            ("qadim", Qadim),
            ("Qadim", Qadim),
            ("adina", CardinalAdina),
            ("cardinal adina", CardinalAdina),
            ("Cardinal Adina", CardinalAdina),
            ("sabir", CardinalSabir),
            ("cardinal sabir", CardinalSabir),
            ("Cardinal Sabir", CardinalSabir),
            ("qadimp", QadimThePeerless),
            ("qadim the peerless", QadimThePeerless),
            ("Qadim The Peerless", QadimThePeerless),
            ("skorvald", Skorvald),
            ("Skorvald", Skorvald),
            ("artsariiv", Artsariiv),
            ("Artsariiv", Artsariiv),
            ("arkk", Arkk),
            ("Arkk", Arkk),
            ("mama", MAMA),
            ("MAMA", MAMA),
            ("siax", Siax),
            ("SIAX", Siax),
            ("ensolyss", Ensolyss),
            ("Ensolyss", Ensolyss),
            ("Ensolyss of the Endless Torment", Ensolyss),
            ("icebrood", IcebroodConstruct),
            ("Icebrood Construct", IcebroodConstruct),
            ("fraenir", FraenirOfJormag),
            ("Fraenir of Jormag", FraenirOfJormag),
            ("boneskinner", Boneskinner),
            ("kodans", VoiceOfTheFallen),
            ("whisper", WhisperOfJormag),
            ("Whisper of Jormag", WhisperOfJormag),
        ];

        for (input, expected) in tests {
            assert_eq!(input.parse(), Ok(*expected));
        }
    }

    #[test]
    fn test_boss_parsing_err() {
        let tests = &[
            "",
            "vga",
            "VGA",
            "foovg",
            "valeguardian",
            "ValeGuardian",
            "slotha",
            "slot",
            "slothasora",
            "cardinal",
        ];
        for test in tests {
            assert!(test.parse::<Boss>().is_err());
        }
    }
}