werewolves/werewolves-proto/src/aura.rs

use core::fmt::Display;

// Copyright (C) 2025 Emilis Bliūdžius
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
use serde::{Deserialize, Serialize};
use werewolves_macros::ChecksAs;

use crate::{
    game::{GameTime, Village},
    role::{Alignment, Killer, Powerful},
    team::Team,
};
const BLOODLET_DURATION_DAYS: u8 = 2;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, ChecksAs)]
pub enum Aura {
    Traitor,
    #[checks("cleansible")]
    Drunk,
    Insane,
    #[checks("cleansible")]
    Bloodlet {
        night: u8,
    },
}

impl Display for Aura {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(match self {
            Aura::Traitor => "Traitor",
            Aura::Drunk => "Drunk",
            Aura::Insane => "Insane",
            Aura::Bloodlet { .. } => "Bloodlet",
        })
    }
}

impl Aura {
    pub const fn expired(&self, village: &Village) -> bool {
        match self {
            Aura::Traitor | Aura::Drunk | Aura::Insane => false,
            Aura::Bloodlet {
                night: applied_night,
            } => match village.time() {
                GameTime::Day { .. } => false,
                GameTime::Night {
                    number: current_night,
                } => current_night >= applied_night.saturating_add(BLOODLET_DURATION_DAYS),
            },
        }
    }

    pub const fn refreshes(&self, other: &Aura) -> bool {
        matches!(
            (self, other),
            (Aura::Bloodlet { .. }, Aura::Bloodlet { .. })
        )
    }

    pub fn refresh(&mut self, other: Aura) {
        if let (Aura::Bloodlet { night }, Aura::Bloodlet { night: new_night }) = (self, other) {
            *night = new_night
        }
    }
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct Auras(Vec<Aura>);

impl Auras {
    pub const fn new(auras: Vec<Aura>) -> Self {
        Self(auras)
    }

    pub fn list(&self) -> &[Aura] {
        &self.0
    }

    pub fn remove_aura(&mut self, aura: Aura) {
        self.0.retain(|a| *a != aura);
    }

    /// purges expired [Aura]s and returns the ones that were removed
    pub fn purge_expired(&mut self, village: &Village) -> Box<[Aura]> {
        let mut auras = Vec::with_capacity(self.0.len());
        core::mem::swap(&mut self.0, &mut auras);
        let (expired, retained): (Vec<_>, Vec<_>) =
            auras.into_iter().partition(|aura| aura.expired(village));

        self.0 = retained;
        expired.into_boxed_slice()
    }

    pub fn add(&mut self, aura: Aura) {
        if let Some(existing) = self.0.iter_mut().find(|aura| aura.refreshes(aura)) {
            existing.refresh(aura);
        } else {
            self.0.push(aura);
        }
    }

    pub fn cleanse(&mut self) {
        self.0.retain(|aura| !aura.cleansible());
    }

    /// returns [Some] if the auras override the player's [Team]
    pub fn overrides_team(&self) -> Option<Team> {
        if self.0.iter().any(|a| matches!(a, Aura::Traitor)) {
            return Some(Team::AnyEvil);
        }
        None
    }

    /// returns [Some] if the auras override the player's [Alignment]
    pub fn overrides_alignment(&self) -> Option<Alignment> {
        for aura in self.0.iter() {
            match aura {
                Aura::Traitor => return Some(Alignment::Traitor),
                Aura::Bloodlet { .. } => return Some(Alignment::Wolves),
                Aura::Drunk | Aura::Insane => {}
            }
        }
        None
    }

    /// returns [Some] if the auras override whether the player is a [Killer]
    pub fn overrides_killer(&self) -> Option<Killer> {
        self.0
            .iter()
            .any(|a| matches!(a, Aura::Bloodlet { .. }))
            .then_some(Killer::Killer)
    }

    /// returns [Some] if the auras override whether the player is [Powerful]
    pub fn overrides_powerful(&self) -> Option<Powerful> {
        self.0
            .iter()
            .any(|a| matches!(a, Aura::Bloodlet { .. }))
            .then_some(Powerful::Powerful)
    }
}