skullball/rust/src/player/weapon.rs

use std::{collections::HashSet, f32::consts::PI};

use godot::{
    classes::{AudioStreamPlayer3D, GpuParticles3D},
    prelude::*,
};
use serde::{Deserialize, Serialize};

use crate::{
    game_manager::{Game, GameOption},
    net::util::{cast_ray, shotgun_ray},
    player::{DamageSource, IPlayer, ball::Ball, shootable::Shootable},
};

pub trait Weapon {
    fn shoot(
        &mut self,
        player_rid: Rid,
        player_id: u16,
        from: Vector3,
        to: Vector3,
        up: Vector3,
        deal_damage: bool,
    ) -> bool;
    fn get_type(&self) -> WeaponType;
}

#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, PartialOrd)]
pub enum WeaponType {
    Raygun,
    Shotgun,
    Ball,
}

#[derive(GodotClass)]
#[class(base=Node3D, init)]
pub struct Raygun {
    #[export]
    sound_emitter: Option<Gd<AudioStreamPlayer3D>>,
    #[export]
    bullet_prefab: Option<Gd<PackedScene>>,
    #[export]
    bullet_source: Option<Gd<Node3D>>,

    #[export]
    cooldown: f64,

    cooldown_remaining: f64,

    base: Base<Node3D>,
}

#[godot_api]
impl INode3D for Raygun {
    fn process(&mut self, delta: f64) {
        self.cooldown_remaining -= delta;
    }
}

#[godot_dyn]
impl Weapon for Raygun {
    fn shoot(
        &mut self,
        player: Rid,
        player_id: u16,
        from: Vector3,
        to: Vector3,
        _: Vector3,
        deal_damage: bool,
    ) -> bool {
        if self.cooldown_remaining > 0. {
            return false;
        }

        if let Some(emitter) = &mut self.sound_emitter {
            emitter.play();
        }

        if let Some(source) = &self.bullet_source {
            let target = cast_ray(
                from,
                to,
                &self.base().get_world_3d(),
                &Array::from_iter(vec![player]),
            );

            let dir = (to - source.get_global_position()).normalized();
            let beam_end = target
                .as_ref()
                .map(|r| r.position)
                .unwrap_or(source.get_global_position() + dir * 100.);

            if let Some(prefab) = &self.bullet_prefab {
                let mut bullet = prefab.instantiate_as::<Beam>();

                bullet.bind_mut().source = Some(source.get_global_position());
                bullet.bind_mut().target = Some(beam_end);

                self.run_deferred(move |_| {
                    if let Some(mut game) = Game::singleton()
                        && let Some(map) = &mut game.bind_mut().current_map
                    {
                        map.add_child(&bullet);
                    }
                });
            }

            if deal_damage && let Some(target) = target {
                if let Ok(mut shootable) = target.collider.clone().try_dynify::<dyn Shootable>() {
                    godot_print!("{}", target.collider);
                    self.run_deferred(move |_| {
                        shootable.dyn_bind_mut().on_shoot(
                            DamageSource::Player(player_id),
                            100,
                            dir.normalized(),
                        );
                    });
                }
            }
        }

        self.cooldown_remaining = self.cooldown;

        true
    }

    fn get_type(&self) -> WeaponType {
        WeaponType::Raygun
    }
}

#[derive(GodotClass)]
#[class(base=Node3D, init)]
pub struct Shotgun {
    #[export]
    sound_emitter: Option<Gd<AudioStreamPlayer3D>>,
    #[export]
    vfx: Option<Gd<GpuParticles3D>>,

    #[export]
    cooldown: f64,

    cooldown_remaining: f64,

    base: Base<Node3D>,
}

#[godot_api]
impl INode3D for Shotgun {
    fn process(&mut self, delta: f64) {
        self.cooldown_remaining -= delta;
    }
}

#[godot_dyn]
impl Weapon for Shotgun {
    fn shoot(
        &mut self,
        player: Rid,
        player_id: u16,
        from: Vector3,
        to: Vector3,
        up: Vector3,
        deal_damage: bool,
    ) -> bool {
        if self.cooldown_remaining > 0. {
            return false;
        }

        if let Some(audio) = &mut self.sound_emitter {
            audio.play();
        }
        if let Some(vfx) = &mut self.vfx {
            vfx.set_emitting(true);
        }

        let mut colliders = HashSet::new();

        for result in shotgun_ray(
            from,
            to,
            up,
            &self.base().get_world_3d(),
            &Array::from_iter(vec![player]),
            10,
            PI / 2.,
            10.,
        ) {
            colliders.insert(result.collider);
        }

        if deal_damage {
            for collider in colliders {
                let collider_pos = if let Ok(node) = collider.clone().try_cast::<Node3D>() {
                    node.get_global_position()
                } else {
                    Vector3::ZERO
                };
                let delta = collider_pos - from;

                if let Ok(mut shootable) = collider.clone().try_dynify::<dyn Shootable>() {
                    godot_print!("{} ({})", collider, delta.length());
                    self.run_deferred(move |_| {
                        shootable.dyn_bind_mut().on_shoot(
                            DamageSource::Player(player_id),
                            (500. / delta.length()) as i32,
                            delta.normalized(),
                        );
                    });
                }
            }
        }

        self.cooldown_remaining = self.cooldown;

        true
    }

    fn get_type(&self) -> WeaponType {
        WeaponType::Shotgun
    }
}

#[derive(GodotClass)]
#[class(base=Node3D, init)]
pub struct Beam {
    pub source: Option<Vector3>,
    pub target: Option<Vector3>,

    distance: f32,
    girth: f32,

    base: Base<Node3D>,
}

#[godot_api]
impl INode3D for Beam {
    fn ready(&mut self) {
        if let (Some(target), Some(source)) = (self.target, self.source) {
            let midway_point = (target + source) / 2.;
            self.distance = source.distance_to(target);
            self.girth = 1.;

            self.scale();
            self.base_mut().look_at_from_position(source, target);
            self.base_mut().set_global_position(midway_point);
        }
    }

    fn process(&mut self, _delta: f32) {
        self.girth = self.girth.lerp(0., 0.07);
        self.scale();
    }
}

impl Beam {
    fn scale(&mut self) {
        let length = Vector3::BACK * self.distance;
        let girth_scale = (Vector3::UP + Vector3::RIGHT) * self.girth;
        self.base_mut().set_scale(length + girth_scale);

        if self.girth < 0.01 {
            self.base_mut().queue_free();
        }
    }
}

#[derive(GodotClass)]
#[class(base=Node3D, init)]
pub struct BallWeapon {
    base: Base<Node3D>,
}

#[godot_dyn]
impl Weapon for BallWeapon {
    fn shoot(&mut self, _: Rid, _: u16, _: Vector3, _: Vector3, _: Vector3, _: bool) -> bool {
        true
    }

    fn get_type(&self) -> WeaponType {
        WeaponType::Ball
    }
}