veloren/common/src/sys/combat.rs

use crate::{
    comp::{
        ActionState::*, CharacterState, Controller, HealthChange, HealthSource, Item, ItemKind,
        Ori, Pos, Stats,
    },
    event::{EventBus, LocalEvent, ServerEvent},
    state::{DeltaTime, Uid},
};
use specs::{Entities, Join, Read, ReadStorage, System, WriteStorage};
use std::time::Duration;
use vek::*;

const BLOCK_EFFICIENCY: f32 = 0.9;

const ATTACK_RANGE: f32 = 4.0;
const BLOCK_ANGLE: f32 = 180.0;

/// This system is responsible for handling accepted inputs like moving or attacking
pub struct Sys;
impl<'a> System<'a> for Sys {
    type SystemData = (
        Entities<'a>,
        Read<'a, EventBus<ServerEvent>>,
        Read<'a, EventBus<LocalEvent>>,
        Read<'a, DeltaTime>,
        ReadStorage<'a, Uid>,
        ReadStorage<'a, Pos>,
        ReadStorage<'a, Ori>,
        ReadStorage<'a, Controller>,
        WriteStorage<'a, CharacterState>,
        WriteStorage<'a, Stats>,
    );

    fn run(
        &mut self,
        (
            entities,
            server_bus,
            local_bus,
            dt,
            uids,
            positions,
            orientations,
            controllers,
            mut character_states,
            stats,
        ): Self::SystemData,
    ) {
        // let mut server_emitter = server_bus.emitter();
        // let mut _local_emitter = local_bus.emitter();

        // // Attacks
        // for (entity, uid, pos, ori, _, stat) in (
        //     &entities,
        //     &uids,
        //     &positions,
        //     &orientations,
        //     &controllers,
        //     &stats,
        // )
        //     .join()
        // {
        //     let recover_duration = if let Some(Item {
        //         kind: ItemKind::Tool { kind, .. },
        //         ..
        //     }) = stat.equipment.main
        //     {
        //         kind.attack_recover_duration()
        //     } else {
        //         Duration::from_secs(1)
        //     };

        //     let (deal_damage, should_end) = if let Some(Attack { time_left, applied }) =
        //         &mut character_states.get_mut(entity).map(|c| &mut c.action)
        //     {
        //         *time_left = time_left
        //             .checked_sub(Duration::from_secs_f32(dt.0))
        //             .unwrap_or_default();
        //         if !*applied && recover_duration > *time_left {
        //             *applied = true;
        //             (true, false)
        //         } else if *time_left == Duration::default() {
        //             (false, true)
        //         } else {
        //             (false, false)
        //         }
        //     } else {
        //         (false, false)
        //     };

        //     if deal_damage {
        //         if let Some(Attack { .. }) = &character_states.get(entity).map(|c| c.action) {
        //             // Go through all other entities
        //             for (b, uid_b, pos_b, ori_b, character_b, stat_b) in (
        //                 &entities,
        //                 &uids,
        //                 &positions,
        //                 &orientations,
        //                 &character_states,
        //                 &stats,
        //             )
        //                 .join()
        //             {
        //                 // 2D versions
        //                 let pos2 = Vec2::from(pos.0);
        //                 let pos_b2: Vec2<f32> = Vec2::from(pos_b.0);
        //                 let ori2 = Vec2::from(ori.0);

        //                 // Check if it is a hit
        //                 if entity != b
        //                     && !stat_b.is_dead
        //                     && pos.0.distance_squared(pos_b.0) < ATTACK_RANGE.powi(2)
        //                     // TODO: Use size instead of 1.0
        //                     && ori2.angle_between(pos_b2 - pos2) < (2.0 / pos2.distance(pos_b2)).atan()
        //                 {
        //                     // Weapon gives base damage
        //                     let mut dmg = if let Some(ItemKind::Tool { power, .. }) =
        //                         stat.equipment.main.as_ref().map(|i| &i.kind)
        //                     {
        //                         *power as i32
        //                     } else {
        //                         1
        //                     };

        //                     // Block
        //                     if character_b.action.is_block()
        //                         && ori_b.0.angle_between(pos.0 - pos_b.0).to_degrees()
        //                             < BLOCK_ANGLE / 2.0
        //                     {
        //                         dmg = (dmg as f32 * (1.0 - BLOCK_EFFICIENCY)) as i32
        //                     }

        //                     server_emitter.emit(ServerEvent::Damage {
        //                         uid: *uid_b,
        //                         change: HealthChange {
        //                             amount: -dmg,
        //                             cause: HealthSource::Attack { by: *uid },
        //                         },
        //                     });
        //                 }
        //             }
        //         }
        //     }

        //     if should_end {
        //         if let Some(character) = &mut character_states.get_mut(entity) {
        //             character.action = Wield {
        //                 time_left: Duration::default(),
        //             };
        //         }
        //     }

        //     if let Some(Wield { time_left }) =
        //         &mut character_states.get_mut(entity).map(|c| &mut c.action)
        //     {
        //         if *time_left != Duration::default() {
        //             *time_left = time_left
        //                 .checked_sub(Duration::from_secs_f32(dt.0))
        //                 .unwrap_or_default();
        //         }
        //     }
        // }
    }
}