Attack system revamp (#82)

- Add crouch cancelling
- Add IASA for aerial attacks
- Add scaffolding for autocancel
- Add hitbox group system
- Add new ergonomic features for attack scripting
- Add more information to the hitbox viewer
- Improve the looks of debug capsules

Reviewed-on: #82
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/scripting/mod.rs

@@ -1,6 +1,5 @@
 use bevy::prelude::*;
 use serde::{Deserialize, Serialize};
-use std::collections::HashSet;
 
 use crate::{fighter::attack::AttackHitbox, math::int::FGi32};
 
@@ -15,22 +14,37 @@ pub enum MoveAngleKind {
 #[derive(Asset, Reflect, Serialize, Deserialize)]
 pub struct FighterAttackScript {
     pub hitboxes: Vec<AttackHitbox>,
-    pub iasa_frame: u32,
-    pub wont_autocancel_window: (u32, u32),
+    pub iasa_frame: Option<u32>,
+    pub wont_autocancel_window: Option<(u32, u32)>,
+    pub landing_duration: Option<u32>,
 }
 
 impl FighterAttackScript {
     pub fn validate(&self) -> Result<(), String> {
-        let mut ids = HashSet::with_capacity(self.hitboxes.len());
         for hitbox in &self.hitboxes {
             hitbox.validate()?;
-            if !ids.insert(hitbox.id) {
-                return Err(format!("duplicate hitbox id {}", hitbox.id));
+        }
+        for (index, left) in self.hitboxes.iter().enumerate() {
+            for right in self.hitboxes.iter().skip(index + 1) {
+                if left.id == right.id
+                    && left.start_frame < right.end_frame
+                    && right.start_frame < left.end_frame
+                {
+                    return Err(format!(
+                        "hitbox id {} has overlapping intervals {}..{} and {}..{}",
+                        left.id, left.start_frame, left.end_frame, right.start_frame,
+                        right.end_frame
+                    ));
+                }
             }
         }
-        if self.wont_autocancel_window.0 > self.wont_autocancel_window.1 {
-            return Err("autocancel window end precedes its start".into());
+        
+        if let Some(wont_autocancel_window) = self.wont_autocancel_window {
+            if wont_autocancel_window.0 > wont_autocancel_window.1 {
+                return Err("autocancel window end precedes its start".into());
+            }
         }
+
         Ok(())
     }
 }