1 files changed, 64 insertions, 0 deletions
diff --git a/src/shared/area_of_effect.rs b/src/shared/area_of_effect.rs
new file mode 100644
index 0000000..dcdc86c
--- /dev/null
+++ b/src/shared/area_of_effect.rs
@@ -0,0 +1,64 @@
+use crate::server::entity_map::*;
+use crate::shared::buffs::*;
+use crate::shared::player::*;
+use crate::shared::*;
+use bevy::ecs::system::*;
+
+#[derive(Bundle)]
+pub struct AreaOfEffectBundle {
+    area_of_effect: AreaOfEffect,
+    replicate: Replicate,
+}
+
+impl AreaOfEffectBundle {
+    pub fn new(area_of_effect: AreaOfEffect) -> Self {
+        AreaOfEffectBundle {
+            area_of_effect,
+            replicate: Replicate::default(),
+        }
+    }
+}
+
+#[derive(Component, Message, Serialize, Deserialize, Clone, PartialEq, Debug)]
+pub struct AreaOfEffect {
+    pub position: Vec2,
+    pub radius: f32,
+    // `duration = None` means `AreaOfEffect` exists only for a single server tick
+    pub duration: Option<f32>,
+    pub source_player: PlayerId,
+    pub area_of_effect_type: AreaOfEffectType,
+}
+
+#[derive(Component, Message, Serialize, Deserialize, Clone, PartialEq, Debug)]
+pub enum AreaOfEffectType {
+    Slow,
+}
+
+pub type AreaOfEffectActivation = Box<dyn FnOnce(&mut Commands, PlayerId, PlayerId) -> ()>;
+
+impl AreaOfEffect {
+    pub fn activate(&self) -> AreaOfEffectActivation {
+        match self.area_of_effect_type {
+            AreaOfEffectType::Slow => Box::new(
+                move |commands: &mut Commands,
+                      _source_player_id: PlayerId,
+                      target_player_id: PlayerId| {
+                    commands.add(move |world: &mut World| {
+                        world.run_system_once(
+                            move |entity_map: Res<EntityMap>, mut buffs: Query<&mut Buffs>| {
+                                let Some(target_entity) = entity_map.0.get(&target_player_id.0)
+                                else {
+                                    return;
+                                };
+                                let Ok(mut buffs) = buffs.get_mut(*target_entity) else {
+                                    return;
+                                };
+                                buffs.slow = Some(0.75);
+                            },
+                        )
+                    })
+                },
+            ),
+        }
+    }
+}