display buffs in the client

src/entity.js

@@ -153,14 +153,17 @@ export default class Entity {
     )
   }
 
-  applyBuff(id) {
+  applyBuff(id, sourceId = null) {
     const index = this.buffs.findIndex((it) => it.id == id)
+    const source = sourceId ?? this.id
     const timestamp = this.game?.currentTick ?? 0
+
     if (index > -1) {
       this.buffs[index].timestamp = timestamp
+      this.buffs[index].source = source
     }
     else {
-      this.buffs.push({ id, timestamp })
+      this.buffs.push({ id, source, timestamp })
     }
   }
 
@@ -191,11 +194,14 @@ export default class Entity {
       .reduce((e1, e2) => (e1?.distanceTo(cursor) ?? Infinity) < e2.distanceTo(cursor) ? e1 : e2, null)
   }
 
-  damage(amount) {
+  damage(amount, source = null) {
     let damage = amount
     if (this.hasBuff(Buff.exposed.id)) {
-      damage *= 3 // TODO: move to buff, make generic
-      this.removeBuff(Buff.exposed.id)
+      const buff = this.getBuff(Buff.exposed.id)
+      if (buff.source == source.id) {
+        damage *= 3 // TODO: move to Buff class to make generic
+        this.removeBuff(Buff.exposed.id)
+      }
     }
 
     this.health = Math.min(Math.max(0, this.health - damage), this.maxHealth)
@@ -209,6 +215,16 @@ export default class Entity {
     return this.position.distanceTo(cursor)
   }
 
+  getBuff(id) {
+    const entityBuff = this.buffs.find((it) => it.id == id)
+    if (entityBuff == null) { return }
+
+    const buffDefinition = this.game?.buffs.find((it) => it.id == entityBuff.id)
+    if (buffDefinition == null) { return }
+
+    return { ...buffDefinition, ...entityBuff }
+  }
+
   hasBuff(id) {
     return this.buffs.some((it) => it.id == id)
   }
@@ -405,13 +421,8 @@ export default class Entity {
   }
 
   #tickBuff(index) {
-    const entityBuff = this.buffs[index]
-    if (entityBuff == null) { return }
-
-    const buffDefinition = this.game?.buffs.find((it) => it.id == entityBuff.id)
-    if (buffDefinition == null) { return }
-
-    const buff = { ...buffDefinition, ...entityBuff }
+    if (this.buffs[index] == null) { return }
+    const buff = this.getBuff(this.buffs[index].id)
     const duration = this.game?.secToTick(buff.duration) ?? 0
     const currentTick = this.game?.currentTick ?? 0