Miku: add ability to permanently charm angels with the Microphone item

Author: vulpya

TODO.md

@@ -11,17 +11,22 @@
 
 ## TODO: Miku
 
-- [ ] Balance Stats & charming chances + birthright fan chances.
+- [x] Balance Stats & charming chances + birthright fan chances.
 - [ ] Add item synergies.
-  - [ ] Hopefully add Miku Leek synergy with Mom's Knife or Spirit Sword
-- [ ] Maybe add charm blacklist, instead of just skipping over all bosses.
-- [ ] Maybe add charmable Angels.
+  - [ ] Maybe add Miku Leek synergy with Mom's Knife and/or Spirit Sword
+- [ ] Add charm blacklist, instead of just skipping over all bosses.
+- [x] Maybe add charmable Angels.
+  - [x] Angels can now be charmed with the 'Microphone' active item.
 
 ## TODO: Tainted Miku
 
 - [ ] Balance Stats and note drop rates.
 - [ ] Add more unique notes and balance them correctly.
-- [ ] Add item synergies tied to special and unique note types.
+- [x] Add item synergies tied to special and unique note types.
+  - [x] Add Brimstone Synergy
+  - [x] Add Dr. Fetus Synergy
   - [ ] TODO: Synergy ideas.
+- [x] Fix fire rate multiplier issues with several items.
+  - [x] Fix Monstro's Lung.
 - [ ] Add Birthright for Tainted Miku.
 - [ ] Add Tainted Miku Icons & Controls.

src/items/MicrophoneItem/MicrophoneItem.ts

@@ -1,10 +1,11 @@
-import type {
-  ActiveSlot,
+import type { ActiveSlot, UseFlag } from "isaac-typescript-definitions";
+import {
   CollectibleType,
-  UseFlag,
+  EntityType,
+  ModCallback,
+  RoomType,
 } from "isaac-typescript-definitions";
-import { ModCallback } from "isaac-typescript-definitions";
-import { Callback } from "isaacscript-common";
+import { Callback, spawnCollectible } from "isaacscript-common";
 import type { EIDExtended } from "../../compat/EID";
 import { Debugger } from "../../util/debug";
 import { charmEnemy, getEnemies, isCharmable } from "../../util/enemies";
@@ -31,20 +32,47 @@ export class MicrophoneItem extends ActiveItem {
   override onPostUseItem(
     _collectibleType: CollectibleType,
     _rng: RNG,
-    _player: EntityPlayer,
+    player: EntityPlayer,
     _flags: BitFlags<UseFlag>,
     _slot: ActiveSlot,
     _data: int,
   ): UseItemResult {
-    const enemies = getEnemies().filter(isCharmable);
+    const enemies = getEnemies();
+
+    const room = Game().GetRoom();
+    const inAngelRoom = room.GetType() === RoomType.ANGEL;
 
-    let count = 0;
     for (const enemy of enemies) {
-      charmEnemy(enemy, 0, true);
-      count++;
-    }
+      if (inAngelRoom) {
+        if (enemy.Type === EntityType.URIEL) {
+          if (!player.HasCollectible(CollectibleType.KEY_PIECE_1)) {
+            spawnCollectible(
+              CollectibleType.KEY_PIECE_1,
+              room.FindFreePickupSpawnPosition(enemy.Position),
+              player.GetDropRNG(),
+            );
+          }
+          charmEnemy(enemy, 0, true, true);
+          continue;
+        }
 
-    Debugger.item(NAME, `Turned ${count} enemies into fans.`);
+        if (enemy.Type === EntityType.GABRIEL) {
+          if (!player.HasCollectible(CollectibleType.KEY_PIECE_2)) {
+            spawnCollectible(
+              CollectibleType.KEY_PIECE_2,
+              room.FindFreePickupSpawnPosition(enemy.Position),
+              player.GetDropRNG(),
+            );
+          }
+          charmEnemy(enemy, 0, true, true);
+          continue;
+        }
+      }
+
+      if (isCharmable(enemy)) {
+        charmEnemy(enemy, 0, true);
+      }
+    }
 
     return {
       Discharge: true,

src/util/enemies.ts

@@ -41,10 +41,11 @@ export const charmEnemy = (
   entity: Entity,
   seconds: float,
   permanent = false,
+  bosses = false,
 ): boolean => {
   entity.AddCharmed(
     EntityRef(entity),
-    permanent && !entity.IsBoss() ? -1 : getFrames(seconds),
+    permanent && (bosses || !entity.IsBoss()) ? -1 : getFrames(seconds),
   );
   return true;
 };