From 7a3349c773a9994dcadc3b08dbfacbcfecae6d64 Mon Sep 17 00:00:00 2001
From: kjirou <kjirou.web@gmail.com>
Date: Sun, 22 Sep 2024 18:15:06 +0900
Subject: [PATCH] wip

---
 src/lesson-mutation.test.ts | 35 +++++++++++++++++++++++++++++++++++
 src/lesson-mutation.ts      | 24 ++++++++++++++++++++++++
 src/types.ts                |  2 ++
 3 files changed, 61 insertions(+)

diff --git a/src/lesson-mutation.test.ts b/src/lesson-mutation.test.ts
index 0154501..63555e5 100644
--- a/src/lesson-mutation.test.ts
+++ b/src/lesson-mutation.test.ts
@@ -76,6 +76,41 @@ describe("activateEffectIf", () => {
         },
       ],
     },
+    {
+      name: "drainModifier - motivation - 現在値より減少値が高い時、0になるまで減らす",
+      args: [
+        (() => {
+          const lesson = createLessonForTest();
+          lesson.idol.modifiers = [{ kind: "motivation", amount: 2, id: "m1" }];
+          return lesson;
+        })(),
+        { kind: "drainModifier", modifierKind: "motivation", value: 5 },
+        () => 0,
+        createIdGenerator(),
+      ],
+      expected: [
+        {
+          kind: "modifiers.update",
+          propertyNameKind: "amount",
+          id: "m1",
+          actual: -2,
+          max: -5,
+        },
+      ],
+    },
+    {
+      name: "drainModifier - motivation - 現在値が0の時、何もしない",
+      args: [
+        (() => {
+          const lesson = createLessonForTest();
+          return lesson;
+        })(),
+        { kind: "drainModifier", modifierKind: "motivation", value: 1 },
+        () => 0,
+        createIdGenerator(),
+      ],
+      expected: [],
+    },
     {
       name: "generateCard - 手札0枚で実行した時、強化されたSSRのスキルカードを追加して、手札はその1枚になる",
       args: [
diff --git a/src/lesson-mutation.ts b/src/lesson-mutation.ts
index 509fad0..084a330 100644
--- a/src/lesson-mutation.ts
+++ b/src/lesson-mutation.ts
@@ -844,6 +844,30 @@ export const activateEffect = <
       ];
       break;
     }
+    case "drainModifier": {
+      switch (effect.modifierKind) {
+        case "motivation": {
+          const motivation = lesson.idol.modifiers.find(
+            (e) => e.kind === "motivation",
+          );
+          if (motivation) {
+            diffs.push({
+              kind: "modifiers.update",
+              propertyNameKind: "amount",
+              id: motivation.id,
+              actual: Math.max(-effect.value, -motivation.amount) + 0,
+              max: -effect.value + 0,
+            });
+          }
+          break;
+        }
+        default: {
+          const unreachable: never = effect;
+          throw new Error(`Unreachable statement`);
+        }
+      }
+      break;
+    }
     case "drawCards": {
       const { deck, discardPile, drawnCards } = drawCardsFromDeck(
         lesson.deck,
diff --git a/src/types.ts b/src/types.ts
index 09498a1..db43a4e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -616,6 +616,8 @@ export type EffectWithoutCondition = Readonly<
        * - 原文の構文は、「{modifierKind}減少{value}」
        *   - 「スタイリッシュモード」は、「やる気減少1」
        * - 現状はスキルカードには存在しない効果
+       * - 減少する値が不足している場合は、0になるまで減少する
+       *   - 本家仕様は未調査
        */
       kind: "drainModifier";
       modifierKind: "motivation";