From 0c7a562b00cb827a1e36f3665bc9f4767425eec4 Mon Sep 17 00:00:00 2001
From: artbiit <artbiit@naver.com>
Date: Mon, 30 Mar 2026 17:30:29 +0900
Subject: [PATCH] feat: update weapon refinement cost formula and add
 durability and destruction mechanics

---
 Docs/Plans/MiniGame_Refinement_Plan.md | 10 +++++++---
 src/services/RefinementService.ts      |  7 ++++---
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/Docs/Plans/MiniGame_Refinement_Plan.md b/Docs/Plans/MiniGame_Refinement_Plan.md
index 8efef6f..a5e01df 100644
--- a/Docs/Plans/MiniGame_Refinement_Plan.md
+++ b/Docs/Plans/MiniGame_Refinement_Plan.md
@@ -8,9 +8,13 @@ The Refinement mini-game allows users to strengthen their virtual weapons, parti
 ## Core Features
 
 ### 1. Weapon Refinement
-- **Progression**: Level 0 to Level 20.
-- **Cost**: Increases exponentially with level (`level^2 * 100 G`).
-- **Success Rate**: Decreases as the level increases.
+- **Progression**: Level- **재련 비용**: `floor(10 × 1.6^level)G` (레벨별 기하급수적 증가)
+- **판매 가격**: `floor(현재_단계_비용 × 2)G`
+- **내구도**: 전투 참여 시(공격/방어 모두) 내구도 -1.
+- **파괴 조건**:
+    - 재련 실패 시 낮은 확률로 파괴 (0단계 회귀).
+    - 내구도가 0인 상태에서 전투 시도(공격) 시 전투 후 무기 파괴.
+as the level increases.
 - **Risk**: Failure at higher levels can lead to weapon destruction (reset to level 0).
 - **Durability**: Each battle reduces durability. **Success and Level Up fully restores durability.**
 
diff --git a/src/services/RefinementService.ts b/src/services/RefinementService.ts
index a8dc1fa..ed60e2c 100644
--- a/src/services/RefinementService.ts
+++ b/src/services/RefinementService.ts
@@ -39,8 +39,8 @@ export class RefinementService {
       throw new Error(`이미 최대 단계(${this.MAX_LEVEL}강)에 도달했습니다. 무기를 판매하고 다시 시작하세요!`);
     }
 
-    // 비용 계산: level^2 * 100G
-    const cost = Math.pow(profile.weaponLevel, 2) * 100 || 100;
+    // 비용 계산: floor(10 * 1.6^level)
+    const cost = Math.floor(10 * Math.pow(1.6, profile.weaponLevel));
 
     if (profile.gold < cost) {
       throw new Error('골드가 부족합니다.');
@@ -206,7 +206,8 @@ export class RefinementService {
     const profile = await this.getOrCreateProfile(userId, guildId);
     if (profile.weaponLevel === 0) throw new Error('0단계 무기는 판매할 수 없습니다.');
 
-    const price = Math.pow(profile.weaponLevel, 2) * 150;
+    const currentCost = Math.floor(10 * Math.pow(1.6, profile.weaponLevel));
+    const price = Math.floor(currentCost * 2);
     
     const updated = await prisma.refinementProfile.update({
       where: { userId_guildId: { userId, guildId } },