From 3c128c4f9c4ea9d03bc07530b12c39c627c265bb Mon Sep 17 00:00:00 2001
From: HoyiTT <pjs9177@naver.com>
Date: Sat, 28 Jun 2025 14:48:59 +0900
Subject: [PATCH] =?UTF-8?q?[feat]=20#29=20=EC=A0=9C=EB=AF=B8=EB=82=98?=
 =?UTF-8?q?=EC=9D=B4=20=EA=B7=B8=EB=9D=BC=EC=9A=B4=EB=94=A9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 build.gradle                                  |  2 +
 .../kernellabs/application/GeminiService.java | 46 +++++++++++++++++++
 .../controller/GeminiController.java          | 37 +++++++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 src/main/java/com/kernellabs/kernellabs/application/GeminiService.java
 create mode 100644 src/main/java/com/kernellabs/kernellabs/presentation/controller/GeminiController.java

diff --git a/build.gradle b/build.gradle
index 6bef8bf..2977bf9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,11 +29,13 @@ dependencies {
 	implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.7.0'
 	implementation 'org.springframework.boot:spring-boot-starter-validation'
 	implementation 'org.springframework.boot:spring-boot-starter-webflux'
+	implementation 'com.google.genai:google-genai:1.6.0'
 	compileOnly 'org.projectlombok:lombok'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 	runtimeOnly 'com.mysql:mysql-connector-j'
+
 }
 
 tasks.named('test') {
diff --git a/src/main/java/com/kernellabs/kernellabs/application/GeminiService.java b/src/main/java/com/kernellabs/kernellabs/application/GeminiService.java
new file mode 100644
index 0000000..e10234e
--- /dev/null
+++ b/src/main/java/com/kernellabs/kernellabs/application/GeminiService.java
@@ -0,0 +1,46 @@
+package com.kernellabs.kernellabs.application;
+
+import autovalue.shaded.com.google.common.collect.ImmutableList;
+import com.google.genai.Client;
+import com.google.genai.types.GenerateContentConfig;
+import com.google.genai.types.GenerateContentResponse;
+import com.google.genai.types.GoogleSearch;
+import com.google.genai.types.Tool;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+@Service
+public class GeminiService {
+
+    private final Client client;
+    private final Tool googleSearchTool;
+    private final String modelName;
+
+    public GeminiService(
+        @Value("${gemini.api.key}") String apiKey,
+        @Value("${gemini.model:gemini-2.5-flash}") String modelName
+    ) {
+        this.client = Client.builder()
+            .apiKey(apiKey)
+            .build();
+
+        this.googleSearchTool = Tool.builder()
+            .googleSearch(GoogleSearch.builder().build())
+            .build();
+
+        this.modelName = modelName;
+    }
+
+    public String generateAnswer(String prompt) {
+        GenerateContentConfig config = GenerateContentConfig.builder()
+            .tools(ImmutableList.of(googleSearchTool))
+            .build();
+
+        // ← 여기를 client.models()가 아니라 client.models 로 접근
+        GenerateContentResponse res = client.models
+            .generateContent(modelName, prompt, config);
+
+        return res.text();
+    }
+
+}
diff --git a/src/main/java/com/kernellabs/kernellabs/presentation/controller/GeminiController.java b/src/main/java/com/kernellabs/kernellabs/presentation/controller/GeminiController.java
new file mode 100644
index 0000000..1ac63e8
--- /dev/null
+++ b/src/main/java/com/kernellabs/kernellabs/presentation/controller/GeminiController.java
@@ -0,0 +1,37 @@
+package com.kernellabs.kernellabs.presentation.controller;
+
+import com.kernellabs.kernellabs.application.GeminiService;
+import jakarta.validation.Valid;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/genie")
+@AllArgsConstructor
+public class GeminiController {
+    private final GeminiService geminiService;
+
+    @PostMapping("/chat")
+    public ResponseEntity<ChatResponse> chat(@Valid @RequestBody ChatRequest req) {
+        String answer = geminiService.generateAnswer(req.getPrompt());
+        return ResponseEntity.ok(new ChatResponse(answer));
+    }
+
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class ChatRequest {
+        private String prompt;
+    }
+
+    @Data @NoArgsConstructor @AllArgsConstructor
+    public static class ChatResponse {
+        private String answer;
+    }
+}