OV-39: + open-ai service

backend/src/common/services/open-ai/open-ai.service.ts

@@ -0,0 +1,43 @@
+import OpenAI, { type OpenAI as OpenAIType } from 'openai';
+
+import { type BaseConfig } from '~/common/config/base-config.package.js';
+
+import { CHAT_MODEL, MAX_TOKEN } from './libs/constants/constants.js';
+import {
+    type GeneratedText,
+    type Message,
+    type OpenAIService as OpenAIServiceModule,
+} from './libs/types/types.js';
+
+type Constructor = {
+    config: BaseConfig;
+};
+
+class OpenAIService implements OpenAIServiceModule {
+    private config: BaseConfig;
+    private openAi: OpenAIType;
+
+    public constructor({ config }: Constructor) {
+        this.config = config;
+        this.openAi = this.initOpenAi();
+    }
+
+    private initOpenAi = (): OpenAIType => {
+        return new OpenAI({
+            apiKey: this.config.ENV.APP.OPEN_AI_KEY,
+        });
+    };
+
+    public async generateText(messages: Message[]): Promise<GeneratedText> {
+        const completion = await this.openAi.chat.completions.create({
+            messages,
+            model: CHAT_MODEL,
+            max_tokens: MAX_TOKEN,
+        });
+
+        const generatedText = completion.choices[0]?.message.content || '';
+        return { generatedText };
+    }
+}
+
+export { OpenAIService };

backend/src/common/services/services.ts

@@ -1,5 +1,10 @@
+import { config } from '~/common/config/config.js';
+
 import { CryptService } from './crypt/crypt.service.js';
+import { OpenAIService } from './open-ai/open-ai.service.js';
 
+const openAIService = new OpenAIService({ config });
 const cryptService = new CryptService();
 
 export { cryptService };
+export { openAIService };