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src/modules/content-writer/providers/deepseek.provider.ts

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+// providers/deepseek.provider.ts
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import OpenAI from 'openai';
+import { IAIProvider, AIMessage, AICompletionOptions, AICompletionResult } from '../interfaces/ai-provider.interface';
+
+/**
+ * DeepSeek dùng OpenAI-compatible API, giá cực rẻ (~$0.14/1M input).
+ * Lý tưởng cho reviewer.
+ */
+@Injectable()
+export class DeepSeekProvider implements IAIProvider {
+    readonly name = 'deepseek';
+    private client: OpenAI;
+    private defaultModel: string;
+
+    constructor(private config: ConfigService) {
+        this.client = new OpenAI({
+            apiKey: this.config.get('DEEPSEEK_API_KEY'),
+            baseURL: 'https://api.deepseek.com/v1',
+        });
+        this.defaultModel = this.config.get('DEEPSEEK_MODEL', 'deepseek-chat');
+    }
+
+    async complete(messages: AIMessage[], options: AICompletionOptions = {}): Promise<AICompletionResult> {
+        console.log(`DeepSeekProvider_deepseek`);
+        const model = options.model ?? this.defaultModel;
+        const res = await this.client.chat.completions.create({
+            model,
+            messages,
+            temperature: options.temperature ?? 0.6,
+            max_tokens: options.maxTokens ?? 400,
+        });
+        return {
+            content: res.choices[0]?.message?.content?.trim() ?? '',
+            tokensUsed: res.usage?.total_tokens ?? 0,
+            model,
+        };
+    }
+}