import { Injectable, Logger } from '@nestjs/common';
import { DeepSeekProvider } from '../ai/providers/deepseek.provider';
import type { AiChatDto } from './dto/ai-chat.dto';

@Injectable()
export class AdminAiChatService {
  private readonly logger = new Logger(AdminAiChatService.name);

  constructor(private readonly deepseek: DeepSeekProvider) {}

  async chat(dto: AiChatDto) {
    const systemMessages = dto.messages.filter(m => m.role === 'system');
    const hasSystemPrompt = systemMessages.length > 0;

    const messages = hasSystemPrompt
      ? dto.messages
      : [
          { role: 'system' as const, content: '你是知习管理后台的 AI 任务助理，帮助管理员处理日常任务、解答问题。请用简洁专业的中文回复。' },
          ...dto.messages,
        ];

    const start = Date.now();
    const result = await this.deepseek.generate({
      model: 'deepseek-chat',
      messages,
      temperature: 0.7,
      maxTokens: 4096,
    });

    this.logger.log(`AI chat completed in ${Date.now() - start}ms, tokens: ${result.usage?.inputTokens ?? 0}/${result.usage?.outputTokens ?? 0}`);

    return {
      content: result.rawText,
      usage: result.usage,
    };
  }

  getDashboardConfig() {
    return {
      url: 'http://10.2.0.7:9119',
      token: 'v8dAkvcsHaHe_yok5kjO0QErKtogQcq3IKaJT8PNczQ',
      description: 'Hermes Agent Dashboard — 4核4G 上的 AI Agent，可执行服务器管理、文件操作等高级任务',
    };
  }
}