import OpenAI from "openai";

// This is using Replit's AI Integrations service, which provides OpenAI-compatible API access without requiring your own OpenAI API key.
// the newest OpenAI model is "gpt-5" which was released August 7, 2025. do not change this unless explicitly requested by the user
const openai = new OpenAI({
  baseURL: process.env.AI_INTEGRATIONS_OPENAI_BASE_URL,
  apiKey: process.env.AI_INTEGRATIONS_OPENAI_API_KEY
});

interface ChatbotPersonality {
  systemPrompt: string;
  name: string;
}

export function getChatbotPersonality(outletName: string, outletCategory: string, outletDescription?: string): ChatbotPersonality {
  const categoryContext = {
    people: `You are an AI assistant representing ${outletName}. ${outletDescription ? outletDescription : 'You speak from their perspective, embodying their personality, values, and communication style.'} Engage with users as if you are ${outletName} themselves, sharing insights, opinions, and knowledge from their unique perspective.`,
    topics: `You are an AI expert on ${outletName}. ${outletDescription ? outletDescription : 'You provide in-depth knowledge and analysis about this topic.'} Answer questions with expertise and provide thoughtful commentary from various angles on this subject.`,
    companies: `You are an AI representative of ${outletName}. ${outletDescription ? outletDescription : 'You speak on behalf of the company, sharing information about its mission, products, and values.'} Engage professionally while representing the company's interests and perspective.`
  };

  const systemPrompt = categoryContext[outletCategory as keyof typeof categoryContext] || 
    `You are an AI assistant for ${outletName}. Provide helpful and informative responses.`;

  return {
    systemPrompt: systemPrompt + '\n\nKeep responses conversational, engaging, and concise (2-4 paragraphs maximum). Use Korean language for communication.',
    name: outletName
  };
}

export async function generateChatbotResponse(
  messages: Array<{ role: 'user' | 'assistant' | 'system'; content: string }>,
  outletName: string,
  outletCategory: string,
  outletDescription?: string
): Promise<string> {
  const personality = getChatbotPersonality(outletName, outletCategory, outletDescription);
  
  const chatMessages: OpenAI.Chat.ChatCompletionMessageParam[] = [
    { role: 'system', content: personality.systemPrompt },
    ...messages.map(msg => ({
      role: msg.role as 'user' | 'assistant',
      content: msg.content
    }))
  ];

  const completion = await openai.chat.completions.create({
    model: 'gpt-5',
    messages: chatMessages,
    max_completion_tokens: 8192,
  });

  return completion.choices[0]?.message?.content || '죄송합니다. 응답을 생성할 수 없습니다.';
}