src/lib/chatCompletion.ts

import { get } from "svelte/store";
import { chatParams } from "../stores/chatParams";
import { messages } from "../stores/messages";
import { uiParams } from "../stores/uiParams";
import { hfClient } from "./hfClient";
import { runTypingAnimation } from "./typingAnimation";

export async function sendChatMessage(userInput: string) {
  const client = get(hfClient);
  const chat = get(chatParams);

  if (!client) {
    messages.addMessage("assistant", "Error: Please login Hugging Face.");
    return;
  }

  try {
    const response = await client.chatCompletion({
      model: "openai/gpt-oss-20b",
      messages: [
        { role: "system", content: chat.system_prompt },
        { role: "user", content: userInput },
      ],
      temperature: chat.temperature,
      top_p: chat.top_p,
      max_tokens: chat.max_tokens,
    });

    const reply = response.choices?.[0]?.message?.content || "[No response]";
    await runTypingAnimation(reply, get(uiParams).typingAnimation);
    messages.addMessage("assistant", reply);
  } catch (err) {
    const errorMsg =
      err instanceof Error ? err.message : "Unknown error occurred";
    messages.addMessage("assistant", `Error: ${errorMsg}`);
  }
}