Quickstart

const handleSubmit = async (e: React.FormEvent) => {
  e.preventDefault();
  if (!input.trim() || isGenerating) return;

  const label = input.trim();
  setInput("");

  // Create the root node first
  const newNode = addNode(label);

  // Automatically trigger expansion
  try {
    setIsGenerating(true);
    const { generateSubInterests } = await import('@/app/actions');
    const sub = await generateSubInterests(label);
    useInterestStore.getState().addNodes(sub, newNode.id);
  } catch (err) {
    console.error(err);
  } finally {
    setIsGenerating(false);
  }
};

export async function generateSubInterests(interest: string) {
  try {
    if (!process.env.GEMINI_API_KEY) {
      console.warn("GEMINI_API_KEY is not defined. Using mock data.");
      return [
        `${interest} Essentials`,
        `Advanced ${interest}`,
        `${interest} Tools`,
      ];
    }

    const response = await ai.models.generateContent({
      model: 'gemini-2.5-flash',
      contents: `You are an AI that helps brainstorm and expand on interests...`,
    });
    
    const text = response.text;
    const cleanText = text.replace(/```json/gi, '').replace(/```/g, '').trim();
    const array = JSON.parse(cleanText);
    
    return array.slice(0, 5); // Return max 5 items
  } catch (error) {
    console.error("Gemini API error:", error);
    return [ /* fallback mock data */ ];
  }
}

export interface InterestNode {
  id: string;
  label: string;
  parentId: string | null;
  x: number;
  y: number;
  z: number;
  vx: number;  // velocity for physics
  vy: number;
  vz: number;
  color: string;
  radius: number;
}