src/lib/agent/thinkingExpander.ts

/**
 * thinkingExpander.ts — Gap 4: Inference Scaling con 2 approcci alternativi
 *
 * Genera 2 approcci per task ad alta incertezza, sceglie il migliore.
 * Budget: 1 LLM call. Attivazione: solo task incerti o > 100 chars.
 */

import type { LLMCallerFn } from "./agentRuntimeTypes";

export interface ThinkingResult {
  chosenApproach: string;
  alternatives:   string[];
  confidence:     number;
}

const HIGH_UNCERTAINTY_SIGNALS = [
  "non so", "non sono sicuro", "forse", "potrebbe",
  "I'm not sure", "might", "could be", "unclear",
  "come fare", "how to", "best way",
];

function isHighUncertainty(task: string): boolean {
  const t = task.toLowerCase();
  return HIGH_UNCERTAINTY_SIGNALS.some(s => t.includes(s));
}

export async function expandThinking(
  task:      string,
  llmCaller: LLMCallerFn,
): Promise<ThinkingResult | null> {
  if (!isHighUncertainty(task) && task.length < 100) return null;
  try {
    const raw = await llmCaller([
      {
        role: "system",
        content:
          "Genera 2 approcci alternativi per risolvere il task. " +
          'Rispondi SOLO con JSON: {"approaches": ["approccio 1...", "approccio 2..."], "best": 0, "confidence": 7}\n' +
          "best è l'indice (0 o 1) dell'approccio migliore.",
      },
      { role: "user", content: `TASK: ${task}` },
    ]);
    const clean = raw.replace(/```json|```/g, "").trim();
    const parsed = JSON.parse(clean);
    return {
      chosenApproach: parsed.approaches?.[parsed.best ?? 0] ?? task,
      alternatives:   parsed.approaches ?? [],
      confidence:     parsed.confidence ?? 5,
    };
  } catch {
    return null;
  }
}