/**
 * Voice/coding turn budgets. No Bare imports.
 *
 * Coding agents may chain many shells. A spoken GNOME assistant should run one
 * command, then answer — otherwise a 4B model loops hostnamectl/uname/free.
 */

function num(value, fallback) {
  const n = Number(value);
  return Number.isFinite(n) && n > 0 ? Math.floor(n) : fallback;
}

function fromPayload(payload, origin) {
  payload = payload || {};
  const voice = payload.voice === true || origin === 'jarvis-qvac';
  const unlimitedShell = payload.maxShellCalls === 0 || payload.maxShellCalls === false;
  return {
    voice,
    maxTurns: num(payload.maxTurns, voice ? 6 : 24),
    maxShellCalls: unlimitedShell ? 0 : num(payload.maxShellCalls, voice ? 1 : 0),
    maxToolRounds: num(payload.maxToolRounds, voice ? 6 : 0),
    completeTimeoutMs: voice ? 45000 : 0,
    completeIdleMs: voice ? 10000 : 0,
    shellCalls: 0,
    toolRounds: 0,
    answerOnly: false,
  };
}

function capped(limit) {
  return limit > 0;
}

function shouldSkipShell(budget) {
  return !!(budget && capped(budget.maxShellCalls) && budget.shellCalls >= budget.maxShellCalls);
}

function markShell(budget) {
  if (!budget) return;
  budget.shellCalls += 1;
  if (shouldSkipShell(budget)) budget.answerOnly = true;
}

function markToolRound(budget) {
  if (!budget) return;
  budget.toolRounds += 1;
  if (capped(budget.maxToolRounds) && budget.toolRounds >= budget.maxToolRounds) budget.answerOnly = true;
}

function forceAnswer(budget) {
  if (budget) budget.answerOnly = true;
}

function skipShellMessage() {
  return 'A terminal command already ran this turn. Answer the user from that output. Do not run another command.';
}

function answerNowMessage() {
  return 'You have tool results. Reply to the user in one to three sentences. Do not call more tools.';
}

const UNFINISHED_TOOL =
  /\b(let me|i(?:'m| am) going to|i(?:'ll| will)|i should|need to)\b[\s\S]{0,160}\b(fetch|search|look(?:ing)? up|check|open|read|run|call|use)\b/i;

function shouldNudgeToolCall(text, budget) {
  if (!budget || !budget.voice || budget.answerOnly) return false;
  const blob = String(text || '');
  if (UNFINISHED_TOOL.test(blob)) return true;
  return /\b(search(?:ing)? again|fetch (?:a |the |that )|look(?:ing)? that up)\b/i.test(blob);
}

function continueToolMessage() {
  return 'Thinking is not an answer. Call the tool now with a concrete query or URL, then speak the result. Do not describe the next step.';
}

function lastToolText(history, maxChars) {
  const list = Array.isArray(history) ? history : [];
  for (let i = list.length - 1; i >= 0; i--) {
    if (list[i] && list[i].role === 'tool' && list[i].content) {
      const text = String(list[i].content).replace(/\s+/g, ' ').trim();
      if (!text) continue;
      const max = maxChars > 0 ? maxChars : 400;
      return text.length > max ? text.slice(0, max) + '…' : text;
    }
  }
  return '';
}

module.exports = {
  fromPayload,
  shouldSkipShell,
  markShell,
  markToolRound,
  forceAnswer,
  skipShellMessage,
  answerNowMessage,
  shouldNudgeToolCall,
  continueToolMessage,
  lastToolText,
};