// Bingo AI — opponents auto-daub inside BingoLogic.drawBall, so the only AI
// "decision" is the claim race: how long an eligible opponent waits before
// shouting BINGO. That delay is the window in which the human can beat them.

import { hasCompletedLine } from './BingoLogic.js';

// Non-human seats that currently hold a completed line.
export function aiEligibleSeats(state) {
  return state.players
    .filter((p) => !p.isHuman && hasCompletedLine(p))
    .map((p) => p.seat);
}

// Suspense delay (ms) before an eligible AI auto-calls Bingo. Jittered around
// ~1.5s; sharper (higher-skill) opponents react a touch faster.
export function chooseClaimDelayMs(seat, skill = 3) {
  const base = 1700 - skill * 120;
  return base + Math.random() * 500;
}

// When the human forfeits (advances without claiming) and ≥1 AI is eligible,
// the fastest reactor wins. Tie-break by lowest seat for determinism.
export function pickEarliestAIWinner(state) {
  const seats = aiEligibleSeats(state);
  if (seats.length === 0) return null;
  let best = seats[0];
  let bestDelay = chooseClaimDelayMs(best);
  for (let i = 1; i < seats.length; i++) {
    const d = chooseClaimDelayMs(seats[i]);
    if (d < bestDelay) { best = seats[i]; bestDelay = d; }
  }
  return best;
}