// Abandon penalty (v0.12.0) — dropping a loaded package costs a fraction of its
// payout that grows with time pressure: 15% right after creation, up to 60% at
// the deadline. Pure function shared by the server action (lib/game/actions.ts)
// and the client-side preview in components/RightPane.tsx so both always agree.

export const ABANDON_PENALTY_MIN = 0.15; // fraction of the payout, at creation time
export const ABANDON_PENALTY_SPAN = 0.45; // added across the package's lifetime → max 60% at the deadline

// The penalty fraction for a given elapsedFraction ∈ [0, 1] (clamped).
export function abandonPenaltyPct(elapsedFraction: number): number {
  const f = Math.min(1, Math.max(0, elapsedFraction));
  return ABANDON_PENALTY_MIN + ABANDON_PENALTY_SPAN * f;
}

// How much of the package's lifetime has elapsed at clockMs (clamped to [0, 1]).
export function elapsedFractionFor(createdSimTime: number, deadlineSimTime: number, clockMs: number): number {
  const span = deadlineSimTime - createdSimTime;
  if (span <= 0) return 1; // degenerate — treat as fully elapsed (max penalty)
  return Math.min(1, Math.max(0, (clockMs - createdSimTime) / span));
}

// The exact € penalty for abandoning `pkg` at game time clockMs. An already-
// EXPIRED package abandons for free; cash is floored at 0 by the caller
// (account.cash = max(0, cash − penalty)). Rounded to cents like all money math.
export function abandonPenalty(
  pkg: { status: string; reward: number; createdSimTime: number; deadlineSimTime: number },
  clockMs: number,
): number {
  if (pkg.status === 'expired') return 0;
  const pct = abandonPenaltyPct(elapsedFractionFor(pkg.createdSimTime, pkg.deadlineSimTime, clockMs));
  return Math.round(pkg.reward * pct * 100) / 100;
}