import type { SuperagentCurrentUsage } from '../../types';

/**
 * Whether the workspace has run out of builder/chat credits, mirroring the web
 * builder's derivation in `AppContext` (`isOutOfCredits` useMemo). Kept as a pure
 * function so it can be unit-tested and reused by the runtime hook.
 *
 * Out of credits when any of:
 *   - the backend already flagged `is_over_limit`, or
 *   - daily usage hit the daily limit and there's no gift-card balance to fall back on, or
 *   - monthly usage hit the effective monthly limit (base monthly limit + gift-card
 *     remaining, when a monthly limit applies).
 */
export function computeIsOutOfCredits(usage: SuperagentCurrentUsage | null | undefined): boolean {
  if (!usage) return false;

  const giftCardRemaining =
    usage.monthly_limit != null ? usage.gift_card_credit_details?.remaining ?? 0 : 0;
  const effectiveMonthlyLimit = (usage.monthly_limit ?? 0) + giftCardRemaining;

  return Boolean(
    usage.is_over_limit ||
      (usage.daily_usage >= (usage.daily_limit || 1_000_000) && !giftCardRemaining) ||
      (usage.monthly_limit != null && usage.monthly_usage >= effectiveMonthlyLimit),
  );
}

export function isCreditSendAllowed({
  isOutOfCredits,
  usageReady,
}: {
  isOutOfCredits: boolean;
  usageReady: boolean;
}): boolean {
  return usageReady && !isOutOfCredits;
}

function isDailyLimitHit(usage: SuperagentCurrentUsage): boolean {
  const giftCardRemaining =
    usage.monthly_limit != null ? usage.gift_card_credit_details?.remaining ?? 0 : 0;
  return usage.daily_usage >= (usage.daily_limit || 1_000_000) && !giftCardRemaining;
}

const usageProperties = (usage: SuperagentCurrentUsage) => ({
  daily_usage: usage.daily_usage,
  daily_limit: usage.daily_limit,
  monthly_usage: usage.monthly_usage,
  monthly_limit: usage.monthly_limit,
  is_over_limit: usage.is_over_limit,
});

/** Mixpanel payload matching the web OutOfCreditsMessage impression event. */
export function buildOutOfCreditsShownProperties(usage: SuperagentCurrentUsage) {
  const hitDailyLimit = isDailyLimitHit(usage);
  return {
    ...usageProperties(usage),
    hit_daily_limit: hitDailyLimit,
    hit_monthly_limit: !hitDailyLimit && usage.is_over_limit,
  };
}

/** Mixpanel payload matching the web OutOfCreditsMessage upgrade CTA event. */
export function buildOutOfCreditsUpgradeProperties(usage: SuperagentCurrentUsage) {
  return {
    cta: 'View all plans',
    origin: 'chat out of credits message',
    target_route: '/billing',
    upgrade_type: 'billing_dialog',
    ...usageProperties(usage),
    is_daily_limit_hit: isDailyLimitHit(usage),
  };
}