/**
 * Billing Configuration for Desktop
 * Single source of truth for billing-related constants
 */

export const BILLING_CONFIG = {
  // Credits included in Free plan (per month)
  FREE_CREDITS_PER_MONTH: 50,

  // Credits included in Pro plan (per month)
  INCLUDED_CREDITS_PER_MONTH: 500,

  // Overage pricing (per credit) - also fetched dynamically from Stripe
  OVERAGE_PRICE_PER_CREDIT: 0.05,

  // Credit warning threshold (shows low-balance indicator)
  LOW_CREDIT_THRESHOLD: 10,

  // Threshold at which plan pricing is preloaded (higher than LOW_CREDIT_THRESHOLD
  // so prices are ready before the warning UI appears)
  PLAN_PRICING_PRELOAD_THRESHOLD: 20,

  // Stripe lookup keys
  PRO_PLAN_LOOKUP_KEY: "plan:pro",
  METER_LOOKUP_KEY: "meter:overage",

  // Display formats
  CURRENCY_SYMBOLS: {
    gbp: "£",
    usd: "$",
    eur: "€",
    cny: "¥",
    inr: "₹",
    brl: "R$",
    idr: "Rp",
    jpy: "¥",
  } as const,
} as const;

/**
 * Get current billing configuration
 */
export function getBillingConfig() {
  return BILLING_CONFIG;
}

/**
 * Format overage price with currency symbol
 * @param currency Currency code (e.g., 'usd', 'gbp')
 * @param price Optional price override (defaults to BILLING_CONFIG.OVERAGE_PRICE_PER_CREDIT)
 */
export function getFormattedOveragePrice(
  currency: string = "usd",
  price?: number,
): string {
  const symbol =
    BILLING_CONFIG.CURRENCY_SYMBOLS[
      currency.toLowerCase() as keyof typeof BILLING_CONFIG.CURRENCY_SYMBOLS
    ] || "$";
  const amount = price ?? BILLING_CONFIG.OVERAGE_PRICE_PER_CREDIT;
  return `${symbol}${amount.toFixed(2)}`;
}

/**
 * Get currency symbol from currency code
 */
export function getCurrencySymbol(currency: string): string {
  return (
    BILLING_CONFIG.CURRENCY_SYMBOLS[
      currency.toLowerCase() as keyof typeof BILLING_CONFIG.CURRENCY_SYMBOLS
    ] || currency.toUpperCase()
  );
}