// Shared Zakat calculation core — Nisab check + 2.5% (1/40) on qualifying
// wealth held above threshold. Nisab is entered as a value, not a live gold
// price feed — matches the app's "manual entry only" philosophy already
// established for Asset Registry / Faraid.
const ZAKAT_RATE = 0.025;

// Rough starting points, NOT live prices — the app has no gold/silver price
// feed (manual entry only, matching the rest of the app). These exist so a
// new user isn't staring at a blank/zero Nisab field; they must still verify
// today's actual 85g-gold-equivalent value before relying on the result.
export const CURRENCY_BY_JURISDICTION = { MY: 'RM', SG: 'SGD', UK: 'GBP' };
export const DEFAULT_NISAB_BY_JURISDICTION = { MY: 24000, SG: 8000, UK: 5000 };

export function zakatableWealth(fields) {
  const gross = (Number(fields.cash) || 0) + (Number(fields.gold) || 0) + (Number(fields.silver) || 0)
    + (Number(fields.businessAssets) || 0) + (Number(fields.investments) || 0) + (Number(fields.otherZakatable) || 0);
  const deductible = Number(fields.deductibleLiabilities) || 0;
  return Math.max(0, gross - deductible);
}

export function zakatDue(fields) {
  const wealth = zakatableWealth(fields);
  const nisab = Number(fields.nisabThreshold) || 0;
  if (nisab <= 0 || wealth < nisab) return 0;
  return wealth * ZAKAT_RATE;
}

export function meetsNisab(fields) {
  const nisab = Number(fields.nisabThreshold) || 0;
  return nisab > 0 && zakatableWealth(fields) >= nisab;
}