export const CountryCurrencies: Readonly<Record<string, string>> = Object.freeze({
    // India
    "IN": "INR", "IND": "INR", "INDIA": "INR",

    // United States
    "US": "USD", "USA": "USD", "UNITED STATES": "USD",

    // United Kingdom
    "GB": "GBP", "UK": "GBP", "GBR": "GBP", "UNITED KINGDOM": "GBP",

    // UAE
    "AE": "AED", "ARE": "AED", "UAE": "AED", "UNITED ARAB EMIRATES": "AED",

    // European Union (Euro countries)
    "EU": "EUR",
    "DE": "EUR", "DEU": "EUR", "GERMANY": "EUR",
    "FR": "EUR", "FRA": "EUR", "FRANCE": "EUR",
    "IT": "EUR", "ITA": "EUR", "ITALY": "EUR",
    "ES": "EUR", "ESP": "EUR", "SPAIN": "EUR",
    "NL": "EUR", "NLD": "EUR", "NETHERLANDS": "EUR",
    "BE": "EUR", "BEL": "EUR", "BELGIUM": "EUR",
    "AT": "EUR", "AUT": "EUR", "AUSTRIA": "EUR",
    "PT": "EUR", "PRT": "EUR", "PORTUGAL": "EUR",
    "IE": "EUR", "IRL": "EUR", "IRELAND": "EUR",
    "GR": "EUR", "GRC": "EUR", "GREECE": "EUR",
    "FI": "EUR", "FIN": "EUR", "FINLAND": "EUR",

    // Asia
    "JP": "JPY", "JPN": "JPY", "JAPAN": "JPY",
    "CN": "CNY", "CHN": "CNY", "CHINA": "CNY",
    "SG": "SGD", "SGP": "SGD", "SINGAPORE": "SGD",
    "HK": "HKD", "HKG": "HKD", "HONG KONG": "HKD",
    "KR": "KRW", "KOR": "KRW", "SOUTH KOREA": "KRW",
    "TH": "THB", "THA": "THB", "THAILAND": "THB",
    "MY": "MYR", "MYS": "MYR", "MALAYSIA": "MYR",
    "ID": "IDR", "IDN": "IDR", "INDONESIA": "IDR",
    "PH": "PHP", "PHL": "PHP", "PHILIPPINES": "PHP",
    "VN": "VND", "VNM": "VND", "VIETNAM": "VND",

    // Middle East
    "SA": "SAR", "SAU": "SAR", "SAUDI ARABIA": "SAR",
    "QA": "QAR", "QAT": "QAR", "QATAR": "QAR",
    "OM": "OMR", "OMN": "OMR", "OMAN": "OMR",
    "KW": "KWD", "KWT": "KWD", "KUWAIT": "KWD",
    "BH": "BHD", "BHR": "BHD", "BAHRAIN": "BHD",
    "IL": "ILS", "ISR": "ILS", "ISRAEL": "ILS",
    "TR": "TRY", "TUR": "TRY", "TURKEY": "TRY",

    // Americas
    "CA": "CAD", "CAN": "CAD", "CANADA": "CAD",
    "MX": "MXN", "MEX": "MXN", "MEXICO": "MXN",
    "BR": "BRL", "BRA": "BRL", "BRAZIL": "BRL",
    "AR": "ARS", "ARG": "ARS", "ARGENTINA": "ARS",
    "CL": "CLP", "CHL": "CLP", "CHILE": "CLP",
    "CO": "COP", "COL": "COP", "COLOMBIA": "COP",

    // Oceania
    "AU": "AUD", "AUS": "AUD", "AUSTRALIA": "AUD",
    "NZ": "NZD", "NZL": "NZD", "NEW ZEALAND": "NZD",

    // Europe (non-Euro)
    "CH": "CHF", "CHE": "CHF", "SWITZERLAND": "CHF",
    "SE": "SEK", "SWE": "SEK", "SWEDEN": "SEK",
    "NO": "NOK", "NOR": "NOK", "NORWAY": "NOK",
    "DK": "DKK", "DNK": "DKK", "DENMARK": "DKK",
    "PL": "PLN", "POL": "PLN", "POLAND": "PLN",
    "CZ": "CZK", "CZE": "CZK", "CZECH REPUBLIC": "CZK",
    "HU": "HUF", "HUN": "HUF", "HUNGARY": "HUF",
    "RO": "RON", "ROU": "RON", "ROMANIA": "RON",
    "RU": "RUB", "RUS": "RUB", "RUSSIA": "RUB",

    // Africa
    "ZA": "ZAR", "ZAF": "ZAR", "SOUTH AFRICA": "ZAR",
    "EG": "EGP", "EGY": "EGP", "EGYPT": "EGP",
    "NG": "NGN", "NGA": "NGN", "NIGERIA": "NGN",
    "KE": "KES", "KEN": "KES", "KENYA": "KES",
});

/** Every currency code the platform can derive. */
const KnownCurrencies: ReadonlySet<string> = new Set(Object.values(CountryCurrencies));

/**
 * ISO 4217 minor-unit exponent (decimal places of money) for the currencies
 * whose exponent is not 2. Every other known currency has 2.
 */
const NonTwoDecimalCurrencies: Readonly<Record<string, number>> = Object.freeze({
    JPY: 0, KRW: 0, VND: 0, CLP: 0,
    BHD: 3, KWD: 3, OMR: 3,
});

/**
 * Decimal places money carries in a known ISO 4217 currency (INR 2, JPY 0,
 * KWD 3), or null for a code the platform does not know. This is the
 * currency's own precision; `BCurr.DPlace` is display configuration and does
 * not change it.
 */
export function GetMoneyMinorUnitExponent(currencyCode?: string | null): number | null {
    const normalized = (currencyCode ?? "").trim().toUpperCase();
    if (!KnownCurrencies.has(normalized)) return null;
    return NonTwoDecimalCurrencies[normalized] ?? 2;
}

export function ResolveMoneyCurrencyFromEntity(entity: any): string | null {
    const nonempty = (...values: unknown[]): string | null => {
        for (const value of values) if (typeof value === "string" && value.trim()) return value.trim().toUpperCase();
        return null;
    };
    const explicit = nonempty(entity?.Config?.Common?.BCurr?.CurrencyCode, entity?.Config?.Common?.BCurr?.CCode);
    if (explicit) return explicit;
    const country = nonempty(entity?.Config?.Common?.CCode, entity?.Config?.Common?.Country, entity?.CCode, entity?.Country, entity?.BiAdrs?.CCode, entity?.BiAdrs?.Country);
    return country ? CountryCurrencies[country] ?? null : null;
}