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<?php
// Multi-Currency Configuration

// Exchange rates (base currency: INR)
$CURRENCY_RATES = [
    'INR' => ['symbol' => '₹', 'rate' => 1.00, 'name' => 'Indian Rupees'],
    'USD' => ['symbol' => '$', 'rate' => 0.012, 'name' => 'US Dollar'],
    'EUR' => ['symbol' => '€', 'rate' => 0.011, 'name' => 'Euro'],
    'GBP' => ['symbol' => '£', 'rate' => 0.0095, 'name' => 'British Pound'],
    'AUD' => ['symbol' => 'A$', 'rate' => 0.018, 'name' => 'Australian Dollar'],
    'CAD' => ['symbol' => 'C$', 'rate' => 0.016, 'name' => 'Canadian Dollar'],
    'JPY' => ['symbol' => '¥', 'rate' => 1.79, 'name' => 'Japanese Yen'],
    'CNY' => ['symbol' => '¥', 'rate' => 0.087, 'name' => 'Chinese Yuan'],
    'HKD' => ['symbol' => 'HK$', 'rate' => 0.093, 'name' => 'Hong Kong Dollar'],
    'NZD' => ['symbol' => 'NZ$', 'rate' => 0.020, 'name' => 'New Zealand Dollar']
];

// Default currency
define('DEFAULT_CURRENCY_CODE', 'INR');

/**
 * Get selected currency from session or default
 */
function getSelectedCurrency() {
    return $_SESSION['selected_currency'] ?? DEFAULT_CURRENCY_CODE;
}

/**
 * Convert price to selected currency
 */
function convertPrice($priceINR, $toCurrency = null) {
    global $CURRENCY_RATES;
    
    if ($toCurrency === null) {
        $toCurrency = getSelectedCurrency();
    }
    
    if (!isset($CURRENCY_RATES[$toCurrency])) {
        $toCurrency = DEFAULT_CURRENCY_CODE;
    }
    
    return $priceINR * $CURRENCY_RATES[$toCurrency]['rate'];
}

/**
 * Format price with currency symbol
 */
function formatPrice($priceINR, $currency = null) {
    global $CURRENCY_RATES;
    
    if ($currency === null) {
        $currency = getSelectedCurrency();
    }
    
    if (!isset($CURRENCY_RATES[$currency])) {
        $currency = DEFAULT_CURRENCY_CODE;
    }
    
    $converted = convertPrice($priceINR, $currency);
    $symbol = $CURRENCY_RATES[$currency]['symbol'];
    
    // Format based on currency
    if ($currency === 'JPY') {
        return $symbol . number_format($converted, 0); // No decimals for JPY
    } else {
        return $symbol . number_format($converted, 2);
    }
}

/**
 * Get currency symbol
 */
function getCurrencySymbol($currency = null) {
    global $CURRENCY_RATES;
    
    if ($currency === null) {
        $currency = getSelectedCurrency();
    }
    
    return $CURRENCY_RATES[$currency]['symbol'] ?? '₹';
}

/**
 * Get all available currencies
 */
function getAllCurrencies() {
    global $CURRENCY_RATES;
    return $CURRENCY_RATES;
}
?>