// Math utility functions for Tera templates

// Format a number with commas as thousands separators
fn format_number(num) {
    let str = num.to_string();
    let result = "";
    let len = str.len;
    
    for i in 0..len {
        if i > 0 && (len - i) % 3 == 0 {
            result += ",";
        }
        result += str.substr(i, 1);
    }
    
    result
}

// Calculate percentage
fn percentage(value, total) {
    if total == 0 {
        return "0%";
    }
    
    let pct = (value / total) * 100.0;
    pct.round().to_string() + "%"
}

// Format currency
fn currency(amount, symbol) {
    symbol + format_number(amount.round(2))
}