Generate PDFs programmatically in Rust.

use pdfluent::{Document, Page, Font, Color};

fn generate_invoice(order: &Order) -> Vec<u8> {
    let mut doc = Document::new();
    let mut page = Page::a4();

    // Title
    page.add_text(
        &format!("Invoice #{}", order.id),
        Font::helvetica_bold(24),
        Position::new(50.0, 780.0),
    );

    // Line items table
    let mut y = 700.0;
    for item in &order.items {
        page.add_text(
            &item.description,
            Font::helvetica(11),
            Position::new(50.0, y),
        );
        page.add_text(
            &format!("€ {:.2}", item.price),
            Font::helvetica(11),
            Position::new(480.0, y),
        );
        y -= 20.0;
    }

    // Footer
    page.add_text(
        &format!("Total: € {:.2}", order.total),
        Font::helvetica_bold(13),
        Position::new(50.0, y - 20.0),
    );

    doc.add_page(page);
    doc.save_bytes()
}