Split PDFs by page, bookmark, or pattern.

use pdfluent::{Sdk, split::{SplitOptions, SplitBy}};

fn main() -> pdfluent::Result<()> {
    let sdk = Sdk::new()?;
    let doc = sdk.open("annual_report.pdf")?;

    // Split at every level-1 bookmark boundary
    let opts = SplitOptions::builder()
        .by(SplitBy::BookmarkLevel(1))
        .preserve_child_bookmarks(true)
        .preserve_page_labels(true)
        .preserve_named_destinations(true)
        .build();

    let parts = doc.split(opts)?;

    for (i, part) in parts.iter().enumerate() {
        let path = format!("output/chapter_{:02}.pdf", i + 1);
        part.save(&path)?;
        println!(
            "Chapter {}: {} pages, {} bookmarks",
            i + 1,
            part.page_count(),
            part.bookmark_count()
        );
    }

    Ok(())
}