// Leave-one-out over the elements that touch a band, dumping raw RGBA each time.
use sylpheed_formats::{pak, ui_layout};
fn main() {
    let mut a = std::env::args().skip(1);
    let pk = a.next().unwrap();
    let bi: usize = a.next().unwrap().parse().unwrap();
    let dir = a.next().unwrap();
    let ar = pak::PakArchive::open(pk).unwrap();
    let by = ar.read(&ar.entries()[bi]).unwrap();
    let b = ui_layout::parse_build(&by).unwrap();
    let o = ui_layout::ComposeOptions {
        backdrop: [0, 0, 0, 255],
        ..Default::default()
    };
    let n = b.elements.len();
    let base = ui_layout::compose(&b, &by, o, None);
    std::fs::write(format!("{dir}/base.raw"), &base.rgba).unwrap();
    println!("canvas {}x{}  elements {n}", base.width, base.height);
    for i in 0..n {
        let e = &b.elements[i];
        let Some(kf) = e.rest() else { continue };
        // only bother with elements whose rest pose can touch the band
        let mut v = vec![true; n];
        v[i] = false;
        let c = ui_layout::compose(&b, &by, o, Some(&v));
        std::fs::write(format!("{dir}/wo-{i}.raw"), &c.rgba).unwrap();
        println!(
            "{i}\t{}\t{}\t({},{})\ta={}",
            e.name,
            e.sprite.clone().unwrap_or_default(),
            kf.x,
            kf.y,
            kf.fade >> 24
        );
    }
}