//! The PARENT elements that host the sweep leaves — `ptloop01`/`ptloop02` as
//! they are declared in the title build itself, not in their nested records.
//!
//! The leaves' own alpha is non-zero at their t=0 (`pteff03` declares 255), yet
//! the capture shows the sweep fading in from ~8. So the gate is the parent's
//! alpha, and this prints it.
//!
//!     cargo run -p sylpheed-formats --example ptloop_parent_keyframes -- GP_TITLE 5
use std::path::PathBuf;
use sylpheed_formats::{pak::PakArchive, ui_layout};

fn main() {
    let root = PathBuf::from(std::env::var("SYLPHEED_DISC").expect("SYLPHEED_DISC"));
    let argv: Vec<String> = std::env::args().skip(1).collect();
    let pak = argv
        .iter()
        .find(|a| a.parse::<usize>().is_err())
        .cloned()
        .unwrap_or_else(|| "GP_TITLE".to_string());
    let ar = PakArchive::open(root.join(format!("dat/{pak}.pak"))).expect("pak");
    let builds: Vec<usize> = argv.iter().filter_map(|a| a.parse().ok()).collect();
    for e in if builds.is_empty() {
        vec![5usize]
    } else {
        builds
    } {
        let Ok(by) = ar.read(&ar.entries()[e]) else {
            continue;
        };
        let Some(b) = ui_layout::parse_build(&by) else {
            continue;
        };
        println!("=== {pak} entry {e}: {} elements ===", b.elements.len());
        for el in &b.elements {
            for (i, k) in el.keyframes.iter().enumerate() {
                println!("  {:<20} kf{i:<2} t={:<5} x={:<6} y={:<6} sx={:<4} sy={:<4} fade={:08X} (alpha {:3})",
                         el.name,
                         k.time.map(|t| t.to_string()).unwrap_or_else(|| "-".into()),
                         k.x, k.y, k.scale_x, k.scale_y, k.fade, k.fade >> 24);
            }
        }
    }
}