//! What differs between equal-button-count `GP_DIALOG` adjacent pairs?
//!
//! All 39 share button names and rows. That is consistent with a LANGUAGE PAIR and
//! equally with TWO DIALOGS SHARING A BUTTON TEMPLATE (two yes/no boxes differing
//! only in their message sprite). The difference is in what else differs: a
//! language pair should differ in the SAME slots with locale-marked names.
//!
//!     cargo run -p sylpheed-formats --example dialog_pair_diffs
use std::collections::BTreeSet;
use std::path::PathBuf;
use sylpheed_formats::{pak::PakArchive, ui_layout};

fn names(ar: &PakArchive, i: usize) -> Option<BTreeSet<String>> {
    let by = ar.read(&ar.entries()[i]).ok()?;
    let b = ui_layout::parse_build(&by)?;
    Some(b.elements.iter().map(|e| e.name.clone()).collect())
}

fn main() {
    let root = PathBuf::from(std::env::var("SYLPHEED_DISC").expect("SYLPHEED_DISC"));
    let ar = PakArchive::open(root.join("dat/GP_DIALOG.pak")).expect("GP_DIALOG");
    let n = ar.entries().len();
    let mut shown = 0;
    for k in (0..n).step_by(2) {
        let (Some(a), Some(b)) = (names(&ar, k), names(&ar, k + 1)) else {
            continue;
        };
        if a == b {
            continue;
        }
        let oa: Vec<&String> = a.difference(&b).collect();
        let ob: Vec<&String> = b.difference(&a).collect();
        // only the equal-button-count ones
        let ba = a.iter().filter(|x| x.contains("btn")).count();
        let bb = b.iter().filter(|x| x.contains("btn")).count();
        if ba != bb {
            continue;
        }
        if shown < 6 {
            println!(
                "entries {k:3}/{:<3}  shared {}  only-in-{k}: {:?}  only-in-{}: {:?}",
                k + 1,
                a.intersection(&b).count(),
                oa,
                k + 1,
                ob
            );
            shown += 1;
        }
    }
}