//! Which container should the next runtime capture aim at?
//!
//! The 2026-08-13 stage-05 capture showed that a mission keeps several containers
//! resident and that its OWN `Stage_SNN.xpr` is among them (the f101 ACROPOLIS was
//! drawn from `Stage_S05.xpr`), so a capture can be aimed by choosing the mission.
//! This ranks the targets: for every XBG7 resource on the disc it records the
//! containers where it decodes and the ones where it does not, then reports
//!
//!   * resources that decode **nowhere** — the real gaps, where a capture is the
//!     only ground truth left;
//!   * per container, how many of those it holds (fly that mission);
//!   * resources that miss in one container but decode in another — a defect worth
//!     fixing, but the geometry is already recoverable, so a capture is not needed.
//!
//! Usage: miss_targets <resource3d_dir>
use sylpheed_formats::mesh::{xbg7_resource_names, Xbg7Model};
use std::collections::{BTreeMap, BTreeSet};

fn main() {
    let dir = std::env::args().nth(1).expect("resource3d dir");
    let mut files: Vec<_> = std::fs::read_dir(&dir)
        .unwrap()
        .flatten()
        .map(|e| e.path())
        .filter(|p| p.extension().and_then(|s| s.to_str()) == Some("xpr"))
        .collect();
    files.sort();

    // resource -> (containers where it decodes, containers where it misses)
    let mut ok: BTreeMap<String, BTreeSet<String>> = BTreeMap::new();
    let mut miss: BTreeMap<String, BTreeSet<String>> = BTreeMap::new();
    for f in &files {
        let Ok(bytes) = std::fs::read(f) else { continue };
        let where_ = f.file_name().unwrap().to_string_lossy().to_string();
        let declared: BTreeSet<String> = xbg7_resource_names(&bytes).into_iter().collect();
        if declared.is_empty() {
            continue;
        }
        let decoded: BTreeSet<String> =
            Xbg7Model::stage_models(&bytes).into_iter().map(|m| m.name).collect();
        for n in &declared {
            if decoded.contains(n) {
                ok.entry(n.clone()).or_default().insert(where_.clone());
            } else {
                miss.entry(n.clone()).or_default().insert(where_.clone());
            }
        }
    }

    let never: BTreeMap<&String, &BTreeSet<String>> =
        miss.iter().filter(|(n, _)| !ok.contains_key(*n)).collect();
    let recoverable: Vec<&String> = miss.keys().filter(|n| ok.contains_key(*n)).collect();

    println!("resources that decode NOWHERE: {}", never.len());
    println!("resources that miss somewhere but decode elsewhere: {}\n", recoverable.len());

    // Rank containers by how many never-decoding resources they hold.
    let mut per_container: BTreeMap<&String, Vec<&String>> = BTreeMap::new();
    for (n, wheres) in &never {
        for w in wheres.iter() {
            per_container.entry(w).or_default().push(n);
        }
    }
    let mut ranked: Vec<_> = per_container.iter().collect();
    ranked.sort_by_key(|(_, v)| std::cmp::Reverse(v.len()));
    println!("container                   never-decoding resources it holds");
    for (w, v) in ranked.iter().take(14) {
        let sample: Vec<&str> = v.iter().take(6).map(|s| s.as_str()).collect();
        println!("{:<26} {:>3}   {}", w, v.len(), sample.join(", "));
    }

    // Exclusives: a never-decoding resource that only ONE container holds is only
    // reachable through whatever loads that container.
    let excl: Vec<(&&String, &&BTreeSet<String>)> =
        never.iter().filter(|(_, w)| w.len() == 1).collect();
    println!("\nof the never-decoding, {} live in exactly one container", excl.len());
    let mut by_one: BTreeMap<&String, Vec<&String>> = BTreeMap::new();
    for (n, w) in &excl {
        by_one.entry(w.iter().next().unwrap()).or_default().push(n);
    }
    let mut b: Vec<_> = by_one.iter().collect();
    b.sort_by_key(|(_, v)| std::cmp::Reverse(v.len()));
    for (w, v) in b.iter().take(10) {
        println!("  {:<24} {:>3}   {}", w, v.len(), v.iter().take(5).map(|s| s.as_str()).collect::<Vec<_>>().join(", "));
    }
}