viewer: Game Data browser (View ▸ Game Data)

Wire the decoded game_data + localization tables into the viewer as a
browsable window. View ▸ Game Data opens a floating panel with category
tabs — Weapons, Craft, Capital Ships, Characters, Missions, Arsenal,
Flights — decoded off-thread from GP_MAIN_GAME_E + GP_HANGAR_ARSENAL.

- Weapons/Craft/Ships: sortable stat grids (power/velocity/range;
  HP/cruise/accel/radar/turrets; HP/length/turrets/bridges/shield-gen),
  with a live name filter.
- Characters: name (localized) + faction (colour-coded) + portrait count.
- Missions: collapsible per stage — location, resolved objectives, fail
  conditions, and the enemy roster with HP.
- Arsenal: the player's nose/arm weapon options in four columns.
- Flights: distinct wingman line-ups.

Its own egui system (keeps draw_viewer_ui under Bevy's 16-param limit);
a RequestGameData event from the menu opens it and lazily decodes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/sylpheed-viewer/src/iso_loader.rs

@@ -503,6 +503,89 @@ pub struct VoiceLibrary {
 #[derive(Event, Default)]
 pub struct RequestVoiceLibrary;
 
+// ── Game-data browser (decoded IDXD tables) ────────────────────────────────────
+
+/// Which decoded table the Game Data browser is showing.
+#[derive(Clone, Copy, PartialEq, Eq, Default)]
+pub enum GameCategory {
+    #[default]
+    Weapons,
+    Craft,
+    Vessels,
+    Characters,
+    Missions,
+    Arsenal,
+    Flights,
+}
+
+impl GameCategory {
+    pub const ALL: [GameCategory; 7] = [
+        GameCategory::Weapons,
+        GameCategory::Craft,
+        GameCategory::Vessels,
+        GameCategory::Characters,
+        GameCategory::Missions,
+        GameCategory::Arsenal,
+        GameCategory::Flights,
+    ];
+    pub fn label(self) -> &'static str {
+        match self {
+            GameCategory::Weapons => "Weapons",
+            GameCategory::Craft => "Craft",
+            GameCategory::Vessels => "Capital Ships",
+            GameCategory::Characters => "Characters",
+            GameCategory::Missions => "Missions",
+            GameCategory::Arsenal => "Arsenal",
+            GameCategory::Flights => "Flights",
+        }
+    }
+}
+
+/// A character row, name resolved via localization.
+pub struct CharRow {
+    pub name: String,
+    pub faction: String,
+    pub faces: usize,
+}
+
+/// A mission row: stage + its resolved briefing.
+pub struct MissionRow {
+    pub id: String,
+    pub location: String,
+    pub phases: u32,
+    pub objectives: Vec<String>,
+    pub lose: Vec<String>,
+    pub enemies: Vec<String>,
+}
+
+/// Everything the Game Data browser shows, decoded off-thread from the paks.
+#[derive(Default)]
+pub struct GameSnapshot {
+    pub weapons: Vec<sylpheed_formats::game_data::Weapon>,
+    pub craft: Vec<sylpheed_formats::game_data::CraftUnit>,
+    pub vessels: Vec<sylpheed_formats::game_data::Vessel>,
+    pub characters: Vec<CharRow>,
+    pub missions: Vec<MissionRow>,
+    pub arsenal: sylpheed_formats::game_data::Arsenal,
+    /// Distinct flight line-ups: `(callsign, pilot)` rows.
+    pub flights: Vec<Vec<(String, String)>>,
+}
+
+/// The Game Data browser state (decoded combat / mission / cast tables).
+#[derive(Resource, Default)]
+pub struct GameData {
+    pub open: bool,
+    pub loading: bool,
+    pub loaded: bool,
+    pub category: GameCategory,
+    pub filter: String,
+    pub snapshot: GameSnapshot,
+}
+
+/// Ask the loader to decode the game-data tables.
+#[derive(Event, Default)]
+pub struct RequestGameData;
+
 /// The currently-open IPFB data pack, shown as a master-detail browser.
 #[derive(Resource, Default)]
 pub struct PakView {
@@ -593,6 +676,8 @@ enum IsoLoaderMsg {
     VoiceLibraryLoaded {
         clips: Vec<sylpheed_formats::slb::VoiceClip>,
     },
+    /// The decoded game-data tables for the browser.
+    GameDataLoaded(Box<GameSnapshot>),
     /// User dismissed the file dialog — not an error.
     Cancelled,
     Error(String),
@@ -810,10 +895,12 @@ impl Plugin for IsoLoaderPlugin {
             .init_resource::<MovieVoice>()
             .init_resource::<AudioPreview>()
             .init_resource::<VoiceLibrary>()
+            .init_resource::<GameData>()
             .add_event::<RequestSubtitles>()
             .add_event::<RequestVoice>()
             .add_event::<RequestAudio>()
-            .add_event::<RequestVoiceLibrary>();
+            .add_event::<RequestVoiceLibrary>()
+            .add_event::<RequestGameData>();
 
         #[cfg(not(target_arch = "wasm32"))]
         {
@@ -842,6 +929,7 @@ impl Plugin for IsoLoaderPlugin {
                         handle_audio_request,
                         advance_audio_playback,
                         handle_voice_library_request,
+                        handle_game_data_request,
                     )
                         .chain()
                         .in_set(IsoLoaderSystemSet),
@@ -1681,6 +1769,7 @@ fn poll_loader_channel(
     mut mvoice: ResMut<MovieVoice>,
     mut audio_preview: ResMut<AudioPreview>,
     mut voice_lib: ResMut<VoiceLibrary>,
+    mut game_data: ResMut<GameData>,
 ) {
     let receiver = channels.receiver.lock().unwrap();
     loop {
@@ -1793,6 +1882,18 @@ fn poll_loader_channel(
                     voice_lib.loaded = true;
                 }
             }
+            Ok(IsoLoaderMsg::GameDataLoaded(snap)) => {
+                game_data.loading = false;
+                // An empty snapshot means the decode failed (no game source, or a
+                // bare pak) — leave `loaded=false` so re-opening retries.
+                let empty = snap.weapons.is_empty() && snap.craft.is_empty() && snap.missions.is_empty();
+                if empty {
+                    game_data.loaded = false;
+                } else {
+                    game_data.snapshot = *snap;
+                    game_data.loaded = true;
+                }
+            }
             Ok(IsoLoaderMsg::Cancelled) => {
                 iso_state.loading = false;
                 browser.loading = false;
@@ -3462,6 +3563,109 @@ fn handle_audio_request(
     });
 }
 
+/// Handles a [`RequestGameData`]: decodes the combat / mission / cast tables
+/// off-thread and posts the snapshot back for the browser.
+#[cfg(not(target_arch = "wasm32"))]
+fn handle_game_data_request(
+    mut events: EventReader<RequestGameData>,
+    iso_state: Res<IsoState>,
+    channels: Res<IsoChannels>,
+) {
+    if events.read().next().is_none() {
+        return;
+    }
+    let source = iso_state.source_kind.clone();
+    let sender = channels.sender.clone();
+    std::thread::spawn(move || {
+        let snap = build_game_snapshot(&source).unwrap_or_default();
+        let _ = sender.send(IsoLoaderMsg::GameDataLoaded(Box::new(snap)));
+    });
+}
+
+/// Decode the game-data tables into a browser snapshot (English pak + hangar pak).
+#[cfg(not(target_arch = "wasm32"))]
+fn build_game_snapshot(source: &SourceKind) -> Option<GameSnapshot> {
+    use sylpheed_formats::{game_data as gd, localization::TextIndex};
+    let main = read_pak_archive_blocking(source, "dat/GP_MAIN_GAME_E.pak").ok()?;
+    let text = TextIndex::build(&main);
+
+    let mut weapons = gd::load_weapons(&main);
+    weapons.sort_by(|a, b| a.id.cmp(&b.id));
+    let mut craft = gd::load_units(&main);
+    craft.sort_by(|a, b| a.id.cmp(&b.id));
+    let mut vessels = gd::load_vessels(&main);
+    vessels.sort_by(|a, b| a.id.cmp(&b.id));
+
+    let mut characters: Vec<CharRow> = gd::load_characters(&main)
+        .into_iter()
+        .filter_map(|c| {
+            let id = c.id?;
+            let short = id.trim_start_matches("Character").to_string();
+            let name = text.character_name(&short).unwrap_or(&short).to_string();
+            Some(CharRow { name, faction: c.faction.unwrap_or_default(), faces: c.faces.len() })
+        })
+        .collect();
+    characters.sort_by(|a, b| (a.faction.clone(), a.name.clone()).cmp(&(b.faction.clone(), b.name.clone())));
+
+    // Combat rosters, keyed by stage where the table self-identifies.
+    let rosters = gd::load_unit_rosters(&main);
+    let stat_hp = |id: &str| -> Option<f32> {
+        craft.iter().find(|u| u.id.as_deref() == Some(id)).and_then(|u| u.hp)
+            .or_else(|| vessels.iter().find(|v| v.id.as_deref() == Some(id)).and_then(|v| v.hp))
+    };
+    let mut missions: Vec<MissionRow> = Vec::new();
+    for s in gd::load_stages(&main) {
+        // main + extra story stages only (skip the Test stage)
+        if s.id.len() != 3 || !s.id.starts_with('S') || s.id[1..].parse::<u32>().is_err() {
+            continue;
+        }
+        let objectives: Vec<String> =
+            (1..=s.phases).flat_map(|p| text.objectives(&s.id, p)).map(str::to_string).collect();
+        let lose: Vec<String> =
+            (1..=s.phases).flat_map(|p| text.lose_conditions(&s.id, p)).map(str::to_string).collect();
+        let enemies: Vec<String> = rosters
+            .iter()
+            .find(|r| r.stage.as_deref() == Some(s.id.as_str()))
+            .map(|r| {
+                r.units.iter().filter(|u| u.contains("ADAN")).map(|u| {
+                    let name = u.trim_start_matches("UN_").splitn(3, '_').nth(2).unwrap_or(u).replace('_', " ");
+                    match stat_hp(u) {
+                        Some(h) => format!("{name}  ({h:.0} HP)"),
+                        None => name,
+                    }
+                }).collect()
+            })
+            .unwrap_or_default();
+        missions.push(MissionRow {
+            id: s.id.clone(),
+            location: s.location.unwrap_or_default().replace('_', " "),
+            phases: s.phases,
+            objectives,
+            lose,
+            enemies,
+        });
+    }
+    missions.sort_by(|a, b| a.id.cmp(&b.id));
+
+    // Arsenal + flights from the hangar pak (optional).
+    let (arsenal, flights) = read_pak_archive_blocking(source, "dat/GP_HANGAR_ARSENAL.pak")
+        .map(|h| {
+            let arsenal = gd::load_arsenal(&h);
+            let mut seen = std::collections::BTreeSet::new();
+            let mut flights = Vec::new();
+            for r in gd::load_pilot_rosters(&h) {
+                let key: String = r.pilots.iter().map(|(c, p)| format!("{c}:{p}")).collect::<Vec<_>>().join(",");
+                if seen.insert(key) {
+                    flights.push(r.pilots);
+                }
+            }
+            (arsenal, flights)
+        })
+        .unwrap_or_default();
+
+    Some(GameSnapshot { weapons, craft, vessels, characters, missions, arsenal, flights })
+}
+
 /// Handles a [`RequestVoiceLibrary`]: reads `tables.pak`'s `sounds.tbl` and
 /// enumerates the voice clips off-thread.
 #[cfg(not(target_arch = "wasm32"))]