1 files changed, 353 insertions, 0 deletions
diff --git a/apps/fparkan-viewer/src/main.rs b/apps/fparkan-viewer/src/main.rs
new file mode 100644
index 0000000..1720cd7
--- /dev/null
+++ b/apps/fparkan-viewer/src/main.rs
@@ -0,0 +1,353 @@
+#![forbid(unsafe_code)]
+#![allow(clippy::print_stderr, clippy::print_stdout)]
+//! `FParkan` asset viewer composition root.
+
+use fparkan_msh::{decode_msh, validate_msh};
+use fparkan_nres::{decode as decode_nres, ReadProfile as NresReadProfile};
+use fparkan_render::{
+    build_commands, CameraSnapshot, DrawId, GpuMaterialId, GpuMeshId, IndexRange, RenderPhase,
+    RenderProfile, RenderSnapshot, RenderSnapshotDraw,
+};
+use fparkan_resource::{archive_path, resource_name, CachedResourceRepository, ResourceRepository};
+use fparkan_terrain_format::{decode_land_map, decode_land_msh};
+use fparkan_texm::decode_texm;
+use fparkan_vfs::DirectoryVfs;
+use std::fmt::Write;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+fn main() {
+    let args = std::env::args().skip(1).collect::<Vec<_>>();
+    let code = match run(&args) {
+        Ok(json) => {
+            println!("{json}");
+            0
+        }
+        Err(err) => {
+            eprintln!("{err}");
+            2
+        }
+    };
+    std::process::exit(code);
+}
+
+fn run(args: &[String]) -> Result<String, String> {
+    match args {
+        [domain, rest @ ..] if domain == "archive" => inspect_archive(rest),
+        [domain, rest @ ..] if domain == "model" => inspect_model(rest),
+        [domain, rest @ ..] if domain == "texture" => inspect_texture(rest),
+        [domain, rest @ ..] if domain == "map" => inspect_map(rest),
+        _ => Err(usage()),
+    }
+}
+
+fn inspect_archive(args: &[String]) -> Result<String, String> {
+    let file = parse_file(args)?;
+    let limit = parse_limit(args)?;
+    let bytes = std::fs::read(&file).map_err(|err| format!("{}: {err}", file.display()))?;
+    if bytes.starts_with(b"NRes") {
+        let document = decode_nres(
+            Arc::from(bytes.into_boxed_slice()),
+            NresReadProfile::Compatible,
+        )
+        .map_err(|err| err.to_string())?;
+        let sample = render_nres_entries(&document, limit);
+        return Ok(format!(
+            "{{\"kind\":\"NRes\",\"path\":{},\"entries\":{},\"lookup_order_valid\":{},\"sample\":[{}]}}",
+            json_string(&file.display().to_string()),
+            document.entries().len(),
+            document.lookup_order_valid(),
+            sample
+        ));
+    }
+    if bytes.get(0..4) == Some(b"NL\0\x01") {
+        let document = fparkan_rsli::decode(
+            Arc::from(bytes.into_boxed_slice()),
+            fparkan_rsli::ReadProfile::Compatible,
+        )
+        .map_err(|err| err.to_string())?;
+        return Ok(format!(
+            "{{\"kind\":\"RsLi\",\"path\":{},\"entries\":{}}}",
+            json_string(&file.display().to_string()),
+            document.entries().len()
+        ));
+    }
+    Err(format!("{}: unsupported archive magic", file.display()))
+}
+
+fn inspect_model(args: &[String]) -> Result<String, String> {
+    if let Some(fixture) = parse_option(args, &["--fixture"]) {
+        return ViewerModelService::inspect_synthetic_model(&fixture);
+    }
+
+    let query = parse_resource_query(args)?;
+    let bytes = read_resource(&query)?;
+    let nested = decode_nres(bytes, NresReadProfile::Compatible).map_err(|err| err.to_string())?;
+    let document = decode_msh(&nested).map_err(|err| err.to_string())?;
+    let model = validate_msh(&document).map_err(|err| err.to_string())?;
+
+    Ok(format!(
+        "{{\"kind\":\"model\",\"archive\":{},\"name\":{},\"streams\":{},\"nodes\":{},\"slots\":{},\"positions\":{},\"indices\":{},\"batches\":{}}}",
+        json_string(&query.archive),
+        json_string(&query.name),
+        document.streams().len(),
+        model.node_count,
+        model.slots.len(),
+        model.positions.len(),
+        model.indices.len(),
+        model.batches.len()
+    ))
+}
+
+#[derive(Clone, Debug)]
+struct ViewerModelService;
+
+impl ViewerModelService {
+    fn inspect_synthetic_model(fixture: &str) -> Result<String, String> {
+        if fixture != "synthetic/model-basic" {
+            return Err(format!("unknown model fixture: {fixture}"));
+        }
+
+        let snapshot = RenderSnapshot {
+            camera: CameraSnapshot::default(),
+            draws: vec![RenderSnapshotDraw {
+                id: DrawId(1),
+                phase: RenderPhase::Opaque,
+                object_id: None,
+                mesh: GpuMeshId(1),
+                material_slots: vec![GpuMaterialId(7)],
+                material_index: 0,
+                transform: identity_transform(),
+                range: IndexRange { start: 0, count: 3 },
+                stable_order: 0,
+            }],
+        };
+        let commands = build_commands(&snapshot, RenderProfile::default())
+            .map_err(|err| format!("render command generation: {err}"))?;
+        let draw_commands = commands
+            .commands
+            .iter()
+            .filter(|command| matches!(command, fparkan_render::RenderCommand::Draw(_)))
+            .count();
+
+        Ok(format!(
+            "{{\"kind\":\"model\",\"fixture\":{},\"service\":\"synthetic-model\",\"draw_commands\":{draw_commands}}}",
+            json_string(fixture)
+        ))
+    }
+}
+
+fn inspect_texture(args: &[String]) -> Result<String, String> {
+    let query = parse_resource_query(args)?;
+    let document = decode_texm(read_resource(&query)?).map_err(|err| err.to_string())?;
+
+    Ok(format!(
+        "{{\"kind\":\"texture\",\"archive\":{},\"name\":{},\"width\":{},\"height\":{},\"format\":{},\"mips\":{},\"pages\":{}}}",
+        json_string(&query.archive),
+        json_string(&query.name),
+        document.width(),
+        document.height(),
+        json_string(&format!("{:?}", document.format())),
+        document.mip_count(),
+        document.page_rects().len()
+    ))
+}
+
+fn inspect_map(args: &[String]) -> Result<String, String> {
+    let file = parse_file(args)?;
+    let kind = parse_option(args, &["--kind"]).ok_or_else(|| "missing --kind".to_string())?;
+    let bytes = std::fs::read(&file).map_err(|err| format!("{}: {err}", file.display()))?;
+    let nres = decode_nres(
+        Arc::from(bytes.into_boxed_slice()),
+        NresReadProfile::Compatible,
+    )
+    .map_err(|err| err.to_string())?;
+
+    match kind.as_str() {
+        "land-msh" => {
+            let land = decode_land_msh(&nres).map_err(|err| err.to_string())?;
+            Ok(format!(
+                "{{\"kind\":\"land-msh\",\"path\":{},\"streams\":{},\"positions\":{},\"faces\":{},\"slots\":{}}}",
+                json_string(&file.display().to_string()),
+                land.streams.len(),
+                land.positions.len(),
+                land.faces.len(),
+                land.slots.slots_raw.len()
+            ))
+        }
+        "land-map" => {
+            let land = decode_land_map(&nres).map_err(|err| err.to_string())?;
+            Ok(format!(
+                "{{\"kind\":\"land-map\",\"path\":{},\"areals\":{},\"declared_areals\":{},\"grid_width\":{},\"grid_height\":{}}}",
+                json_string(&file.display().to_string()),
+                land.areals.len(),
+                land.areal_count,
+                land.grid.cells_x,
+                land.grid.cells_y
+            ))
+        }
+        _ => Err(format!("unknown map kind: {kind}")),
+    }
+}
+
+struct ResourceQuery {
+    root: PathBuf,
+    archive: String,
+    name: String,
+}
+
+fn parse_resource_query(args: &[String]) -> Result<ResourceQuery, String> {
+    Ok(ResourceQuery {
+        root: parse_path_option(args, &["--root", "--game-root"], "--root")?,
+        archive: parse_option(args, &["--archive"])
+            .ok_or_else(|| "missing --archive".to_string())?,
+        name: parse_option(args, &["--name"]).ok_or_else(|| "missing --name".to_string())?,
+    })
+}
+
+fn read_resource(query: &ResourceQuery) -> Result<Arc<[u8]>, String> {
+    let repository = CachedResourceRepository::new(Arc::new(DirectoryVfs::new(&query.root)));
+    let archive = repository
+        .open_archive(&archive_path(query.archive.as_bytes()).map_err(|err| err.to_string())?)
+        .map_err(|err| err.to_string())?;
+    let entry = repository
+        .find(archive, &resource_name(query.name.as_bytes()))
+        .map_err(|err| err.to_string())?
+        .ok_or_else(|| format!("resource not found: {}/{}", query.archive, query.name))?;
+    let bytes = repository.read(entry).map_err(|err| err.to_string())?;
+    Ok(Arc::from(bytes.into_owned()))
+}
+
+fn parse_file(args: &[String]) -> Result<PathBuf, String> {
+    parse_path_option(args, &["--file"], "--file")
+}
+
+fn parse_limit(args: &[String]) -> Result<usize, String> {
+    parse_option(args, &["--limit"])
+        .map(|value| {
+            value
+                .parse::<usize>()
+                .map_err(|_| format!("invalid --limit: {value}"))
+        })
+        .transpose()
+        .map(|value| value.unwrap_or(0))
+}
+
+fn render_nres_entries(document: &fparkan_nres::NresDocument, limit: usize) -> String {
+    let mut out = String::new();
+    for (index, entry) in document.entries().iter().take(limit).enumerate() {
+        if index > 0 {
+            out.push(',');
+        }
+        let name = String::from_utf8_lossy(entry.name_bytes());
+        let _ = write!(
+            out,
+            "{{\"name\":{},\"type\":{},\"size\":{}}}",
+            json_string(&name),
+            entry.meta().type_id,
+            entry.meta().data_size
+        );
+    }
+    out
+}
+
+fn parse_path_option(args: &[String], names: &[&str], label: &str) -> Result<PathBuf, String> {
+    parse_option(args, names)
+        .map(PathBuf::from)
+        .ok_or_else(|| format!("missing {label}"))
+}
+
+fn parse_option(args: &[String], names: &[&str]) -> Option<String> {
+    let mut iter = args.iter();
+    while let Some(arg) = iter.next() {
+        if names.iter().any(|name| arg == name) {
+            return iter.next().cloned();
+        }
+    }
+    None
+}
+
+fn json_string(value: &str) -> String {
+    let mut out = String::with_capacity(value.len() + 2);
+    out.push('"');
+    for ch in value.chars() {
+        match ch {
+            '"' => out.push_str("\\\""),
+            '\\' => out.push_str("\\\\"),
+            '\n' => out.push_str("\\n"),
+            '\r' => out.push_str("\\r"),
+            '\t' => out.push_str("\\t"),
+            c if c.is_control() => {
+                let _ = write!(out, "\\u{:04x}", u32::from(c));
+            }
+            c => out.push(c),
+        }
+    }
+    out.push('"');
+    out
+}
+
+fn identity_transform() -> [f32; 16] {
+    [
+        1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0,
+    ]
+}
+
+fn usage() -> String {
+    "usage: fparkan-viewer archive --file <archive> [--limit N] | model --root <game-root> --archive <archive> --name <msh> | model --fixture synthetic/model-basic | texture --root <game-root> --archive <archive> --name <texm> | map --file <Land.msh|Land.map> --kind land-msh|land-map".to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn strings(values: &[&str]) -> Vec<String> {
+        values.iter().map(|value| (*value).to_string()).collect()
+    }
+
+    #[test]
+    fn parses_resource_query() -> Result<(), String> {
+        let query = parse_resource_query(&strings(&[
+            "--root",
+            "testdata/IS",
+            "--archive",
+            "textures.lib",
+            "--name",
+            "grass.tex",
+        ]))?;
+
+        assert_eq!(query.root, PathBuf::from("testdata/IS"));
+        assert_eq!(query.archive, "textures.lib");
+        assert_eq!(query.name, "grass.tex");
+        Ok(())
+    }
+
+    #[test]
+    fn json_string_escapes_controls() {
+        assert_eq!(json_string("a\"b\\c\n"), "\"a\\\"b\\\\c\\n\"");
+    }
+
+    #[test]
+    fn usage_rejects_empty_args() {
+        assert_eq!(run(&[]), Err(usage()));
+    }
+
+    #[test]
+    fn parses_limit() {
+        assert_eq!(parse_limit(&strings(&["--limit", "2"])), Ok(2));
+        assert_eq!(parse_limit(&[]), Ok(0));
+        assert_eq!(
+            parse_limit(&strings(&["--limit", "x"])),
+            Err("invalid --limit: x".to_string())
+        );
+    }
+
+    #[test]
+    fn model_fixture_uses_viewer_service_and_render_commands() -> Result<(), String> {
+        assert_eq!(
+            run(&strings(&["model", "--fixture", "synthetic/model-basic"]))?,
+            "{\"kind\":\"model\",\"fixture\":\"synthetic/model-basic\",\"service\":\"synthetic-model\",\"draw_commands\":1}"
+        );
+        Ok(())
+    }
+}