Grab navimesh paths from LVB, warn when navimesh is missing

Of course we don't even generate the navimeshes to begin with, but
it's a start.

Cargo.lock

@@ -1060,7 +1060,7 @@ checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 [[package]]
 name = "physis"
 version = "0.5.0"
-source = "git+https://github.com/redstrate/physis#c0d3df99c36e1c3aedc8fd203192df556eddcc29"
+source = "git+https://github.com/redstrate/physis#b3196219d2f4618383eba1c6c0a79a1a2dadf954"
 dependencies = [
  "binrw",
  "bitflags",

src/config.rs

@@ -375,6 +375,10 @@ pub struct FilesystemConfig {
     /// If the directory is not specified, Kawari won't save file contents.
     #[serde(default)]
     pub unpack_path: String,
+
+    /// Navimesh file directory.
+    #[serde(default)]
+    pub navimesh_path: String,
 }
 
 /// Global and all-encompassing config.

src/world/zone.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use icarus::TerritoryType::TerritoryTypeSheet;
 use physis::{
     common::Language,
@@ -8,7 +10,10 @@ use physis::{
     resource::Resource,
 };
 
-use crate::common::{GameData, TerritoryNameKind};
+use crate::{
+    common::{GameData, TerritoryNameKind},
+    config::get_config,
+};
 
 /// Represents a loaded zone
 #[derive(Default, Debug)]
@@ -19,6 +24,7 @@ pub struct Zone {
     pub place_name: String,
     pub intended_use: u8,
     pub layer_groups: Vec<LayerGroup>,
+    pub navimesh_path: String,
 }
 
 impl Zone {
@@ -43,6 +49,21 @@ impl Zone {
         let lgb_file = game_data.resource.read(&path).unwrap();
         let lgb = Lvb::from_existing(&lgb_file).unwrap();
 
+        for layer_set in &lgb.scns[0].unk3.unk2 {
+            // FIXME: this is wrong. I think there might be multiple, separate navimeshes in really big zones but I'm not sure yet.
+            zone.navimesh_path = layer_set.path_nvm.replace("/server/data/", "").to_string();
+        }
+
+        let config = get_config();
+        if config.filesystem.navimesh_path.is_empty() {
+            tracing::warn!("Navimesh path is not set! Monsters will not function correctly!");
+        } else {
+            let mut nvm_path = PathBuf::from(config.filesystem.navimesh_path);
+            nvm_path.push(&zone.navimesh_path);
+
+            Self::load_navimesh(&nvm_path.to_str().unwrap());
+        }
+
         let mut load_lgb = |path: &str| -> Option<LayerGroup> {
             let lgb_file = game_data.resource.read(path)?;
             tracing::info!("Loading {path}");
@@ -116,4 +137,14 @@ impl Zone {
 
         None
     }
+
+    // TODO: add better error handling here
+    fn load_navimesh(path: &str) -> Option<()> {
+        if !std::fs::exists(path).unwrap_or_default() {
+            tracing::warn!("Navimesh {path} does not exist, monsters will not function correctly!");
+            return None;
+        }
+
+        Some(())
+    }
 }