From d4a6a56a27a026be75fe278230883e0338020e30 Mon Sep 17 00:00:00 2001
From: Ethan O'Brien <ethan.a.obrien@gmail.com>
Date: Sun, 28 Jun 2026 19:15:24 -0500
Subject: [PATCH] Add ability to pass JSON args to backend

---
 src/android.rs | 19 +++++++++-------
 src/options.rs |  4 +++-
 src/runtime.rs | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/src/android.rs b/src/android.rs
index 70b6ac5..4d38d0e 100644
--- a/src/android.rs
+++ b/src/android.rs
@@ -1,6 +1,6 @@
 use jni::JNIEnv;
 use jni::objects::{JClass};
-use jni::sys::{jstring, jboolean};
+use jni::sys::jstring;
 use std::thread;
 use std::sync::Once;
 use jni::objects::JString;
@@ -43,14 +43,12 @@ fn android_init() {
 extern "C" fn Java_one_ethanthesleepy_androidew_BackgroundService_startServer<'local>(
     mut env: JNIEnv<'local>,
     _class: JClass<'local>,
-    data_path: JString<'local>,
-    easter: jboolean
+    config: JString<'local>,
 ) -> jstring {
     android_init();
-    crate::runtime::set_easter_mode(easter != 0);
 
-    let data_path: String = env.get_string(&data_path).unwrap().into();
-    crate::runtime::update_data_path(&data_path);
+    let config: String = env.get_string(&config).unwrap().into();
+    crate::runtime::apply_config_json(&config);
 
     let output = env.new_string(String::from("Azunyannnn~")).unwrap();
     thread::spawn(|| {
@@ -70,7 +68,12 @@ extern "C" fn Java_one_ethanthesleepy_androidew_BackgroundService_stopServer<'lo
 
 
 #[unsafe(no_mangle)]
-extern "C" fn Java_one_ethanthesleepy_androidew_BackgroundService_setEasterMode<'local>(_env: JNIEnv<'local>, _class: JClass<'local>, easter: jboolean) {
+extern "C" fn Java_one_ethanthesleepy_androidew_BackgroundService_updateConfig<'local>(
+    mut env: JNIEnv<'local>,
+    _class: JClass<'local>,
+    config: JString<'local>,
+) {
     android_init();
-    crate::runtime::set_easter_mode(easter != 0);
+    let config: String = env.get_string(&config).unwrap().into();
+    crate::runtime::apply_config_json(&config);
 }
diff --git a/src/options.rs b/src/options.rs
index 8707e9d..eb3fe8c 100644
--- a/src/options.rs
+++ b/src/options.rs
@@ -76,5 +76,7 @@ pub struct Args {
 }
 
 pub fn get_args() -> Args {
-    Args::parse()
+    let mut args = Args::parse();
+    crate::runtime::overlay_args(&mut args);
+    args
 }
diff --git a/src/runtime.rs b/src/runtime.rs
index 7495b39..3b2b474 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -11,6 +11,18 @@ lazy_static! {
     static ref MASTERDATA_WARNED: Mutex<HashSet<String>> = Mutex::new(HashSet::new());
     static ref MOD_PATHS: RwLock<Vec<String>> = RwLock::new(Vec::new());
     static ref EASTER: RwLock<bool> = RwLock::new(false);
+    static ref HOST_CONFIG: RwLock<HostConfig> = RwLock::new(HostConfig::default());
+}
+
+// This is used by an embedding app in lib mode
+#[derive(Default, Clone)]
+pub struct HostConfig {
+    pub assets_url: String,
+    pub npps4: String,
+    pub max_time: u64,
+    pub port: u16,
+    pub jp_android_asset_hash: String,
+    pub en_android_asset_hash: String,
 }
 
 pub fn set_running(running: bool) {
@@ -116,3 +128,50 @@ pub fn read_mod_files(rel_path: &str) -> Vec<(String, Vec<u8>)> {
     }
     out
 }
+
+pub fn apply_config_json(json: &str) {
+    let parsed = match jzon::parse(json) {
+        Ok(p) => p,
+        Err(e) => {
+            println!("Ignoring invalid host config json: {}", e);
+            return;
+        }
+    };
+
+    if let Some(v) = parsed["dataPath"].as_str() {
+        if !v.is_empty() {
+            update_data_path(v);
+        }
+    }
+    set_easter_mode(parsed["easterMode"].as_bool().unwrap_or(false));
+
+    let s = |key: &str| parsed[key].as_str().unwrap_or("").to_string();
+    let mut cfg = HOST_CONFIG.write().unwrap();
+    cfg.assets_url = s("assetsUrl");
+    cfg.npps4 = s("npps4");
+    cfg.max_time = parsed["maxTime"].as_u64().unwrap_or(0);
+    cfg.port = parsed["port"].as_u64().unwrap_or(0) as u16;
+    cfg.jp_android_asset_hash = s("jpAndroidAssetHash");
+    cfg.en_android_asset_hash = s("enAndroidAssetHash");
+}
+
+pub fn overlay_args(args: &mut crate::options::Args) {
+    let cfg = HOST_CONFIG.read().unwrap();
+    macro_rules! overlay_str {
+        ($field:ident) => {
+            if !cfg.$field.is_empty() {
+                args.$field = cfg.$field.clone();
+            }
+        };
+    }
+    overlay_str!(assets_url);
+    overlay_str!(npps4);
+    if cfg.max_time != 0 {
+        args.max_time = cfg.max_time;
+    }
+    if cfg.port != 0 {
+        args.port = cfg.port;
+    }
+    overlay_str!(jp_android_asset_hash);
+    overlay_str!(en_android_asset_hash);
+}