add ability to delay $item until next drop on proxy

src/ChatCommands.cc

@@ -1224,17 +1224,25 @@ ChatCommandDefinition cc_item(
       a.check_cheats_enabled_or_allowed(s->cheat_flags.create_items);
 
       ItemData item;
+      bool was_enqueued = false;
       if (a.c->proxy_session) {
         if (a.c->version() == Version::BB_V4) {
           throw precondition_failed("$C6This command cannot\nbe used in proxy\nsessions in BB games");
         }
         a.check_is_leader();
 
-        item = s->parse_item_description(a.c->version(), a.text);
-        item.id = phosg::random_object<uint32_t>() | 0x80000000;
+        if (a.text.starts_with("!")) {
+          item = s->parse_item_description(a.c->version(), a.text.substr(1));
+          a.c->proxy_session->next_drop_item = item;
+          was_enqueued = true;
 
-        send_drop_stacked_item_to_channel(s, a.c->channel, item, a.c->floor, a.c->pos);
-        send_drop_stacked_item_to_channel(s, a.c->proxy_session->server_channel, item, a.c->floor, a.c->pos);
+        } else {
+          item = s->parse_item_description(a.c->version(), a.text);
+          item.id = phosg::random_object<uint32_t>() | 0x80000000;
+
+          send_drop_stacked_item_to_channel(s, a.c->channel, item, a.c->floor, a.c->pos);
+          send_drop_stacked_item_to_channel(s, a.c->proxy_session->server_channel, item, a.c->floor, a.c->pos);
+        }
 
       } else {
         auto l = a.c->require_lobby();
@@ -1251,7 +1259,11 @@ ChatCommandDefinition cc_item(
       }
 
       string name = s->describe_item(a.c->version(), item, ItemNameIndex::Flag::INCLUDE_PSO_COLOR_ESCAPES);
-      send_text_message(a.c, "$C7Item created:\n" + name);
+      if (was_enqueued) {
+        send_text_message(a.c, "$C7Next item:\n" + name);
+      } else {
+        send_text_message(a.c, "$C7Item created:\n" + name);
+      }
       co_return;
     });
 

src/ProxyCommands.cc

@@ -823,6 +823,21 @@ static asio::awaitable<HandlerResult> SC_6x60_6xA2(shared_ptr<Client> c, Channel
     co_return HandlerResult::FORWARD;
   }
 
+  G_SpecializableItemDropRequest_6xA2 cmd = normalize_drop_request(msg.data.data(), msg.data.size());
+
+  if (!c->proxy_session->next_drop_item.empty()) {
+    c->log.info_f("An override item is waiting; creating it");
+    auto s = c->require_server_state();
+    bool is_obj = (cmd.rt_index == 0x30);
+    c->proxy_session->next_drop_item.id = 0x06010000 | cmd.entity_index | (is_obj ? 0x4000 : 0x1000);
+    send_drop_item_to_channel(
+        s, c->channel, c->proxy_session->next_drop_item, is_obj ? 2 : 1, cmd.floor, cmd.pos, cmd.entity_index);
+    send_drop_item_to_channel(
+        s, c->proxy_session->server_channel, c->proxy_session->next_drop_item, is_obj ? 2 : 1, cmd.floor, cmd.pos, cmd.entity_index);
+    c->proxy_session->next_drop_item.clear();
+    co_return HandlerResult::SUPPRESS;
+  }
+
   switch (c->proxy_session->drop_mode) {
     case ProxyDropMode::DISABLED:
       co_return HandlerResult::SUPPRESS;
@@ -843,7 +858,6 @@ static asio::awaitable<HandlerResult> SC_6x60_6xA2(shared_ptr<Client> c, Channel
     co_return HandlerResult::FORWARD;
   }
 
-  G_SpecializableItemDropRequest_6xA2 cmd = normalize_drop_request(msg.data.data(), msg.data.size());
   auto rec = reconcile_drop_request_with_map(
       c, cmd, c->proxy_session->lobby_difficulty, c->proxy_session->lobby_event, c->proxy_session->map_state, false);
 

src/ProxySession.hh

@@ -58,6 +58,7 @@ struct ProxySession {
   // Note: We intentionally don't use the client's item ID space because the client may create items at the same time
   // as the proxy, so server/client state could go out of sync
   uint32_t next_item_id = 0x44000000;
+  ItemData next_drop_item;
 
   struct PersistentConfig {
     uint32_t account_id;