diff --git a/src/game.rs b/src/game.rs
index 35b5e50..adeb5fd 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -2,7 +2,7 @@ use bevy::prelude::*;
 
 use crate::{
     game::{
-        hand::Hand,
+        hand::{Hand, Pond},
         player::{CurrentPlayer, MainPlayer},
         round::{TurnState, Wind},
         wall::Wall,
@@ -27,6 +27,17 @@ pub enum GameState {
 #[derive(Message)]
 pub enum GameMessage {
     Discarded(Entity),
+    CallPending,
+    Called { player: Entity, calltype: Entity },
+}
+
+impl GameMessage {
+    pub(crate) fn is_called(&self) -> bool {
+        match self {
+            GameMessage::Called { .. } => true,
+            _ => false,
+        }
+    }
 }
 
 pub struct Riichi;
@@ -47,10 +58,9 @@ impl Plugin for Riichi {
             .add_systems(OnEnter(TurnState::Menzen), round::menzen)
             .add_systems(Update, round::riichi_kan.run_if(in_state(TurnState::RiichiKan)))
             .add_systems(Update, round::discard.run_if(in_state(TurnState::Discard)))
-            .add_systems(Update, round::debug_discard.run_if(in_state(TurnState::Discard)))
-            .add_systems(Update, round::ron_chi_pon_kan.run_if(in_state(TurnState::RonChiiPonKan)))
+            .add_systems(OnEnter(TurnState::RonChiiPonKan), round::notify_callable)
+            .add_systems(Update, round::ron_chi_pon_kan.run_if(in_state(TurnState::RonChiiPonKan)).after(round::notify_callable))
             .add_systems(OnEnter(TurnState::End), round::end)
-            // .add_systems(Update, systems)
             // semicolon stopper
             ;
     }
@@ -73,6 +83,7 @@ pub(crate) fn setup(
             player,
             points,
             Hand,
+            Pond,
             Wind::from_repr((i - 1) as usize).unwrap(),
         );
 
diff --git a/src/game/hand.rs b/src/game/hand.rs
index 0870043..9717d79 100644
--- a/src/game/hand.rs
+++ b/src/game/hand.rs
@@ -10,6 +10,9 @@ use crate::{
 #[derive(Component)]
 pub struct Hand;
 
+#[derive(Component)]
+pub struct Pond;
+
 #[derive(Component)]
 pub struct Drawn;
 
diff --git a/src/game/round.rs b/src/game/round.rs
index 698322e..4e35bb4 100644
--- a/src/game/round.rs
+++ b/src/game/round.rs
@@ -1,11 +1,13 @@
-use bevy::prelude::*;
+use std::rc::Weak;
+
+use bevy::{platform::collections::HashMap, prelude::*};
 use strum::{EnumCount, FromRepr};
 
 use crate::{
     EnumNextCycle,
     game::{
         GameMessage, GameState,
-        hand::{Discarded, Drawn, Hand},
+        hand::{Discarded, Drawn, Hand, Pond},
         player::{CurrentPlayer, Player},
         wall::Wall,
     },
@@ -58,6 +60,15 @@ pub(crate) enum TurnState {
     End,
 }
 
+#[derive(Component, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub(crate) enum CallType {
+    Skip,
+    Ron,
+    Chii,
+    Pon,
+    Kan,
+}
+
 impl Default for MatchSettings {
     fn default() -> Self {
         Self {
@@ -191,10 +202,45 @@ pub(crate) fn discard(
     Ok(())
 }
 
+#[derive(Resource)]
+pub struct PendingCalls {
+    eligible: Vec<Entity>,
+    calls: HashMap<Entity, CallType>,
+}
+
+pub(crate) fn notify_callable() {}
+
 pub(crate) fn ron_chi_pon_kan(
+    mut commands: Commands,
+    mut reader: MessageReader<GameMessage>,
+
+    discarded: Single<Entity, With<Discarded>>,
+    mut ponds: Query<(&Children, Entity), (With<Pond>, Without<Player>)>,
+    calls: Query<&CallType>,
+
     curr_turnstate: Res<State<TurnState>>,
     mut next_turnstate: ResMut<NextState<TurnState>>,
 ) {
+    // check if can call?
+    // message players?
+    // collect then prioritize
+
+    // let mut received = vec![];
+    let mut received: Vec<_> = reader
+        .read()
+        .filter_map(|m| {
+            if let GameMessage::Called { player, calltype } = m
+                && let Ok(calltype) = calls.get(*calltype)
+            {
+                Some((calltype, player))
+            } else {
+                None
+            }
+        })
+        .collect();
+    received.sort_unstable_by_key(|(c, t)| c);
+    // received.sort_unstable_by_key(|m| m.);
+
     next_turnstate.set(curr_turnstate.next());
 }