start implementing ChatDB.advance_chat()

src/chat.rs

@@ -16,8 +16,10 @@ impl Plugin for ChatPlugin {
         app.add_systems(Startup, load_chats);
         app.add_systems(Update, (
             handle_new_conversations,
+            handle_chat_events.after(handle_new_conversations),
         ));
         app.add_event::<StartConversationEvent>();
+        app.add_event::<ChatEvent>();
         app.insert_resource(ChatDB(Vec::new()));
     }
 }
@@ -29,6 +31,9 @@ pub struct Chat {
     pub timer: f64,
 }
 
+#[derive(Component)]
+pub struct Choice;
+
 #[derive(Resource)]
 pub struct ChatDB(Vec<Yaml>);
 impl ChatDB {
@@ -49,6 +54,10 @@ impl ChatDB {
         }
         return Err(format!("No chat with the conversation ID `{id}` was found."));
     }
+    pub fn advance_chat(&self, chat: &mut Chat, event: &mut EventWriter<ChatEvent>) {
+        event.send(ChatEvent::DespawnAllChoices);
+        chat.position += 1;
+    }
 }
 
 #[derive(Component)]
@@ -64,6 +73,14 @@ pub struct StartConversationEvent {
     pub talker: Talker,
 }
 
+#[derive(Event)]
+pub enum ChatEvent {
+    DespawnAllChoices,
+    //ShowMessage(String),
+    //SpawnChoice(String),
+    //Script(String, String, String),
+}
+
 pub fn load_chats(mut chatdb: ResMut<ChatDB>) {
     for chat_yaml in CHATS {
         if let Ok(mut yaml_data) = YamlLoader::load_from_str(chat_yaml) {
@@ -78,24 +95,27 @@ pub fn handle_new_conversations(
     mut commands: Commands,
     mut er_conv: EventReader<StartConversationEvent>,
     mut ew_sfx: EventWriter<audio::PlaySfxEvent>,
+    mut ew_chatevent: EventWriter<ChatEvent>,
     chatdb: Res<ChatDB>,
     q_chats: Query<&Chat>,
     time: Res<Time>,
 ) {
+    for event in er_conv.read() {
         if !q_chats.is_empty() {
             ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Ping));
             return;
         }
-    for event in er_conv.read() {
         match (*chatdb).get_chat_by_id(&event.talker.conv_id) {
             Ok(chat_id) => {
                 ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Ping));
-                commands.spawn((
-                    Chat {
+                let mut chat = Chat {
                     id: chat_id,
                     position: 1, // not 0, since the first item is always the chat name
                     timer: time.elapsed_seconds_f64(),
-                    },
+                };
+                chatdb.advance_chat(&mut chat, &mut ew_chatevent);
+                commands.spawn((
+                    chat,
                     world::DespawnOnPlayerDeath,
                 ));
             }
@@ -105,3 +125,19 @@ pub fn handle_new_conversations(
         }
     }
 }
+
+pub fn handle_chat_events(
+    mut commands: Commands,
+    mut er_chatevent: EventReader<ChatEvent>,
+    q_choices: Query<Entity, With<Choice>>,
+) {
+    for event in er_chatevent.read() {
+        match event {
+            ChatEvent::DespawnAllChoices => {
+                for entity in &q_choices {
+                    commands.entity(entity).despawn();
+                }
+            }
+        }
+    }
+}