Refactor azalea-client (#205)

* start organizing packet_handling more by moving packet handlers into their own functions

* finish writing all the handler functions for packets

* use macro for generating match statement for packet handler functions

* fix set_entity_data

* update config state to also use handler functions

* organize az-client file structure by moving things into plugins directory

* fix merge issues

1 files changed, 63 insertions, 0 deletions

diff --git a/azalea-client/src/plugins/brand.rs b/azalea-client/src/plugins/brand.rs
new file mode 100644
index 00000000..e15a6c67
--- /dev/null
+++ b/azalea-client/src/plugins/brand.rs
@@ -0,0 +1,63 @@
+use azalea_buf::AzaleaWrite;
+use azalea_core::resource_location::ResourceLocation;
+use azalea_protocol::{
+    common::client_information::ClientInformation,
+    packets::config::{
+        s_client_information::ServerboundClientInformation,
+        s_custom_payload::ServerboundCustomPayload,
+    },
+};
+use bevy_app::prelude::*;
+use bevy_ecs::prelude::*;
+use tracing::{debug, warn};
+
+use super::packet::config::SendConfigPacketEvent;
+use crate::packet::login::InLoginState;
+
+pub struct BrandPlugin;
+impl Plugin for BrandPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(
+            Update,
+            handle_end_login_state.before(crate::packet::config::handle_send_packet_event),
+        );
+    }
+}
+
+fn handle_end_login_state(
+    mut removed: RemovedComponents<InLoginState>,
+    query: Query<&ClientInformation>,
+    mut send_packet_events: EventWriter<SendConfigPacketEvent>,
+) {
+    for entity in removed.read() {
+        let mut brand_data = Vec::new();
+        // azalea pretends to be vanilla everywhere else so it makes sense to lie here
+        // too
+        "vanilla".azalea_write(&mut brand_data).unwrap();
+        send_packet_events.send(SendConfigPacketEvent::new(
+            entity,
+            ServerboundCustomPayload {
+                identifier: ResourceLocation::new("brand"),
+                data: brand_data.into(),
+            },
+        ));
+
+        let client_information = match query.get(entity).ok() {
+            Some(i) => i,
+            None => {
+                warn!(
+                    "ClientInformation component was not set before leaving login state, using a default"
+                );
+                &ClientInformation::default()
+            }
+        };
+
+        debug!("Writing ClientInformation while in config state: {client_information:?}");
+        send_packet_events.send(SendConfigPacketEvent::new(
+            entity,
+            ServerboundClientInformation {
+                information: client_information.clone(),
+            },
+        ));
+    }
+}