handle charge attack packet. works for regular weapons and vjaya (#179)

Co-authored-by: Andy Newjack <andynewjack@protonmail.com>

src/ship/packet/handler/message.rs

@@ -192,3 +192,21 @@ pub fn update_player_position(id: ClientId,
     } else {}
     Ok(Box::new(None.into_iter()))
 }
+
+pub async fn charge_attack<EG>(id: ClientId,
+                        charge: &ChargeAttack,
+                        clients: &mut Clients,
+                        entity_gateway: &mut EG)
+                        -> Result<Box<dyn Iterator<Item = (ClientId, SendShipPacket)> + Send>, ShipError>
+where
+    EG: EntityGateway
+{
+    let client = clients.get_mut(&id).ok_or(ShipError::ClientNotFound(id))?;
+    if client.character.meseta >= charge.meseta {
+        client.character.meseta -= charge.meseta;
+        entity_gateway.save_character(&client.character).await;
+        Ok(Box::new(None.into_iter()))
+    } else {
+        Err(ShipError::NotEnoughMeseta(id, client.character.meseta))
+    }
+}

src/ship/ship.rs

@@ -57,6 +57,7 @@ pub enum ShipError {
     InvalidQuest(u32),
     InvalidQuestFilename(String),
     IoError(#[from] std::io::Error),
+    NotEnoughMeseta(ClientId, u32),
 }
 
 #[derive(Debug)]
@@ -289,6 +290,9 @@ impl<EG: EntityGateway> ShipServerState<EG> {
             GameMessage::PlayerWarped(_) | GameMessage::PlayerChangedFloor(_) | GameMessage::InitializeSpeechNpc(_) => {
                 handler::message::update_player_position(id, &msg.msg, &mut self.clients, &mut self.client_location, &self.rooms)
             },
+            GameMessage::ChargeAttack(charge_attack) => {
+                handler::message::charge_attack(id, charge_attack, &mut self.clients, &mut self.entity_gateway).await
+            },
             _ => {
                 let cmsg = msg.clone();
                 Ok(Box::new(self.client_location.get_client_neighbors(id).unwrap().into_iter()