1 files changed, 121 insertions, 0 deletions
diff --git a/src/system.rs b/src/system.rs
new file mode 100644
index 0000000..e707d7f
--- /dev/null
+++ b/src/system.rs
@@ -0,0 +1,121 @@
+use std::{num::NonZeroUsize, str::FromStr};
+
+use std::sync::Arc;
+use tokio::task::JoinSet;
+use tokio::sync::Mutex;
+use twilight_http::Client;
+use twilight_model::id::{Id, marker::{MessageMarker, UserMarker}};
+use twilight_gateway::{Intents, Shard, ShardId};
+
+#[derive(Clone)]
+pub struct System {
+    pub config: crate::config::System,
+    pub message_dedup_cache: Arc<Mutex<lru::LruCache<Id<MessageMarker>, ()>>>,
+}
+
+impl System {
+    pub fn new(system_config: crate::config::System) -> Self {
+        System {
+            config: system_config,
+            message_dedup_cache: Arc::new(Mutex::new(lru::LruCache::new(NonZeroUsize::new(100).unwrap())))
+        }
+    }
+
+    pub async fn start_clients(&mut self) {
+        println!("Starting clients for system");
+
+        let reference_user_id : Id<UserMarker> = Id::from_str(self.config.reference_user_id.as_str())
+            .expect(format!("Invalid user ID: {}", self.config.reference_user_id).as_str());
+
+        let mut set = JoinSet::new();
+
+        for member in self.config.members.iter() {
+            let token = member.discord_token.clone();
+            let self_clone = self.clone();
+            set.spawn(async move {
+                println!("Starting client with token: {}", token);
+
+                let intents = Intents::GUILD_MEMBERS | Intents::GUILD_PRESENCES | Intents::GUILD_MESSAGES | Intents::MESSAGE_CONTENT;
+
+                let mut shard = Shard::new(ShardId::ONE, token.clone(), intents);
+                let mut client = Client::new(token.clone());
+
+                loop {
+                    let event = match shard.next_event().await {
+                        Ok(event) => event,
+                        Err(source) => {
+                            println!("error receiving event");
+
+                            if source.is_fatal() {
+                                break;
+                            }
+
+                            continue;
+                        }
+                    };
+
+                    match event {
+                        twilight_gateway::Event::Ready(client) => {
+                            println!("Bot started for {}#{}", client.user.name, client.user.discriminator);
+                        },
+
+                        twilight_gateway::Event::MessageCreate(message) => {
+                            if message.author.id != reference_user_id {
+                                continue
+                            }
+
+                            if self_clone.is_new_message(message.id).await {
+                                self_clone.handle_message_create(message, &mut client).await;
+                            }
+                        },
+
+                        twilight_gateway::Event::MessageUpdate(message) => {
+                            if message.author.is_none() || message.author.as_ref().unwrap().id != reference_user_id {
+                                continue
+                            }
+
+                            if self_clone.is_new_message(message.id).await {
+                                self_clone.handle_message_update(message, &mut client).await;
+                            }
+                        },
+
+                        _ => (),
+                    }
+                }
+            });
+        }
+
+        while let Some(join_result) = set.join_next().await {
+            if let Err(join_error) = join_result {
+                println!("Task encountered error: {}", join_error);
+            } else {
+                println!("Task joined cleanly");
+            }
+        }
+    }
+
+    async fn is_new_message(&self, message_id: Id<MessageMarker>) -> bool {
+        let mut message_cache = self.message_dedup_cache.lock().await;
+        if let None = message_cache.get(&message_id) {
+            message_cache.put(message_id, ());
+            true
+        } else {
+            false
+        }
+    }
+
+    async fn handle_message_create(&self, message: Box<twilight_model::gateway::payload::incoming::MessageCreate>, client: &mut Client) {
+        println!("Message created: {}", message.content);
+
+        if let Err(err) = client.create_message(message.channel_id)
+            .reply(message.id)
+            .content(&format!("Recognized message from authorized user {}", message.author.name)).expect("Error: reply too long")
+            .await {
+            println!("Error: {}", err);
+        }
+    }
+
+    async fn handle_message_update(&self, _message: Box<twilight_model::gateway::payload::incoming::MessageUpdate>, _client: &mut Client) {
+        // TODO: handle message edits and stuff
+    }
+}