diff --git a/Cargo.lock b/Cargo.lock
index 1417ad4..6d45978 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -461,16 +461,6 @@ dependencies = [
  "wyz",
 ]
 
-[[package]]
-name = "blart"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "220e5685b0a23b634e9215a69cfa9800e103ccd2f0134bd1a81cc9c584059701"
-dependencies = [
- "bytemuck",
- "paste",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -1453,11 +1443,11 @@ checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 name = "fomo-reducer"
 version = "0.1.0"
 dependencies = [
- "blart",
  "clap",
  "dashmap 6.1.0",
  "futures",
  "opendal",
+ "patricia_tree 0.10.1",
  "rhai",
  "rustls 0.23.35",
  "secrecy 0.10.3",
@@ -3599,12 +3589,6 @@ dependencies = [
  "windows-link",
 ]
 
-[[package]]
-name = "paste"
-version = "1.0.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
-
 [[package]]
 name = "patricia_tree"
 version = "0.8.0"
@@ -3614,6 +3598,12 @@ dependencies = [
  "bitflags 2.10.0",
 ]
 
+[[package]]
+name = "patricia_tree"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4df0e43512f12f23a6b08c7b893192b7d6ec937b95ee03af040847907fe5cef7"
+
 [[package]]
 name = "pbkdf2"
 version = "0.12.2"
@@ -5466,7 +5456,7 @@ dependencies = [
  "futures-core",
  "futures-util",
  "hls_m3u8",
- "patricia_tree",
+ "patricia_tree 0.8.0",
  "reqwest",
  "tokio",
  "tracing",
diff --git a/Cargo.toml b/Cargo.toml
index a486fd1..039e503 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-blart = "0.4.0"
 clap = { version = "4.5.40", features = ["derive", "env"] }
 dashmap = "6.1.0"
 futures = "0.3.32"
@@ -45,6 +44,7 @@ opendal = { git = "https://github.com/apache/opendal", features = [
     "services-sled",
     "services-webdav",
 ] }
+patricia_tree = "0.10.1"
 rhai = "1.23.6"
 rustls = "0.23"
 secrecy = { version = "0.10.3", features = ["serde"] }
diff --git a/src/command/join.rs b/src/command/join.rs
index 662be21..d871cc9 100644
--- a/src/command/join.rs
+++ b/src/command/join.rs
@@ -2,7 +2,7 @@ use std::sync::LazyLock;
 
 use twilight_model::application::{
     command::{Command, CommandType},
-    interaction::application_command::CommandData,
+    interaction::{Interaction, application_command::CommandData},
 };
 use twilight_util::builder::command::CommandBuilder;
 
@@ -19,6 +19,20 @@ pub static COMMAND: LazyLock<Command> = LazyLock::new(|| {
 });
 
 #[tracing::instrument]
-pub async fn handle(state: State, data: CommandData) {
-    todo!();
+pub async fn handle(state: State, interaction: Interaction) {
+    let vcs = state.vcs;
+
+    let guild_id = interaction.guild_id.expect("TODO");
+    // let user_id = data.user.map(|user| user.id).expect("TODO");
+
+    let user_id = interaction
+        .member
+        .and_then(|member| member.user.map(|user| user.id))
+        .expect("TODO");
+
+    let guild_vcs = vcs.get(&guild_id).expect("TODO");
+    tracing::error!(?guild_vcs, "TODO");
+
+    let user_in_vc_data = guild_vcs.get_left_and_data_for(&user_id);
+    tracing::error!(?user_in_vc_data, "TODO");
 }
diff --git a/src/command/leave.rs b/src/command/leave.rs
index 503ec5a..65315af 100644
--- a/src/command/leave.rs
+++ b/src/command/leave.rs
@@ -2,7 +2,7 @@ use std::sync::LazyLock;
 
 use twilight_model::application::{
     command::{Command, CommandType},
-    interaction::application_command::CommandData,
+    interaction::Interaction,
 };
 use twilight_util::builder::command::CommandBuilder;
 
@@ -19,6 +19,6 @@ pub static COMMAND: LazyLock<Command> = LazyLock::new(|| {
 });
 
 #[tracing::instrument]
-pub async fn handle(state: State, data: CommandData) {
+pub async fn handle(state: State, interaction: Interaction) {
     todo!();
 }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index a918518..ad0ce9a 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -1,14 +1,8 @@
-use std::{
-    ffi::{CStr, CString},
-    fmt::Debug,
-    sync::Arc,
-};
+use std::{fmt::Debug, sync::Arc};
 
-use blart::TreeMap;
 use futures::future::BoxFuture;
-use twilight_model::application::{
-    command::Command, interaction::application_command::CommandData,
-};
+use patricia_tree::StringPatriciaMap;
+use twilight_model::application::{command::Command, interaction::Interaction};
 
 use crate::VCs;
 
@@ -22,14 +16,14 @@ pub struct State {
 }
 
 type Return = ();
-type BoxedHandler = Box<dyn Fn(State, CommandData) -> BoxFuture<'static, Return>>;
+type BoxedHandler = Box<dyn Fn(State, Interaction) -> BoxFuture<'static, Return>>;
 
 fn box_handler<Handler, Fut>(handler: Handler) -> BoxedHandler
 where
     Fut: Future<Output = Return> + Send + 'static,
-    Handler: Fn(State, CommandData) -> Fut + 'static,
+    Handler: Fn(State, Interaction) -> Fut + 'static,
 {
-    Box::new(move |state, command_data| Box::pin(handler(state, command_data)))
+    Box::new(move |state, interaction| Box::pin(handler(state, interaction)))
 }
 
 pub fn all() -> Vec<(&'static Command, BoxedHandler)> {
@@ -42,32 +36,31 @@ pub fn all() -> Vec<(&'static Command, BoxedHandler)> {
 
 #[derive(Default)]
 pub struct Router {
-    map: TreeMap<CString, BoxedHandler>,
+    map: StringPatriciaMap<BoxedHandler>,
 }
 
 impl Router {
     fn add_route<'s, 'a, Fut, Handler>(&'s mut self, name: &'a str, handler: Handler)
     where
         Fut: Future<Output = Return> + Send + 'static,
-        Handler: Fn(State, CommandData) -> Fut + 'static,
+        Handler: Fn(State, Interaction) -> Fut + 'static,
     {
         self.add_route_already_boxed(name, box_handler(handler));
     }
 
     fn add_route_already_boxed<'s, 'a>(&'s mut self, name: &'a str, boxed_handler: BoxedHandler) {
-        self.map.insert(name.parse().unwrap(), boxed_handler);
+        self.map.insert(name, boxed_handler);
     }
 
-    pub async fn handle(&self, state: State, command_data: CommandData) -> Return {
-        let name = &command_data.name;
-        let key = CStr::from_bytes_with_nul(name.as_bytes()).unwrap();
+    pub async fn handle(
+        &self,
+        state: State,
+        command_name: &str,
+        interaction: Interaction,
+    ) -> Option<Return> {
+        let handler = self.map.get(command_name)?;
 
-        let handler = self
-            .map
-            .get(key)
-            .expect("asked to handle an inexistent command");
-
-        handler(state, command_data).await
+        Some(handler(state, interaction).await)
     }
 }
 
diff --git a/src/command/opt_out.rs b/src/command/opt_out.rs
index 137182e..489caf3 100644
--- a/src/command/opt_out.rs
+++ b/src/command/opt_out.rs
@@ -2,7 +2,7 @@ use std::sync::LazyLock;
 
 use twilight_model::application::{
     command::{Command, CommandType},
-    interaction::application_command::CommandData,
+    interaction::Interaction,
 };
 use twilight_util::builder::command::CommandBuilder;
 
@@ -19,6 +19,6 @@ pub static COMMAND: LazyLock<Command> = LazyLock::new(|| {
 });
 
 #[tracing::instrument]
-pub async fn handle(state: State, data: CommandData) {
+pub async fn handle(state: State, interaction: Interaction) {
     todo!();
 }
diff --git a/src/main.rs b/src/main.rs
index ccb248d..6fb1de9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -109,8 +109,8 @@ async fn main() -> Result<(), MainError> {
     let intents = Intents::GUILD_VOICE_STATES;
     let mut shard = Shard::new(shard_id, discord_token.expose_secret().to_owned(), intents);
 
-    let vc_event_types = EventTypeFlags::GUILD_VOICE_STATES;
-    let mut next_event = shard.next_event(vc_event_types);
+    let event_types = EventTypeFlags::GUILD_VOICE_STATES | EventTypeFlags::INTERACTION_CREATE;
+    let mut next_event = shard.next_event(event_types);
 
     let discord_client = twilight_http::Client::new(discord_token.expose_secret().to_owned());
 
@@ -161,7 +161,7 @@ async fn main() -> Result<(), MainError> {
             }
         }
 
-        next_event = shard.next_event(vc_event_types);
+        next_event = shard.next_event(event_types);
     }
 
     Ok(())
@@ -176,13 +176,16 @@ async fn handle_event(command_router: &CommandRouter, vcs: Arc<VCs>, event: Even
         Event::InteractionCreate(interaction_create) => {
             let InteractionCreate(interaction) = *interaction_create;
 
-            match interaction.data {
+            match &interaction.data {
                 None => {
                     tracing::warn!("missing expected interaction data");
                 }
                 Some(InteractionData::ApplicationCommand(command_data)) => {
+                    let command_name = &command_data.name.clone();
                     let state = State { vcs };
-                    command_router.handle(state, *command_data).await;
+                    command_router
+                        .handle(state, command_name, interaction)
+                        .await;
                 }
 
                 Some(InteractionData::MessageComponent(component_data)) => {
diff --git a/src/one_to_many_with_data.rs b/src/one_to_many_with_data.rs
index e539166..b6342c4 100644
--- a/src/one_to_many_with_data.rs
+++ b/src/one_to_many_with_data.rs
@@ -48,6 +48,21 @@ where
         self.right_to_left.get(right)
     }
 
+    pub fn get_left_and_data_for(&self, right: &Right) -> Option<(&Left, &RightData)> {
+        let left = self.right_to_left.get(right)?;
+        let rights = self.get_rights_for(left)?;
+
+        let right_data = rights.get(right)?;
+
+        Some((left, right_data))
+    }
+
+    pub fn get_data_for(&self, right: &Right) -> Option<&RightData> {
+        let (_left, right_data) = self.get_left_and_data_for(right)?;
+
+        Some(right_data)
+    }
+
     pub fn remove_left(&mut self, left: &Left) -> Option<(Left, BTreeMap<Right, RightData>)> {
         let (left, rights) = self.left_to_rights.remove_entry(left)?;