diff --git a/crabidy-server/armv7-unknown-linux-gnueabihf-Dockerfile b/crabidy-server/armv7-unknown-linux-gnueabihf-Dockerfile
new file mode 100644
index 0000000..2a7af95
--- /dev/null
+++ b/crabidy-server/armv7-unknown-linux-gnueabihf-Dockerfile
@@ -0,0 +1,5 @@
+FROM ghcr.io/cross-rs/armv7-unknown-linux-gnueabihf:edge
+RUN dpkg --add-architecture armhf
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update &&  apt-get install -y alsa:armhf librust-alsa-sys-dev:armhf libasound2-dev:armhf portaudio19-dev:armhf build-essential libpulse-dev:armhf libdbus-1-dev:armhf pkg-config apt-utils unzip
+RUN curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v23.2/protoc-23.2-linux-x86_64.zip && unzip protoc-23.2-linux-x86_64.zip
diff --git a/crabidy-server/src/lib.rs b/crabidy-server/src/lib.rs
new file mode 100644
index 0000000..e991e83
--- /dev/null
+++ b/crabidy-server/src/lib.rs
@@ -0,0 +1,237 @@
+use crabidy_core::proto::crabidy::{Queue, Track};
+use rand::{seq::SliceRandom, thread_rng};
+use std::time::SystemTime;
+use tracing::debug;
+
+#[derive(Clone)]
+pub struct QueueManager {
+    created_at: SystemTime,
+    current_offset: usize,
+    play_order: Vec<usize>,
+    tracks: Vec<Track>,
+    pub repeat: bool,
+    pub shuffle: bool,
+}
+
+impl From<QueueManager> for Queue {
+    fn from(queue_manager: QueueManager) -> Self {
+        Self {
+            timestamp: queue_manager.created_at.elapsed().unwrap().as_secs(),
+            current_position: queue_manager.current_position() as u32,
+            tracks: queue_manager.tracks,
+        }
+    }
+}
+
+impl QueueManager {
+    pub fn new() -> Self {
+        Self {
+            created_at: SystemTime::now(),
+            current_offset: 0,
+            play_order: Vec::new(),
+            tracks: Vec::new(),
+            repeat: false,
+            shuffle: false,
+        }
+    }
+    pub fn current_position(&self) -> usize {
+        if self.current_offset < self.play_order.len() {
+            self.play_order[self.current_offset]
+        } else {
+            0
+        }
+    }
+
+    pub fn shuffle_on(&mut self) {
+        self.shuffle = true;
+        self.shuffle_before(self.current_offset);
+        self.shuffle_behind(self.current_offset);
+    }
+
+    pub fn shuffle_off(&mut self) {
+        self.shuffle = false;
+        self.play_order = (0..self.tracks.len()).collect();
+    }
+
+    pub fn shuffle_all(&mut self) {
+        self.play_order.shuffle(&mut thread_rng());
+    }
+
+    pub fn shuffle_before(&mut self, pos: usize) {
+        self.play_order[..pos].shuffle(&mut thread_rng());
+    }
+
+    pub fn shuffle_behind(&mut self, pos: usize) {
+        self.play_order[pos + 1..].shuffle(&mut thread_rng());
+    }
+
+    pub fn current_track(&self) -> Option<Track> {
+        if self.current_position() < self.tracks.len() {
+            Some(self.tracks[self.current_position()].clone())
+        } else {
+            None
+        }
+    }
+
+    pub fn next_track(&mut self) -> Option<Track> {
+        let len = self.tracks.len();
+        if self.current_offset < len - 1 {
+            self.current_offset += 1;
+            let current_pos = self.current_position();
+            if current_pos < len {
+                Some(self.tracks[current_pos].clone())
+            } else {
+                None
+            }
+        } else {
+            debug!("no more tracks");
+            if self.repeat {
+                debug!("repeat");
+                self.current_offset = 0;
+                if self.shuffle {
+                    self.shuffle_all();
+                }
+                return self.current_track();
+            }
+            None
+        }
+    }
+
+    pub fn prev_track(&mut self) -> Option<Track> {
+        if 0 < self.current_offset {
+            self.current_offset -= 1;
+            Some(self.tracks[self.current_position()].clone())
+        } else {
+            None
+        }
+    }
+
+    pub fn set_current_position(&mut self, current_position: u32) -> bool {
+        if current_position < self.tracks.len() as u32 {
+            if self.shuffle {
+                self.shuffle_all();
+            }
+            let current_offset = self
+                .play_order
+                .iter()
+                .position(|&i| i == current_position as usize)
+                .unwrap();
+            if self.shuffle {
+                self.play_order.swap(0, current_offset);
+                self.current_offset = 0;
+            } else {
+                self.current_offset = current_offset;
+            }
+            true
+        } else {
+            false
+        }
+    }
+
+    pub fn replace_with_tracks(&mut self, tracks: &[Track]) -> Option<Track> {
+        self.current_offset = 0;
+        self.tracks = tracks.to_vec();
+        self.play_order = (0..self.tracks.len()).collect();
+        if self.shuffle {
+            self.shuffle_all();
+        }
+        if 0 < self.tracks.len() as u32 {
+            Some(self.tracks[self.current_position()].clone())
+        } else {
+            None
+        }
+    }
+
+    pub fn append_tracks(&mut self, tracks: &[Track]) {
+        let len = self.tracks.len();
+        let order_additions: Vec<usize> = (len..len + tracks.len()).collect();
+        self.play_order.extend(order_additions);
+        self.tracks.extend(tracks.iter().cloned());
+        if self.shuffle {
+            self.shuffle_behind(self.current_offset);
+        }
+    }
+
+    pub fn queue_tracks(&mut self, tracks: &[Track]) {
+        let len = self.tracks.len();
+        if len == 0 {
+            self.replace_with_tracks(tracks);
+            return;
+        }
+        let pos = self.current_position();
+        let order_additions: Vec<usize> = (len..len + tracks.len()).collect();
+        self.play_order.extend(order_additions);
+        let tail: Vec<Track> = self
+            .tracks
+            .splice((self.current_position() + 1).., tracks.to_vec())
+            .collect();
+        self.tracks.extend(tail);
+        self.play_order
+            .iter_mut()
+            .filter(|i| (pos as usize) < **i)
+            .for_each(|i| *i += len);
+        if self.shuffle {
+            self.shuffle_behind(self.current_offset);
+        }
+    }
+
+    pub fn remove_tracks(&mut self, positions: &[u32]) -> Option<Track> {
+        let mut play_next = false;
+        for pos in positions {
+            if (self.tracks.len() as u32) < *pos {
+                return None;
+            };
+            if *pos == self.current_position() as u32 {
+                play_next = true;
+            }
+            let offset = self
+                .play_order
+                .iter()
+                .position(|&i| i == *pos as usize)
+                .unwrap();
+            if offset < self.current_offset {
+                self.current_offset -= 1;
+            }
+            self.tracks.remove(*pos as usize);
+            self.play_order.remove(offset);
+            self.play_order
+                .iter_mut()
+                .filter(|i| (*pos as usize) < **i)
+                .for_each(|i| *i -= 1);
+        }
+        if play_next {
+            self.current_track()
+        } else {
+            None
+        }
+    }
+
+    pub fn insert_tracks(&mut self, position: u32, tracks: &[Track]) {
+        let len = self.tracks.len();
+        let order_additions: Vec<usize> = (len..len + tracks.len()).collect();
+        self.play_order.extend(order_additions);
+        let tail: Vec<Track> = self
+            .tracks
+            .splice((position as usize + 1).., tracks.to_vec())
+            .collect();
+        self.tracks.extend(tail);
+        if self.shuffle {
+            self.shuffle_behind(self.current_offset);
+        }
+    }
+}
+
+#[cfg(test)]
+
+mod tests {
+    use super::*;
+
+    #[test]
+    fn random_delete_before() {}
+    #[test]
+    fn random_delete_track() {}
+    #[test]
+    fn random_delete_after() {}
+    #[test]
+    fn random_select_track() {}
+}