From 3490cd6ed9d6a92ef8a8220b43f956f51ba4a309 Mon Sep 17 00:00:00 2001
From: Jonas Heinrich <onny@project-insanity.org>
Date: Tue, 10 Mar 2026 23:25:26 +0100
Subject: [PATCH] init

---
 .gitignore  |    5 +
 Cargo.lock  | 2068 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   11 +
 flake.lock  |   62 ++
 flake.nix   |   47 ++
 result      |    1 +
 src/main.rs |  605 +++++++++++++++
 7 files changed, 2799 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 120000 result
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
index 69cb356..5acaefe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,8 @@
 /captures
 .externalNativeBuild
 .idea/*
+
+
+# Added by cargo
+
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a76249b
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2068 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..dbc3fc0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "next-companion"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+gtk = { package = "gtk4", version = "0.10" }
+adw = { package = "libadwaita", version = "0.8", features = ["v1_6"] }
+reqwest = { version = "0.12", features = ["blocking", "rustls-tls"], default-features = false }
+serde_json = "1"
+dirs = "5"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..09412e5
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,62 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1772963539,
+        "narHash": "sha256-9jVDGZnvCckTGdYT53d/EfznygLskyLQXYwJLKMPsZs=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9dcb002ca1690658be4a04645215baea8b95f31d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1773115373,
+        "narHash": "sha256-bfK9FJFcQth6f3ydYggS5m0z2NRGF/PY6Y2XgZDJ6pg=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "1924b4672a2b8e4aee6e6652ec2e59a8d3c5648e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..97f288f
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,47 @@
+{
+  description = "NextCompanion — a minimal GTK4 Nextbike client for Linux";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay, ... }:
+    let
+      system = "x86_64-linux";
+      overlays = [ (import rust-overlay) ];
+      pkgs = import nixpkgs { inherit system overlays; };
+
+      runtimeDeps = with pkgs; [
+        gtk4
+        libadwaita
+        glib
+      ];
+      buildDeps = with pkgs; [
+        pkg-config
+        rust-bin.stable.latest.default
+      ];
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = buildDeps ++ runtimeDeps;
+        shellHook = ''
+          export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath runtimeDeps}:$LD_LIBRARY_PATH"
+        '';
+      };
+
+      packages.${system}.default = pkgs.rustPlatform.buildRustPackage {
+        pname = "next-companion";
+        version = "0.1.0";
+        src = ./.;
+        cargoLock.lockFile = ./Cargo.lock;
+        nativeBuildInputs = buildDeps;
+        buildInputs = runtimeDeps;
+      };
+
+      apps.${system}.default = {
+        type = "app";
+        program = "${self.packages.${system}.default}/bin/next-companion";
+      };
+    };
+}
diff --git a/result b/result
new file mode 120000
index 0000000..91521cf
--- /dev/null
+++ b/result
@@ -0,0 +1 @@
+/nix/store/gan72x7dji7c6lwngwfx88my14azg9wn-next-companion-0.1.0
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..31f6de8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,605 @@
+use adw::prelude::*;
+use adw::{Application, ApplicationWindow, BottomSheet, Clamp, HeaderBar, NavigationPage, NavigationView};
+use gtk::{
+    Box, Button, Entry, Label, ListBox, ListBoxRow, Orientation, ScrolledWindow, Spinner, Stack,
+};
+use gtk::gio;
+use gtk::glib;
+use std::cell::RefCell;
+use std::fs;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+const API_KEY: &str = "3IaBlP9OZw14dvES";
+const BASE_URL: &str = "https://api.nextbike.net";
+
+// ── Bike model ────────────────────────────────────────────────────────────────
+
+#[derive(Clone)]
+struct Bike {
+    id: String,
+    code: String,
+    electric_lock: bool,
+}
+
+// ── Persistent login key ──────────────────────────────────────────────────────
+
+fn config_path() -> PathBuf {
+    let mut p = dirs::config_dir().unwrap_or_else(|| PathBuf::from("."));
+    p.push("next-companion");
+    p.push("loginkey");
+    p
+}
+
+fn load_loginkey() -> Option<String> {
+    fs::read_to_string(config_path())
+        .ok()
+        .map(|s| s.trim().to_string())
+        .filter(|s| !s.is_empty())
+}
+
+fn save_loginkey(key: &str) {
+    let path = config_path();
+    if let Some(parent) = path.parent() {
+        let _ = fs::create_dir_all(parent);
+    }
+    let _ = fs::write(&path, key);
+}
+
+fn clear_loginkey() {
+    let _ = fs::remove_file(config_path());
+}
+
+// ── API calls (blocking — run via gio::spawn_blocking) ────────────────────────
+
+fn api_login(phone: &str, pin: &str) -> Result<String, String> {
+    let resp = reqwest::blocking::Client::new()
+        .post(format!("{BASE_URL}/api/login.json"))
+        .form(&[("apikey", API_KEY), ("mobile", phone), ("pin", pin)])
+        .send()
+        .map_err(|e| e.to_string())?;
+    let json: serde_json::Value =
+        serde_json::from_str(&resp.text().map_err(|e| e.to_string())?)
+            .map_err(|e| e.to_string())?;
+    json["user"]["loginkey"]
+        .as_str()
+        .map(|s| s.to_string())
+        .ok_or_else(|| "Invalid credentials".to_string())
+}
+
+fn api_get_rentals(loginkey: &str) -> Result<Vec<Bike>, String> {
+    let resp = reqwest::blocking::Client::new()
+        .post(format!("{BASE_URL}/api/getOpenRentals.json"))
+        .form(&[("apikey", API_KEY), ("loginkey", loginkey)])
+        .send()
+        .map_err(|e| e.to_string())?;
+    let json: serde_json::Value =
+        serde_json::from_str(&resp.text().map_err(|e| e.to_string())?)
+            .map_err(|e| e.to_string())?;
+    let arr = json["rentalCollection"]
+        .as_array()
+        .ok_or_else(|| "No rental data".to_string())?;
+    Ok(arr
+        .iter()
+        .map(|b| Bike {
+            id: b["bike"].as_str().unwrap_or("").to_string(),
+            code: b["code"].as_str().unwrap_or("").to_string(),
+            electric_lock: b["electric_lock"].as_str().map_or(false, |s| s == "true"),
+        })
+        .collect())
+}
+
+fn api_rent(loginkey: &str, bike_id: &str) -> Result<(), String> {
+    reqwest::blocking::Client::new()
+        .post(format!("{BASE_URL}/api/rent.json"))
+        .form(&[("apikey", API_KEY), ("loginkey", loginkey), ("bike", bike_id)])
+        .send()
+        .map_err(|e| e.to_string())?;
+    Ok(())
+}
+
+fn api_return(loginkey: &str, bike_id: &str, station_id: &str) -> Result<(), String> {
+    reqwest::blocking::Client::new()
+        .post(format!("{BASE_URL}/api/return.json"))
+        .form(&[
+            ("apikey", API_KEY),
+            ("bike", bike_id),
+            ("loginkey", loginkey),
+            ("station", station_id),
+            ("comment", ""),
+        ])
+        .send()
+        .map_err(|e| e.to_string())?;
+    Ok(())
+}
+
+// ── Async helpers (run on GLib main context) ──────────────────────────────────
+
+async fn load_rentals(key: String, bikes: Rc<RefCell<Vec<Bike>>>, bikes_list: ListBox, list_stack: Stack) {
+    let result = match gio::spawn_blocking(move || api_get_rentals(&key)).await {
+        Ok(r) => r,
+        Err(_) => return,
+    };
+    if let Ok(new_bikes) = result {
+        while let Some(child) = bikes_list.first_child() {
+            bikes_list.remove(&child);
+        }
+        for bike in &new_bikes {
+            let text = format!(
+                "Bike {}  ·  code: {}{}",
+                bike.id,
+                bike.code,
+                if bike.electric_lock { "  ⚡" } else { "" }
+            );
+            let lbl = Label::builder()
+                .label(&text)
+                .xalign(0.0)
+                .margin_top(14)
+                .margin_bottom(14)
+                .margin_start(12)
+                .margin_end(12)
+                .build();
+            let row = ListBoxRow::new();
+            row.set_child(Some(&lbl));
+            bikes_list.append(&row);
+        }
+        list_stack.set_visible_child_name(if new_bikes.is_empty() { "empty" } else { "list" });
+        *bikes.borrow_mut() = new_bikes;
+    }
+}
+
+// ── Entry point ───────────────────────────────────────────────────────────────
+
+fn main() -> glib::ExitCode {
+    let app = Application::builder()
+        .application_id("org.nextbike.NextCompanion")
+        .build();
+    app.connect_activate(build_ui);
+    app.run()
+}
+
+// ── UI ────────────────────────────────────────────────────────────────────────
+
+fn build_ui(app: &Application) {
+    let loginkey: Rc<RefCell<Option<String>>> = Rc::new(RefCell::new(load_loginkey()));
+    let bikes: Rc<RefCell<Vec<Bike>>> = Rc::new(RefCell::new(vec![]));
+    let return_bike: Rc<RefCell<Option<Bike>>> = Rc::new(RefCell::new(None));
+
+    // ── Login page ────────────────────────────────────────────────────────────
+    let phone_entry = Entry::builder()
+        .placeholder_text("Phone number")
+        .build();
+    let pin_entry = Entry::builder()
+        .placeholder_text("PIN")
+        .visibility(false)
+        .build();
+    let login_err = Label::builder()
+        .css_classes(["error"])
+        .wrap(true)
+        .visible(false)
+        .build();
+    let login_btn = Button::builder()
+        .label("Sign In")
+        .css_classes(["suggested-action", "pill"])
+        .build();
+    let login_spinner = Spinner::new();
+
+    let login_form = Box::builder()
+        .orientation(Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24).margin_bottom(24).margin_start(12).margin_end(12)
+        .build();
+    login_form.append(&phone_entry);
+    login_form.append(&pin_entry);
+    login_form.append(&login_err);
+    login_form.append(&login_btn);
+    login_form.append(&login_spinner);
+
+    let login_clamp = Clamp::builder().maximum_size(400).build();
+    login_clamp.set_child(Some(&login_form));
+
+    let login_body = Box::builder().orientation(Orientation::Vertical).build();
+    login_body.append(&HeaderBar::new());
+    login_body.append(&login_clamp);
+
+    let login_page = NavigationPage::builder()
+        .title("Sign In")
+        .child(&login_body)
+        .build();
+
+    // ── Main page ─────────────────────────────────────────────────────────────
+    let bikes_list = ListBox::builder()
+        .css_classes(["boxed-list"])
+        .selection_mode(gtk::SelectionMode::None)
+        .margin_top(8).margin_bottom(8).margin_start(12).margin_end(12)
+        .build();
+    let empty_label = Label::builder()
+        .label("No active rentals")
+        .margin_top(48)
+        .css_classes(["dim-label"])
+        .build();
+    let list_stack = Stack::new();
+    list_stack.add_named(&empty_label, Some("empty"));
+    list_stack.add_named(&bikes_list, Some("list"));
+    list_stack.set_visible_child_name("empty");
+
+    let scroll = ScrolledWindow::builder().vexpand(true).child(&list_stack).build();
+
+    let rent_btn = Button::builder()
+        .label("Rent a Bike")
+        .css_classes(["suggested-action", "pill"])
+        .margin_top(8).margin_bottom(12).margin_start(12).margin_end(12)
+        .build();
+
+    let main_hdr = HeaderBar::new();
+    let logout_btn = Button::builder()
+        .icon_name("system-log-out-symbolic")
+        .tooltip_text("Logout")
+        .build();
+    let refresh_btn = Button::builder()
+        .icon_name("view-refresh-symbolic")
+        .tooltip_text("Refresh")
+        .build();
+    main_hdr.pack_end(&logout_btn);
+    main_hdr.pack_start(&refresh_btn);
+
+    // ── Return sheet (bottom sheet) ───────────────────────────────────────────
+    let station_entry = Entry::builder()
+        .placeholder_text("Station number")
+        .input_purpose(gtk::InputPurpose::Digits)
+        .build();
+    let ret_err = Label::builder()
+        .css_classes(["error"])
+        .wrap(true)
+        .visible(false)
+        .build();
+    let ret_submit = Button::builder()
+        .label("Return Bike")
+        .css_classes(["destructive-action", "pill"])
+        .build();
+    let ret_spinner = Spinner::new();
+    let electric_msg = Label::builder()
+        .label("This bike has an electric lock.\nJust close the lock to return it.")
+        .wrap(true)
+        .justify(gtk::Justification::Center)
+        .margin_top(24)
+        .build();
+
+    let manual_form = Box::builder()
+        .orientation(Orientation::Vertical)
+        .spacing(12)
+        .build();
+    manual_form.append(&station_entry);
+    manual_form.append(&ret_err);
+    manual_form.append(&ret_submit);
+    manual_form.append(&ret_spinner);
+
+    let ret_inner = Stack::new();
+    ret_inner.add_named(&manual_form, Some("manual"));
+    ret_inner.add_named(&electric_msg, Some("electric"));
+
+    let sheet_title = Label::builder()
+        .css_classes(["title-4"])
+        .label("Return Bike")
+        .xalign(0.0)
+        .build();
+    let sheet_box = Box::builder()
+        .orientation(Orientation::Vertical)
+        .spacing(16)
+        .margin_top(8)
+        .margin_bottom(24)
+        .margin_start(16)
+        .margin_end(16)
+        .build();
+    sheet_box.append(&sheet_title);
+    sheet_box.append(&ret_inner);
+
+    let bottom_sheet = BottomSheet::builder()
+        .show_drag_handle(true)
+        .sheet(&sheet_box)
+        .build();
+
+    let main_content = Box::builder().orientation(Orientation::Vertical).build();
+    main_content.append(&scroll);
+    main_content.append(&rent_btn);
+    bottom_sheet.set_content(Some(&main_content));
+
+    let main_body = Box::builder().orientation(Orientation::Vertical).build();
+    main_body.append(&main_hdr);
+    main_body.append(&bottom_sheet);
+
+    let main_page = NavigationPage::builder()
+        .title("NextCompanion")
+        .child(&main_body)
+        .build();
+
+    // ── Rent page ─────────────────────────────────────────────────────────────
+    let bike_entry = Entry::builder()
+        .placeholder_text("Bike number")
+        .input_purpose(gtk::InputPurpose::Digits)
+        .build();
+    let rent_err = Label::builder()
+        .css_classes(["error"])
+        .wrap(true)
+        .visible(false)
+        .build();
+    let rent_submit = Button::builder()
+        .label("Rent")
+        .css_classes(["suggested-action", "pill"])
+        .build();
+    let rent_spinner = Spinner::new();
+
+    let rent_form = Box::builder()
+        .orientation(Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24).margin_bottom(24).margin_start(12).margin_end(12)
+        .build();
+    rent_form.append(&bike_entry);
+    rent_form.append(&rent_err);
+    rent_form.append(&rent_submit);
+    rent_form.append(&rent_spinner);
+
+    let rent_clamp = Clamp::builder().maximum_size(400).build();
+    rent_clamp.set_child(Some(&rent_form));
+
+    let rent_body = Box::builder().orientation(Orientation::Vertical).build();
+    rent_body.append(&HeaderBar::new());
+    rent_body.append(&rent_clamp);
+
+    let rent_page = NavigationPage::builder()
+        .title("Rent Bike")
+        .child(&rent_body)
+        .build();
+
+    // ── Navigation view ───────────────────────────────────────────────────────
+    let nav = NavigationView::new();
+    nav.push(&main_page);
+    if loginkey.borrow().is_none() {
+        nav.push(&login_page);
+    }
+
+    // ── Window ────────────────────────────────────────────────────────────────
+    let window = ApplicationWindow::builder()
+        .application(app)
+        .title("NextCompanion")
+        .default_width(390)
+        .default_height(700)
+        .content(&nav)
+        .build();
+
+    // ── Login button ──────────────────────────────────────────────────────────
+    {
+        let phone = phone_entry.clone();
+        let pin = pin_entry.clone();
+        let err = login_err.clone();
+        let spinner = login_spinner.clone();
+        let btn = login_btn.clone();
+        let nav = nav.clone();
+        let loginkey = loginkey.clone();
+        let bikes = bikes.clone();
+        let bikes_list = bikes_list.clone();
+        let list_stack = list_stack.clone();
+        login_btn.connect_clicked(move |_| {
+            let p = phone.text().to_string();
+            let n = pin.text().to_string();
+            if p.is_empty() || n.is_empty() {
+                err.set_label("Phone and PIN are required");
+                err.set_visible(true);
+                return;
+            }
+            err.set_visible(false);
+            spinner.set_spinning(true);
+            btn.set_sensitive(false);
+
+            let spinner = spinner.clone();
+            let btn = btn.clone();
+            let err = err.clone();
+            let nav = nav.clone();
+            let loginkey = loginkey.clone();
+            let bikes = bikes.clone();
+            let bikes_list = bikes_list.clone();
+            let list_stack = list_stack.clone();
+            glib::MainContext::default().spawn_local(async move {
+                let result = match gio::spawn_blocking(move || api_login(&p, &n)).await {
+                    Ok(r) => r,
+                    Err(_) => Err("Internal error".to_string()),
+                };
+                spinner.set_spinning(false);
+                btn.set_sensitive(true);
+                match result {
+                    Ok(key) => {
+                        save_loginkey(&key);
+                        *loginkey.borrow_mut() = Some(key.clone());
+                        nav.pop();
+                        load_rentals(key, bikes, bikes_list, list_stack).await;
+                    }
+                    Err(e) => {
+                        err.set_label(&e);
+                        err.set_visible(true);
+                    }
+                }
+            });
+        });
+    }
+
+    // ── Logout button ─────────────────────────────────────────────────────────
+    {
+        let nav = nav.clone();
+        let login_page = login_page.clone();
+        let loginkey = loginkey.clone();
+        logout_btn.connect_clicked(move |_| {
+            clear_loginkey();
+            *loginkey.borrow_mut() = None;
+            nav.push(&login_page);
+        });
+    }
+
+    // ── Refresh button ────────────────────────────────────────────────────────
+    {
+        let loginkey = loginkey.clone();
+        let bikes = bikes.clone();
+        let bikes_list = bikes_list.clone();
+        let list_stack = list_stack.clone();
+        refresh_btn.connect_clicked(move |_| {
+            if let Some(key) = loginkey.borrow().clone() {
+                let bikes = bikes.clone();
+                let bikes_list = bikes_list.clone();
+                let list_stack = list_stack.clone();
+                glib::MainContext::default().spawn_local(async move {
+                    load_rentals(key, bikes, bikes_list, list_stack).await;
+                });
+            }
+        });
+    }
+
+    // ── Open rent page ────────────────────────────────────────────────────────
+    {
+        let nav = nav.clone();
+        let rent_page = rent_page.clone();
+        let bike_entry = bike_entry.clone();
+        rent_btn.connect_clicked(move |_| {
+            bike_entry.set_text("");
+            nav.push(&rent_page);
+        });
+    }
+
+    // ── Rent submit ───────────────────────────────────────────────────────────
+    {
+        let loginkey = loginkey.clone();
+        let entry = bike_entry.clone();
+        let err = rent_err.clone();
+        let spinner = rent_spinner.clone();
+        let btn = rent_submit.clone();
+        let nav = nav.clone();
+        let bikes = bikes.clone();
+        let bikes_list = bikes_list.clone();
+        let list_stack = list_stack.clone();
+        rent_submit.connect_clicked(move |_| {
+            let id = entry.text().to_string();
+            if id.is_empty() {
+                err.set_label("Enter a bike number");
+                err.set_visible(true);
+                return;
+            }
+            if let Some(key) = loginkey.borrow().clone() {
+                err.set_visible(false);
+                spinner.set_spinning(true);
+                btn.set_sensitive(false);
+
+                let spinner = spinner.clone();
+                let btn = btn.clone();
+                let err = err.clone();
+                let nav = nav.clone();
+                let bikes = bikes.clone();
+                let bikes_list = bikes_list.clone();
+                let list_stack = list_stack.clone();
+                let key_reload = key.clone();
+                glib::MainContext::default().spawn_local(async move {
+                    let result = match gio::spawn_blocking(move || api_rent(&key, &id)).await {
+                        Ok(r) => r,
+                        Err(_) => Err("Internal error".to_string()),
+                    };
+                    spinner.set_spinning(false);
+                    btn.set_sensitive(true);
+                    if let Err(e) = result {
+                        err.set_label(&e);
+                        err.set_visible(true);
+                    } else {
+                        nav.pop();
+                        load_rentals(key_reload, bikes, bikes_list, list_stack).await;
+                    }
+                });
+            }
+        });
+    }
+
+    // ── Click rental row → open return bottom sheet ───────────────────────────
+    {
+        let bottom_sheet = bottom_sheet.clone();
+        let bikes = bikes.clone();
+        let return_bike = return_bike.clone();
+        let ret_inner = ret_inner.clone();
+        let station_entry = station_entry.clone();
+        let ret_err = ret_err.clone();
+        bikes_list.connect_row_activated(move |_, row| {
+            let idx = row.index() as usize;
+            let bike = bikes.borrow().get(idx).cloned();
+            if let Some(bike) = bike {
+                station_entry.set_text("");
+                ret_err.set_visible(false);
+                ret_inner.set_visible_child_name(if bike.electric_lock { "electric" } else { "manual" });
+                *return_bike.borrow_mut() = Some(bike);
+                bottom_sheet.set_open(true);
+            }
+        });
+    }
+
+    // ── Return submit ─────────────────────────────────────────────────────────
+    {
+        let loginkey = loginkey.clone();
+        let return_bike = return_bike.clone();
+        let entry = station_entry.clone();
+        let err = ret_err.clone();
+        let spinner = ret_spinner.clone();
+        let btn = ret_submit.clone();
+        let bottom_sheet = bottom_sheet.clone();
+        let bikes = bikes.clone();
+        let bikes_list = bikes_list.clone();
+        let list_stack = list_stack.clone();
+        ret_submit.connect_clicked(move |_| {
+            let station = entry.text().to_string();
+            if station.is_empty() {
+                err.set_label("Enter a station number");
+                err.set_visible(true);
+                return;
+            }
+            if let (Some(key), Some(bike)) =
+                (loginkey.borrow().clone(), return_bike.borrow().clone())
+            {
+                err.set_visible(false);
+                spinner.set_spinning(true);
+                btn.set_sensitive(false);
+
+                let spinner = spinner.clone();
+                let btn = btn.clone();
+                let err = err.clone();
+                let bottom_sheet = bottom_sheet.clone();
+                let bikes = bikes.clone();
+                let bikes_list = bikes_list.clone();
+                let list_stack = list_stack.clone();
+                let key_reload = key.clone();
+                glib::MainContext::default().spawn_local(async move {
+                    let result = match gio::spawn_blocking(move || {
+                        api_return(&key, &bike.id, &station)
+                    })
+                    .await
+                    {
+                        Ok(r) => r,
+                        Err(_) => Err("Internal error".to_string()),
+                    };
+                    spinner.set_spinning(false);
+                    btn.set_sensitive(true);
+                    if let Err(e) = result {
+                        err.set_label(&e);
+                        err.set_visible(true);
+                    } else {
+                        bottom_sheet.set_open(false);
+                        load_rentals(key_reload, bikes, bikes_list, list_stack).await;
+                    }
+                });
+            }
+        });
+    }
+
+    // ── Initial rentals load ──────────────────────────────────────────────────
+    if let Some(key) = loginkey.borrow().clone() {
+        let bikes = bikes.clone();
+        let bikes_list = bikes_list.clone();
+        let list_stack = list_stack.clone();
+        glib::MainContext::default().spawn_local(async move {
+            load_rentals(key, bikes, bikes_list, list_stack).await;
+        });
+    }
+
+    window.present();
+}