implement phase 1~3

src/app.rs

@@ -0,0 +1,148 @@
+use std::sync::mpsc::{self, Sender};
+use std::time::Duration;
+
+use eframe::egui;
+
+use crate::config::Config;
+use crate::countries::{get_countries, Country};
+use crate::nordvpn::{self, CmdResult, Poller};
+use crate::ui::country_selector::CountrySelector;
+
+pub struct App {
+    config: Config,
+    countries: Vec<Country>,
+    poller: Poller,
+    cmd_tx: Sender<CmdResult>,
+    cmd_rx: mpsc::Receiver<CmdResult>,
+    selector: CountrySelector,
+    /// Last connect/disconnect result shown inline below the status bar.
+    notification: Option<String>,
+}
+
+impl App {
+    pub fn new(_cc: &eframe::CreationContext<'_>) -> Self {
+        let config = Config::load();
+        let countries = get_countries(&config.external_app);
+        let poller = Poller::new(config.external_app.clone(), config.refresh_rate);
+        let (cmd_tx, cmd_rx) = mpsc::channel();
+
+        Self {
+            config,
+            countries,
+            poller,
+            cmd_tx,
+            cmd_rx,
+            selector: CountrySelector::default(),
+            notification: None,
+        }
+    }
+
+    fn spawn_connect(&self, nordvpn_key: String) {
+        let app = self.config.external_app.clone();
+        let tx = self.cmd_tx.clone();
+        std::thread::spawn(move || {
+            let _ = tx.send(nordvpn::connect(&app, &nordvpn_key));
+        });
+    }
+
+    fn spawn_disconnect(&self) {
+        let app = self.config.external_app.clone();
+        let tx = self.cmd_tx.clone();
+        std::thread::spawn(move || {
+            let _ = tx.send(nordvpn::disconnect(&app));
+        });
+    }
+
+}
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        // Drain completed command results.
+        while let Ok(result) = self.cmd_rx.try_recv() {
+            self.notification = Some(match result {
+                CmdResult::Success { output, .. } => output.trim().to_string(),
+                CmdResult::Failure { cmd, message } => {
+                    format!("Error running '{cmd}': {message}")
+                }
+            });
+        }
+
+        // Repaint often enough to stay live without busy-looping.
+        ctx.request_repaint_after(Duration::from_secs(1));
+
+        let status = self.poller.status.lock().unwrap().clone();
+
+        // ── Status panel ────────────────────────────────────────────────────
+        egui::TopBottomPanel::top("status_panel")
+            .min_height(40.0)
+            .show(ctx, |ui| {
+                ui.add_space(4.0);
+                ui.horizontal(|ui| {
+                    ui.strong(&status.status);
+                    if let Some(country) = &status.country {
+                        ui.separator();
+                        ui.label(country);
+                    }
+                    if let Some(ip) = &status.ip {
+                        ui.separator();
+                        ui.label(ip);
+                    }
+                    if let Some(uptime) = &status.uptime {
+                        ui.separator();
+                        ui.weak(uptime);
+                    }
+                });
+                if let Some(note) = &self.notification {
+                    ui.add_space(2.0);
+                    ui.weak(note);
+                }
+                ui.add_space(4.0);
+            });
+
+        // ── Bottom bar ──────────────────────────────────────────────────────
+        egui::TopBottomPanel::bottom("bottom_bar")
+            .min_height(36.0)
+            .show(ctx, |ui| {
+                ui.add_space(4.0);
+                ui.horizontal(|ui| {
+                    if ui.button("Disconnect").clicked() {
+                        self.notification = None;
+                        self.spawn_disconnect();
+                    }
+                    ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                        if ui.button("Configure").clicked() {
+                            // Phase 7
+                        }
+                    });
+                });
+            });
+
+        // ── Left panel — country selector ───────────────────────────────────
+        let panel_width = ctx.screen_rect().width() * 0.3;
+        let connect_key =
+            egui::SidePanel::left("country_selector")
+                .exact_width(panel_width)
+                .resizable(false)
+                .show(ctx, |ui| {
+                    self.selector.show(
+                        ui,
+                        &self.countries,
+                        &self.config.favorites,
+                        status.country.as_deref(),
+                    )
+                })
+                .inner;
+
+        if let Some(key) = connect_key {
+            self.notification = None;
+            self.spawn_connect(key);
+        }
+
+        // ── Central panel — world map placeholder ───────────────────────────
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.centered_and_justified(|ui| {
+                ui.weak("World map — Phase 5");
+            });
+        });
+    }
+}