From 2322cd00d21ce592238b19b57b325b15176092f1 Mon Sep 17 00:00:00 2001
From: Niklas Kapelle <niklas@kapelle.org>
Date: Fri, 27 Mar 2026 12:16:08 +0100
Subject: [PATCH] added selectable instance to tui

---
 src/tui.rs          |  2 ++
 src/tui/app.rs      | 82 +++++++++++++++++++++++++++++++++++++++++++--
 src/tui/instance.rs | 30 +++++++++++++++++
 src/tui/status.rs   | 12 +++++++
 4 files changed, 123 insertions(+), 3 deletions(-)
 create mode 100644 src/tui/instance.rs
 create mode 100644 src/tui/status.rs

diff --git a/src/tui.rs b/src/tui.rs
index 3b67790..df567e9 100644
--- a/src/tui.rs
+++ b/src/tui.rs
@@ -1,4 +1,6 @@
 mod app;
 mod mod_list;
+mod status;
+mod instance;
 
 pub use app::run;
diff --git a/src/tui/app.rs b/src/tui/app.rs
index d88b950..c87f49d 100644
--- a/src/tui/app.rs
+++ b/src/tui/app.rs
@@ -3,12 +3,15 @@ use std::io;
 use crossterm::event::{self, Event, KeyCode, KeyEvent, KeyEventKind};
 use ratatui::{
     DefaultTerminal, Frame,
-    layout::Rect,
+    layout::{Constraint, Direction, Layout, Rect},
     style::Style,
     widgets::{Block, Borders, StatefulWidget, TableState, Widget},
 };
 
-use crate::{tui::mod_list::ModList, types::RootConfig};
+use crate::{
+    tui::{instance::InstanceSelect, mod_list::ModList, status::StatusBar},
+    types::RootConfig,
+};
 
 pub fn run(root_config: &mut RootConfig) -> anyhow::Result<()> {
     ratatui::run(|terminal| App::new(root_config).run(terminal))?;
@@ -21,6 +24,7 @@ struct App<'a> {
     exit: bool,
 
     mod_list_state: TableState,
+    selected_instance: Option<String>,
 }
 
 impl<'a> App<'a> {
@@ -31,6 +35,7 @@ impl<'a> App<'a> {
         Self {
             root_config,
             mod_list_state: state,
+            selected_instance: None,
             exit: false,
         }
     }
@@ -67,6 +72,12 @@ impl<'a> App<'a> {
             KeyCode::Down | KeyCode::Char('j') => {
                 self.mod_list_state.select_next();
             }
+            KeyCode::Right | KeyCode::Char('l') => {
+                self.next_instance();
+            }
+            KeyCode::Left | KeyCode::Char('h') => {
+                self.prev_instance();
+            }
             _ => {}
         }
     }
@@ -74,6 +85,58 @@ impl<'a> App<'a> {
     fn exit(&mut self) {
         self.exit = true;
     }
+
+    fn next_instance(&mut self) {
+        let mut instances = self.root_config.instances();
+        instances.sort();
+
+        if instances.is_empty() {
+            self.selected_instance = None;
+            return;
+        }
+
+        let next = match &self.selected_instance {
+            None => instances.first().cloned(),
+            Some(curr) => {
+                let idx = instances.iter().position(|x| x == curr);
+                match idx {
+                    Some(i) => {
+                        let next_index = (i + 1) % instances.len();
+                        instances.get(next_index).cloned()
+                    }
+                    None => instances.first().cloned(),
+                }
+            }
+        };
+
+        self.selected_instance = next;
+    }
+
+    fn prev_instance(&mut self) {
+        let mut instances = self.root_config.instances();
+        instances.sort();
+
+        if instances.is_empty() {
+            self.selected_instance = None;
+            return;
+        }
+
+        let prev = match &self.selected_instance {
+            None => instances.last().cloned(),
+            Some(curr) => {
+                let idx = instances.iter().position(|x| x == curr);
+                match idx {
+                    Some(i) => {
+                        let prev_index = if i == 0 { instances.len() - 1 } else { i - 1 };
+                        instances.get(prev_index).cloned()
+                    }
+                    None => Some(instances[instances.len() - 1].clone()),
+                }
+            }
+        };
+
+        self.selected_instance = prev;
+    }
 }
 
 impl<'a> Widget for &mut App<'a> {
@@ -81,15 +144,28 @@ impl<'a> Widget for &mut App<'a> {
     where
         Self: Sized,
     {
+        let chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length(3),
+                Constraint::Min(1),
+                Constraint::Length(1), // single line for keybindings
+            ])
+            .split(area);
+
+        InstanceSelect::new(self.selected_instance.clone()).render(chunks[0], buf);
+
         let list_block = Block::default()
             .title("Mod list")
             .borders(Borders::ALL)
             .style(Style::default());
 
         ModList::new(self.root_config).block(list_block).render(
-            area,
+            chunks[1],
             buf,
             &mut self.mod_list_state,
         );
+
+        StatusBar.render(chunks[2], buf);
     }
 }
diff --git a/src/tui/instance.rs b/src/tui/instance.rs
new file mode 100644
index 0000000..8537ba8
--- /dev/null
+++ b/src/tui/instance.rs
@@ -0,0 +1,30 @@
+use ratatui::{
+    style::Style,
+    widgets::{Block, Borders, Paragraph, Widget},
+};
+
+pub struct InstanceSelect {
+    selected: Option<String>,
+}
+
+impl InstanceSelect {
+    pub fn new(selected: Option<String>) -> Self {
+        Self { selected }
+    }
+}
+
+impl Widget for InstanceSelect {
+    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
+    where
+        Self: Sized,
+    {
+        let list_block = Block::default()
+            .title("Instance")
+            .borders(Borders::ALL)
+            .style(Style::default());
+
+        Paragraph::new(self.selected.unwrap_or("None".to_owned()))
+            .block(list_block)
+            .render(area, buf);
+    }
+}
diff --git a/src/tui/status.rs b/src/tui/status.rs
new file mode 100644
index 0000000..383e268
--- /dev/null
+++ b/src/tui/status.rs
@@ -0,0 +1,12 @@
+use ratatui::{text::Line, widgets::Widget};
+
+pub struct StatusBar;
+
+impl Widget for StatusBar {
+    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
+    where
+        Self: Sized {
+
+        Line::from("Up Down Left right").render(area, buf);
+    }
+}