From dc45b960a4eda299058e597f6867e4d4be109b1b Mon Sep 17 00:00:00 2001
From: lukeflo
Date: Fri, 20 Sep 2024 22:31:33 +0200
Subject: initial commit

---
 src/frontend/tui.rs | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/frontend/tui.rs

(limited to 'src/frontend/tui.rs')

diff --git a/src/frontend/tui.rs b/src/frontend/tui.rs
new file mode 100644
index 0000000..94db9ea
--- /dev/null
+++ b/src/frontend/tui.rs
@@ -0,0 +1,77 @@
+use crate::frontend::app::{App, AppResult};
+use crate::frontend::event::EventHandler;
+use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
+use crossterm::terminal::{self, EnterAlternateScreen, LeaveAlternateScreen};
+use ratatui::backend::Backend;
+use ratatui::Terminal;
+use std::io;
+use std::panic;
+
+/// Representation of a terminal user interface.
+///
+/// It is responsible for setting up the terminal,
+/// initializing the interface and handling the draw events.
+#[derive(Debug)]
+pub struct Tui<B: Backend> {
+    /// Interface to the Terminal.
+    terminal: Terminal<B>,
+    /// Terminal event handler.
+    pub events: EventHandler,
+}
+
+impl<B: Backend> Tui<B> {
+    /// Constructs a new instance of [`Tui`].
+    pub fn new(terminal: Terminal<B>, events: EventHandler) -> Self {
+        Self { terminal, events }
+    }
+
+    /// Initializes the terminal interface.
+    ///
+    /// It enables the raw mode and sets terminal properties.
+    pub fn init(&mut self) -> AppResult<()> {
+        terminal::enable_raw_mode()?;
+        crossterm::execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
+
+        // Define a custom panic hook to reset the terminal properties.
+        // This way, you won't have your terminal messed up if an unexpected error happens.
+        let panic_hook = panic::take_hook();
+        panic::set_hook(Box::new(move |panic| {
+            Self::reset().expect("failed to reset the terminal");
+            panic_hook(panic);
+        }));
+
+        self.terminal.hide_cursor()?;
+        self.terminal.clear()?;
+        Ok(())
+    }
+
+    /// [`Draw`] the terminal interface by [`rendering`] the widgets.
+    ///
+    /// [`Draw`]: ratatui::Terminal::draw
+    /// [`rendering`]: crate::ui::render
+    pub fn draw(&mut self, app: &mut App) -> AppResult<()> {
+        // self.terminal.draw(|frame| ui::render(app, frame))?;
+        self.terminal
+            .draw(|frame| frame.render_widget(app, frame.area()))?;
+        Ok(())
+    }
+
+    /// Resets the terminal interface.
+    ///
+    /// This function is also used for the panic hook to revert
+    /// the terminal properties if unexpected errors occur.
+    fn reset() -> AppResult<()> {
+        terminal::disable_raw_mode()?;
+        crossterm::execute!(io::stdout(), LeaveAlternateScreen, DisableMouseCapture)?;
+        Ok(())
+    }
+
+    /// Exits the terminal interface.
+    ///
+    /// It disables the raw mode and reverts back the terminal properties.
+    pub fn exit(&mut self) -> AppResult<()> {
+        Self::reset()?;
+        self.terminal.show_cursor()?;
+        Ok(())
+    }
+}
-- 
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