use lv_tui::prelude::*;
use lv_tui::text::Text;
use lv_tui::widgets::*;

struct App {
    content: Column,
}

impl App {
    fn new() -> Self {
        Self {
            content: Column::new()
                .child(Label::new("选择语言:"))
                .child(
                    Select::new()
                        .options(vec![
                            Text::from("Rust"),
                            Text::from("TypeScript"),
                            Text::from("Python"),
                            Text::from("Go"),
                            Text::from("Zig"),
                        ])
                        .selected_style(Style::default().bg(Color::White).fg(Color::Black)),
                )
                .child(Label::new("按 Enter 展开选项  ↑↓ 导航  q 退出")),
        }
    }
}

impl Component for App {
    fn render(&self, cx: &mut RenderCx) { self.content.render(cx); }
    fn event(&mut self, e: &Event, cx: &mut EventCx) {
        if e.is_key(Key::Char('q')) { cx.quit(); return; }
        if let Event::Key(k) = e {
            if k.key == Key::Char('c') && k.modifiers.ctrl { cx.quit(); return; }
        }
        self.content.event(e, cx);
    }
    fn layout(&mut self, r: lv_tui::geom::Rect, cx: &mut lv_tui::component::LayoutCx) { self.content.layout(r, cx); }
    fn measure(&self, c: lv_tui::layout::Constraint, _cx: &mut lv_tui::component::MeasureCx) -> lv_tui::geom::Size {
        lv_tui::geom::Size { width: c.max.width, height: c.max.height }
    }
    fn focusable(&self) -> bool { false }
}

fn main() -> lv_tui::Result<()> {
    lv_tui::app::App::new(App::new()).run()
}
