use std::sync::Arc;
use eframe::egui;

fn main() -> eframe::Result {
    eframe::run_native(
        "TextEdit Test",
        eframe::NativeOptions {
            viewport: egui::ViewportBuilder::default().with_inner_size(
                (640.0, 360.0)
            ),
            ..Default::default()
        },
        Box::new(|ctx| {
            init_fonts(&ctx.egui_ctx);
            Ok(Box::new(App::new()))
        })
    )
}

// replace this with the proper path of the font file that supports CJK characters.
const MAIN_FONT: &'static [u8] = include_bytes!("./NotoSansCJK-Regular.otf");

fn init_fonts(ctx: &egui::Context) {
    let mut fonts = egui::FontDefinitions::default();

    fonts.font_data.insert(
        "main-font".to_owned(),
        Arc::new(egui::FontData::from_static(MAIN_FONT))
    );

    let proportional = fonts.families.entry(egui::FontFamily::Proportional).or_default();
    proportional.insert(0, "main-font".to_owned());

    ctx.set_fonts(fonts);
}

pub struct App {
    text_content: String
}

impl App {
    pub fn new() -> Self {
        App { text_content: String::new() }
    }
}

impl eframe::App for App {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading("TextEdit");
            ui.text_edit_singleline(&mut self.text_content);
            egui::TextEdit::singleline(&mut self.text_content)
        });
    }
}