SolarEnergy/custom_consumption/src/main.rs

use custom_consumption::app_config::AppConfig;
use custom_consumption::utils::time_millis;

fn main() {
    env_logger::init();

    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default().with_inner_size([220.0, 60.0]),
        ..Default::default()
    };
    eframe::run_native(
        "Custom consumption",
        options,
        Box::new(|_cc| Box::<MyApp>::default()),
    )
    .unwrap()
}

struct MyApp {
    consumption: i64,
    last_saved_consumption: i64,
    last_save_time: u128,
}

impl Default for MyApp {
    fn default() -> Self {
        let mut prev_consumption = 42;

        if AppConfig::get().file_path().is_file() {
            prev_consumption = std::fs::read_to_string(AppConfig::get().file_path())
                .unwrap_or("43".to_string())
                .parse()
                .unwrap_or(44)
        }

        Self {
            consumption: prev_consumption,
            last_saved_consumption: prev_consumption,
            last_save_time: time_millis(),
        }
    }
}

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        if self.consumption != self.last_saved_consumption
            && self.last_save_time + AppConfig::get().min_save_interval < time_millis()
        {
            log::info!("Persist {}", self.consumption);
            self.last_saved_consumption = self.consumption;
            self.last_save_time = time_millis();

            std::fs::write(AppConfig::get().file_path(), self.consumption.to_string())
                .expect("Failed to save value!");
        }

        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading("Custom consumption");
            ui.add(
                egui::Slider::new(
                    &mut self.consumption,
                    AppConfig::get().min..=AppConfig::get().max,
                )
                .text("W"),
            );
        });
    }
}