use linux_battery::Battery;

use std::fs::OpenOptions;
use std::io::Write;
use std::time::{Duration, SystemTime};
use std::thread::sleep;

fn main() {
    let mut battery = Battery::new("BAT0");
    let mut log_file = OpenOptions::new()
        .create(true)
        .append(true)
        .open("batman.log")
        .expect("can't open log file");

    loop {
        let sys_time = SystemTime::now();
        match sys_time.duration_since(SystemTime::UNIX_EPOCH) {
            Ok(n) => {
                let mut log_entry = format!("{}\t{}", n.as_secs(), battery.state());
                match battery.capacity() {
                    Some(cap) => log_entry = format!("{}\t{} %", log_entry, cap),
                    None => {},
                }
                log_entry = format!("{}\r\n", log_entry);
                log_file.write_all(log_entry.as_bytes()).expect("write to file failed");
            },
            Err(_) => {},
        }
        sleep(Duration::new(2, 0));
    }
}