use std::collections::HashMap;
use std::fs;
use std::fs::{File, OpenOptions};
use std::io;
use std::io::Result;
use std::path::PathBuf;

pub struct Logger {
    log_dir: PathBuf,
    fds: HashMap<String, File>,
}

impl Logger {
    fn get_file(&mut self, target: &str) -> Result<&mut File> {
        if !self.fds.contains_key(target) {
            let mut file_path = self.log_dir.clone();
            file_path.push(&format!("{}.txt", target));
            let fd = OpenOptions::new().append(true).open(file_path)?;
            self.fds.insert(target.to_owned(), fd);
        }
        Ok(self.fds.get_mut(target).unwrap())
    }
}