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use std::{
    fs::create_dir,
    path::{Path, PathBuf},
};

use chrono::{Date, Local};

use crate::errors::DiaryError;

pub fn month_folder(path_root: PathBuf, date: &Date<Local>) -> PathBuf {
    let month_folder = PathBuf::from(date.format("%Y-%m").to_string());
    [path_root, month_folder].iter().collect()
}

pub fn create_month_folder(path: &Path) -> Result<(), DiaryError> {
    if !path.exists() {
        match create_dir(&path) {
            Ok(_) => Ok(()),
            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
                Err(DiaryError::UnInitialised { source: Some(e) })
            }
            Err(e) => panic!("Unexpected IO error {}", e), // uncovered.
        }
    } else {
        Ok(())
    }
}