use crate::symbols::Symbol;
use async_trait::async_trait;
use std::error::Error;
use std::fs;
use std::io;
use std::path::Path;

#[derive(Debug)]
pub struct Dir<P> {
  path: P,
}

impl<P> Dir<P> {
  pub fn new(path: P) -> Self {
    Self { path }
  }
}

#[async_trait(?Send)]
impl<P: AsRef<Path>> Symbol for Dir<P> {
  async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.path.as_ref().exists() {
      return Ok(false);
    }
    let metadata = fs::metadata(self.path.as_ref())?;
    if !metadata.is_dir() {
      return Err(Box::new(io::Error::new(
        io::ErrorKind::AlreadyExists,
        "Could not create a directory, non-directory file exists",
      )));
    }
    Ok(true)
  }

  async fn execute(&self) -> Result<(), Box<dyn Error>> {
    fs::create_dir(self.path.as_ref()).map_err(|e| Box::new(e) as Box<dyn Error>)
  }
}