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

use crate::config::Config;
use crate::error::*;

static DIRS: &[&str] = &[
	"bin", "dev", "etc", "home", "lib", "lib64", "proc", "root", "run", "sbin", "sys", "tmp",
	"usr", "var", "usr/bin",
];

pub fn check(config: &Config) -> MkrootResult<()> {
	if !&config.root_dir.exists() {
		return Ok(());
	}

	open(&config.root_dir, config.verbose)?;

	for dir in DIRS {
		let mut d = PathBuf::from(&config.root_dir);
		d.push(&dir);
		open(&d, config.verbose)?;
	}

	Ok(())
}

fn open(dir: &PathBuf, verbose: bool) -> MkrootResult<()> {
	if dir.exists() {
		if verbose {
			println!("Checking directory {}", &dir.display());
		}
		if let Err(e) = read_dir(&dir) {
			return Err(MkrootError::from(format!(
				"Error opening directory {}: {}",
				&dir.display(),
				e
			)));
		}
	}

	Ok(())
}

pub fn create(config: &Config) -> MkrootResult<()> {
	mkdir(&config.root_dir, config.verbose)?;

	for dir in DIRS {
		let mut d = PathBuf::from(&config.root_dir);
		d.push(&dir);
		mkdir(&d, config.verbose)?;
	}

	Ok(())
}

fn mkdir(dir: &PathBuf, verbose: bool) -> MkrootResult<()> {
	if !dir.exists() {
		if verbose {
			println!("Creating directory {}", &dir.display());
		}
		if let Err(e) = create_dir(&dir) {
			return Err(MkrootError::from(format!(
				"Error creating directory {}: {}",
				&dir.display(),
				e
			)));
		}
	}

	Ok(())
}