use regex::Regex;
use schematics::storage::{SimpleStorage, Storage};
use std::fs::{create_dir, File};
use std::path::Path;
use tempfile::{tempdir, TempDir};

fn get_dir<'a, I: IntoIterator<Item = &'a &'a str>>(content: I) -> TempDir {
  let tmp_dir = tempdir().expect("create temp dir");
  let storage_path = tmp_dir.path().join("_filename");
  create_dir(storage_path.clone()).unwrap();
  for path in content {
    let file_path = storage_path.join(path);
    File::create(file_path).expect("create temp file");
  }
  tmp_dir
}

fn get_storage(path: &Path) -> SimpleStorage {
  SimpleStorage::new(path.join("_filename").into())
}

// Normal cases

#[test]
fn single_file() {
  let dir = get_dir(&["12345"]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert_eq!(
    dir.path().join("_filename").join("12345"),
    Path::new(&*storage.read_filename().unwrap())
  );
  assert_eq!(storage.recent_date().unwrap(), 12345);
}

#[test]
fn two_files() {
  let dir = get_dir(&["12345", "23456"]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert_eq!(
    dir.path().join("_filename").join("23456"),
    Path::new(&*storage.read_filename().unwrap())
  );
  assert_eq!(storage.recent_date().unwrap(), 23456);
}

#[test]
fn another_two_files() {
  let dir = get_dir(&["23456", "12345"]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert_eq!(
    dir.path().join("_filename").join("23456"),
    Path::new(&*storage.read_filename().unwrap())
  );
  assert_eq!(storage.recent_date().unwrap(), 23456);
}

#[test]
fn three_files() {
  let dir = get_dir(&["23456", "9", "12345"]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert_eq!(
    dir.path().join("_filename").join("23456"),
    Path::new(&*storage.read_filename().unwrap())
  );
  assert_eq!(storage.recent_date().unwrap(), 23456);
}

// Bad cases

#[test]
fn empty_storage() {
  let dir = tempdir().expect("create temp dir");
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert!(storage.read_filename().is_err());
  assert_eq!(
    storage.read_filename().unwrap_err().to_string(),
    "No such file or directory (os error 2)"
  );
  assert!(storage.recent_date().is_err());
  assert_eq!(
    storage.recent_date().unwrap_err().to_string(),
    "No such file or directory (os error 2)"
  );
}

#[test]
fn empty_storage_for_filename() {
  let dir = get_dir(&[]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert!(storage.read_filename().is_err());
  assert_eq!(
    storage.read_filename().unwrap_err().to_string(),
    "Not found"
  );
  assert!(storage.recent_date().is_err());
  assert_eq!(storage.recent_date().unwrap_err().to_string(), "Not found");
}

#[test]
fn bad_file() {
  let dir = get_dir(&["abba"]);
  let storage = get_storage(dir.path());

  assert!(
    Regex::new(&format!("^{}/_filename/\\d+$", dir.path().display()))
      .unwrap()
      .is_match(storage.write_filename().to_str().unwrap())
  );
  assert!(storage.read_filename().is_err());
  assert_eq!(
    storage.read_filename().unwrap_err().to_string(),
    "Not found"
  );
  assert!(storage.recent_date().is_err());
  assert_eq!(storage.recent_date().unwrap_err().to_string(), "Not found");
}