use schematics::async_utils::run;
use schematics::symbols::file::File as FileSymbol;
use schematics::symbols::Symbol;
use std::fs::File;
use std::io::Write;
use std::path::{Path, PathBuf};
use tempfile::{tempdir, TempDir};

fn get_dir(content: Option<&str>) -> TempDir {
  let tmp_dir = tempdir().expect("create temp dir");
  if content.is_none() {
    return tmp_dir;
  }
  let file_path = tmp_dir.path().join("filename");
  let mut tmp_file = File::create(file_path).expect("create temp file");
  tmp_file
    .write_all(content.unwrap().as_bytes())
    .expect("write temp file");
  tmp_dir
}

fn get_symbol(path: &Path) -> FileSymbol<PathBuf, &str> {
  FileSymbol::new(path.join("filename"), "target content")
}

// Normal cases

// Good
#[test]
fn already_reached() {
  let dir = get_dir(Some("target content"));
  let symbol = get_symbol(dir.path());

  run(async {
    assert_eq!(symbol.target_reached().await.unwrap(), true);
  })
}

// Bad
#[test]
fn wrong_prefix() {
  let dir = get_dir(Some("not target content"));
  let symbol = get_symbol(dir.path());

  run(async {
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    symbol.execute().await.unwrap();
    assert_eq!(symbol.target_reached().await.unwrap(), true);
  })
}

#[test]
fn wrong_postfix() {
  let dir = get_dir(Some("target content not"));
  let symbol = get_symbol(dir.path());

  run(async {
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    symbol.execute().await.unwrap();
    assert_eq!(symbol.target_reached().await.unwrap(), true);
  })
}

#[test]
fn empty_file() {
  let dir = get_dir(Some(""));
  let symbol = get_symbol(dir.path());

  run(async {
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    symbol.execute().await.unwrap();
    assert_eq!(symbol.target_reached().await.unwrap(), true);
  })
}

#[test]
fn no_file() {
  let dir = get_dir(None);
  let symbol = get_symbol(dir.path());

  run(async {
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    symbol.execute().await.unwrap();
    assert_eq!(symbol.target_reached().await.unwrap(), true);
  })
}

// Exceptional cases

#[test]
fn may_not_read_file() {
  let symbol = FileSymbol::new(Path::new("/etc/shadow"), "");

  run(async {
    assert_eq!(symbol.target_reached().await.is_err(), true);
  })
}

#[test]
fn may_not_create_file() {
  let symbol = get_symbol(Path::new("/proc/somefile"));

  run(async {
    // Could also return an error
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    assert!(symbol.execute().await.is_err());
  })
}

#[test]
fn directory_missing() {
  let symbol = get_symbol(Path::new("/nonexisting"));

  run(async {
    // Could also return an error
    assert_eq!(symbol.target_reached().await.unwrap(), false);
    assert!(symbol.execute().await.is_err());
  })
}