use std::borrow::Cow;
use std::path::{Path, PathBuf};

use crate::command_runner::CommandRunner;
use crate::command_runner::SetuidCommandRunner;
use crate::symbols::dir::Dir;
use crate::symbols::file::File;
use crate::symbols::list::List;
use crate::symbols::owner::Owner;
use crate::symbols::Symbol;

mod account_key;
mod cert;
mod chain;

pub use self::account_key::AcmeAccountKey;
pub use self::cert::AcmeCert;
pub use self::chain::AcmeCertChain;

const ROOT_CERT_FILE_NAME: &str = "lets_encrypt_x3_cross_signed.pem";
const ACCOUNT_KEY_FILE_NAME: &str = "account.key";

pub struct Factory<'a, U: AsRef<str>, H: AsRef<Path>, C: AsRef<str>, R: CommandRunner> {
  user_name: U,
  home_dir: H,
  cert: C,
  command_runner: &'a R,
  acme_command_runner: SetuidCommandRunner<'a, U, R>,
}

impl<'a, U: Clone + AsRef<str>, H: AsRef<Path>, C: AsRef<str>, R: CommandRunner>
  Factory<'a, U, H, C, R>
{
  pub fn new(user_name: U, home_dir: H, cert: C, command_runner: &'a R) -> Self {
    let acme_command_runner = SetuidCommandRunner::new(user_name.clone(), command_runner);
    Self {
      user_name,
      home_dir,
      cert,
      command_runner,
      acme_command_runner,
    }
  }
  pub fn get_challenges_dir(&'a self) -> Cow<Path> {
    [self.home_dir.as_ref(), "challenges".as_ref()]
      .iter()
      .collect::<PathBuf>()
      .into()
  }
  pub fn get_init(&'a self) -> impl Symbol + 'a {
    let root_cert_path: PathBuf = [self.home_dir.as_ref(), ROOT_CERT_FILE_NAME.as_ref()]
      .iter()
      .collect();
    let account_key_file: PathBuf = [self.home_dir.as_ref(), ACCOUNT_KEY_FILE_NAME.as_ref()]
      .iter()
      .collect();
    List::from((
      AcmeAccountKey::new(account_key_file.clone(), self.command_runner),
      Owner::new(
        account_key_file,
        self.user_name.clone(),
        self.command_runner,
      ),
      Dir::new(self.get_challenges_dir()),
      Owner::new(
        self.get_challenges_dir(),
        self.user_name.clone(),
        self.command_runner,
      ),
      Dir::new("/etc/ssl/local_certs"),
      Owner::new(
        "/etc/ssl/local_certs",
        self.user_name.clone(),
        self.command_runner,
      ),
      File::new(root_cert_path, self.cert.as_ref()),
    ))
  }
  pub fn get_cert<HOST: 'a + Clone + AsRef<str>>(&'a self, host: HOST) -> impl Symbol + 'a {
    let root_cert_path: PathBuf = [self.home_dir.as_ref(), ROOT_CERT_FILE_NAME.as_ref()]
      .iter()
      .collect();
    let account_key_path: PathBuf = [self.home_dir.as_ref(), ACCOUNT_KEY_FILE_NAME.as_ref()]
      .iter()
      .collect();
    List::from((
      AcmeCert::new(
        host.clone(),
        &self.acme_command_runner,
        root_cert_path.clone(),
        account_key_path,
        self.get_challenges_dir(),
      ),
      AcmeCertChain::new(host, &self.acme_command_runner, root_cert_path),
    ))
  }
}