use crate::command_runner::CommandRunner;
use crate::symbols::Symbol;
use async_trait::async_trait;
use std::borrow::Borrow;
use std::error::Error;
use std::fs::File as FsFile;
use std::io::Write;
use std::marker::PhantomData;
use std::path::Path;

#[derive(Debug)]
pub struct Cert<_C, C, D, P> {
  domain: D,
  command_runner: C,
  root_cert_path: P,
  account_key_path: P,
  challenges_path: P,
  csr_path: P,
  cert_path: P,
  phantom: PhantomData<_C>,
}

impl<_C, C, D, P> Cert<_C, C, D, P> {
  pub fn new(
    domain: D,
    command_runner: C,
    root_cert_path: P,
    account_key_path: P,
    challenges_path: P,
    csr_path: P,
    cert_path: P,
  ) -> Self {
    Self {
      domain,
      command_runner,
      root_cert_path,
      account_key_path,
      challenges_path,
      csr_path,
      cert_path,
      phantom: PhantomData::default(),
    }
  }
}

const DAYS_IN_SECONDS: u32 = 24 * 60 * 60;

#[async_trait(?Send)]
impl<_C: CommandRunner, C: Borrow<_C>, D: AsRef<str>, P: AsRef<Path>> Symbol for Cert<_C, C, D, P> {
  async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.cert_path.as_ref().exists() {
      return Ok(false);
    }

    let output = self
      .command_runner
      .borrow()
      .run_with_args(
        "openssl",
        args![
          "x509",
          "-in",
          self.cert_path.as_ref(),
          "-noout",
          "-subject",
          "-checkend",
          (30 * DAYS_IN_SECONDS).to_string(),
        ],
      )
      .await?;
    if output.status.success()
      && output.stdout
        == format!(
          "subject=CN = {}\nCertificate will not expire\n",
          self.domain.as_ref()
        )
        .as_bytes()
    {
      Ok(
        self
          .command_runner
          .borrow()
          .run_successfully(
            "openssl",
            args![
              "verify",
              "--untrusted",
              self.root_cert_path.as_ref(),
              self.cert_path.as_ref(),
            ],
          )
          .await
          .is_ok(),
      )
    } else if output.status.code() == Some(1)
      && output.stdout
        == format!(
          "subject=CN = {}\nCertificate will expire\n",
          self.domain.as_ref()
        )
        .as_bytes()
    {
      Ok(false)
    } else {
      Err(String::from_utf8(output.stderr)?.into())
    }
  }

  async fn execute(&self) -> Result<(), Box<dyn Error>> {
    let output = self
      .command_runner
      .borrow()
      .get_output(
        "acme-tiny",
        args![
          "--account-key",
          self.account_key_path.as_ref(),
          "--csr",
          self.csr_path.as_ref(),
          "--acme-dir",
          self.challenges_path.as_ref(),
        ],
      )
      .await?;
    let mut file = FsFile::create(self.cert_path.as_ref())?;
    file.write_all(&output)?;
    Ok(())
  }
}

#[cfg(test)]
mod test {}