use std::error::Error;
use std::fmt;
use std::path::PathBuf;

use crate::command_runner::CommandRunner;
use crate::resources::Resource;
use crate::symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction, SymbolRunner};

pub struct SelfSignedTlsCert<'a, D: AsRef<str>, C: CommandRunner> {
  domain: D,
  command_runner: &'a C,
}

impl<'a, D: AsRef<str>, C: CommandRunner> SelfSignedTlsCert<'a, D, C> {
  pub fn new(domain: D, command_runner: &'a C) -> Self {
    SelfSignedTlsCert {
      domain,
      command_runner,
    }
  }

  fn get_key_path(&self) -> PathBuf {
    format!("/etc/ssl/private/{}.key", self.domain.as_ref()).into()
  }

  fn get_cert_path(&self) -> PathBuf {
    format!("/etc/ssl/local_certs/{}.chained.crt", self.domain.as_ref()).into()
  }
}

impl<D: AsRef<str>, C: CommandRunner> fmt::Display for SelfSignedTlsCert<'_, D, C> {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "SelfSignedTlsCert {}", self.domain.as_ref())
  }
}

const DAYS_IN_SECONDS: u32 = 24 * 60 * 60;

impl<D: AsRef<str>, C: CommandRunner> Symbol for SelfSignedTlsCert<'_, D, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.get_cert_path().exists() {
      return Ok(false);
    }
    let output = self.command_runner.run_with_args(
      "openssl",
      args![
        "x509",
        "-in",
        self.get_cert_path(),
        "-noout",
        "-subject",
        "-checkend",
        (30 * DAYS_IN_SECONDS).to_string(),
      ],
    )?;
    println!("{}", output.status.code().unwrap());
    match output.status.code() {
      Some(0) => Ok(
        output.stdout
          == format!(
            "subject=CN = {}\nCertificate will not expire\n",
            self.domain.as_ref()
          )
          .as_bytes(),
      ),
      Some(_) => {
        if output.stdout
          == format!(
            "subject=CN = {}\nCertificate will expire\n",
            self.domain.as_ref()
          )
          .as_bytes()
        {
          Ok(false)
        } else {
          Err("Exit code non-zero, but wrong stdout".to_string().into())
        }
      }
      _ => Err("Apparently killed by signal".to_string().into()),
    }
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.command_runner.run_successfully(
      "openssl",
      args![
        "req",
        "-x509",
        "-sha256",
        "-days",
        "90",
        "-key",
        self.get_key_path(),
        "-out",
        self.get_cert_path(),
        "-subj",
        format!("/CN={}", self.domain.as_ref()),
      ],
    )
  }

  fn get_prerequisites(&self) -> Vec<Resource> {
    vec![Resource::new("file", self.get_key_path().to_str().unwrap())]
  }

  fn as_action<'b>(&'b self, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b> {
    Box::new(SymbolAction::new(runner, self))
  }

  fn into_action<'b>(self: Box<Self>, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b>
  where
    Self: 'b,
  {
    Box::new(OwnedSymbolAction::new(runner, *self))
  }
}

#[cfg(test)]
mod test {}