use std::borrow::Cow;
use std::error::Error;
use std::ffi::OsStr;
use std::fmt;
use std::path::PathBuf;

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

pub struct TlsKey<'a, C: CommandRunner> {
  domain: Cow<'a, str>,
  command_runner: &'a C,
}

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

  fn get_path(&self) -> PathBuf {
    ["/etc/ssl/private", &format!("{}.key", self.domain)]
      .iter()
      .collect()
  }

  fn get_bytes(&self) -> u32 {
    4096
  }
}

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

impl<C: CommandRunner> Symbol for TlsKey<'_, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.get_path().exists() {
      return Ok(false);
    }

    let stdout = self.command_runner.get_output(
      "openssl",
      &[
        OsStr::new("rsa"),
        "-in".as_ref(),
        self.get_path().as_ref(),
        "-noout".as_ref(),
        "-check".as_ref(),
        "-text".as_ref(),
      ],
    )?;
    Ok(stdout.ends_with("RSA key ok\n".as_bytes()))
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.command_runner.run_successfully(
      "openssl",
      &[
        OsStr::new("genrsa"),
        "-out".as_ref(),
        self.get_path().as_ref(),
        self.get_bytes().to_string().as_ref(),
      ],
    )
  }

  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 {}