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

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

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

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

  fn get_csr_path(&self) -> PathBuf {
    format!("/etc/ssl/local_certs/{}.csr", self.domain).into()
  }
}

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

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

    let output = self.command_runner.get_stderr(
      "openssl",
      &[
        OsStr::new("req"),
        "-in".as_ref(),
        self.get_csr_path().as_ref(),
        "-noout".as_ref(),
        "-verify".as_ref(),
      ],
    )?;
    Ok(output == b"verify OK\n")
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.command_runner.run_successfully(
      "openssl",
      &[
        OsStr::new("req"),
        "-new".as_ref(),
        "-sha256".as_ref(),
        "-key".as_ref(),
        self.get_key_path().as_ref(),
        "-out".as_ref(),
        self.get_csr_path().as_ref(),
        "-subj".as_ref(),
        format!("/CN={}", self.domain).as_ref(),
      ],
    )?;
    Ok(())
  }

  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 {}