use std::borrow::Cow;
use std::error::Error;
use std::fmt;

use command_runner::CommandRunner;
use symbols::Symbol;

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

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

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

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

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

impl<'a> Symbol for TlsKey<'a> {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    let result = self.command_runner.run_with_args("openssl", &["rsa", "-in", &self.get_path(), "-noout", "-check", "-text"]);
    match result {
      Err(e) => Err(Box::new(e)),
      Ok(output) => match output.status.code() {
        Some(0) => Ok(output.stdout.starts_with(format!("Private-Key: ({} bit)\n", self.get_bytes()).as_bytes())),
        Some(_) => Ok(false),
        _ => Err("Didn't work".to_string().into())
      }
    }
  }

  fn execute(&self) -> Result<(), Box<Error>> {
    let output = self.command_runner.run_with_args("openssl", &["genrsa", "-out", &self.get_path(), &self.get_bytes().to_string()]);
    match output {
      Err(e) => Err(Box::new(e)),
      Ok(_) => Ok(())
    }
  }
}

#[cfg(test)]
mod test {
}