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

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

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

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

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

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

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

const DAYS_IN_SECONDS: u32 = 24*60*60;

impl<'a> Symbol for SelfSignedTlsCert<'a> {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    let result = self.command_runner.run_with_args("openssl", &["x509", "-in", &self.get_cert_path(), "-noout", "-subject", "-checkend", &(30*DAYS_IN_SECONDS).to_string()]);
    match result {
      Err(e) => Err(Box::new(e)),
      Ok(output) => match output.status.code() {
        Some(0) => Ok(output.stdout == format!("subject=CN = {}\nCertificate will not expire\n", self.domain).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", &["req", "-x509", "-sha256", "-days", "90", "-key", &self.get_key_path(), "-out", &self.get_cert_path(), "-subj", &format!("/CN={}", self.domain)]);
    match output {
      Err(e) => Err(Box::new(e)),
      Ok(_) => Ok(())
    }
  }
}

#[cfg(test)]
mod test {
}