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

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

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

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

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

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

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

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

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

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

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

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

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

#[cfg(test)]
mod test {
}