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

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

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

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

    let output = try!(self.command_runner.get_output("openssl", &["rsa", "-in", &self.get_path(), "-noout", "-check", "-text"]));
    Ok(output.starts_with(&format!("Private-Key: ({} bit)\n", self.get_bytes()).as_bytes()))
  }

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

  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 {
}