use std::borrow::{Borrow, Cow};
use std::error::Error;
use std::fmt;
use std::path::Path;

use command_runner::CommandRunner;
use resources::Resource;
use symbols::Symbol;

pub struct AcmeAccountKey<'a> {
  path: Cow<'a, str>,
  command_runner: &'a CommandRunner
}

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

  fn get_path(&self) -> &str {
    self.path.borrow()
  }

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

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

impl<'a> Symbol for AcmeAccountKey<'a> {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    if !Path::new(self.get_path()).exists() {
      return Ok(false);
    }
    let stdout = try!(self.command_runner.get_output("openssl", &["rsa", "-in", self.get_path(), "-noout", "-check", "-text"]));
    Ok(stdout.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 get_prerequisites(&self) -> Vec<Resource> {
    vec![ Resource::new("dir", Path::new(self.get_path()).parent().unwrap().to_string_lossy() ) ]
  }
}

#[cfg(test)]
mod test {
}