use std::error::Error;
use std::fmt;

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

pub struct ReloadService<'a, C: 'a + CommandRunner> {
  service: &'a str,
  command_runner: &'a C
}

impl<'a, C: CommandRunner> ReloadService<'a, C> {
  pub fn new(service: &'a str, command_runner: &'a C) -> Self {
    ReloadService {
      service: service,
      command_runner: command_runner
    }
  }
}

impl<'a, C: CommandRunner> Symbol for ReloadService<'a, C> {
  fn target_reached(&self) -> Result<bool, Box<Error>> {
    Ok(true)
  }

  fn execute(&self) -> Result<(), Box<Error>> {
    self.command_runner.run_successfully("systemctl", &["reload-or-restart", self.service])
  }

  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))
  }
}

impl<'a, C: CommandRunner> fmt::Display for ReloadService<'a, C> {
  fn fmt(&self, f: &mut fmt::Formatter) -> Result<(),fmt::Error>{
    write!(f, "Reload service {}", self.service)
  }
}