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

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

pub struct AcmeAccountKey<'a, P: AsRef<Path>, C: CommandRunner> {
  path: P,
  command_runner: &'a C,
}

impl<'a, P: AsRef<Path>, C: CommandRunner> AcmeAccountKey<'a, P, C> {
  pub fn new(path: P, command_runner: &'a C) -> Self {
    AcmeAccountKey {
      path,
      command_runner,
    }
  }

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

impl<P: AsRef<Path>, C: CommandRunner> fmt::Display for AcmeAccountKey<'_, P, C> {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "AcmeAccountKey {}", self.path.as_ref().display())
  }
}

impl<P: AsRef<Path>, C: CommandRunner> Symbol for AcmeAccountKey<'_, P, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.path.as_ref().exists() {
      return Ok(false);
    }
    let stdout = self.command_runner.get_output(
      "openssl",
      args![
        "rsa",
        "-in",
        self.path.as_ref(),
        "-noout",
        "-check",
        "-text",
      ],
    )?;
    Ok(stdout.ends_with("RSA key ok\n".as_bytes()))
  }

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

  fn get_prerequisites(&self) -> Vec<Resource> {
    if let Some(parent) = self.path.as_ref().parent() {
      vec![Resource::new("dir", parent.to_str().unwrap())]
    } else {
      vec![]
    }
  }

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

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

#[cfg(test)]
mod test {}