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

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

pub struct NpmInstall<'a, T: AsRef<Path>, C: CommandRunner> {
  target: T,
  command_runner: &'a C,
}

impl<'a, T: AsRef<Path>, C: CommandRunner> NpmInstall<'a, T, C> {
  pub fn new(target: T, command_runner: &'a C) -> Self {
    NpmInstall {
      target,
      command_runner,
    }
  }
}

impl<'a, T: AsRef<Path>, C: CommandRunner> fmt::Display for NpmInstall<'a, T, C> {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    write!(
      f,
      "npm install in {}",
      self.target.as_ref().to_str().unwrap()
    )
  }
}

impl<'a, T: AsRef<Path>, C: CommandRunner> Symbol for NpmInstall<'a, T, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.target.as_ref().exists() {
      return Ok(false);
    }
    let result = self.command_runner.run_with_args(
      "sh",
      args![
        "-c",
        format!("cd '{}' && npm ls", self.target.as_ref().to_str().unwrap()),
      ],
    )?;
    Ok(
      result.status.success()
        && !String::from_utf8(result.stdout)
          .unwrap()
          .contains("(empty)"),
    )
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self.command_runner.run_successfully(
      "sh",
      args![
        "-c",
        format!(
          "cd '{}' && npm install --production --unsafe-perm",
          self.target.as_ref().to_str().unwrap()
        ),
      ],
    )
  }

  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 {}