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

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

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

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

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

impl<'a, C: CommandRunner> GitSubmodules<'a, C> {
  fn _run_in_target_repo(&self, args: &[&str]) -> Result<Vec<u8>, Box<dyn Error>> {
    let mut new_args = vec!["-C", self.target];
    new_args.extend_from_slice(args);
    self.command_runner.get_output("git", &new_args)
  }
}

impl<'a, C: CommandRunner> Symbol for GitSubmodules<'a, C> {
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !Path::new(self.target).exists() {
      return Ok(false);
    }
    let output = String::from_utf8(self._run_in_target_repo(&["submodule", "status"])?)?;
    Ok(
      output
        .lines()
        .all(|line| line.is_empty() || line.starts_with(' ')),
    )
  }

  fn execute(&self) -> Result<(), Box<dyn Error>> {
    self._run_in_target_repo(&["submodule", "update", "--init"])?;
    Ok(())
  }

  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 {}