use std::{io, io::Write, process};
use thiserror::Error;

mod git;
mod parser;

use parser::Command;

fn prompt() -> Result<(), ShackleError> {
    print!("> ");
    io::stdout().flush()?;
    Ok(())
}

fn read_stdin() -> Result<String, ShackleError> {
    let mut buffer = String::new();
    io::stdin().read_line(&mut buffer)?;
    Ok(buffer)
}

fn main() -> Result<(), ShackleError> {
    loop {
        prompt()?;
        let user_input = read_stdin()?;

        match user_input.parse::<Command>() {
            Err(unknown_input) => {
                println!("Unknown input \"{}\"", unknown_input);
            }
            Ok(Command::Whitespace) => {}
            Ok(Command::Exit) => {
                break;
            }
            Ok(Command::GitInit(repo_name)) => {
                git::init(&repo_name)?; // TODO should report this error differently
                println!("Successfully created {}.git", repo_name);
            }
            Ok(Command::GitUploadPack(git_dir)) => {
                process::Command::new("git")
                    .args(["upload-pack", &git_dir])
                    .spawn()?
                    .wait()?;
            }
            Ok(Command::GitReceivePack(git_dir)) => {
                process::Command::new("git")
                    .args(["receive-pack", &git_dir])
                    .spawn()?
                    .wait()?;
            }
        }
    }
    Ok(())
}

#[derive(Error, Debug)]
pub enum ShackleError {
    #[error(transparent)]
    IoError(#[from] io::Error),
    #[error(transparent)]
    GitError(#[from] git2::Error),
}