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use clap::Parser;
use rustutils_runnable::Runnable;
use std::error::Error;
use std::process::ExitCode;
mod macros;

// By using some macro magic, this will import all of the parsers
// publically, and declare a `Coreutil` enum that has cases for every
// single utility listed here, and define some helpful functions that
// enable the rest of this code.
macros::declare_utility! {
    "arch" => rustutils_arch::Arch as Arch,
    "cat" => rustutils_cat::Cat as Cat,
    "false" => rustutils_false::False as False,
    "pwd" => rustutils_pwd::Pwd as Pwd,
    "rmdir" => rustutils_rmdir::Rmdir as Rmdir,
    "seq" => rustutils_seq::Seq as Seq,
    "sleep" => rustutils_sleep::Sleep as Sleep,
    "tee" => rustutils_tee::Tee as Tee,
    "true" => rustutils_true::True as True,
    "uname" => rustutils_uname::Uname as Uname,
    "unlink" => rustutils_unlink::Unlink as Unlink,
    "wc" => rustutils_wc::Wc as Wc,
    "yes" => rustutils_yes::Yes as Yes,
    "dirname" => rustutils_dirname::Dirname as Dirname,
    "basename" => rustutils_basename::Basename as Basename,
    "mkdir" => rustutils_mkdir::Mkdir as Mkdir,
    "env" => rustutils_env::Env as Env,
    "printenv" => rustutils_printenv::Printenv as Printenv,
    "base64" => rustutils_base64::Base64 as Base64
}

#[derive(Parser, Clone, Debug)]
#[clap(author, version, about, long_about = None)]
pub struct Coreutils {
    #[clap(subcommand)]
    util: Coreutil,
}

impl Runnable for Coreutils {
    fn run(&self) -> Result<(), Box<dyn Error>> {
        self.util.runnable().run()
    }

    fn main(&self) -> ExitCode {
        self.util.runnable().main()
    }
}

pub fn multicall_parse() -> Result<Option<Coreutil>, Box<dyn Error>> {
    let executable = std::env::current_exe()?;
    let file = executable.file_stem().and_then(|s| s.to_str());
    let result = file.and_then(|name| Coreutil::parse(name));
    Ok(result)
}

pub fn main() -> ExitCode {
    if cfg!(feature = "multicall") {
        match multicall_parse() {
            Ok(Some(utility)) => utility.runnable().main(),
            Ok(None) => Coreutils::parse().main(),
            Err(error) => {
                eprintln!("Error parsing multicall: {error}");
                ExitCode::FAILURE
            }
        }
    } else {
        Coreutils::parse().main()
    }
}