use clap::App;

use clap::AppSettings;

use clap::SubCommand;

mod commands;

mod error;

mod exitcode;

mod ui;

use commands::Command;

fn main() {

    let mut app = App::new("rhg")

        .setting(AppSettings::AllowInvalidUtf8)

        .setting(AppSettings::SubcommandRequired)

        .setting(AppSettings::VersionlessSubcommands)

        .version("0.0.1")

        .subcommand(

            SubCommand::with_name("root").about(commands::root::HELP_TEXT),

        );

    let matches = app.clone().get_matches_safe().unwrap_or_else(|_| {

        std::process::exit(exitcode::UNIMPLEMENTED_COMMAND)

    });

    let ui = ui::Ui::new();

    let command_result = match matches.subcommand_name() {

        Some(name) => match name {

            "root" => commands::root::RootCommand::new(&ui).run(),

            _ => std::process::exit(exitcode::UNIMPLEMENTED_COMMAND),

        },

        _ => {

            match app.print_help() {

                Ok(_) => std::process::exit(exitcode::OK),

                Err(_) => std::process::exit(exitcode::ABORT),

            };

        }

    };

    match command_result {

        Ok(_) => std::process::exit(exitcode::OK),

        Err(e) => {

            let message = e.get_error_message_bytes();

            if let Some(msg) = message {

                match ui.write_stderr(&msg) {

                    Ok(_) => (),

                    Err(_) => std::process::exit(exitcode::ABORT),

                };

            };

            e.exit()

        }

    }

}