mod exercises;
mod inflection;
mod init;
mod locale;
mod nuke;
mod run;
mod words;

/// Version for this program.
const VERSION: &str = "0.1.0";

fn help() {
    println!("Self-assessment tool for language learning.\n");
    println!("usage: mihi [OPTIONS] [COMMAND] [COMMAND OPTIONS]\n");

    println!("Options:");
    println!("   -h, --help\t\tPrint this message.");
    println!("   -v, --version\tPrint the version of this program.\n");

    println!("Commands:");
    println!("   exercises\t\tManage the exercises for this application.");
    println!("   init\t\t\tInitialize the configuration for this application.");
    println!("   nuke\t\t\tRemove all files from this application and its database.");
    println!("   practice\t\tPractice vocabulary/exercises. Default command if none was given.");
    println!("   words\t\tManage the words for this application.");
}

fn main() {
    let mut args = std::env::args();
    let nargs = args.len();

    // Skip command name.
    args.next();

    match args.next() {
        Some(command_flag) => match command_flag.as_str() {
            "-h" | "--help" => {
                if nargs > 2 {
                    println!("warning: arguments passed the 'help' flag will be ignored.\n");
                }
                help();
                std::process::exit(0);
            }
            "-v" | "--version" => {
                if nargs > 2 {
                    println!("warning: arguments passed the 'version' flag will be ignored.\n");
                }
                println!("mihi {VERSION}");
                std::process::exit(0);
            }
            "init" => {
                let rest: Vec<String> = args.collect();
                init::run(rest);
            }
            "exercises" => {
                let rest: Vec<String> = args.collect();
                exercises::run(rest);
            }
            "nuke" => {
                let rest: Vec<String> = args.collect();
                nuke::run(rest);
            }
            "words" => {
                let rest: Vec<String> = args.collect();
                words::run(rest);
            }
            "practice" => {
                let rest: Vec<String> = args.collect();
                run::run(rest);
            }
            _ => {
                println!("error: unknown flag or command: '{command_flag}'");
                std::process::exit(1);
            }
        },
        None => run::run(Vec::new()),
    }
}