use anyhow::Result;
use clap::{crate_authors, crate_version, AppSettings, Parser};

mod posix;
mod sysv;

#[derive(Debug, Parser)]
enum Backend {
    /// Handle POSIX message queues
    #[clap(subcommand)]
    Posix(PosixCommand),
    /// Handle SysV message queues
    #[clap(subcommand)]
    Sysv(SysvCommand),
}

#[derive(Debug, Parser)]
enum PosixCommand {
    Create(posix::Create),
    Info(posix::Info),
    List(posix::List),
    Unlink(posix::Unlink),
    Send(posix::Send),
    Recv(posix::Recv),
}

#[derive(Debug, Parser)]
enum SysvCommand {
    Create(sysv::Create),
    Info(sysv::Info),
    List(sysv::List),
    Unlink(sysv::Unlink),
}

#[derive(Debug, Parser)]
#[clap(
    version = crate_version!(),
    author = crate_authors!(", "),
    setting = AppSettings::SubcommandRequiredElseHelp,
    global_setting = AppSettings::PropagateVersion,
    global_setting = AppSettings::InferSubcommands,
)]
struct Opts {
    /// Produce verbose output, multiple -v options increase the verbosity (max. 3)
    #[clap(short, long, global = true, parse(from_occurrences))]
    verbose: u32,
    /// Backend to be used
    #[clap(subcommand)]
    backend: Backend,
}

fn main() -> Result<()> {
    let opts: Opts = Opts::parse();

    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or(
        match opts.verbose {
            0 => "warn",
            1 => "info",
            2 => "debug",
            _ => "trace",
        },
    ))
    .init();

    match opts.backend {
        Backend::Posix(p) => match p {
            PosixCommand::Create(c) => c.run()?,
            PosixCommand::Info(i) => i.run()?,
            PosixCommand::List(l) => l.run()?,
            PosixCommand::Unlink(u) => u.run()?,
            PosixCommand::Send(s) => s.run()?,
            PosixCommand::Recv(r) => r.run()?,
        },
        Backend::Sysv(s) => match s {
            SysvCommand::Create(c) => c.run()?,
            SysvCommand::Info(i) => i.run()?,
            SysvCommand::List(l) => l.run()?,
            SysvCommand::Unlink(u) => u.run()?,
        },
    }

    Ok(())
}