// (c) 2020-2022 ZeroTier, Inc. -- currently proprietary pending actual release and licensing. See LICENSE.md.

use std::sync::Arc;

use clap::{Arg, Command};

use zerotier_network_controller::database::Database;
use zerotier_network_controller::filedatabase::FileDatabase;
use zerotier_network_controller::Controller;

use zerotier_network_hypervisor::{VERSION_MAJOR, VERSION_MINOR, VERSION_REVISION};
use zerotier_utils::exitcode;
use zerotier_utils::tokio::runtime::Runtime;
use zerotier_vl1_service::VL1Service;

async fn run(database: Arc<dyn Database>, runtime: &Runtime) -> i32 {
    let handler = Controller::new(database.clone(), runtime.handle().clone()).await;
    if handler.is_err() {
        eprintln!("FATAL: error initializing handler: {}", handler.err().unwrap().to_string());
        exitcode::ERR_CONFIG
    } else {
        let handler = handler.unwrap();

        let svc = VL1Service::new(
            database.clone(),
            handler.clone(),
            handler.clone(),
            zerotier_vl1_service::VL1Settings::default(),
        );

        if svc.is_ok() {
            let svc = svc.unwrap();
            svc.node().init_default_roots();

            handler.start(&svc).await;

            zerotier_utils::wait_for_process_abort();
            println!("Terminate signal received, shutting down...");
            exitcode::OK
        } else {
            eprintln!("FATAL: error launching service: {}", svc.err().unwrap().to_string());
            exitcode::ERR_IOERR
        }
    }
}

fn main() {
    const REQUIRE_ONE_OF_ARGS: [&'static str; 2] = ["postgres", "filedb"];
    let global_args = Command::new("zerotier-controller")
        .arg(
            Arg::new("filedb")
                .short('f')
                .long("filedb")
                .takes_value(true)
                .forbid_empty_values(true)
                .value_name("path")
                .help(Some("Use filesystem database at path"))
                .required_unless_present_any(&REQUIRE_ONE_OF_ARGS),
        )
        .arg(
            Arg::new("postgres")
                .short('p')
                .long("postgres")
                .takes_value(true)
                .forbid_empty_values(true)
                .value_name("path")
                .help(Some("Connect to postgres with parameters in YAML file"))
                .required_unless_present_any(&REQUIRE_ONE_OF_ARGS),
        )
        .version(format!("{}.{}.{}", VERSION_MAJOR, VERSION_MINOR, VERSION_REVISION).as_str())
        .arg_required_else_help(true)
        .try_get_matches_from(std::env::args())
        .unwrap_or_else(|e| {
            let _ = e.print();
            std::process::exit(exitcode::ERR_USAGE);
        });

    if let Ok(tokio_runtime) = zerotier_utils::tokio::runtime::Builder::new_multi_thread().enable_all().build() {
        tokio_runtime.block_on(async {
            if let Some(filedb_base_path) = global_args.value_of("filedb") {
                let file_db = FileDatabase::new(tokio_runtime.handle().clone(), filedb_base_path).await;
                if file_db.is_err() {
                    eprintln!(
                        "FATAL: unable to open filesystem database at {}: {}",
                        filedb_base_path,
                        file_db.as_ref().err().unwrap().to_string()
                    );
                    std::process::exit(exitcode::ERR_IOERR)
                }
                std::process::exit(run(file_db.unwrap(), &tokio_runtime).await);
            } else {
                eprintln!("FATAL: no database type selected.");
                std::process::exit(exitcode::ERR_USAGE);
            };
        });
    } else {
        eprintln!("FATAL: can't start async runtime");
        std::process::exit(exitcode::ERR_IOERR)
    }
}