// Jackson Coxson

use clap::{Arg, Command};
use idevice::services::lockdown::LockdownClient;
use idevice::{IdeviceService, RsdService, core_device_proxy::CoreDeviceProxy, rsd::RsdHandshake};

mod common;

#[tokio::main]
async fn main() {
    env_logger::init();

    let matches = Command::new("process_control")
        .about("Query process control")
        .arg(
            Arg::new("host")
                .long("host")
                .value_name("HOST")
                .help("IP address of the device"),
        )
        .arg(
            Arg::new("pairing_file")
                .long("pairing-file")
                .value_name("PATH")
                .help("Path to the pairing file"),
        )
        .arg(
            Arg::new("udid")
                .value_name("UDID")
                .help("UDID of the device (overrides host/pairing file)")
                .index(2),
        )
        .arg(
            Arg::new("about")
                .long("about")
                .help("Show about information")
                .action(clap::ArgAction::SetTrue),
        )
        .arg(
            Arg::new("tunneld")
                .long("tunneld")
                .help("Use tunneld for connection")
                .action(clap::ArgAction::SetTrue),
        )
        .arg(
            Arg::new("bundle_id")
                .value_name("Bundle ID")
                .help("Bundle ID of the app to launch")
                .index(1),
        )
        .get_matches();

    if matches.get_flag("about") {
        println!("process_control - launch and manage processes on the device");
        println!("Copyright (c) 2025 Jackson Coxson");
        return;
    }

    let udid = matches.get_one::<String>("udid");
    let pairing_file = matches.get_one::<String>("pairing_file");
    let host = matches.get_one::<String>("host");
    let bundle_id = matches
        .get_one::<String>("bundle_id")
        .expect("No bundle ID specified");

    let provider =
        match common::get_provider(udid, host, pairing_file, "process_control-jkcoxson").await {
            Ok(p) => p,
            Err(e) => {
                eprintln!("{e}");
                return;
            }
        };

    let mut rs_client_opt: Option<
        idevice::dvt::remote_server::RemoteServerClient<Box<dyn idevice::ReadWrite>>,
    > = None;

    if let Ok(proxy) = CoreDeviceProxy::connect(&*provider).await {
        let rsd_port = proxy.handshake.server_rsd_port;
        let adapter = proxy.create_software_tunnel().expect("no software tunnel");
        let mut adapter = adapter.to_async_handle();
        let stream = adapter.connect(rsd_port).await.expect("no RSD connect");

        // Make the connection to RemoteXPC (iOS 17+)
        let mut handshake = RsdHandshake::new(stream).await.unwrap();
        let mut rs_client = idevice::dvt::remote_server::RemoteServerClient::connect_rsd(
            &mut adapter,
            &mut handshake,
        )
        .await
        .expect("no connect");
        rs_client.read_message(0).await.expect("no read??");
        rs_client_opt = Some(rs_client);
    }

    let mut rs_client = if let Some(c) = rs_client_opt {
        c
    } else {
        // Read iOS version to decide whether we can fallback to remoteserver
        let mut lockdown = LockdownClient::connect(&*provider)
            .await
            .expect("lockdown connect failed");
        lockdown
            .start_session(&provider.get_pairing_file().await.expect("pairing file"))
            .await
            .expect("lockdown start_session failed");
        let pv = lockdown
            .get_value(Some("ProductVersion"), None)
            .await
            .ok()
            .and_then(|v| v.as_string().map(|s| s.to_string()))
            .unwrap_or_default();
        let major: u32 = pv
            .split('.')
            .next()
            .and_then(|s| s.parse().ok())
            .unwrap_or(0);

        if major >= 17 {
            // iOS 17+ with no CoreDeviceProxy: do not attempt remoteserver (would return InvalidService)
            panic!("iOS {pv} detected and CoreDeviceProxy unavailable. RemoteXPC tunnel required.");
        }

        // iOS 16 and earlier: fallback to Lockdown remoteserver (or DVTSecureSocketProxy)
        idevice::dvt::remote_server::RemoteServerClient::connect(&*provider)
            .await
            .expect("failed to connect to Instruments Remote Server over Lockdown (iOS16-). Ensure Developer Disk Image is mounted.")
    };

    // Note: On both transports, protocol requires reading the initial message on root channel (0)
    rs_client.read_message(0).await.expect("no read??");
    let mut pc_client = idevice::dvt::process_control::ProcessControlClient::new(&mut rs_client)
        .await
        .unwrap();

    let pid = pc_client
        .launch_app(bundle_id, None, None, false, false)
        .await
        .expect("no launch??");
    pc_client
        .disable_memory_limit(pid)
        .await
        .expect("no disable??");
    println!("PID: {pid}");
}