// file: kb-app-demo-desktop/src/main.rs
// version: 1

//! Binary entry point for the desktop demo application.

#![forbid(unsafe_code)]
#![deny(unreachable_pub)]
#![warn(missing_docs)]
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use fs2::FileExt; // rust-rules: trait-import

/// Starts the single desktop demo application instance.
#[tokio::main]
async fn main() -> std::process::ExitCode {
    let mut lock_path = std::env::temp_dir();
    lock_path.push("com_sasedev_kb_app_demo_desktop.lock");
    let lock_file = match std::fs::File::create(&lock_path) {
        std::result::Result::Ok(file) => file,
        std::result::Result::Err(error) => {
            eprintln!("cannot create application lock '{}': {error}", lock_path.display());
            return std::process::ExitCode::FAILURE;
        },
    };
    if let std::result::Result::Err(error) = lock_file.try_lock_exclusive() {
        if error.kind() == std::io::ErrorKind::WouldBlock {
            eprintln!("another kb-app-demo-desktop instance is already running");
            return std::process::ExitCode::FAILURE;
        }
        eprintln!("cannot acquire application lock '{}': {error}", lock_path.display());
        return std::process::ExitCode::FAILURE;
    }
    let _lock_file = lock_file;
    let run_result = kb_app_demo_desktop_lib::run();
    return match run_result {
        std::result::Result::Ok(()) => std::process::ExitCode::SUCCESS,
        std::result::Result::Err(error) => {
            eprintln!("application error: {error}");
            std::process::ExitCode::FAILURE
        },
    };
}