import AppKit
import Darwin

@main
@MainActor
enum TerebiBootstrap {
    static func main() {
        let app = Bundle.main.bundleURL
        if let error = FFmpegRuntime.error(for: app) {
            fail(error)
        }
        let payload = app.appendingPathComponent("Contents/Frameworks/libterebi-player.dylib")
        guard let library = dlopen(payload.path, RTLD_NOW | RTLD_LOCAL) else {
            let detail = dlerror().map { String(cString: $0) } ?? "The dynamic loader could not load the player."
            fail("Could not load the player: \(detail)\n\nPlayer library: \(payload.path)\nRebuild and reinstall terebi.")
        }
        guard let entry = dlsym(library, "terebi_app_main") else {
            fail("The player library is missing its application entry point. Rebuild and reinstall terebi.")
        }
        // Keep the declared app executable alive so LaunchServices retains its identity.
        typealias PlayerMain = @convention(c) () -> Void
        unsafeBitCast(entry, to: PlayerMain.self)()
    }

    private static func fail(_ message: String) -> Never {
        FileHandle.standardError.write(Data("terebi: \(message)\n".utf8))
        let application = NSApplication.shared
        application.setActivationPolicy(.regular)
        application.activate(ignoringOtherApps: true)
        let alert = NSAlert()
        alert.alertStyle = .critical
        alert.messageText = "terebi could not start"
        alert.informativeText = message
        alert.addButton(withTitle: "Quit")
        alert.runModal()
        exit(69)
    }
}